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

Author(s)
Apyan, Aram; Barbieri, Richard Alexander; Baty, Austin Alan; Bierwagen, Katharina; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey, P. David, Jr.; McGinn, Christopher Francis; Niu, Xinmei; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Sumorok, Konstanty C.; Varma, Mukund; Velicanu, Dragos Alexandru; Veverka, Jan; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Mingming; Zhukova, Victoria; ... Show more Show less
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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 corresponding to an integrated luminosity of 19.7 fb[superscript −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 applied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling λ [subscript 333] ′.
Date issued
2015-07
URI
http://hdl.handle.net/1721.1/98261
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, et al. “Search for Third-Generation Scalar Leptoquarks in the Tτ Channel in Proton-Proton Collisions at √s = 8 TeV.” J. High Energ. Phys. 2015, no. 7 (July 2015). © 2015 CERN, for the benefit of the CMS Collaboration
Version: Final published version
ISSN
1029-8479
1126-6708

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