Search for leptoquarks coupling to third-generation quarks and first- or second-generation leptons at 13.6 TeV

CMS Physics Analysis Summaries
Report number	CMS-PAS-B2G-25-011
Title	Search for leptoquarks coupling to third-generation quarks and first- or second-generation leptons at 13.6 TeV
Corporate author(s)	CMS Collaboration
Collaboration	CMS Collaboration
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	A search for pair production of scalar leptoquarks with Yukawa couplings to a third-generation quark and a first- or second-generation lepton is presented. The analysis uses a data sample corresponding to an integrated luminosity of $220$ fb$^{-1}$ of proton-proton collisions at $\sqrt{s} = 13.6$ TeV recorded by the CMS detector at the LHC in 2024--2025. The search targets events with at least one charged lepton, at least one b-tagged jet, and additional hadronic activity consistent with hadronic top-quark decays. No significant deviation from the background expectation is observed. The results are interpreted in terms of scalar leptoquarks decaying to a top quark and a charged lepton, or to a bottom quark and a neutrino, with a branching ratio that depends on the coupling type. Such scalar particles are excluded at $95\%$ confidence level for masses below 1720 and 1860 GeV in the electron channel, and below 1760 and 1890 GeV in the muon channel, for left- and right-handed Yukawa couplings, respectively. These constraints are the most stringent to date.
Other source	Inspire
Email contact: cms-pag-conveners-b2g@cern.ch Fulltext in PDF Figure_003-a Figure_008-b Figure_007-d Figure_008-a Figure_007-a Figure_006-a Figure_006-b Figure_003-b Figure_004-b Figure_002-a Figure_002-b Figure_004-a Figure_007-c Figure_005-b Figure_005-a Figure_001-d Figure_001-c Figure_001-b Figure_001-a Figure_007-b Additional information for the analysis (restricted access)