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DC Field | Value | Language |
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dc.contributor.author | Sirunyan, AM | - |
dc.contributor.author | Tumasyan, A | - |
dc.contributor.author | Adam, W | - |
dc.contributor.author | Ambrogi, F | - |
dc.contributor.author | Asilar, E | - |
dc.contributor.author | Bergauer, T | - |
dc.contributor.author | Brandstetter, J | - |
dc.contributor.author | Dragicevic, M | - |
dc.contributor.author | Erö, J | - |
dc.contributor.author | Escalante Del Valle, A | - |
dc.contributor.author | Flechl, M | - |
dc.contributor.author | Frühwirth, R | - |
dc.contributor.author | Ghete, VM | - |
dc.contributor.author | Hrubec, J | - |
dc.contributor.author | Jeitler, M | - |
dc.contributor.author | Krammer, N | - |
dc.contributor.author | Krätschmer, I | - |
dc.contributor.author | Liko, D | - |
dc.contributor.author | Madlener, T | - |
dc.contributor.author | Mikulec, I | - |
dc.contributor.author | Rad, N | - |
dc.contributor.author | Rohringer, H | - |
dc.contributor.author | Schieck, J | - |
dc.contributor.author | Schöfbeck, R | - |
dc.contributor.author | Spanring, M | - |
dc.contributor.author | Spitzbart, D | - |
dc.contributor.author | Taurok, A | - |
dc.contributor.author | Waltenberger, W | - |
dc.contributor.author | Wittmann, J | - |
dc.contributor.author | Wulz, CE | - |
dc.contributor.author | Zarucki, M | - |
dc.contributor.author | Chekhovsky, V | - |
dc.contributor.author | Mossolov, V | - |
dc.contributor.author | Suarez Gonzalez, J | - |
dc.contributor.author | De Wolf, EA | - |
dc.contributor.author | Di Croce, D | - |
dc.contributor.author | Janssen, X | - |
dc.contributor.author | Lauwers, J | - |
dc.contributor.author | Pieters, M | - |
dc.contributor.author | Van Haevermaet, H | - |
dc.contributor.author | Van Mechelen, P | - |
dc.contributor.author | Van Remortel, N | - |
dc.contributor.author | Abu Zeid, S | - |
dc.contributor.author | Blekman, F | - |
dc.contributor.author | D'Hondt, J | - |
dc.contributor.author | De Bruyn, I | - |
dc.contributor.author | De Clercq, J | - |
dc.contributor.author | Deroover, K | - |
dc.contributor.author | Flouris, G | - |
dc.contributor.author | Lontkovskyi, D | - |
dc.contributor.author | Lowette, S | - |
dc.contributor.author | Marchesini, I | - |
dc.contributor.author | Moortgat, S | - |
dc.contributor.author | Moreels, L | - |
dc.contributor.author | Python, Q | - |
dc.contributor.author | Skovpen, K | - |
dc.contributor.author | Tavernier, S | - |
dc.contributor.author | Van Doninck, W | - |
dc.contributor.author | Van Mulders, P | - |
dc.contributor.author | Van Parijs, I | - |
dc.contributor.author | Beghin, D | - |
dc.contributor.author | Bilin, B | - |
dc.contributor.author | Brun, H | - |
dc.contributor.author | Clerbaux, B | - |
dc.contributor.author | De Lentdecker, G | - |
dc.contributor.author | Delannoy, H | - |
dc.contributor.author | Dorney, B | - |
dc.contributor.author | Fasanella, G | - |
dc.contributor.author | Favart, L | - |
dc.contributor.author | Goldouzian, R | - |
dc.contributor.author | Grebenyuk, A | - |
dc.contributor.author | Kalsi, AK | - |
dc.contributor.author | Lenzi, T | - |
dc.contributor.author | Luetic, J | - |
dc.contributor.author | Postiau, N | - |
dc.contributor.author | Starling, E | - |
dc.contributor.author | Thomas, L | - |
dc.contributor.author | Vander Velde, C | - |
dc.contributor.author | Vanlaer, P | - |
dc.contributor.author | Vannerom, D | - |
dc.contributor.author | Wang, Q | - |
dc.contributor.author | Cornelis, T | - |
dc.contributor.author | Dobur, D | - |
dc.contributor.author | Fagot, A | - |
dc.contributor.author | Gul, M | - |
dc.contributor.author | Khvastunov, I | - |
dc.contributor.author | Poyraz, D | - |
dc.contributor.author | Roskas, C | - |
dc.contributor.author | Trocino, D | - |
dc.contributor.author | Tytgat, M | - |
dc.contributor.author | Verbeke, W | - |
dc.contributor.author | Vermassen, B | - |
dc.contributor.author | Vit, M | - |
dc.contributor.author | Zaganidis, N | - |
dc.contributor.author | Bakhshiansohi, H | - |
dc.contributor.author | Bondu, O | - |
dc.contributor.author | Brochet, S | - |
dc.contributor.author | Bruno, G | - |
dc.contributor.author | Caputo, C | - |
dc.contributor.author | David, P | - |
dc.date.accessioned | 2019-10-01T09:54:11Z | - |
dc.date.available | 2019-10-10 | - |
dc.date.available | 2019-10-01T09:54:11Z | - |
dc.date.issued | 2019-08-01 | - |
dc.identifier.citation | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2019, 797 | en_US |
dc.identifier.issn | 0370-2693 | - |
dc.identifier.issn | http://dx.doi.org/10.1016/j.physletb.2019.134826 | - |
dc.identifier.uri | http://bura.brunel.ac.uk/handle/2438/19200 | - |
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 5.02 TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390 μb−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 Eγ T > 2 GeV, pseudorapidity |ηγ | < 2.4, diphoton invariant mass mγγ > 5 GeV, diphoton transverse momentum pγγ T < 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, 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 γγ → a → γγ process, in the mass range ma = 5–90 GeV. | en_US |
dc.description.sponsorship | STFC (United Kingdom); The Marie-Curie programme; The European Research Council; Horizon 2020 Grant | en_US |
dc.language.iso | en | en_US |
dc.publisher | Elsevier | en_US |
dc.subject | Light-by-light | en_US |
dc.subject | CMS | en_US |
dc.subject | UPC | en_US |
dc.subject | Photoproduction | en_US |
dc.subject | PbPb | en_US |
dc.title | Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at s<inf>NN</inf>=5.02TeV | en_US |
dc.type | Article | en_US |
dc.identifier.doi | http://dx.doi.org/10.1016/j.physletb.2019.134826 | - |
dc.relation.isPartOf | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | - |
pubs.publication-status | Accepted | - |
pubs.volume | 797 | - |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
Files in This Item:
File | Description | Size | Format | |
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FullText.pdf | 1.34 MB | Adobe PDF | View/Open |
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