Search for heavy neutrinos or third-generation leptoquarks in final states with two hadronically decaying τ leptons and two jets in proton-proton collisions at √s=13 TeV
A search for new particles has been conducted using events with two high transverse momentum (pT) τ leptons that decay hadronically, at least two high-pT jets, and missing transverse energy from the τ lepton decays. The analysis is performed using data from proton-proton collisions, collected by...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63074/1/63074_Search%20for%20heavy%20neutrinos_article.pdf http://irep.iium.edu.my/63074/2/63074_Search%20for%20heavy%20neutrinos_scopus.pdf http://irep.iium.edu.my/63074/ https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.119.221802 |
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| Institution: | Universiti Islam Antarabangsa Malaysia |
| Language: | English English |
| Summary: | A search for new particles has been conducted using events with two high
transverse momentum (pT) τ leptons that decay hadronically, at least two high-pT jets, and
missing transverse energy from the τ lepton decays. The analysis is performed using data
from proton-proton collisions, collected by the CMS experiment in 2015 at √
s = 13 TeV,
corresponding to an integrated luminosity of 2.1 fb−1
. The results are interpreted in two
physics models. The first model involves heavy right-handed neutrinos, N` (` = e, µ, τ ),
and right-handed charged bosons, WR, arising in a left-right symmetric extension of the
standard model. Masses of the WR boson below 2.35 (1.63) TeV are excluded at 95%
confidence level, assuming the Nτ mass is 0.8 (0.2) times the mass of the WR boson and that
only the Nτ flavor contributes to the WR decay width. In the second model, pair production
of third-generation scalar leptoquarks that decay into τ τbb is considered. Third-generation
scalar leptoquarks with masses below 740 GeV are excluded, assuming a 100% branching
fraction for the leptoquark decay to a τ lepton and a bottom quark. This is the first search
at hadron colliders for the third-generation Majorana neutrino, as well as the first search
for third-generation leptoquarks in the final state with a pair of hadronically decaying τ
leptons and jets. |
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