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


CMS Collaboration,; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Brzhechko, Danyyl; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Mikuni, Vinicius Massami; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto (2018). Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at $\sqrt s$ = 13 TeV. Physical Review. D, Particles, fields, gravitation and cosmology, D98(3):032005.

Abstract

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 $M_{T2}$ variable. The analysis uses proton-proton collision data at $\sqrt s$ = 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 $b_T$, 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.

Abstract

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 $M_{T2}$ variable. The analysis uses proton-proton collision data at $\sqrt s$ = 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 $b_T$, 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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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:15 Feb 2019 11:20
Last Modified:24 Sep 2019 23:59
Publisher:American Physical Society
ISSN:1550-7998
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevD.98.032005

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