Searches for violation of Lorentz invariance in top quark pair production using dilepton events in 13 TeV proton-proton collisions
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Published version
Author(s)
Type
Journal Article
Abstract
A search for violation of Lorentz invariance in the production of top quark pairs (tt) is presented. The measured
normalized differential tt production cross section, as a function of the sidereal time, is examined for potential
modulations induced by Lorentz-invariance breaking operators in an effective field theory extension of the
standard model (SM). The cross section is measured from collision events collected by the CMS detector at a
center-of-mass-energy of 13 TeV, corresponding to an integrated luminosity of 77.8 fb−1, and containing one
electron and one muon. The results are found to be compatible with zero, in agreement with the SM, and are
used to place upper limits at 68% confidence level on the magnitude of the Lorentz-violating couplings ranging
from 1–8 × 10−3. This is the first precision test of the isotropy in special relativity with top quarks at the LHC,
restricting further the bounds on such couplings by up to two orders of magnitude with respect to previous
searches conducted at the Tevatron.
normalized differential tt production cross section, as a function of the sidereal time, is examined for potential
modulations induced by Lorentz-invariance breaking operators in an effective field theory extension of the
standard model (SM). The cross section is measured from collision events collected by the CMS detector at a
center-of-mass-energy of 13 TeV, corresponding to an integrated luminosity of 77.8 fb−1, and containing one
electron and one muon. The results are found to be compatible with zero, in agreement with the SM, and are
used to place upper limits at 68% confidence level on the magnitude of the Lorentz-violating couplings ranging
from 1–8 × 10−3. This is the first precision test of the isotropy in special relativity with top quarks at the LHC,
restricting further the bounds on such couplings by up to two orders of magnitude with respect to previous
searches conducted at the Tevatron.
Date Issued
2024-10
Date Acceptance
2024-08-20
Citation
Physics Letters B, 2024, 857
ISSN
0370-2693
Publisher
Elsevier BV
Journal / Book Title
Physics Letters B
Volume
857
Copyright Statement
© 2024 CERN for the benefit of the CMS Collaboration. Published by Elsevier B.V. Funded by SCOAP³. This is an open access article under the CC BY
license (http://creativecommons.org/licenses/by/4.0/).
license (http://creativecommons.org/licenses/by/4.0/).
License URL
Identifier
https://doi.org/10.1016/j.physletb.2024.138979
Publication Status
Published
Article Number
138979
Date Publish Online
2024-08-23