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Title: Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at $$\sqrt{s}$$=8 TeV

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 . 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 . The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling. 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 .

Authors:
 [1]
  1. Yerevan Physics Inst. (YerPhI) (Armenia). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1197753
Alternate Identifier(s):
OSTI ID: 1234839
Report Number(s):
FERMILAB-PUB-14-322-CMS; CERN-PH-EP-2014-190; CMS-EXO-12-032
Journal ID: ISSN 0370-2693; arXiv eprint number arXiv:1408.0806
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 739; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
CMS; physics; leptoquark; top squark

Citation Formats

Khachatryan, Vardan. Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at $\sqrt{s}$=8 TeV. United States: N. p., 2014. Web. doi:10.1016/j.physletb.2014.10.063.
Khachatryan, Vardan. Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at $\sqrt{s}$=8 TeV. United States. doi:10.1016/j.physletb.2014.10.063.
Khachatryan, Vardan. Thu . "Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at $\sqrt{s}$=8 TeV". United States. doi:10.1016/j.physletb.2014.10.063.
@article{osti_1197753,
title = {Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at $\sqrt{s}$=8 TeV},
author = {Khachatryan, Vardan},
abstractNote = {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 . 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 . The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling. 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 .},
doi = {10.1016/j.physletb.2014.10.063},
journal = {Physics Letters. Section B},
number = ,
volume = 739,
place = {United States},
year = {2014},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2014.10.063

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