- Physical Review Journals
All JournalsPhysics Magazine

Physical Review D

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

Export citation

Export citation

Choose format for download:

Download Citation
  • Open Access

CP violation at ATLAS in effective field theory

Supratim Das Bakshi1,*, Joydeep Chakrabortty1,†, Christoph Englert2,‡, Michael Spannowsky3,§, and Panagiotis Stylianou2,∥

  • 1Indian Institute of Technology Kanpur, Kalyanpur, Kanpur 208016, India
  • 2School of Physics & Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 3Institute for Particle Physics Phenomenology, Durham University, Durham DH1 3LE, United Kingdom

  • *sdbakshi@iitk.ac.in
  • †joydeep@iitk.ac.in
  • ‡christoph.englert@glasgow.ac.uk
  • §michael.spannowsky@durham.ac.uk
  • ∥p.stylianou.1@research.gla.ac.uk
PDF

Phys. Rev. D 103, 055008 – Published 15 March, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.055008

Abstract

CP violation beyond the Standard Model (SM) is a crucial missing piece for explaining the observed matter-antimatter asymmetry in the Universe. Recently, the ATLAS experiment at the Large Hadron Collider performed an analysis of electroweak Zjj production, thereby excluding the SM locally at 95% confidence level in the measurement of CP-sensitive observables. We take the excess interpretation in terms of anomalous gauge-Higgs interactions at face value and discuss further steps that are required to scrutinize its origin. In particular, we discuss the relevance of multiboson production using adapted angular observables to show how they can be used to directly tension the reported Zjj excess in a more comprehensive analysis. To connect the excess to a concrete UV scenario for which the underlying assumptions of the Zjj analysis are valid, we identify vectorlike leptons as a candidate theory consistent with the observed CP-odd Wilson coefficient hierarchy observed by ATLAS. We perform a complete one-loop matching calculation to motivate further model-specific and correlated new physics searches. In parallel, we provide estimates of the sensitivity reach of the LHC’s high luminosity phase for this particular scenario of CP violation in light of electroweak precision and Run-2 Higgs data. These provide strong constraints on the model’s CP-even low-energy phenomenology, but also inform the size of the CP-odd SM deformation indirectly via our model hypothesis.

View figure in article

Physics Subject Headings (PhySH)

Article Text

References (73)

