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Pregled bibliografske jedinice broj: 1060093

Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV


(CMS Collaboration) Sirunyan, Albert M.; ...; Antunović, Željko; Brigljević, Vuko; Ferenček, Dinko; Godinović, Nikola; Kadija, Krešo; Kovač, Marko; Lelas, Damir; Luetić, Jelena et al.
Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV // Physics letters. B, 797 (2019), 134826, 41 doi:10.1016/j.physletb.2019.134826 (međunarodna recenzija, članak, znanstveni)


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Naslov
Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV

Autori
Sirunyan, Albert M. ; ... ; Antunović, Željko ; Brigljević, Vuko ; Ferenček, Dinko ; Godinović, Nikola ; Kadija, Krešo ; Kovač, Marko ; Lelas, Damir ; Luetić, Jelena ; Majumder, Devdatta ; Mesić, Benjamin ; Puljak, Ivica ; Starodumov, Andrey ; Đurić, Senka ; Šuša, Tatjana ; Šćulac, Toni ; ... ; Woods, Nathaniel

Kolaboracija
CMS Collaboration

Izvornik
Physics letters. B (0370-2693) 797 (2019); 134826, 41

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
high energy physics ; experimental particle physics ; LHC ; CMS ; physics ; beyond two generations ; excited top quark ; hadron-hadron scattering (experiments) ; supersymmetry ; beyond standard model ; lepton production ; data acquisition concepts ; detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases) ; modular electronics ; optical detector readout concepts ; particle physics experiments ; data ; Higgs ; muon

Sažetak
Evidence for the light-by-light scattering process, gamma gamma -> gamma gamma, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390 mu b(-1) recorded by the CMS experiment at the LHC. Light-by-light scattering processes are selected in events with two photons exclusively produced, each with transverse energy E-T(gamma) > 2 GeV, pseudorapidity vertical bar eta(gamma)vertical bar < 2.4, diphoton invariant mass m(gamma gamma) > 5 GeV, diphoton transverse momentum p(T)(gamma gamma) < 1 GeV, and diphoton acoplanarity below 0.01. After all selection criteria are applied, 14 events are observed, compared to expectations of 9.0 +/- 0.9 (theo) events for the signal and 4.0 +/- 1.2 (stat) for the background processes. The excess observed in data relative to the background-only expectation corresponds to a significance of 3.7 standard deviations, and has properties consistent with those expected for the light-by-light scattering signal. The measured fiducial light-by-light scattering cross section, sigma(fid)(gamma gamma -> gamma gamma) = 120 +/- 46(stat) +/- 28(syst) +/- 12(theo) nb, is consistent with the standard model prediction. The m(gamma gamma) distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the gamma gamma -> a -> gamma gamma process, in the mass range m(a) = 5-90 GeV.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Ustanove
Fakultet elektrotehnike, strojarstva i brodogradnje, Split,
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Split

Citiraj ovu publikaciju

(CMS Collaboration) Sirunyan, Albert M.; ...; Antunović, Željko; Brigljević, Vuko; Ferenček, Dinko; Godinović, Nikola; Kadija, Krešo; Kovač, Marko; Lelas, Damir; Luetić, Jelena et al.
Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV // Physics letters. B, 797 (2019), 134826, 41 doi:10.1016/j.physletb.2019.134826 (međunarodna recenzija, članak, znanstveni)
(CMS Collaboration) (CMS Collaboration) Sirunyan, A., ..., Antunović, Ž., Brigljević, V., Ferenček, D., Godinović, N., Kadija, K., Kovač, M., Lelas, D. & Luetić, J. (2019) Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV. Physics letters. B, 797, 134826, 41 doi:10.1016/j.physletb.2019.134826.
@article{article, year = {2019}, pages = {41}, DOI = {10.1016/j.physletb.2019.134826}, chapter = {134826}, keywords = {high energy physics, experimental particle physics, LHC, CMS, physics, beyond two generations, excited top quark, hadron-hadron scattering (experiments), supersymmetry, beyond standard model, lepton production, data acquisition concepts, detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases), modular electronics, optical detector readout concepts, particle physics experiments, data, Higgs, muon}, journal = {Physics letters. B}, doi = {10.1016/j.physletb.2019.134826}, volume = {797}, issn = {0370-2693}, title = {Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at root s(NN)=5.02 TeV}, keyword = {high energy physics, experimental particle physics, LHC, CMS, physics, beyond two generations, excited top quark, hadron-hadron scattering (experiments), supersymmetry, beyond standard model, lepton production, data acquisition concepts, detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases), modular electronics, optical detector readout concepts, particle physics experiments, data, Higgs, muon}, chapternumber = {134826} }

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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