Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at s =13 TeV
Three of the most significant measured deviations from standard model predictions, the enhanced decay rate for B → DðÞτν, hints of lepton universality violation in B → KðÞll decays, and the anomalous magnetic moment of the muon, can be explained by the existence of leptoquarks (LQs) with large cou...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70721/ http://irep.iium.edu.my/70721/ http://irep.iium.edu.my/70721/ http://irep.iium.edu.my/70721/1/70721_Search%20for%20Leptoquarks%20Coupled%20to%20Third-Generation_article.pdf http://irep.iium.edu.my/70721/2/70721_Search%20for%20Leptoquarks%20Coupled%20to%20Third-Generation_scopus.pdf |
| Summary: | Three of the most significant measured deviations from standard model predictions, the enhanced decay
rate for B → DðÞτν, hints of lepton universality violation in B → KðÞll decays, and the anomalous
magnetic moment of the muon, can be explained by the existence of leptoquarks (LQs) with large couplings
to third-generation quarks and masses at the TeV scale. The existence of these states can be probed at the
LHC in high energy proton-proton collisions. A novel search is presented for pair production of LQs
coupled to a top quark and a muon using data at a center-of-mass energy of 13 TeV, corresponding to an
integrated luminosity of 35.9 fb−1, recorded by the CMS experiment. No deviation from the standard
model prediction has been observed and scalar LQs decaying exclusively into tμ are excluded up to masses
of 1420 GeV. The results of this search are combined with those from previous searches for LQ decays into
tτ and bν, which excluded scalar LQs below masses of 900 and 1080 GeV. Vector LQs are excluded up to
masses of 1190 GeV for all possible combinations of branching fractions to tμ, tτ and bν. With this
analysis, all relevant couplings of LQs with an electric charge of −1=3 to third-generation quarks are
probed for the first time. |
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