A search is presented for an extended Higgs sector with two new particles, X and phi, in the process X to phi phi to (gamma gamma) (gamma ganna ). Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data at √s=13 TeV collected with the CMS detector, corresponding to an integrated luminosity of 138 fb−1. No evidence of such resonances is seen. Upper limits are set on the production cross section for m_X between 300 and 3000 GeV and m_phi/m_X between 0.5% and 2.5%, representing the most sensitive search in this channel.
Search for New Resonances Decaying to Pairs of Merged Diphotons in Proton-Proton Collisions at √s=13 TeV
Tornago, M.;Cappati, A.;Meridiani, P.;Amapane, N.;Argiro, S.;Bellan, R.;Bellora, A.;Borca, C.;Costa, M.;Covarelli, R.;Grippo, M.;Kiani, B.;Luongo, F.;Markovic, L.;Mecca, A.;Migliore, E.;Mulargia, R.;Obertino, M. M.;Pacher, L.;Siviero, F.;Sola, V.;Solano, A.;Tarricone, C.;Umoret, G.;Shchelina, K.;Rumerio, P.;Ravera, F.;Salvatico, R.;Vagnerini, A.;
2025-01-01
Abstract
A search is presented for an extended Higgs sector with two new particles, X and phi, in the process X to phi phi to (gamma gamma) (gamma ganna ). Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data at √s=13 TeV collected with the CMS detector, corresponding to an integrated luminosity of 138 fb−1. No evidence of such resonances is seen. Upper limits are set on the production cross section for m_X between 300 and 3000 GeV and m_phi/m_X between 0.5% and 2.5%, representing the most sensitive search in this channel.File in questo prodotto:
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PhysRevLett.134.041801.pdf
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