Search for Higgs boson decays into a pair of light bosons in the bbμμ final state in pp collision at √s=13TeV with the ATLAS detector

A search for decays of the Higgs boson into a pair of new spin-zero particles, H→aa, where the a-bosons decay into a b-quark pair and a muon pair, is presented. The search uses 36.1 fb of proton-proton collision data at s=13 TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. No signif...

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Hauptverfasser:	Alkire, S.P, Allport, P.P, Alpigiani, C, Arguin, J.F, Avolio, G, Banas, E, Barkeloo, J, Barlow, N, Beacham, J.B, Bessner, M, Bini, C, Black, K.M, Bortfeldt, J, Buat, Q, Cakir, O, Carrillo-Montoya, G.D, Casadei, D, Cerri, A, Chen, X, Cheung, K, Dado, T, Dann, N.D, De la Torre, H, Dickinson, J, Dobre, M, Dova, M.T, Dudder, A.C, Elmsheuser, J, Escalier, M, Estrada Pastor, O, Faucci Giannelli, M, Flaschel, N, Förster, F.A, Fusayasu, T, García, C, Gottardo, C.A, Gradin, P.O.J, Gul, U, Hadef, A, Haywood, S.J, Heath, M.P, Hernández Jiménez, Y, Hill, K.K, Hirose, M, Hoecker, A, Istin, S, Jézéquel, S, Jinnouchi, O, Kepka, O, Khalil-Zada, F, Klein, M, Kuleshov, S, Lack, D.P.J, Leggett, C, Levêque, J, Little, J.D, Love, P.A, Majewski, S, Mallik, U, Mancini, G, Marchiori, G, McDonald, E.F, Mdhluli, J.E, Mehta, A, Meng, L, Moschovakos, P, Mosidze, M, Naumann, T, Orgill, E.C, Pallin, D, Pedersen, M, Peleganchuk, S.V, Perrella, S, Proklova, N, Resconi, S, Rizvi, E, Santra, A, Sapronov, A, Saraiva, J.G, Seixas, J.M, Søgaard, A, Stenzel, H, Stockton, M.C, Sumida, T, Taffard, A, Tapprogge, S, Tsiskaridze, V, Tuts, P.M, Wagner, W, Wang, A.M, Webb, A.F, Webb, S, Winkels, E, Winklmeier, F, Worm, S.D, Wraight, K, Xella, S, Xu, H, Zhemchugov, A, Ziolkowski, M
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Zusammenfassung:	A search for decays of the Higgs boson into a pair of new spin-zero particles, H→aa, where the a-bosons decay into a b-quark pair and a muon pair, is presented. The search uses 36.1 fb of proton-proton collision data at s=13 TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the Standard Model prediction is observed. Upper limits at 95% confidence level are placed on the branching ratio (σ/σ)×B(H→aa→bbμμ), ranging from 1.2×10 to 8.4×10 in the a-boson mass range of 20-60 GeV. Model-independent limits are set on the visible production cross-section times the branching ratio to the bbμμ final state for new physics, σ(X)×B(X→bbμμ), ranging from 0.1 fb to 0.73 fb for m between 18 and 62 GeV.