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Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at √s = 8TeV

Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at √s = 8TeV
Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at √s = 8TeV
A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton–proton collisions corresponding to an integrated luminosity of 19.7 fb−1, collected with the CMS detector at the LHC with √s = 8TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling λ'333. The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling λ'3jk. Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via λ'3jk.
0370-2693
229-249
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2014) Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at √s = 8TeV. Physics Letters B, 739, 229-249. (doi:10.1016/j.physletb.2014.10.063).

Record type: Article

Abstract

A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton–proton collisions corresponding to an integrated luminosity of 19.7 fb−1, collected with the CMS detector at the LHC with √s = 8TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling λ'333. The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling λ'3jk. Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via λ'3jk.

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Published date: 2014
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 411200
URI: http://eprints.soton.ac.uk/id/eprint/411200
ISSN: 0370-2693
PURE UUID: 787be5f8-fccb-4671-a074-a74ba4375181
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

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Date deposited: 15 Jun 2017 16:31
Last modified: 05 Nov 2019 01:46

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