Measurement of the t¯tH and tH production rates in the H→ b¯b decay channel using proton-proton collision data at Vs= 13 TeV

An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (t¯tH) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H → b¯b) is targeted, and three different final states of the top quark decays are considered, d...

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Authors: Hayrapetyan, A., Bhowmik, Sandeep, Blanco Fernández, Sergio, Brochero Cifuentes, Javier Andrés|||0000-0003-2093-7856, Cabrillo Bartolomé, José Ibán, Calderón Tazón, Alicia|||0000-0002-7205-2040, Duarte Campderros, Jorge|||0000-0003-0687-5214, Fernández García, Marcos|||0000-0002-4824-1087, Gómez Gramuglio, Gervasio|||0000-0002-1077-6553, Lasaosa García, Clara, López Ruiz, Rubén, Martínez Rivero, Celso, Martínez Ruiz del Árbol, Pablo|||0000-0002-7737-5121, Matorras Weinig, Francisco|||0000-0003-4295-5668, Matorras Cuevas, Pablo|||0000-0001-7481-7273, Navarrete Ramos, Efrén|||0000-0002-5180-4020, Piedra Gómez, Jonatan|||0000-0002-9157-1700, Scodellaro, Luca|||0000-0002-4974-8330, Vila Álvarez, Iván|||0000-0002-6797-7209, Vizán García, Jesús Manuel|||0000-0002-6823-8854
Format: article
Publication Date:2025
Country:España
Institution:Universidad de Cantabria (UC)
Repository:UCrea Repositorio Abierto de la Universidad de Cantabria
Language:English
OAI Identifier:oai:repositorio.unican.es:10902/38541
Online Access:https://hdl.handle.net/10902/38541
Access Level:Open access
Keyword:Hadron-hadron scattering
Higgs physics
Top physics
Description
Summary:An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (t¯tH) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H → b¯b) is targeted, and three different final states of the top quark decays are considered, defined by the number of leptons (electrons or muons) in the event. The analysis utilises proton-proton collision data collected at the CERN LHC with the CMS experiment at Vs = 13TeV in 2016-2018, which correspond to an integrated luminosity of 138 fb-1. The observed t¯tH production rate relative to the standard model expectation is 0.33 ± 0.26 = 0.33 ± 0.17(stat) ± 0.21(syst). Additionally, the t¯tH production rate is determined in intervals of Higgs boson transverse momentum. An upper limit at 95% confidence level is set on the tH production rate of 14.6 times the standard model prediction, with an expectation of 19.3+9.2-6.0. Finally, constraints are derived on the strength and structure of the coupling between the Higgs boson and the top quark from simultaneous extraction of the t¯tH and tH production rates, and the results are combined with those obtained in other Higgs boson decay channels.

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