- Physical Review Journals
All JournalsPhysics Magazine
Access Provided by Xinjiang University

Physical Review D

Export citation

Export citation

Choose format for download:

Download Citation
  • Access by Xinjiang University

Constraining the strength and CP structure of dark production at the LHC: The associated top-pair channel

Matthew R. Buckley1 and Dorival Gonçalves2

  • 1Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 2Institute for Particle Physics Phenomenology, Department of Physics, Durham University Durham DH1 3LE, United Kingdom

PDF

Phys. Rev. D 93, 034003 – Published 2 February, 2016

DOI: https://doi.org/10.1103/PhysRevD.93.034003

Abstract

We consider the production of dark matter in association with a pair of top quarks, mediated by a scalar or pseudoscalar particle in a generic Simplified Model. We demonstrate that the difference of azimuthal angle between the two leptons Δϕℓℓ, in the dileptonic top decay mode, can directly probe the CP-properties of the mediator. We estimate the constraints to strength and CP-structure of dark matter production for these well-motivated Simplified Models from the LHC Run II.

View figure in article

Physics Subject Headings (PhySH)

Article Text

References (92)

  1. M. R. Buckley, Asymmetric dark matter and effective operators, Phys. Rev. D 84, 043510 (2011).
  2. A. Birkedal, K. Matchev, and M. Perelstein, Dark matter at colliders: A model independent approach, Phys. Rev. D 70, 077701 (2004).
  3. J. L. Feng, S. Su, and F. Takayama, Lower Limit on Dark Matter Production at the Large Hadron Collider, Phys. Rev. Lett. 96, 151802 (2006).
  4. M. Beltran, D. Hooper, E. W. Kolb, and Z. C. Krusberg, Deducing the nature of dark matter from direct and indirect detection experiments in the absence of collider signatures of new physics, Phys. Rev. D 80, 043509 (2009).
  5. P. Konar, K. Kong, K. T. Matchev, and M. Perelstein, Shedding light on the dark sector with direct WIMP production, New J. Phys. 11, 105004 (2009).
  6. M. Beltran, D. Hooper, E. W. Kolb, Z. A. C. Krusberg, and T. M. P. Tait, Maverick dark matter at colliders, J. High Energy Phys. 09 (2010) 037.
  7. Y. Bai, P. J. Fox, and R. Harnik, The Tevatron at the frontier of dark matter direct detection, J. High Energy Phys. 12 (2010) 048.
  8. A. Rajaraman, W. Shepherd, T. M. P. Tait, and A. M. Wijangco, LHC bounds on interactions of dark matter, Phys. Rev. D 84, 095013 (2011).
  9. P. J. Fox, R. Harnik, J. Kopp, and Y. Tsai, Missing energy signatures of dark matter at the LHC, Phys. Rev. D 85, 056011 (2012).
  10. Y. Bai and T. M. P. Tait, Searches with mono-leptons, Phys. Lett. B 723, 384 (2013).
  11. P. J. Fox, R. Harnik, R. Primulando, and C. T. Yu, Taking a razor to dark matter parameter space at the LHC, Phys. Rev. D 86, 015010 (2012).
  12. L. M. Carpenter, A. Nelson, C. Shimmin, T. M. P. Tait, and D. Whiteson, Collider searches for dark matter in events with a Z boson and missing energy, Phys. Rev. D 87, 074005 (2013).
  13. P. J. Fox, R. Harnik, J. Kopp, and Y. Tsai, LEP shines light on dark matter, Phys. Rev. D 84, 014028 (2011).
  14. I. M. Shoemaker and L. Vecchi, Unitarity and monojet bounds on models for DAMA, CoGeNT, and CRESST-II, Phys. Rev. D 86, 015023 (2012).
  15. N. Weiner and I. Yavin, How dark are majorana WIMPs? Signals from MiDM and Rayleigh dark matter, Phys. Rev. D 86, 075021 (2012).
  16. G. Busoni, A. De Simone, E. Morgante, and A. Riotto, On the validity of the effective field theory for dark matter searches at the LHC, Phys. Lett. B 728, 412 (2014).
  17. O. Buchmueller, M. J. Dolan, and C. McCabe, Beyond effective field theory for dark matter searches at the LHC, J. High Energy Phys. 01 (2014) 025.