  1. A. D. Sakharov, Pis’ma Zh. Eksp. Teor. Fiz. 5, 32 (1967) [JETP Lett. 5, 24 (1967)]; Usp. Fiz. Nauk 161, 61 (1991) [Sov. Phys. Usp. 34, 392 (1991)].
  2. G. Aad et al. (ATLAS Collaboration), Phys. Rev. Lett. 125, 061802 (2020).
  3. A. M. Sirunyan et al. (CMS Collaboration), Phys. Rev. Lett. 125, 061801 (2020).
  4. G. Aad et al. (ATLAS Collaboration), arXiv:2006.15458.
  5. B. Grzadkowski, M. Iskrzynski, M. Misiak, and J. Rosiek, J. High Energy Phys. 10 (2010) 085.
  6. K. Arnold et al., Comput. Phys. Commun. 180, 1661 (2009).
  7. J. Baglio et al., arXiv:1404.3940.
  8. J. Bellm et al., Eur. Phys. J. C 76, 196 (2016).
  9. G. Aad et al. (ATLAS Collaboration), J. High Energy Phys. 09 (2011) 072.
  10. S. Chatrchyan et al. (CMS Collaboration), Phys. Rev. D 89, 092005 (2014).
  11. C. J. Goebel, F. Halzen, and J. P. Leveille, Phys. Rev. D 23, 2682 (1981).
  12. S. J. Brodsky and R. W. Brown, Phys. Rev. Lett. 49, 966 (1982).
  13. R. W. Brown, K. L. Kowalski, and S. J. Brodsky, Phys. Rev. D 28, 624 (1983); 29, A2100 (1984).
  14. U. Baur, T. Han, and J. Ohnemus, Phys. Rev. D 48, 5140 (1993).
  15. U. Baur, S. Errede, and G. L. Landsberg, Phys. Rev. D 50, 1917 (1994).
  16. T. Han, AIP Conf. Proc. 350, 224 (1995).
  17. H. Aihara et al., arXiv:hep-ph/9503425.
  18. N. D. Christensen and C. Duhr, Comput. Phys. Commun. 180, 1614 (2009).
  19. A. Alloul, N. D. Christensen, C. Degrande, C. Duhr, and B. Fuks, Comput. Phys. Commun. 185, 2250 (2014).
  20. C. Degrande, C. Duhr, B. Fuks, D. Grellscheid, O. Mattelaer, and T. Reiter, Comput. Phys. Commun. 183, 1201 (2012).
  21. J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer, and T. Stelzer, J. High Energy Phys. 06 (2011) 128.
  22. P. de Aquino, W. Link, F. Maltoni, O. Mattelaer, and T. Stelzer, Comput. Phys. Commun. 183, 2254 (2012).
  23. J. Alwall, R. Frederix, S. Frixione, V. Hirschi, F. Maltoni, O. Mattelaer, H. S. Shao, T. Stelzer, P. Torrielli, and M. Zaro, J. High Energy Phys. 07 (2014) 079.
  24. J. Alwall et al., Comput. Phys. Commun. 176, 300 (2007).
  25. V. Khachatryan et al. (CMS Collaboration), Phys. Lett. B 766, 268 (2017).
  26. M. Aaboud et al. (ATLAS Collaboration), Eur. Phys. J. C 79, 884 (2019).
  27. J. M. Campbell and R. K. Ellis, Phys. Rev. D 60, 113006 (1999).
  28. J. M. Campbell, R. K. Ellis, and C. Williams, J. High Energy Phys. 07 (2011) 018.
  29. J. M. Campbell, R. K. Ellis, and W. T. Giele, Eur. Phys. J. C 75, 246 (2015).
  30. R. Boughezal, J. M. Campbell, R. K. Ellis, C. Focke, W. Giele, X. Liu, F. Petriello, and C. Williams, Eur. Phys. J. C 77, 7 (2017).
  31. J. Campbell and T. Neumann, J. High Energy Phys. 12 (2019) 034.
  32. A. Angelescu and P. Huang, J. High Energy Phys. 01 (2021) 049.
  33. T. Corbett, M. J. Dolan, C. Englert, and K. Nordström, Phys. Rev. D 97, 115040 (2018).
  34. S. D. Bakshi, J. Chakrabortty, and S. K. Patra, Eur. Phys. J. C 79, 21 (2019).
  35. S. A. R. Ellis, J. Quevillon, P. N. H. Vuong, T. You, and Z. Zhang, J. High Energy Phys. 11 (2020) 078.
  36. H. Bélusca-Maïto, A. Falkowski, D. Fontes, J. C. Romão, and J. a. P. Silva, J. High Energy Phys. 04 (2018) 002.
  37. G. F. Giudice, C. Grojean, A. Pomarol, and R. Rattazzi, J. High Energy Phys. 06 (2007) 045.
  38. R. Contino, M. Ghezzi, C. Grojean, M. Muhlleitner, and M. Spira, J. High Energy Phys. 07 (2013) 035.
