We present the first direct search for exotic Higgs boson decays H -> AA, A -> gamma gamma in events with two photonlike objects. The hypothetical particle A is a low-mass spin-0 particle decaying promptly to a merged diphoton reconstructed as a single photonlike object. We analyze the data collected by the CMS ffiffi experiment at V s = 13 TeV corresponding to an integrated luminosity of 136 fb-1. No excess above the estimated background is found. We set upper limits on the branching fraction B(H -> AA -> 4 gamma) of (0.9-3.3) x 10-3 at 95% confidence level for masses of A in the range 0.1-1.2 GeV.

Search for Exotic Higgs Boson Decays H→AA→4γ with Events Containing Two Merged Diphotons in Proton-Proton Collisions at Vs=13 TeV / Tumasyan, A; Adam, W; Andrejkovic, J W; Bergauer, T; Chatterjee, S; Damanakis, K; Dragicevic, M; Escalante Del Valle, A; Hussain, P S; Jeitler, M; Krammer, N; Lechner, L; Liko, D; Mikulec, I; Paulitsch, P; Pitters, F M; Schieck, J; Schöfbeck, R; Schwarz, D; Templ, S; Waltenberger, W; Wulz, C-E; Darwish, M R; Janssen, T; Kello, T; Rejeb Sfar, H; Van Mechelen, P; Bols, E S; D'Hondt, J; De Moor, A; Delcourt, M; El Faham, H; Lowette, S; Moortgat, S; Morton, A; Müller, D; Sahasransu, A R; Tavernier, S; Van Doninck, W; Vannerom, D; Clerbaux, B; De Lentdecker, G; Favart, L; Hohov, D; Jaramillo, J; Lee, K; Mahdavikhorrami, M; Makarenko, I; Malara, A; Paredes, S; Pétré, L; Postiau, N; Starling, E; Thomas, L; Vanden Bemden, M; Vander Velde, C; Vanlaer, P; Dobur, D; Knolle, J; Lambrecht, L; Mestdach, G; Niedziela, M; Rendón, C; Roskas, C; Samalan, A; Skovpen, K; Tytgat, M; 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[10.1103/PhysRevLett.131.101801]

Search for Exotic Higgs Boson Decays H→AA→4γ with Events Containing Two Merged Diphotons in Proton-Proton Collisions at Vs=13 TeV

Battilana, C;Bonacorsi, D;Borgonovi, L;Castro, A;Cuffiani, M;Diotalevi, T;Fanfani, A;Giommi, L;Guiducci, L;Lunerti, L;Rovelli, T;Siroli, G P;