  18. O. Buchmueller, M. J. Dolan, S. A. Malik, and C. McCabe, Characterising dark matter searches at colliders and direct detection experiments: Vector mediators, J. High Energy Phys. 01 (2015) 037.
  19. G. Busoni, A. De Simone, J. Gramling, E. Morgante, and A. Riotto, On the validity of the effective field theory for dark matter searches at the LHC, Part II: Complete analysis for the s-channel, J. Cosmol. Astropart. Phys. 06 (2014) 060.
  20. G. Busoni, A. De Simone, T. Jacques, E. Morgante, and A. Riotto, On the validity of the effective field theory for dark matter searches at the LHC Part III: Analysis for the t-channel, J. Cosmol. Astropart. Phys. 09 (2014) 022.
  21. J. Alwall, P. Schuster, and N. Toro, Simplified models for a first characterization of new physics at the LHC, Phys. Rev. D 79, 075020 (2009).
  22. D. Alves et al. (LHC New Physics Working Group Collaboration), Simplified models for LHC new physics searches, J. Phys. G 39, 105005 (2012).
  23. J. Goodman and W. Shepherd, LHC Bounds on UV-Complete Models of Dark Matter, arXiv:1111.2359.
  24. T. Jacques and K. Nordstrm, Mapping monojet constraints onto simplified dark matter models, J. High Energy Phys. 06 (2015) 142.
  25. R. M. Godbole, G. Mendiratta, and T. M. P. Tait, A simplified model for dark matter interacting primarily with gluons, J. High Energy Phys. 08 (2015) 064.
  26. J. Abdallah et al., Simplified models for dark matter searches at the LHC, Phys. Dark Univ. 9–10, 8 (2015).
  27. D. Abercrombie et al., Dark Matter Benchmark Models for Early LHC Run-2 Searches: Report of the ATLAS/CMS Dark Matter Forum, arXiv:1507.00966.
  28. M. R. Buckley, D. Feld, and D. Goncalves, Scalar simplified models for dark matter, Phys. Rev. D 91, 015017 (2015).
  29. U. Haisch, F. Kahlhoefer, and J. Unwin, The impact of heavy-quark loops on LHC dark matter searches, J. High Energy Phys. 07 (2013) 125.
  30. U. Haisch, F. Kahlhoefer, and E. Re, QCD effects in mono-jet searches for dark matter, J. High Energy Phys. 12 (2013) 007.
  31. U. Haisch, A. Hibbs, and E. Re, Determining the structure of dark-matter couplings at the LHC, Phys. Rev. D 89, 034009 (2014).
  32. A. Crivellin, F. D’Eramo, and M. Procura, New Constraints on Dark Matter Effective Theories from Standard Model Loops, Phys. Rev. Lett. 112, 191304 (2014).
  33. K. Ghorbani, Fermionic dark matter with pseudo-scalar Yukawa interaction, J. Cosmol. Astropart. Phys. 01 (2015) 015.
  34. M. Backovi, M. Kramer, F. Maltoni, A. Martini, K. Mawatari, and M. Pellen, Higher-order QCD predictions for dark matter production at the LHC in simplified models with s-channel mediators, Eur. Phys. J. C 75, 482 (2015).
  35. P. Harris, V. V. Khoze, M. Spannowsky, and C. Williams, Constraining dark sectors at colliders: Beyond the effective theory approach, Phys. Rev. D 91, 055009 (2015).
  36. P. Harris, V. V. Khoze, M. Spannowsky, and C. Williams, Closing up on Dark Sectors at Colliders: from 14 to 100 TeV, arXiv:1509.02904.
  37. M. Casolino, T. Farooque, A. Juste, T. Liu, and M. Spannowsky, Probing a light CP-odd scalar in di-top-associated production at the LHC, Eur. Phys. J. C 75, 498 (2015).
  38. O. Mattelaer and E. Vryonidou, Dark matter production through loop-induced processes at the LHC: The s-channel mediator case, Eur. Phys. J. C 75, 436 (2015).
  39. J. Fan, S. M. Koushiappas, and G. Landsberg, Pseudoscalar Portal Dark Matter and New Signatures of Vector-like Fermions, arXiv:1507.06993.
  40. V. V. Khoze, G. Ro, and M. Spannowsky, Spectroscopy of scalar mediators to dark matter at the LHC and at 100 TeV, Phys. Rev. D 92, 075006 (2015).
  41. U. Haisch and E. Re, Simplified dark matter top-quark interactions at the LHC, J. High Energy Phys. 06 (2015) 078.
  42. A. Berlin, S. Gori, T. Lin, and L. T. Wang, Pseudoscalar portal dark matter, Phys. Rev. D 92, 015005 (2015).
