A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at (Formula presented) in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of (Formula presented) collected in 2016-2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta ((Formula presented)), back-to-back in azimuth, and with a large diphoton invariant mass ((Formula presented)) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95% confidence level are derived for the four-photon anomalous coupling parameters (Formula presented) and (Formula presented), using an effective field theory. Additionally, upper limits are placed on the production of axionlike particles with coupling strength to photons (Formula presented) that varies from (Formula presented) to (Formula presented) over the mass range from 500 to 2000 GeV.

Search for high-mass exclusive diphoton production with tagged protons in proton-proton collisions at √s=13  TeV

Bruschini, D.;
2024

Abstract

A search is presented for high-mass exclusive diphoton production via photon-photon fusion in proton-proton collisions at (Formula presented) in events where both protons survive the interaction. The analysis utilizes data corresponding to an integrated luminosity of (Formula presented) collected in 2016-2018 with the central CMS detector and the CMS and TOTEM precision proton spectrometer (PPS). Events that have two photons with high transverse momenta ((Formula presented)), back-to-back in azimuth, and with a large diphoton invariant mass ((Formula presented)) are selected. To remove the dominant inclusive diphoton backgrounds, the kinematic properties of the protons detected in PPS are required to match those of the central diphoton system. Only events having opposite-side forward protons detected with a fractional momentum loss between 0.035 and 0.15 (0.18) for the detectors on the negative (positive) side of CMS are considered. One exclusive diphoton candidate is observed for an expected background of 1.1 events. Limits at 95% confidence level are derived for the four-photon anomalous coupling parameters (Formula presented) and (Formula presented), using an effective field theory. Additionally, upper limits are placed on the production of axionlike particles with coupling strength to photons (Formula presented) that varies from (Formula presented) to (Formula presented) over the mass range from 500 to 2000 GeV.
2024
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Axion-like particles; Photons; Hadron colliders
   Advanced Multi-Variate Analysis for New Physics Searches at the LHC
   AMVA4NewPhysics
   European Commission
   Horizon 2020 Framework Programme
   675440

   Search for Higgs bosons decaying to charm quarks
   HIGCC
   European Commission
   Horizon 2020 Framework Programme
   724704

   Direct and indirect searches for new physics in events with top quarks using LHC proton-proton collisions at the CMS detector
   LHCTOPVLQ
   European Commission
   Horizon 2020 Framework Programme
   752730

   Majorana neutrino discovery strategy with CMS
   MajorNet
   European Commission
   Horizon 2020 Framework Programme
   758316

   International Training Network for Statistics in High Energy Physics and Society
   INSIGHTS
   European Commission
   Horizon 2020 Framework Programme
   765710

   The strong interaction at the frontier of knowledge: fundamental research and applications
   STRONG-2020
   European Commission
   Horizon 2020 Framework Programme
   824093
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154807
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