Search for pair production of first and second generation leptoquarks in proton-proton collisions at sqrt(s) = 8 TeV

TL;DR

This paper reports a search for first and second generation leptoquarks in proton-proton collisions at 8 TeV, setting new mass exclusion limits and exploring related supersymmetric scenarios using CMS data.

Contribution

It provides the most stringent limits to date on leptoquark and RPV top squark masses using CMS data at 8 TeV.

Findings

Excluded first-generation scalar leptoquarks below 1010 GeV for beta=1.0

Excluded second-generation scalar leptoquarks below 1080 GeV for beta=1.0

Set mass limits for vector leptoquarks and RPV top squarks

Abstract

A search for pair production of first and second generation leptoquarks is performed in final states containing either two charged leptons and two jets, or one charged lepton, one neutrino and two jets, using proton-proton collision data at sqrt(s) = 8 TeV. The data, corresponding to an integrated luminosity of 19.7 inverse femtobarns were recorded with the CMS detector at the LHC. First-generation scalar leptoquarks with masses less than 1010 (850) GeV are excluded for beta = 1.0 (0.5), where beta is the branching fraction of a leptoquark decaying to a charged lepton and a quark. Similarly, second-generation scalar leptoquarks with masses less than 1080 (760) GeV are excluded for beta = 1.0 (0.5). Mass limits are also set for vector leptoquark production scenarios with anomalous vector couplings, and for R-parity violating supersymmetric scenarios of top squark pair production resulting in similar final-state signatures. These are the most stringent limits placed on the masses of leptoquarks and RPV top squarks to date.