# 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 07 Faculty of Science > Physics Institute 530 Physics Physical Sciences > Physics and Astronomy (miscellaneous) English 2018 15 Feb 2019 11:20 13 May 2020 22:35 American Physical Society 1550-7998 Green https://doi.org/10.1103/PhysRevD.98.032005

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