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Title: Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $$\tau$$ leptons and two jets in proton-proton collisions at $$\sqrt{s} =$$ 13 TeV

Abstract

A search for new particles has been conducted using events with two high transverse momentum $$\tau$$ leptons that decay hadronically and at least two energetic jets. The analysis is performed using data from proton-proton collisions at $$\sqrt{s}=$$ 13 TeV, collected by the CMS experiment at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$$^{-1}$$. The observed data are consistent with standard model expectations. The results are interpreted in the context of two physics models. The first model involves right-handed charged bosons, W$$_\mathrm{R}$$, that decay to heavy right-handed Majorana neutrinos, N$$_\ell$$ $$(\ell= $$e, $$\mu,\tau)$$, arising in a left-right symmetric extension of the standard model. The model considers that N$$_\mathrm{e}$$ and N$$_\mu$$ are too heavy to be detected at the LHC. Assuming that the N$$_\tau$$ mass is half of the W$$_\mathrm{R}$$ mass, masses of the W$$_\mathrm{R}$$ boson below 3.50 TeV are excluded at 95% confidence level. Exclusion limits are also presented considering different scenarios for the mass ratio between N$$_\tau$$ and W$$_\mathrm{R}$$, as a function of W$$_\mathrm{R}$$ mass. In the second model, pair production of third-generation scalar leptoquarks that decay into $$\tau\tau$$bb is considered, resulting in an observed exclusion region with leptoquark masses below 1.02 TeV, assuming a 100% branching fraction for the leptoquark decay to a $$\tau$$ lepton and a bottom quark. These results represent the most stringent limits to date on these models.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
CMS
OSTI Identifier:
1484189
Report Number(s):
FERMILAB-PUB-18-642-CMS; arXiv:1811.00806; CMS-EXO-17-016; CERN-EP-2018-272
1701635
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
JHEP
Additional Journal Information:
Journal Name: JHEP
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Sirunyan, Albert M, and et al. Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV. United States: N. p., 2018. Web.
Sirunyan, Albert M, & et al. Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV. United States.
Sirunyan, Albert M, and et al. Fri . "Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV". United States. https://www.osti.gov/servlets/purl/1484189.
@article{osti_1484189,
title = {Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s} =$ 13 TeV},
author = {Sirunyan, Albert M and et al.},
abstractNote = {A search for new particles has been conducted using events with two high transverse momentum $\tau$ leptons that decay hadronically and at least two energetic jets. The analysis is performed using data from proton-proton collisions at $\sqrt{s}=$ 13 TeV, collected by the CMS experiment at the LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The observed data are consistent with standard model expectations. The results are interpreted in the context of two physics models. The first model involves right-handed charged bosons, W$_\mathrm{R}$, that decay to heavy right-handed Majorana neutrinos, N$_\ell$ $(\ell= $e, $\mu,\tau)$, arising in a left-right symmetric extension of the standard model. The model considers that N$_\mathrm{e}$ and N$_\mu$ are too heavy to be detected at the LHC. Assuming that the N$_\tau$ mass is half of the W$_\mathrm{R}$ mass, masses of the W$_\mathrm{R}$ boson below 3.50 TeV are excluded at 95% confidence level. Exclusion limits are also presented considering different scenarios for the mass ratio between N$_\tau$ and W$_\mathrm{R}$, as a function of W$_\mathrm{R}$ mass. In the second model, pair production of third-generation scalar leptoquarks that decay into $\tau\tau$bb is considered, resulting in an observed exclusion region with leptoquark masses below 1.02 TeV, assuming a 100% branching fraction for the leptoquark decay to a $\tau$ lepton and a bottom quark. These results represent the most stringent limits to date on these models.},
doi = {},
journal = {JHEP},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {11}
}