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Measurement of the $p \bar{p} \to W Z + X$ cross section at $\sqrt{s} = 1.96 TeV$ and limits on $W W Z$ trilinear gauge couplings

V. M. Abazov³⁵, B. Abbott⁷⁵, M. Abolins⁶⁵, B. S. Acharya²⁸, M. Adams⁵¹, T. Adams⁴⁹, E. Aguilo⁵, S. H. Ahn³⁰, M. Ahsan⁵⁹ et al. (D0 Collaboration)

M. Ahsan⁵⁹, G. D. Alexeev³⁵, G. Alkhazov³⁹, A. Alton^64,*, G. Alverson⁶³, G. A. Alves², M. Anastasoaie³⁴, L. S. Ancu³⁴, T. Andeen⁵³, S. Anderson⁴⁵, B. Andrieu¹⁶, M. S. Anzelc⁵³, Y. Arnoud¹³, M. Arov⁶⁰, M. Arthaud¹⁷, A. Askew⁴⁹, B. Åsman⁴⁰, A. C. S. Assis Jesus³, O. Atramentov⁴⁹, C. Autermann²⁰, C. Avila⁷, C. Ay²³, F. Badaud¹², A. Baden⁶¹, L. Bagby⁵², B. Baldin⁵⁰, D. V. Bandurin⁵⁹, S. Banerjee²⁸, P. Banerjee²⁸, E. Barberis⁶³, A.-F. Barfuss¹⁴, P. Bargassa⁸⁰, P. Baringer⁵⁸, J. Barreto², J. F. Bartlett⁵⁰, U. Bassler¹⁶, D. Bauer⁴³, S. Beale⁵, A. Bean⁵⁸, M. Begalli³, M. Begel⁷¹, C. Belanger-Champagne⁴⁰, L. Bellantoni⁵⁰, A. Bellavance⁵⁰, J. A. Benitez⁶⁵, S. B. Beri²⁶, G. Bernardi¹⁶, R. Bernhard²², L. Berntzon¹⁴, I. Bertram⁴², M. Besançon¹⁷, R. Beuselinck⁴³, V. A. Bezzubov³⁸, P. C. Bhat⁵⁰, V. Bhatnagar²⁶, C. Biscarat¹⁹, G. Blazey⁵², F. Blekman⁴³, S. Blessing⁴⁹, D. Bloch¹⁸, K. Bloom⁶⁷, A. Boehnlein⁵⁰, D. Boline⁶², T. A. Bolton⁵⁹, G. Borissov⁴², T. Bose⁷⁷, A. Brandt⁷⁸, R. Brock⁶⁵, G. 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Duggan⁴⁹, A. Duperrin¹⁴, J. Dyer⁶⁵, A. Dyshkant⁵², M. Eads⁶⁷, D. Edmunds⁶⁵, J. Ellison⁴⁸, V. D. Elvira⁵⁰, Y. Enari⁷⁷, S. Eno⁶¹, P. Ermolov³⁷, H. Evans⁵⁴, A. Evdokimov⁷³, V. N. Evdokimov³⁸, A. V. Ferapontov⁵⁹, T. Ferbel⁷¹, F. Fiedler²⁴, F. Filthaut³⁴, W. Fisher⁵⁰, H. E. Fisk⁵⁰, M. Ford⁴⁴, M. Fortner⁵², H. Fox²², S. Fu⁵⁰, S. Fuess⁵⁰, T. Gadfort⁸², C. F. Galea³⁴, E. Gallas⁵⁰, E. Galyaev⁵⁵, C. Garcia⁷¹, A. Garcia-Bellido⁸², V. Gavrilov³⁶, P. Gay¹², W. Geist¹⁸, D. Gelé¹⁸, C. E. Gerber⁵¹, Y. Gershtein⁴⁹, D. Gillberg⁵, G. Ginther⁷¹, N. Gollub⁴⁰, B. Gómez⁷, A. Goussiou⁵⁵, P. D. Grannis⁷², H. Greenlee⁵⁰, Z. D. Greenwood⁶⁰, E. M. Gregores⁴, G. Grenier¹⁹, Ph. Gris¹², J.