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Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at sNN=5.02TeV
dc.contributor | CMS Collaboration | |
dc.creator | Sirunyan, A. M. | |
dc.creator | Tumasyan, A. | |
dc.creator | Adam, W. | |
dc.creator | Ambrogi, F. | |
dc.creator | Adžić, Petar | |
dc.creator | Ćirković, Predrag | |
dc.creator | Devetak, Damir | |
dc.creator | Đorđević, Miloš | |
dc.creator | Milošević, Jovan | |
dc.date.accessioned | 2020-01-30T13:17:08Z | |
dc.date.available | 2020-01-30T13:17:08Z | |
dc.date.issued | 2019 | |
dc.identifier.issn | 0370-2693 | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/8462 | |
dc.description.abstract | Evidence for the light-by-light scattering process, γγ→γγ, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390μb−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 ET γ>2GeV, pseudorapidity |ηγ|<2.4, diphoton invariant mass mγγ>5GeV, diphoton transverse momentum pT γγ<1GeV, 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, σfid(γγ→γγ)=120±46(stat)±28(syst)±12(theo)nb, is consistent with the standard model prediction. The mγγ distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the (Figure presented.) process, in the mass range (Figure presented.). © 2019 The Author(s) | en |
dc.language.iso | en | |
dc.rights | openAccess | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.source | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | |
dc.title | Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at sNN=5.02TeV | en |
dc.type | article | en |
dc.rights.license | BY | |
dcterms.abstract | Тумасyан, A; Сирунyан, A М; Милосевиц, Ј; Дордевиц, М; Деветак, Д; Цирковиц, П; Aдзиц, П; Aмброги, Ф; Aдам, W; | |
dc.rights.holder | © 2019 The Author(s) | |
dc.citation.volume | 797 | |
dc.identifier.wos | 000488071200025 | |
dc.identifier.doi | 10.1016/j.physletb.2019.134826 | |
dc.citation.rank | M21 | |
dc.contributor.count | CMS Collaboration (Ukupan broj autora: 2308) | |
dc.type.version | publishedVersion | |
dc.identifier.scopus | 2-s2.0-85070721104 | |
dc.identifier.fulltext | https://vinar.vin.bg.ac.rs/bitstream/id/21026/10.1016j.physletb.2019.134826.pdf |
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