학술논문
Search for exotic decays of the Higgs boson to a pair of pseudoscalars in the μμbb and ττbb final states.
Document Type
article
Author
Hayrapetyan, A; Tumasyan, A; Adam, W; Andrejkovic, J; Bergauer, T; Chatterjee, S; Damanakis, K; Dragicevic, M; Del Valle, A; Hussain, P; Jeitler, M; Krammer, N; Liko, D; Mikulec, I; Schieck, J; Schöfbeck, R; Schwarz, D; Sonawane, M; Templ, S; Waltenberger, W; Wulz, C-E; Darwish, M; Janssen, T; Van Mechelen, P; Bols, E; DHondt, J; Dansana, S; De Moor, A; Delcourt, M; El Faham, H; Lowette, S; Makarenko, I; Müller, D; Sahasransu, A; Tavernier, S; Tytgat, M; Van Putte, S; Vannerom, D; Clerbaux, B; De Lentdecker, G; Favart, L; Hohov, D; Jaramillo, J; Khalilzadeh, A; Lee, K; Mahdavikhorrami, M; Malara, A; Paredes, S; Pétré, L; Postiau, N; Thomas, L; Bemden, M; Velde, C; Vanlaer, P; De Coen, M; Dobur, D; Hong, Y; Knolle, J; Lambrecht, L; Mestdach, G; Rendón, C; Samalan, A; Skovpen, K; Van Den Bossche, N; Wezenbeek, L; Benecke, A; Bruno, G; Caputo, C; Delaere, C; Donertas, I; Giammanco, A; Jaffel, K; Jain, Sa; Lemaitre, V; Lidrych, J; Mastrapasqua, P; Mondal, K; Tran, T; Wertz, S; Alves, G; Coelho, E; Hensel, C; Menezes De Oliveira, T; Moraes, A; Rebello Teles, P; Soeiro, M; Aldá Júnior, W; Alves Gallo Pereira, M; Barroso Ferreira Filho, M; Brandao Malbouisson, H; Carvalho, W; Chinellato, J; Da Costa, E; Da Silveira, G; De Jesus Damiao, D; Fonseca De Souza, S; Martins, J; Mora Herrera, C; Mota Amarilo, K; Mundim, L
Source
European Physical Journal C: Particles and Fields. 84(5)
Subject
Language
Abstract
A search for exotic decays of the Higgs boson (H) with a mass of 125GeV 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=13TeV corresponding to an integrated luminosity of 138fb-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 a1s. The limits depend on the pseudoscalar mass ma1 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 ma1 values between 15 and 60GeV.