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Title: Search for Third-Generation Scalar Leptoquarks in the t$$\tau$$ Channel in Proton-Proton Collisions at $$\sqrt{s}$$ = 8 TeV

Abstract

A search for pair production of third-generation scalar leptoquarks decaying to top quark and $$\tau$$ lepton pairs is presented using proton-proton collision data at a center-of-mass energy of $$\sqrt{s}$$ = 8 TeV collected with the CMS detector at the LHC and corresponding 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 $$\tau$$ 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 $$\tau$$ 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 $$\tau$$ lepton, and may also be applied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling λ' 333.

Authors:
Publication Date:
Research Org.:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
CMS Collaboration
OSTI Identifier:
1212731
Report Number(s):
FERMILAB-PUB-15-109-CMS; CERN-PH-EP-2015-063; CMS-EXO-14-008
Journal ID: ISSN 1029-8479; arXiv eprint number arXiv:1503.09049; TRN: US1500634
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2015; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Experiment-HEP

Citation Formats

Khachatryan, V. Search for Third-Generation Scalar Leptoquarks in the t$\tau$ Channel in Proton-Proton Collisions at $\sqrt{s}$ = 8 TeV. United States: N. p., 2015. Web. doi:10.1007/JHEP07(2015)042.
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Khachatryan, V. Search for Third-Generation Scalar Leptoquarks in the t$\tau$ Channel in Proton-Proton Collisions at $\sqrt{s}$ = 8 TeV. United States. https://doi.org/10.1007/JHEP07(2015)042
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Khachatryan, V. Thu . "Search for Third-Generation Scalar Leptoquarks in the t$\tau$ Channel in Proton-Proton Collisions at $\sqrt{s}$ = 8 TeV". United States. https://doi.org/10.1007/JHEP07(2015)042. https://www.osti.gov/servlets/purl/1212731.
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@article{osti_1212731,
title = {Search for Third-Generation Scalar Leptoquarks in the t$\tau$ Channel in Proton-Proton Collisions at $\sqrt{s}$ = 8 TeV},
author = {Khachatryan, V.},
abstractNote = {A search for pair production of third-generation scalar leptoquarks decaying to top quark and $\tau$ lepton pairs is presented using proton-proton collision data at a center-of-mass energy of $\sqrt{s}$ = 8 TeV collected with the CMS detector at the LHC and corresponding 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 $\tau$ 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 $\tau$ 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 $\tau$ lepton, and may also be applied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling λ' 333.},
doi = {10.1007/JHEP07(2015)042},
journal = {Journal of High Energy Physics (Online)},
number = 7,
volume = 2015,
place = {United States},
year = {Thu Jul 09 00:00:00 EDT 2015},
month = {Thu Jul 09 00:00:00 EDT 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1007/JHEP07(2015)042
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Cited by: 17 works
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Figures / Tables:

Figure 1 Figure 1: One of the $LQ$3$\overline{LQ_3}$ decay chains with both same-sign and opposite-sign $ℓτ$h pairs. Labels u and d denote up and down type quarks, and $ℓ$ denotes an electron or a muon.
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    Works referencing / citing this record:

    R -parity violating solutions to the R D ( * ) anomaly and their GUT-scale unifications
    journal, January 2019

    Review of searches for rare processes and physics beyond the Standard Model at HERA
    journal, June 2016

    B-decay anomalies in a composite leptoquark model
    journal, December 2016

    Search for third-generation scalar leptoquarks decaying to a top quark and a $$\tau $$ τ lepton at $$\sqrt{s}=13\,\text {Te}\text {V} $$ s = 13 Te
    journal, September 2018

    Review of searches for rare processes and physics beyond the Standard Model at HERA
    text, January 2016

    Search for Leptoquarks Coupled to Third-Generation Quarks in Proton-Proton Collisions at √s =13 TeV
    text, January 2018

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      Figures / Tables found in this record:

      Figure 1 (p. 4)figure
      Table 1 (p. 6)table
      Figure 2 (p. 9)figure
      Figure 3 (p. 9)figure
      Table 2 (p. 14)table
      Table 3 (p. 16)table
      Table 4 (p. 17)table
      Table 5 (p. 18)table
      Figure 4 (p. 19)figure
      Figure 5 (p. 20)figure
      Figure 6 (p. 21)figure
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