  39. I. Brivio, Y. Jiang, and M. Trott, J. High Energy Phys. 12 (2017) 070.
  40. A. Dedes, W. Materkowska, M. Paraskevas, J. Rosiek, and K. Suxho, J. High Energy Phys. 06 (2017) 143.
  41. M. Golden and L. Randall, Nucl. Phys. B361, 3 (1991).
  42. B. Holdom and J. Terning, Phys. Lett. B 247, 88 (1990).
  43. G. Altarelli and R. Barbieri, Phys. Lett. B 253, 161 (1991).
  44. M. E. Peskin and T. Takeuchi, Phys. Rev. Lett. 65, 964 (1990).
  45. B. Grinstein and M. B. Wise, Phys. Lett. B 265, 326 (1991).
  46. G. Altarelli, R. Barbieri, and S. Jadach, Nucl. Phys. B369, 3 (1992); B376, 444(E) (1992).
  47. M. E. Peskin and T. Takeuchi, Phys. Rev. D 46, 381 (1992).
  48. C. P. Burgess, S. Godfrey, H. Konig, D. London, and I. Maksymyk, Phys. Lett. B 326, 276 (1994).
  49. C. Grojean, E. E. Jenkins, A. V. Manohar, and M. Trott, J. High Energy Phys. 04 (2013) 016.
  50. C. Englert and M. Spannowsky, Phys. Lett. B 740, 8 (2015).
  51. F. U. Bernlochner, C. Englert, C. Hays, K. Lohwasser, H. Mildner, A. Pilkington, D. D. Price, and M. Spannowsky, Phys. Lett. B 790, 372 (2019).
  52. C. Englert, G. F. Giudice, A. Greljo, and M. Mccullough, J. High Energy Phys. 09 (2019) 041.
  53. A. M. Sirunyan et al. (CMS Collaboration), Eur. Phys. J. C 80, 75 (2020).
  54. S. Dawson and P. P. Giardino, Phys. Rev. D 101, 013001 (2020).
  55. R. Alonso, E. E. Jenkins, A. V. Manohar, and M. Trott, J. High Energy Phys. 04 (2014) 159.
  56. C. W. Murphy, Phys. Rev. D 97, 015007 (2018).
  57. S. Patra, sunandopatra/optex-1.0.0: Wo documentation (2019), 10.5281/zenodo.3404311.
  58. M. Baak, J. Cúth, J. Haller, A. Hoecker, R. Kogler, K. Mönig, M. Schott, and J. Stelzer, Eur. Phys. J. C 74, 3046 (2014).
  59. G. Aad et al. (ATLAS and CMS Collaborations), J. High Energy Phys. 08 (2016) 045.
  60. G. Aad et al. (ATLAS Collaboration), Eur. Phys. J. C 76, 6 (2016).
  61. G. Aad et al. (ATLAS Collaboration), Phys. Rev. D 101, 012002 (2020).
  62. G. Aad et al. (ATLAS Collaboration), Eur. Phys. J. C 80, 957 (2020).
  63. G. Aad et al. (ATLAS Collaboration), Phys. Lett. B 809, 135754 (2020).
  64. G. Aad et al. (ATLAS Collaboration), Report No. ATLAS-CONF-2019-028.
  65. G. Aad et al. (ATLAS Collaboration), Report No. ATLAS-CONF-2020-007.
  66. M. Aaboud et al. (ATLAS Collaboration), Phys. Rev. D 97, 072003 (2018).
  67. M. Aaboud et al. (ATLAS Collaboration), Phys. Lett. B 784, 173 (2018).
  68. G. Aad et al. (ATLAS Collaboration), Phys. Lett. B 798, 134949 (2019).
  69. A. M. Sirunyan et al. (CMS Collaboration), Eur. Phys. J. C 79, 421 (2019).
  70. A. M. Sirunyan et al. (CMS Collaboration), J. High Energy Phys. 03 (2020) 131.
  71. N. Kumar and S. P. Martin, Phys. Rev. D 92, 115018 (2015).
  72. D. Huang, A. P. Morais, and R. Santos, J. High Energy Phys. 01 (2021) 168.
  73. V. Cirigliano, A. Crivellin, W. Dekens, J. de Vries, M. Hoferichter, and E. Mereghetti, Phys. Rev. Lett. 123, 051801 (2019).

Outline

Information

Phys. Rev. D 103, 055008– Published 15 March, 2021
  • Received 6 October 2020
  • Accepted 3 February 2021
Crossmark - Check for updates button
Creative Commons Logo

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.

Published by the American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation