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.
2025
134
041801
1
20
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.134.041801
LHC, CMS, New resonance
Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; Jeitler, M.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2123279
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