A search for exotic decays of the Higgs boson (H) with a mass of 125 GeV to a pair of light pseudoscalars a1 is performed in final states where one pseudoscalar decays to two b quarks and the other to a pair of muons or τ leptons. A data sample of proton–proton collisions at √s = 13 TeV corresponding to an integrated luminosity of 138 fb−1 recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level (CL) on the Higgs boson branching fraction to μμbb and to ττbb, via a pair of a1 s. The limits depend on the pseudoscalar mass m_a1 and are observed to be in the range (0.17–3.3) ×10−4 and (1.7–7.7) ×10−2 in the μμbb and ττbb final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction B(H → a1a1 → llbb) at 95% CL, with l being a muon or a τ lepton. For different types of 2HDM+S, upper bounds on the branching fraction B(H → a1a1) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, B(H → a1a1) values above 0.23 are excluded at 95% CL for m_a1 values between 15 and 60 GeV.

Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the $$\upmu \upmu \text{ b } \text{ b } $$ and $$\uptau \uptau \text{ b } \text{ b } $$ final states / null, n., Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., Damanakis, K., Dragicevic, M., Del Valle, A.E., Hussain, P.S., Jeitler, M., Krammer, N., Liko, D., Mikulec, I., Schieck, J., Schöfbeck, R., Schwarz, D., Sonawane, M., Templ, S., et al.. - In: EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6052. - ELETTRONICO. - 84:(2024), pp. 493.0-493.0. [10.1140/epjc/s10052-024-12727-4]

Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the $$\upmu \upmu \text{ b } \text{ b } $$ and $$\uptau \uptau \text{ b } \text{ b } $$ final states

Bardelli, G.;Camaiani, B.;Ceccarelli, R.;Ciulli, V.;D'Alessandro, R.;Focardi, E.;Latino, G.;Lenzi, P.;Lizzo, M.;Papanastassiou, A.;
2024

Abstract

A search for exotic decays of the Higgs boson (H) with a mass of 125 GeV to a pair of light pseudoscalars a1 is performed in final states where one pseudoscalar decays to two b quarks and the other to a pair of muons or τ leptons. A data sample of proton–proton collisions at √s = 13 TeV corresponding to an integrated luminosity of 138 fb−1 recorded with the CMS detector is analyzed. No statistically significant excess is observed over the standard model backgrounds. Upper limits are set at 95% confidence level (CL) on the Higgs boson branching fraction to μμbb and to ττbb, via a pair of a1 s. The limits depend on the pseudoscalar mass m_a1 and are observed to be in the range (0.17–3.3) ×10−4 and (1.7–7.7) ×10−2 in the μμbb and ττbb final states, respectively. In the framework of models with two Higgs doublets and a complex scalar singlet (2HDM+S), the results of the two final states are combined to determine upper limits on the branching fraction B(H → a1a1 → llbb) at 95% CL, with l being a muon or a τ lepton. For different types of 2HDM+S, upper bounds on the branching fraction B(H → a1a1) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, B(H → a1a1) values above 0.23 are excluded at 95% CL for m_a1 values between 15 and 60 GeV.
2024
84
0
0
null, null; Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Del Valle, A. Es...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1401243
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