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Search for single production of scalar leptoquarks in proton-proton collisions at s =8 TeV

par Khachatryan, Vardan;Barria, Patrizia ;Caillol, Cécile ;Clerbaux, Barbara ;De Lentdecker, Gilles ;Delannoy, Hugo ;Dobur, Didar ;Fasanella, Giuseppe ;Favart, Laurent ;Gay, Arnaud ;Grebenyuk, Anastasia ;Lenzi, Thomas ;Leonard, Alexandre ;Maerschalk, Thierry ;Mohammadi, Abdollah ;Pernie, Luca ;Randle-Conde, Aidan Sean ;Reis, Thomas ;Seva, Tomislav ;Thomas, Laurent ;Vander Velde, Catherine ;Vanlaer, Pascal ;Wang, Jian ;Zenoni, Florian ;Zhang, Fengwangdong ; [et al.]
Référence Physical Review D, 93, 3, 032005
Publication Publié, 2016

Article révisé par les pairs

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Résumé :

A search is presented for the production of both first- and second-generation scalar leptoquarks with a final state of either two electrons and one jet or two muons and one jet. The search is based on a data sample of proton-proton collisions at center-of-mass energy s=8 TeV recorded with the CMS detector and corresponding to an integrated luminosity of 19.6 fb-1. Upper limits are set on both the first- and second-generation leptoquark production cross sections as functions of the leptoquark mass and the leptoquark couplings to a lepton and a quark. Results are compared with theoretical predictions to obtain lower limits on the leptoquark mass. At 95% confidence level, single production of first-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 1730 GeV, and second-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 530 GeV. These are the best overall limits on the production of first-generation leptoquarks to date.