  43. G. D’Ambrosio, G. F. Giudice, G. Isidori, and A. Strumia, Minimal flavor violation: An effective field theory approach, Nucl. Phys. B645, 155 (2002).
  44. B. Patt and F. Wilczek, Higgs-field Portal into Hidden Sectors, arXiv:hep-ph/0605188.
  45. A. Djouadi, O. Lebedev, Y. Mambrini, and J. Quevillon, Implications of LHC searches for Higgs–portal dark matter, Phys. Lett. B 709, 65 (2012).
  46. A. Djouadi, A. Falkowski, Y. Mambrini, and J. Quevillon, Direct detection of Higgs-portal dark matter at the LHC, Eur. Phys. J. C 73, 2455 (2013).
  47. D. Goncalves, F. Krauss, S. Kuttimalai, and P. Maierhfer, Higgs-Strahlung: Merging the NLO Drell-Yan and loop-induced 0+1 jet multiplicities, Phys. Rev. D 92, 073006 (2015).
  48. T. Corbett, O. J. P. Eboli, D. Goncalves, J. Gonzalez-Fraile, T. Plehn, and M. Rauch, The Higgs legacy of the LHC Run I, J. High Energy Phys. 08 (2015) 156.
  49. C. Bernaciak, T. Plehn, P. Schichtel, and J. Tattersall, Spying an invisible Higgs boson, Phys. Rev. D 91, 035024 (2015).
  50. C. Englert, J. Jaeckel, V. V. Khoze, and M. Spannowsky, Emergence of the electroweak scale through the Higgs portal, J. High Energy Phys. 04 (2013) 060.
  51. M. Endo and Y. Takaesu, Heavy WIMP through Higgs portal at the LHC, Phys. Lett. B 743, 228 (2015).
  52. C. Englert, T. Plehn, D. Zerwas, and P. M. Zerwas, Exploring the Higgs portal, Phys. Lett. B 703, 298 (2011).
  53. N. Craig, H. K. Lou, M. McCullough, and A. Thalapillil, The Higgs Portal Above Threshold, arXiv:1412.0258.
  54. N. Craig, F. D’Eramo, P. Draper, S. Thomas, and H. Zhang, The hunt for the rest of the Higgs bosons, J. High Energy Phys. 06 (2015) 137.
  55. G. Aad et al. (ATLAS Collaboration), Search for dark matter in events with heavy quarks and missing transverse momentum in pp collisions with the ATLAS detector, Eur. Phys. J. C 75, 92 (2015).
  56. M. R. Buckley and D. Goncalves, Boosting the Direct CP Measurement of the Higgs-Top Coupling, arXiv:1507.07926.
  57. J. Ellis, D. S. Hwang, K. Sakurai, and M. Takeuchi, Disentangling Higgs-top couplings in associated production, J. High Energy Phys. 04 (2014) 004.
  58. F. Boudjema, R. M. Godbole, D. Guadagnoli, and K. A. Mohan, Lab-frame observables for probing the top-Higgs interaction, Phys. Rev. D 92, 015019 (2015).
  59. F. Demartin, F. Maltoni, K. Mawatari, B. Page, and M. Zaro, Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction, Eur. Phys. J. C 74, 3065 (2014).
  60. S. Biswas, R. Frederix, E. Gabrielli, and B. Mele, Enhancing the tt¯H signal through top-quark spin polarization effects at the LHC, J. High Energy Phys. 07 (2014) 020.
  61. S. Khatibi and M. M. Najafabadi, Exploring the anomalous Higgs-top couplings, Phys. Rev. D 90, 074014 (2014).
  62. K. Kolodziej and A. Slapik, Probing the top-Higgs coupling through the secondary lepton distributions in the associated production of the top-quark pair and Higgs boson at the LHC, Eur. Phys. J. C 75, 475 (2015).
  63. J. Goodman, M. Ibe, A. Rajaraman, W. Shepherd, T. M. P. Tait, and H. B. Yu, Constraints on light Majorana dark matter from colliders, Phys. Lett. B 695, 185 (2011).
  64. J. Goodman, M. Ibe, A. Rajaraman, W. Shepherd, T. M. P. Tait, and H. B. Yu, Constraints on dark matter from colliders, Phys. Rev. D 82, 116010 (2010).
  65. V. Khachatryan et al. (CMS Collaboration), Search for dark matter, extra dimensions, and unparticles in monojet events in proton-proton collisions at s=8  TeV, Eur. Phys. J. C 75, 235 (2015).
  66. E. Diehl (ATLAS Collaboration), The search for dark matter using monojets and monophotons with the ATLAS detector, AIP Conf. Proc. 1604, 324 (2014).
  67. G. Mahlon and S. J. Parke, Angular correlations in top quark pair production and decay at hadron colliders, Phys. Rev. D 53, 4886 (1996).
  68. C. R. Schmidt and M. E. Peskin, A Probe of CP Violation in Top Quark Pair Production at Hadron Supercolliders, Phys. Rev. Lett. 69, 410 (1992).
