Abstract
We study the prospects for probing the CP structure of hqq interactions using the decays of the lightest baryon Λq formed in the quark’s hadronization. The low yields of reconstructible events make it unlikely for tests to be performed with the next generation of colliders. In h → b\( \overline{b} \) → Λb\( \overline{\Lambda} \)b decays a CP-sensitive distribution could be measured with a high-luminosity e+e− collider, while in both h → b\( \overline{b} \) → Λb\( \overline{\Lambda} \)b and h → c\( \overline{c} \) → Λc\( \overline{\Lambda} \)c decays such a distribution could be measured with a very high luminosity μ+μ− collider. However, we find that only the μ+μ− collider can produce enough h → b\( \overline{b} \) → Λb\( \overline{\Lambda} \)b decays to probe a physical CP asymmetry in the hbb vertex.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ATLAS collaboration, Higgs boson production cross-section measurements and their EFT interpretation in the 4ℓ decay channel at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, Eur. Phys. J. C 80 (2020) 957 [Erratum ibid. 81 (2021) 29] [Erratum ibid. 81 (2021) 398] [arXiv:2004.03447] [INSPIRE].
CMS collaboration, Measurements of the Higgs boson width and anomalous HVV couplings from on-shell and off-shell production in the four-lepton final state, Phys. Rev. D 99 (2019) 112003 [arXiv:1901.00174] [INSPIRE].
CMS collaboration, Analysis of the CP structure of the Yukawa coupling between the Higgs boson and τ leptons in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Tech. Rep. CMS-PAS-HIG-20-006, CERN, Geneva (2020).
ATLAS collaboration, CP Properties of Higgs Boson Interactions with Top Quarks in the t\( \overline{t} \)H and tH Processes Using H → γγ with the ATLAS Detector, Phys. Rev. Lett. 125 (2020) 061802 [arXiv:2004.04545] [INSPIRE].
CMS collaboration, Measurements of t\( \overline{\mathrm{t}} \)H Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel, Phys. Rev. Lett. 125 (2020) 061801 [arXiv:2003.10866] [INSPIRE].
A.V. Manohar and M.B. Wise, Heavy quark physics, Cambridge University Press (2000) [DOI].
A.F. Falk and M.E. Peskin, Production, decay, and polarization of excited heavy hadrons, Phys. Rev. D 49 (1994) 3320 [hep-ph/9308241] [INSPIRE].
Y. Grossman and D. Pirjol, Extracting and using photon polarization information in radiative B decays, JHEP 06 (2000) 029 [hep-ph/0005069] [INSPIRE].
ALEPH collaboration, Measurement of the Λb polarization in Z decays, Phys. Lett. B 365 (1996) 437 [INSPIRE].
OPAL collaboration, Measurement of the average polarization of b baryons in hadronic Z0 decays, Phys. Lett. B 444 (1998) 539 [hep-ex/9808006] [INSPIRE].
DELPHI collaboration, Λb polarization in Z0 decays at LEP, Phys. Lett. B 474 (2000) 205 [INSPIRE].
M. Galanti, A. Giammanco, Y. Grossman, Y. Kats, E. Stamou and J. Zupan, Heavy baryons as polarimeters at colliders, JHEP 11 (2015) 067 [arXiv:1505.02771] [INSPIRE].
R. Kleiss and W.J. Stirling, Spinor Techniques for Calculating p\( \overline{p} \) → W±/Z0 + Jets, Nucl. Phys. B 262 (1985) 235 [INSPIRE].
R. Kleiss and W.J. Stirling, Top quark production at hadron colliders: Some useful formulae, Z. Phys. C 40 (1988) 419 [INSPIRE].
N. Arkani-Hamed, T.-C. Huang and Y.-t. Huang, Scattering Amplitudes For All Masses and Spins, arXiv:1709.04891 [INSPIRE].
DELPHI collaboration, A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole, Eur. Phys. J. C 71 (2011) 1557 [arXiv:1102.4748] [INSPIRE].
J.D. Bjorken, Spin Dependent Decays of the Λc, Phys. Rev. D 40 (1989) 1513 [INSPIRE].
M. Jezabek, K. Rybicki and R. Rylko, Experimental study of spin effects in hadroproduction and decay of \( {\Lambda}_c^{+} \), Phys. Lett. B 286 (1992) 175 [INSPIRE].
Heavy Flavor Averaging Group (HFAG) collaboration, Averages of b-hadron, c-hadron, and τ-lepton properties as of summer 2014, arXiv:1412.7515 [INSPIRE].
ALEPH collaboration, Study of charm production in Z decays, Eur. Phys. J. C 16 (2000) 597 [hep-ex/9909032] [INSPIRE].
A. Abada et al. (FCC Collaboration), FCC-hh: The Hadron Collider, Eur. Phys. Jour. Sp. Top. 228 (2019) 755.
R. Contino et al., Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies, arXiv:1606.09408 [INSPIRE].
Particle Data Group collaboration, Review of Particle Physics, PTEP 2020 (2020) 083C01 [INSPIRE].
A. Abada et al. (FCC Collaboration), FCC-ee: The Lepton Collider, Eur. Phys. Jour. Sp. Top. 228 (2019) 261.
V.N. Litvinenko, T. Roser and M. Chamizo-Llatas, High-energy high-luminosity e+e− collider using energy-recovery linacs, Phys. Lett. B 804 (2020) 135394.
J.P. Delahaye et al., Muon Colliders, arXiv:1901.06150 [INSPIRE].
H. Al Ali et al., The Muon Smasher’s Guide, arXiv:2103.14043 [INSPIRE].
A. Costantini et al., Vector boson fusion at multi-TeV muon colliders, JHEP 09 (2020) 080 [arXiv:2005.10289] [INSPIRE].
ALEPH collaboration, Measurement of the B baryon lifetime and branching fractions in Z decays, Eur. Phys. J. C 2 (1998) 197 [INSPIRE].
DELPHI collaboration, Measurement of the lifetime of b - baryons, Eur. Phys. J. C 10 (1999) 185 [INSPIRE].
OPAL collaboration, Measurement of the average b-baryon lifetime and the product branching ratio f(b → Λb) · BR(Λb → Λℓ−\( \overline{\nu} \)X), Z. Phys. C 69 (1996) 195 [INSPIRE].
ATLAS collaboration, Observation of H → b\( \overline{b} \) decays and VH production with the ATLAS detector, Phys. Lett. B 786 (2018) 59 [arXiv:1808.08238] [INSPIRE].
CMS collaboration, Observation of Higgs boson decay to bottom quarks, Phys. Rev. Lett. 121 (2018) 121801 [arXiv:1808.08242] [INSPIRE].
P. Azzi et al., Prospective Studies for LEP3 with the CMS Detector, arXiv:1208.1662 [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
T. Sjöstrand, S. Mrenna and P. Skands, PYTHIA 6.4 physics and manual, Jour. High En. Phys. 05 (2006) 026.
M. Feindt, B quark fragmentation, in 30th Rencontres de Moriond: QCD and High-energy Hadronic Interactions, (1995) CERN-PPE-95-76.
T. Mannel, W. Roberts and Z. Ryzak, A Derivation of the heavy quark effective Lagrangian from QCD, Nucl. Phys. B 368 (1992) 204 [INSPIRE].
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
ArXiv ePrint: 2105.06879
Rights and permissions
Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Alonso, R., Fraser-Taliente, C., Hays, C. et al. Prospects for direct CP tests of hqq interactions. J. High Energ. Phys. 2021, 167 (2021). https://doi.org/10.1007/JHEP08(2021)167
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP08(2021)167