-F. Grivaz¹⁵, A. Grohsjean²⁴, S. Grünendahl⁵⁰, M. W. Grünewald²⁹, J. Guo⁷², F. Guo⁷², P. Gutierrez⁷⁵, G. Gutierrez⁵⁰, A. Haas⁷⁰, N. J. Hadley⁶¹, P. Haefner²⁴, S. Hagopian⁴⁹, J. Haley⁶⁸, I. Hall⁶⁵, R. E. Hall⁴⁷, L. Han⁶, K. Hanagaki⁵⁰, P. Hansson⁴⁰, K. Harder⁴⁴, A. Harel⁷¹, R. Harrington⁶³, J. M. Hauptman⁵⁷, R. Hauser⁶⁵, J. Hays⁴³, T. Hebbeker²⁰, D. Hedin⁵², J. G. Hegeman³³, J. M. Heinmiller⁵¹, A. P. Heinson⁴⁸, U. Heintz⁶², C. Hensel⁵⁸, K. Herner⁷², G. Hesketh⁶³, M. D. Hildreth⁵⁵, R. Hirosky⁸¹, J. D. Hobbs⁷², B. Hoeneisen¹¹, H. Hoeth²⁵, M. Hohlfeld²¹, S. J. Hong³⁰, S. Hossain⁷⁵, P. Houben³³, Y. Hu⁷², Z. Hubacek⁹, V. Hynek⁸, I. Iashvili⁶⁹, R. Illingworth⁵⁰, A. S. Ito⁵⁰, S. Jabeen⁶², M. Jaffré¹⁵, S. Jain⁷⁵, K. Jakobs²², C. Jarvis⁶¹, R. Jesik⁴³, K. Johns⁴⁵, C. Johnson⁷⁰, M. Johnson⁵⁰, A. Jonckheere⁵⁰, P. Jonsson⁴³, A. Juste⁵⁰, D. Käfer²⁰, S. Kahn⁷³, E. Kajfasz¹⁴, A. M. Kalinin³⁵, J. R. Kalk⁶⁵, J. M. Kalk⁶⁰, S. Kappler²⁰, D. Karmanov³⁷, J. Kasper⁶², P. Kasper⁵⁰, I. Katsanos⁷⁰, D. Kau⁴⁹, R. Kaur²⁶, V. Kaushik⁷⁸, R. Kehoe⁷⁹, S. Kermiche¹⁴, N. Khalatyan³⁸, A. Khanov⁷⁶, A. Kharchilava⁶⁹, Y. M. Kharzheev³⁵, D. Khatidze⁷⁰, H. Kim³¹, T. J. Kim³⁰, M. H. Kirby³⁴, M. Kirsch²⁰, B. Klima⁵⁰, J. M. Kohli²⁶, J.-P. Konrath²², M. Kopal⁷⁵, V. M. Korablev³⁸, A. V. Kozelov³⁸, D. Krop⁵⁴, T. Kuhl²³, A. Kumar⁶⁹, S. Kunori⁶¹, A. Kupco¹⁰, T. Kurča¹⁹, J. Kvita⁸, F. Lacroix¹², D. Lam⁵⁵, S. Lammers⁷⁰, G. Landsberg⁷⁷, P. Lebrun¹⁹, W. M. Lee⁵⁰, A. Leflat³⁷, F. Lehner⁴¹, J. Lellouch¹⁶, J. Leveque⁴⁵, P. Lewis⁴³, J. Li⁷⁸, Q. Z. Li⁵⁰, L. Li⁴⁸, S. M. Lietti⁴, J. G. R. Lima⁵², D. Lincoln⁵⁰, J. Linnemann⁶⁵, V. V. Lipaev³⁸, R. Lipton⁵⁰, Y. Liu^6,**, Z