Электронный каталог

Статья

Hayrapetyan, A.
Search for Exotic Decays of the Higgs Boson to a Pair of Pseudoscalars in the *m*mbb and *t*tbb Final States / A.Hayrapetyan, S.Afanasiev, D.Budkouski, I.Golutvin, I.Gorbunov, V.Karjavine, V.Korenkov, A.Lanev, A.Malakhov, V.Matveev, V.Palichik, V.Perelygin, M.Savina, V.Shalaev, S.Shmatov, S.Shulha, V.Smirnov, O.Teryaev, N.Voytishin, B.S.Yuldashev, A.Zarubin, I.Zhizhin, A.Khvedelidze, Z.Tsamalaidze, N.Krasnikov, [CMS Collab.] // The European Physical Journal C [Electronic resource]. – 2024. – Vol. 84, No. 5. – P. 493. – URL: https://doi.org/10.1140/epjc/s10052-024-12727-4. – Bibliogr.: 97.

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 cor- responding to an integrated luminosity of 138 fb&sup(−1) recorded with the CMS detector is analyzed. No statistically signifi- cant 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 a&sub(1)s. The limits depend on the pseudoscalar mass ma1 and are observed to be in the range (0.17–3.3) ×10&sup(−4) and (1.7–7.7) ×10&sup(−2) in the μμbb and ττbb final states, respec- tively. 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 → a&sub(1)a&sub()1 →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 → a&sub(1)a&sub(1) are extracted from the combination of the two channels. In most of the Type II 2HDM+S parameter space, B(H → a&sub(1)a&sub(1) values above 0.23 are excluded at 95% CL for ma1 values between 15 and 60 GeV.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 346.2в - Взаимодействие протонов с протонами
Спец.(статьи,препринты) = С 346.6е2 - Промежуточные бозоны