Measurement of ttH production cross section times branching ratio in the γγ decay channel with the full Run2 pp collision dataset collected by the ATLAS experiment at √s = 13 TeV

Mungo, D. P. (2020) Measurement of ttH production cross section times branching ratio in the γγ decay channel with the full Run2 pp collision dataset collected by the ATLAS experiment at √s = 13 TeV. Il nuovo cimento C, 43 (2-3). pp. 1-3. ISSN 1826-9885

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Abstract

In this study, the measurement of Higgs boson production in association with a top quark-antiquark pair in the two photons decay channel is presented. The analysis is based on 139 fb−1 of proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider at center-of-mass energy of √s = 13 TeV. The analysis is performed using a simultaneous fit in seven signalenriched event categories. The ttH¯ process is observed in the diphoton decay channel with a significance of 4.9σ relative to the background-only hypothesis, while the expected significance is 4.2σ. The ttH¯ cross-section times the H → γγ branching ratio is measured to be σttH¯ ×Bγγ = 1.59+0.43 −0.39 fb, in agreement with the Standard Model prediction.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	16 Mar 2021 15:27
Last Modified:	16 Mar 2021 15:27
URI:	http://eprints.bice.rm.cnr.it/id/eprint/20818

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