. Liu⁵, L. Lobo⁴³, A. Lobodenko³⁹, M. Lokajicek¹⁰, A. Lounis¹⁸, P. Love⁴², H. J. Lubatti⁸², A. L. Lyon⁵⁰, A. K. A. Maciel², D. Mackin⁸⁰, R. J. Madaras⁴⁶, P. Mättig²⁵, C. Magass²⁰, A. Magerkurth⁶⁴, N. Makovec¹⁵, P. K. Mal⁵⁵, H. B. Malbouisson³, S. Malik⁶⁷, V. L. Malyshev³⁵, H. S. Mao⁵⁰, Y. Maravin⁵⁹, B. Martin¹³, R. McCarthy⁷², A. Melnitchouk⁶⁶, A. Mendes¹⁴, L. Mendoza⁷, P. G. Mercadante⁴, M. Merkin³⁷, K. W. Merritt⁵⁰, J. Meyer²¹, A. Meyer²⁰, M. Michaut¹⁷, T. Millet¹⁹, J. Mitrevski⁷⁰, J. Molina³, R. K. Mommsen⁴⁴, N. K. Mondal²⁸, R. W. Moore⁵, T. Moulik⁵⁸, G. S. Muanza¹⁹, M. Mulders⁵⁰, M. Mulhearn⁷⁰, O. Mundal²¹, L. Mundim³, E. Nagy¹⁴, M. Naimuddin⁵⁰, M. Narain⁷⁷, N. A. Naumann³⁴, H. A. Neal⁶⁴, J. P. Negret⁷, P. Neustroev³⁹, H. Nilsen²², H. Nogima³, A. Nomerotski⁵⁰, S. F. Novaes⁴, T. Nunnemann²⁴, V. O’Dell⁵⁰, D. C. O’Neil⁵, G. Obrant³⁹, C. Ochando¹⁵, D. Onoprienko⁵⁹, N. Oshima⁵⁰, J. Osta⁵⁵, R. Otec⁹, G. J. Otero y Garzón⁵¹, M. Owen⁴⁴, P. Padley⁸⁰, M. Pangilinan⁷⁷, N. Parashar⁵⁶, S.-J. Park⁷¹, S. K. Park³⁰, J. Parsons⁷⁰, R. Partridge⁷⁷, N. Parua⁵⁴, A. Patwa⁷³, G. Pawloski⁸⁰, B. Penning²², M. Perfilov³⁷, K. Peters⁴⁴, Y. Peters²⁵, P. Pétroff¹⁵, M. Petteni⁴³, R. Piegaia¹, J. Piper⁶⁵, M.-A. Pleier²¹, P. L. M. Podesta-Lerma^32,‡, V. M. Podstavkov⁵⁰, Y. Pogorelov⁵⁵, M.-E. Pol², P. Polozov³⁶, B. G. Pope⁶⁵, A. V. Popov³⁸, C. Potter⁵, W. L. Prado da Silva³, H. B. Prosper⁴⁹, S. Protopopescu⁷³, J. Qian⁶⁴, A. Quadt^21,§, B. Quinn⁶⁶, A. Rakitine⁴², M. S. Rangel², K. Ranjan²⁷, P. N. Ratoff⁴², P. Renkel⁷⁹, S. Reucroft⁶³, P. Rich⁴⁴, M. Rijssenbeek⁷², I. Ripp-Baudot¹⁸, F. Rizatdinova⁷⁶, S. Robinson⁴³, R. F. Rodrigues³, M. Rominsky⁷⁵, C. Royon¹⁷, P. Rubinov⁵⁰, R. Ruchti⁵⁵, G. Safronov³⁶, G. Sajot¹³, A. Sánchez-Hernández³², M. P. Sanders¹⁶, A. Santoro³, G. Savage⁵⁰, L. Sawyer⁶⁰, T. Scanlon⁴³, D. Schaile²⁴, R. D. Schamberger⁷², Y. Scheglov³⁹, H. Schellman⁵³, P. Schieferdecker²⁴, T. Schliephake²⁵, C. Schwanenberger⁴⁴, A. Schwartzman⁶⁸, R. Schwienhorst⁶⁵, J. Sekaric⁴⁹, H. Severini⁷⁵, E. Shabalina⁵¹, M. Shamim⁵⁹, V. Shary¹⁷, A. A. Shchukin³⁸, R. K. Shivpuri²⁷, D. Shpakov⁵⁰, V. Siccardi¹⁸, V. Simak⁹, V. Sirotenko⁵⁰, P. Skubic⁷⁵, P. Slattery⁷¹, D. Smirnov⁵⁵, J. Snow⁷⁴, G. R. Snow⁶⁷, S. Snyder⁷³, S. Söldner-Rembold⁴⁴, L. Sonnenschein¹⁶, A. Sopczak⁴², M. Sosebee⁷⁸, K. Soustruznik⁸, M. Souza², B. Spurlock⁷⁸, J. Stark¹³, J. Steele⁶⁰, V. Stolin³⁶, D. A. Stoyanova³⁸, J. Strandberg⁶⁴, S. Strandberg⁴⁰, M. A. Strang⁶⁹, M. Strauss⁷⁵, E. Strauss⁷², R. Ströhmer²⁴, D. Strom⁵³, L. Stutte⁵⁰, S. Sumowidagdo⁴⁹, P. Svoisky⁵⁵, A. Sznajder³, M. Talby¹⁴, P. Tamburello⁴⁵, A. Tanasijczuk¹, W. Taylor⁵, J. Temple⁴⁵, B. Tiller²⁴, F. Tissandier¹², M. Titov¹⁷, V. V. Tokmenin³⁵, T. Toole⁶¹, I. Torchiani²², T. Trefzger²³, D. Tsybychev⁷², B. Tuchming¹⁷, C. Tully⁶⁸, P. M. Tuts⁷⁰, R. Unalan⁶⁵, S. Uvarov³⁹, L. Uvarov³⁹, S. Uzunyan⁵², B. Vachon⁵, P. J. van den Berg³³, R. Van Kooten⁵⁴, W. M. van Leeuwen³³, N. Varelas⁵¹, E. W. Varnes⁴⁵, I. A. Vasilyev³⁸, M. Vaupel²⁵, P. Verdier¹⁹, L. S. Vertogradov³⁵, M. Verzocchi⁵⁰, F. Villeneuve-Seguier⁴³, P. Vint⁴³, P. Vokac⁹, E. Von Toerne⁵⁹, M. Voutilainen^67,∥, R. Wagner⁶⁸, H. D. Wahl⁴⁹, L. Wang⁶¹, M. H. L. S Wang⁵⁰, J. Warchol⁵⁵, G. Watts⁸², M. Wayne⁵⁵, M. Weber⁵⁰, G. Weber²³, A. Wenger^22,¶, N. Wermes²¹, M. Wetstein⁶¹, A. White⁷⁸, D. Wicke²⁵, G. W. Wilson⁵⁸, S. J. Wimpenny⁴⁸, M. Wobisch⁶⁰, D. R. Wood⁶³, T. R. Wyatt⁴⁴, Y. Xie⁷⁷, S. Yacoob⁵³, R. Yamada⁵⁰, M. Yan⁶¹, T. Yasuda⁵⁰, Y. A. Yatsunenko³⁵, K. Yip⁷³, H. D. Yoo⁷⁷, S. W. Youn⁵³, J. Yu⁷⁸, A. Zatserklyaniy⁵², C. Zeitnitz²⁵, D. Zhang⁵⁰, T. Zhao⁸², B. Zhou⁶⁴, J. Zhu⁷², M. Zielinski⁷¹, D. Zieminska⁵⁴, A. Zieminski⁵⁴, L. Zivkovic⁷⁰, V. Zutshi⁵², and E. G. Zverev³⁷ (D0 Collaboration)