  69. H. Murayama, I. Watanabe, and K. Hagiwara, Report No. KEK-91-11.
  70. J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer, and T. Stelzer, MadGraph 5: Going beyond, J. High Energy Phys. 06 (2011) 128.
  71. T. Sjostrand, S. Mrenna, and P. Z. Skands, A brief introduction to PYTHIA 8.1, Comput. Phys. Commun. 178, 852 (2008).
  72. T. Gleisberg, S. Höche, F. Krauss, M. Schönherr, S. Schumann, F. Siegert, and J. Winter, Event generation with SHERPA 1.1, J. High Energy Phys. 02 (2009) 007.
  73. F. Krauss, R. Kuhn, and G. Soff, AMEGIC++ 1.0: A matrix element generator in C++, J. High Energy Phys. 02 (2002) 044.
  74. T. Gleisberg and S. Hoeche, Comix, a new matrix element generator, J. High Energy Phys. 12 (2008) 039.
  75. T. Gleisberg and F. Krauss, Automating dipole subtraction for QCD NLO calculations, Eur. Phys. J. C 53 (2008) 501.
  76. S. Höche, F. Krauss, M. Schönherr, and F. Siegert, A critical appraisal of NLO+PS matching methods, J. High Energy Phys. 09 (2012) 049.
  77. F. Cascioli, P. Maierhöfer, and S. Pozzorini, Scattering Amplitudes with Open Loops, Phys. Rev. Lett. 108, 111601 (2012); G. Ossola, C. G. Papadopoulos, and R. Pittau, CutTools: A program implementing the OPP reduction method to compute one-loop amplitudes, J. High Energy Phys. 03 (2008) 042; A. van Hameren, OneLOop: For the evaluation of one-loop scalar functions, Comput. Phys. Commun. 182, 2427 (2011).
  78. S. Frixione and B. R. Webber, Matching NLO QCD computations and parton shower simulations, J. High Energy Phys. 06 (2002) 029.
  79. P. Artoisenet, R. Frederix, O. Mattelaer, and R. Rietkerk, Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations, J. High Energy Phys. 03 (2013) 015.
  80. S. Höche, S. Kuttimalai, S. Schumann, and F. Siegert, Beyond standard model calculations with Sherpa, Eur. Phys. J. C 75, 135 (2015).
  81. M. Cacciari, G. P. Salam, and G. Soyez, The anti-k(t) jet clustering algorithm, J. High Energy Phys. 04 (2008) 063.
  82. M. Cacciari, G. P. Salam, and G. Soyez, FastJet user manual, Eur. Phys. J. C 72, 1896 (2012).
  83. D. S. Akerib et al. (LUX Collaboration), First Results from the LUX Dark Matter Experiment at the Sanford Underground Research Facility, Phys. Rev. Lett. 112, 091303 (2014).
  84. M. Ackermann et al. (Fermi-LAT Collaboration), Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi-LAT Data, Phys. Rev. Lett. 115, 231301 (2015).
  85. O. J. P. Eboli and D. Zeppenfeld, Observing an invisible Higgs boson, Phys. Lett. B 495, 147 (2000).
  86. T. Plehn, D. L. Rainwater, and D. Zeppenfeld, Determining the Structure of Higgs Couplings at the LHC, Phys. Rev. Lett. 88, 051801 (2002).
  87. M. R. Buckley and M. J. Ramsey-Musolf, Diagnosing spin at the LHC via vector boson fusion, J. High Energy Phys. 09 (2011) 094.
  88. C. Englert, D. Goncalves-Netto, K. Mawatari, and T. Plehn, Higgs quantum numbers in weak boson fusion, J. High Energy Phys. 01 (2013) 148.
  89. G. Klamke and D. Zeppenfeld, Higgs plus two jet production via gluon fusion as a signal at the CERN LHC, J. High Energy Phys. 04 (2007) 052.
  90. M. J. Dolan, P. Harris, M. Jankowiak, and M. Spannowsky, Constraining CP-violating Higgs sectors at the LHC using gluon fusion, Phys. Rev. D 90, 073008 (2014).
  91. M. R. Buckley, T. Plehn, and M. J. Ramsey-Musolf, Top squark with mass close to the top quark, Phys. Rev. D 90, 014046 (2014).
  92. M. Buschmann, D. Goncalves, S. Kuttimalai, M. Schonherr, F. Krauss, and T. Plehn, Mass effects in the Higgs-gluon coupling: Boosted vs off-shell production, J. High Energy Phys. 02 (2015) 038.

Outline

Information

Phys. Rev. D 93, 034003– Published 2 February, 2016
  • Received 4 December 2015

© 2016 American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation