Search for a third-generation leptoquark coupled to a τ lepton and a b quark through single, pair, and nonresonant production in proton-proton collisions at $ \sqrt{s} $ = 13 TeV

Hayrapetyan, Aram; Tumasyan, Armen; Adam, Wolfgang; Andrejkovic, Janik Walter; Bergauer, Thomas; Chatterjee, Suman; Damanakis, Konstantinos; Dragicevic, Marko; Escalante Del Valle, Alberto; Hussain, Priya Sajid

doi:10.1007/JHEP05(2024)311

Search for a third-generation leptoquark coupled to a τ lepton and a b quark through single, pair, and nonresonant production in proton-proton collisions at $\sqrt{s}$ = 13 TeV

CMS

Collaboration

Aug 15, 2023

55 pages

Published in:

JHEP 05 (2024) 311

Published: May 28, 2024

e-Print:

2308.07826 [hep-ex]

DOI:

10.1007/JHEP05(2024)311 (publication)

Report number:

CMS-EXO-19-016,
CERN-EP-2023-144

Experiments:

CERN-LHC-CMS

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Abstract: (Springer)

A search is presented for a third-generation leptoquark (LQ) coupled exclusively to a τ lepton and a b quark. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV recorded with the CMS detector, corresponding to an integrated luminosity of 138 fb

^{−1}

. Events with τ leptons and a varying number of jets originating from b quarks are considered, targeting the single and pair production of LQs, as well as nonresonant t-channel LQ exchange. An excess is observed in the data with respect to the background expectation in the combined analysis of all search regions. For a benchmark LQ mass of 2 TeV and an LQ-b-τ coupling strength of 2.5, the excess reaches a local significance of up to 2.8 standard deviations. Upper limits at the 95% confidence level are placed on the LQ production cross section in the LQ mass range 0.5–2.3 TeV, and up to 3 TeV for t-channel LQ exchange. Leptoquarks are excluded below masses of 1.22–1.88 TeV for different LQ models and varying coupling strengths up to 2.5. The study of nonresonant ττ production through t-channel LQ exchange allows lower limits on the LQ mass of up to 2.3 TeV to be obtained.[graphic not available: see fulltext]

Note:

All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-19-016 (CMS Public Pages)

Beyond Standard Model
Hadron-Hadron Scattering
p p: scattering
p p: colliding beams
family: 3
leptoquark: mass
coupling constant
leptoquark: coupling
lepton quark
leptoquark: pair production

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