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Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s=13 TeV with the ATLAS detector

Aaboud, M. ; Kastanas, Konstatinos A. ; Lund-Jensen, Bengt ; Ohm, Christian ; Ripellino, Giulia ; Sidebo, P. Edvin ; Strandberg, Jonas ; Zwalinski, L. ; et al

The journal of high energy physics, 2019 (5) [Periódico revisado por pares]

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Título:
Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s=13 TeV with the ATLAS detector
Autor: Aaboud, M. ; Kastanas, Konstatinos A. ; Lund-Jensen, Bengt ; Ohm, Christian ; Ripellino, Giulia ; Sidebo, P. Edvin ; Strandberg, Jonas ; Zwalinski, L. ; et al
Assuntos: 1991 ; 2004 ; 2016 ; 2017 ; ACTA PHYSICA POLONICA BMeeting on Particle Physics Phenomenology at High Energy Colliders ; boud M ; d G ; EUROPEAN PHYSICAL JOURNAL C ; FRANCE ; Hadron-Hadron scattering (experiments) ; JOURNAL OF HIGH ENERGY PHYSICS ; Montpellier ; NNER A ; NUCLEAR PHYSICS B ; P1 d G ; P2695 ; P46 boud M. yy ; PHYSICS LETTERS B ; Rare decay ; SEP 26-27 ; son P ; Top physics ; uilar-Saavedra JA ; V35 ; V358 ; V76 ; V762 ; V77
É parte de: The journal of high energy physics, 2019 (5)
Descrição: A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t Hq, is presented. The search is based on a dataset of pp collisions at = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb(-1). Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the Hbb and H (+-) decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying -leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t Hc and t Hu branching ratios of 1.1 x 10(-3) (8.3 x 10(-4)) and 1.2 x 10(-3) (8.3 x 10(-4)), respectively. The corresponding combined observed (expected) upper limits on the |(tcH)| and |(tuH)| couplings are 0.064 (0.055) and 0.066 (0.055), respectively.
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Search for top-quark decays t -> Hq with 36 fb(-1) of pp collision data at root s=13 TeV with the ATLAS detector

Aaboud, M. ; Kastanas, Konstatinos A. ; Lund-Jensen, Bengt ; Ohm, Christian ; Ripellino, Giulia ; Sidebo, P. Edvin ; Strandberg, Jonas ; Zwalinski, L. ; et al

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