¹Universidad de Buenos Aires, Buenos Aires, Argentina
²LAFEX, Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil
³Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
⁴Instituto de Física Teórica, Universidade Estadual Paulista, São Paulo, Brazil
⁵University of Alberta, Edmonton, Alberta, Canada, Simon Fraser University, Burnaby, British Columbia, Canada, York University, Toronto, Ontario, Canada, and McGill University, Montreal, Quebec, Canada
⁶University of Science and Technology of China, Hefei, Peoples Republic of China
⁷Universidad de los Andes, Bogotá, Colombia
⁸Center for Particle Physics, Charles University, Prague, Czech Republic
⁹Czech Technical University, Prague, Czech Republic
¹⁰Center for Particle Physics, Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
¹¹Universidad San Francisco de Quito, Quito, Ecuador
¹²Laboratoire de Physique Corpusculaire, IN2P3-CNRS, Université Blaise Pascal, Clermont-Ferrand, France
¹³Laboratoire de Physique Subatomique et de Cosmologie, IN2P3-CNRS, Universite de Grenoble 1, Grenoble, France
¹⁴CPPM, IN2P3-CNRS, Université de la Méditerranée, Marseille, France
¹⁵Laboratoire de l’Accélérateur Linéaire, IN2P3-CNRS et Université Paris-Sud, Orsay, France
¹⁶LPNHE, IN2P3-CNRS, Universités Paris VI and VII, Paris, France
¹⁷DAPNIA/Service de Physique des Particules, CEA, Saclay, France
¹⁸IPHC, Université Louis Pasteur et Université de Haute Alsace, CNRS, IN2P3, Strasbourg, France
¹⁹IPNL, Université Lyon 1, CNRS/IN2P3, Villeurbanne, France and Université de Lyon, Lyon, France
²⁰III. Physikalisches Institut A, RWTH Aachen, Aachen, Germany
²¹Physikalisches Institut, Universität Bonn, Bonn, Germany
²²Physikalisches Institut, Universität Freiburg, Freiburg, Germany
²³Institut für Physik, Universität Mainz, Mainz, Germany
²⁴Ludwig-Maximilians-Universität München, München, Germany
²⁵Fachbereich Physik, University of Wuppertal, Wuppertal, Germany
²⁶Panjab University, Chandigarh, India
²⁷Delhi University, Delhi, India
²⁸Tata Institute of Fundamental Research, Mumbai, India
²⁹University College Dublin, Dublin, Ireland
³⁰Korea Detector Laboratory, Korea University, Seoul, Korea
³¹SungKyunKwan University, Suwon, Korea
³²CINVESTAV, Mexico City, Mexico
³³FOM-Institute NIKHEF and University of Amsterdam/NIKHEF, Amsterdam, The Netherlands
³⁴Radboud University Nijmegen/NIKHEF, Nijmegen, The Netherlands
³⁵Joint Institute for Nuclear Research, Dubna, Russia
³⁶Institute for Theoretical and Experimental Physics, Moscow, Russia
³⁷Moscow State University, Moscow, Russia
³⁸Institute for High Energy Physics, Protvino, Russia
³⁹Petersburg Nuclear Physics Institute, St. Petersburg, Russia
⁴⁰Lund University, Lund, Sweden, Royal Institute of Technology and Stockholm University, Stockholm, Sweden, and Uppsala University, Uppsala, Sweden
⁴¹Physik Institut der Universität Zürich, Zürich, Switzerland
⁴²Lancaster University, Lancaster, United Kingdom
⁴³Imperial College, London, United Kingdom
⁴⁴University of Manchester, Manchester, United Kingdom
⁴⁵University of Arizona, Tucson, Arizona 85721, USA
⁴⁶Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA
⁴⁷California State University, Fresno, California 93740, USA
⁴⁸University of California, Riverside, California 92521, USA
⁴⁹Florida State University, Tallahassee, Florida 32306, USA
⁵⁰Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
⁵¹University of Illinois at Chicago, Chicago, Illinois 60607, USA
⁵²Northern Illinois University, DeKalb, Illinois 60115, USA
⁵³Northwestern University, Evanston, Illinois 60208, USA
⁵⁴Indiana University, Bloomington, Indiana 47405, USA
⁵⁵University of Notre Dame, Notre Dame, Indiana 46556, USA
⁵⁶Purdue University Calumet, Hammond, Indiana 46323, USA
⁵⁷Iowa State University, Ames, Iowa 50011, USA
⁵⁸University of Kansas, Lawrence, Kansas 66045, USA
⁵⁹Kansas State University, Manhattan, Kansas 66506, USA
⁶⁰Louisiana Tech University, Ruston, Louisiana 71272, USA
⁶¹University of Maryland, College Park, Maryland 20742, USA
⁶²Boston University, Boston, Massachusetts 02215, USA
⁶³Northeastern University, Boston, Massachusetts 02115, USA
⁶⁴University of Michigan, Ann Arbor, Michigan 48109, USA
⁶⁵Michigan State University, East Lansing, Michigan 48824, USA
⁶⁶University of Mississippi, University, Mississippi 38677, USA
⁶⁷University of Nebraska, Lincoln, Nebraska 68588, USA
⁶⁸Princeton University, Princeton, New Jersey 08544, USA
⁶⁹State University of New York, Buffalo, New York 14260, USA
⁷⁰Columbia University, New York, New York 10027, USA
⁷¹University of Rochester, Rochester, New York 14627, USA
⁷²State University of New York, Stony Brook, New York 11794, USA
⁷³Brookhaven National Laboratory, Upton, New York 11973, USA
⁷⁴Langston University, Langston, Oklahoma 73050, USA
⁷⁵University of Oklahoma, Norman, Oklahoma 73019, USA
⁷⁶Oklahoma State University, Stillwater, Oklahoma 74078, USA
⁷⁷Brown University, Providence, Rhode Island 02912, USA
⁷⁸University of Texas, Arlington, Texas 76019, USA
⁷⁹Southern Methodist University, Dallas, Texas 75275, USA
⁸⁰Rice University, Houston, Texas 77005, USA
⁸¹University of Virginia, Charlottesville, Virginia 22901, USA
⁸²University of Washington, Seattle, Washington 98195, USA

