Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √s=8 TeV
A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data corresponding to an integrated luminosity of 19.7 fb−1 at a center-of-mass energy of 8 TeV collected with the CMS detector at the LHC. Ev...
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| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
Springer Verlag
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/63127/1/63127_Search%20for%20top%20quark%20decays%20via%20Higgs-boson_article.pdf http://irep.iium.edu.my/63127/2/63127_Search%20for%20top%20quark%20decays%20via%20Higgs-boson_scopus.pdf http://irep.iium.edu.my/63127/ https://link.springer.com/content/pdf/10.1007%2FJHEP07%282017%29121.pdf |
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| Summary: | A search is performed for Higgs-boson-mediated flavor-changing neutral currents in the decays of top quarks. The search is based on proton-proton collision data
corresponding to an integrated luminosity of 19.7 fb−1 at a center-of-mass energy of 8 TeV
collected with the CMS detector at the LHC. Events in which a top quark pair is produced
with one top quark decaying into a charm or up quark and a Higgs boson (H), and the
other top quark decaying into a bottom quark and a W boson are selected. The Higgs
boson in these events is assumed to subsequently decay into either dibosons or difermions.
No significant excess is observed above the expected standard model background, and an
upper limit at the 95% confidence level is set on the branching fraction B (t → Hc) of 0.40%
and B (t → Hu) of 0.55%, where the expected upper limits are 0.43% and 0.40%, respectively. These results correspond to upper limits on the square of the flavor-changing Higgs
boson Yukawa couplings |λ
H
tc|
2 < 6.9 × 10−3 and |λ
H
tu|
2 < 9.8 × 10−3 |
|---|