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Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √ s=8 TeV

Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √ s=8 TeV
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. 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 |λtcH|2 < 6.9 × 10− 3 and |λtuH|2 < 9.8 × 10− 3.
1029-8479
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
The CMS Collaboration
Khachatryan, Vardan
375bcfe5-df1a-41ad-9a90-553e557ef6d6
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

The CMS Collaboration (2017) Search for top quark decays via Higgs-boson-mediated flavor-changing neutral currents in pp collisions at √ s=8 TeV. Journal of High Energy Physics, 02, [079]. (doi:10.1007/JHEP02(2017)079).

Record type: Article

Abstract

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 |λtcH|2 < 6.9 × 10− 3 and |λtuH|2 < 9.8 × 10− 3.

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More information

Accepted/In Press date: 1 February 2017
e-pub ahead of print date: 15 February 2017
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 407804
URI: http://eprints.soton.ac.uk/id/eprint/407804
ISSN: 1029-8479
PURE UUID: 9b5f9e71-fe05-4255-b284-b8dbee710d78
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 26 Apr 2017 01:10
Last modified: 07 Oct 2020 01:53

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