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  4. Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at $\sqrt{s}=$ 13 TeV
 
research article

Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at $\sqrt{s}=$ 13 TeV

Sirunyan, Albert M
•
Tumasyan, Armen
•
Adam, Wolfgang
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August 11, 2018
Physical Review D

The results of a previous search by the CMS Collaboration for squarks and gluinos are reinterpreted to constrain models of leptoquark (LQ) production. The search considers jets in association with a transverse momentum imbalance, using the MT2 variable. The analysis uses proton-proton collision data at s=13  TeV, recorded with the CMS detector at the LHC in 2016 and corresponding to an integrated luminosity of 35.9  fb-1. Leptoquark pair production is considered with LQ decays to a neutrino and a top, bottom, or light quark. This reinterpretation considers higher mass values than the original CMS search to constrain both scalar and vector LQs. Limits on the cross section for LQ pair production are derived at the 95% confidence level depending on the LQ decay mode. A vector LQ decaying with a 50% branching fraction to tν, and 50% to bτ, has been proposed as part of an explanation of anomalous flavor physics results. In such a model, using only the decays to tν, LQ masses below 1530 GeV are excluded assuming the Yang-Mills case with coupling κ=1, or 1115 GeV in the minimal coupling case κ=0, placing the most stringent constraint to date from pair production of vector LQs.

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Type
research article
DOI
10.1103/PhysRevD.98.032005
ArXiv ID

1805.10228

Author(s)
Sirunyan, Albert M
Tumasyan, Armen
Adam, Wolfgang
Ambrogi, Federico
Asilar, Ece
Bergauer, Thomas
Brandstetter, Johannes
Dragicevic, Marko
Erö, Janos
Escalante Del Valle, Alberto
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Date Issued

2018-08-11

Publisher

American Physical Society

Published in
Physical Review D
Volume

98

Issue

3

Article Number

032005

Subjects

p p: colliding beams

•

leptoquark: pair production

•

model: scalar

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model: vector

•

p p: scattering

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CMS

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leptoquark: scalar

•

leptoquark: vector particle

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transverse momentum: missing-energy

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final state: ((n)jet)

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leptoquark: branching ratio

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CERN LHC Coll

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leptoquark: decay modes

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gluino

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squark

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flavor

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channel cross section: upper limit

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leptoquark: mass: lower limit

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experimental results

•

13000 GeV-cms

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LPHE  
Available on Infoscience
February 17, 2020
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/166196
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