Searches for violation of Lorentz invariance in top quark pair production using dilepton events in 13 TeV proton-proton collisions

Abstract

A search for violation of Lorentz invariance in the production of top quark pairs ($\mathrm{t}\bar{\mathrm{t}}$) is presented. The measured normalized differential $\mathrm{t}\bar{\mathrm{t}}$ production cross section, as 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 $\times$ 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 two orders of magnitude with respect to previous searches conducted at the Tevatron.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-22-007 (CMS Public Pages)

References in corpus (34)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• Lorentz-Violating Extension of the Standard Model
• CPT Violation and the Standard Model
• Parton distributions from high-precision collider data
• Data Tables for Lorentz and CPT Violation
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• Particle-flow reconstruction and global event description with the CMS detector
• Nonstandard optics from quantum spacetime
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Event generator tunes obtained from underlying event and multiparton scattering measurements
• Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV
• Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements
• HATHOR for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions
• $W^{+}{W}^{-}$ production at hadron colliders in NNLO QCD
• Precision luminosity measurement in proton-proton collisions at $\sqrt{s}=$ 13 TeV in 2015 and 2016 at CMS
• Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC
• QCD radiation in the production of heavy colored particles at the LHC
• Measurement of the differential cross section for top quark pair production in pp collisions at sqrt(s) = 8 TeV
• Measurement of the $\mathrm{t}\overline{\mathrm{t}}$ production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at $\sqrt{s}=$ 13 TeV
• Charm System Tests of CPT and Lorentz Invariance with FOCUS
• Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment
• Search for violation of Lorentz invariance in top quark pair production and decay
• Lorentz and CPT Violation in Top-Quark Production and Decay
• Lifshitz-sector mediated SUSY breaking
• Search for Violation of $CPT$ and Lorentz invariance in $B_s^0$ meson oscillations
• Prospects for Lorentz Invariance Violation searches with top pair production at the LHC and future hadron colliders
• The Pixel Luminosity Telescope: A detector for luminosity measurement at CMS using silicon pixel sensors

Cited by in corpus (1)

• Probing Lorentz Invariance Violation in Z Boson Mass Measurements at High-Energy Colliders