Constraining the Higgs boson self-coupling with single-Higgs and double-Higgs production measurements

Rossi, E. (2020) Constraining the Higgs boson self-coupling with single-Higgs and double-Higgs production measurements. Il nuovo cimento C, 43 (2-3). pp. 1-3. ISSN 1826-9885

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Abstract

One of the most important targets of the LHC is to improve the experimental results of the Run 1 and the complete exploration of the properties of the Higgs boson, in particular the Higgs boson self-coupling. The self-coupling, λHHH, is very loosely constrained by electroweak (EW) precision measurements, therefore new physics (NP) effects could induce large deviations from its Standard Model (SM) expectation. Constraints on κλ, defined as the ratio κλ = λHHH/λSM HHH, are set using up to 80 fb−1 of LHC pp collision data at √s = 13 TeV collected with the ATLAS experiment. Single-Higgs results exploit the combination of the analyses targeting the γγ, ZZ∗, WW∗, τ +τ − and b¯b decay channels and use both inclusive and differential information, while double-Higgs results exploit the combination of the analyses targeting the b¯bγγ, b¯bτ +τ − and b¯bb¯b decay channels. From singleHiggs measurements, values outside the interval −3.2 < κλ < 11.9 are excluded at the 95% confidence level (CL) under the assumption that NP affects only the Higgs self-coupling. This interval is comparable to the one obtained from double-Higgs measurements, i.e., −5.0 < κλ < 11.9.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	18 Mar 2021 08:48
Last Modified:	18 Mar 2021 08:48
URI:	http://eprints.bice.rm.cnr.it/id/eprint/20828

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