^*Visitor from Augustana College, Sioux Falls, SD, USA.
^†Visitor from The University of Liverpool, Liverpool, United Kingdom
^‡Visitor from ICN-UNAM, Mexico City, Mexico
^§Visitor from II. Physikalisches Institut, Georg-August-University Göttingen, Germany
^∥Visitor from Helsinki Institute of Physics, Helsinki, Finland
^¶Visitor from Universität Zürich, Zürich, Switzerland
^**Fermilab International Fellow
^††Deceased

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Phys. Rev. D 76, 111104(R) – Published 28 December, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.111104

Abstract

We present measurements of the process $p \bar{p} \to W Z + X \to ℓ^{'} ν_{ℓ^{'}} ℓ \bar{ℓ}$ at $\sqrt{s} = 1.96 TeV$ , where $ℓ$ and $ℓ^{'}$ are electrons or muons. Using $1 {fb}^{- 1}$ of data from the D0 experiment, we observe 13 candidates with an expected background of $4.5 \pm 0.6$ events and measure a cross section $σ (W Z) = {2.7}_{- 1.3}^{+ 1.7} pb$ . From the number of observed events and the $Z$ boson transverse momentum distribution, we limit the trilinear $W W Z$ gauge couplings to $- 0.17 \leq λ_{Z} \leq 0.21 (Δ κ_{Z} = 0)$ at the 95% C.L. for a form factor scale $Λ = 2 TeV$ . Further, assuming that $Δ g_{1}^{Z} = Δ κ_{Z}$ , we find $- 0.12 \leq Δ κ_{Z} \leq 0.29 (λ_{Z} = 0)$ at the 95% C.L. These are the most restrictive limits on the $W W Z$ couplings available to date.

Article Text

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Measurement of the $p \bar{p} \to W Z + X$ cross section at $\sqrt{s} = 1.96 TeV$ and limits on $W W Z$ trilinear gauge couplings

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Measurement of the pp¯→WZ+X cross section at s=1.96 TeV and limits on WWZ trilinear gauge couplings

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Measurement of the $p \bar{p} \to W Z + X$ cross section at $\sqrt{s} = 1.96 TeV$ and limits on $W W Z$ trilinear gauge couplings