Search for third-generation scalar leptoquarks in the tτ channel in proton-proton collisions at √s = 8 TeV

Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Asilar, E. and Filipovic, Nicolas and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Karancsi, János and Molnár, József and Pálinkás, József and Bartók, Márton and Makovec, Alajos and Trócsányi, Zoltán and Veres, Gábor (2015) Search for third-generation scalar leptoquarks in the tτ channel in proton-proton collisions at √s = 8 TeV. JOURNAL OF HIGH ENERGY PHYSICS (7). ISSN 1126-6708

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Abstract

A search for pair production of third-generation scalar leptoquarks decaying to top quark and τ lepton pairs is presented using proton-proton collision data at a center- of-mass energy of √s = 8 TeV collected with the CMS detector at the LHC and cor- responding to an integrated luminosity of 19.7 fb−1. The search is performed using events that contain an electron or a muon, a hadronically decaying τ lepton, and two or more jets. The observations are found to be consistent with the standard model predictions. Assuming that all leptoquarks decay to a top quark and a τ lepton, the existence of pair produced, charge −1/3, third-generation leptoquarks up to a mass of 685 GeV is excluded at 95% confidence level. This result constitutes the first direct limit for leptoquarks decaying into a top quark and a τ lepton, and may also be ap- plied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling λ′ 333.

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