Journal article

Observation of Light-by-Light Scattering in Ultraperipheral Pb plus Pb Collisions with the ATLAS Detector


Authors listAad, G.; Abbott, B.; Abbott, D. C.; Abdinov, O.; Abud, A. Abed; Abeling, K.; Abhayasinghe, D. K.; Abidi, S. H.; AbouZeid, O. S.; Abraham, N. L.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Achkar, B.; Adachi, S.; Adam, L.; Bourdarios, C. Adam; Adamczyk, L.; Adamek, L.; Adelman, J.; Adersberger, M.; Adiguzel, A.; Adorni, S.; Adye, T.; Affolder, A. A.; Afik, Y.; Agapopoulou, C.; Agaras, M. N.; Aggarwal, A.; Agheorghiesei, C.; Aguilar-Saavedra, J. A.; Ahmadov, F.; Ahmed, W. S.; Ai, X.; Aielli, G.; Akatsuka, S.; Kesson, T. P. A.; Akilli, E.; Akimov, A., V; Al Khoury, K.; Alberghi, G. L.; Albert, J.; Alconada Verzini, M. J.; Alderweireldt, S.; Aleksa, M.; Aleksandrov, I. N.; Alexa, C.; Alexandre, D.; Alexopoulos, T.; Alfonsi, A.; Alhroob, M.; Ali, B.; Alimonti, G.; Alison, J.; Alkire, S. P.; Allaire, C.; Allbrooke, B. M. M.; Allen, B. W.; Allport, P. P.; Aloisio, A.; Alonso, A.; Alonso, F.; Alpigiani, C.; Alshehri, A. A.; Alvarez Estevez, M.; Alvarez Piqueras, D.; Alviggi, M. G.; Amaral Coutinho, Y.; Ambler, A.; Ambroz, L.; Amelung, C.; Amidei, D.; Amor Dos Santos, S. P.; Amoroso, S.; Amrouche, C. S.; An, F.; Anastopoulos, C.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, J. K.; Andreazza, A.; Andrei, V; Anelli, C. R.; Angelidakis, S.; Angerami, A.; Anisenkov, A., V; Annovi, A.; Antel, C.; Anthony, M. T.; Antonelli, M.; Antrim, D. J. A.; Anulli, F.; Aoki, M.; Aparisi Pozo, J. A.; Bella, L. Aperio; Arabidze, G.; Araque, J. P.; Araujo Ferraz, V; Araujo Pereira, R.; Arcangeletti, C.; Arce, A. T. H.; Arduh, F. A.; Arguin, J-F; Argyropoulos, S.; Arling, J-H; Armbruster, A. J.; Armitage, L. J.; Armstrong, A.; Arnaez, O.; Arnold, H.; Artamonov, A.; Artoni, G.; Artz, S.; Asai, S.; Asbah, N.; Asimakopoulou, E. M.; Asquith, L.; Assamagan, K.; Astalos, R.; Atkin, R. J.; Atkinson, M.; Atlay, N. B.; Atmani, H.; Augsten, K.; Avolio, G.; Avramidou, R.; Ayoub, M. K.; Azoulay, A. M.; Azuelos, G.; Baca, M. J.; Bachacou, H.; Bachas, K.; Backes, M.; Backman, F.; Bagnaia, P.; Bahmani, M.; Bahrasemani, H.; Bailey, A. J.; Bailey, V. R.; Baines, J. T.; Bajic, M.; Bakalis, C.; Baker, O. K.; Bakker, P. J.; Gupta, D. Bakshi; Balaji, S.; Baldin, E. M.; Balek, P.; Balli, F.; Balunas, W. K.; Balz, J.; Banas, E.; Bandyopadhyay, A.; Banerjee, Sw; Bannoura, A. A. E.; Barak, L.; Barbe, W. M.; Barberio, E. L.; Barberis, D.; Barbero, M.; Barillari, T.; Barisits, M-S; Barkeloo, J.; Barklow, T.; Barnea, R.; Barnes, S. L.; Barnett, B. M.; Barnett, R. M.; Barnovska-Blenessy, Z.; Baroncelli, A.; Barone, G.; Barr, A. J.; Navarro, L. Barranco; Barreiro, F.; da Costa, J. Barreiro Guimares; Barsov, S.; Bartoldus, R.; Bartolini, G.; Barton, A. E.; Bartos, P.; Basalaev, A.; Bassalat, A.; Bates, R. L.; Batista, S. J.; Batlamous, S.; Batley, J. R.; Batool, B.; Battaglia, M.; Bauce, M.; Bauer, F.; Bauer, K. T.; Bawa, H. S.; Beacham, J. B.; Beau, T.; Beauchemin, P. H.; Becherer, F.; Bechtle, P.; Beck, H. C.; Beck, H. P.; Becker, K.; Becker, M.; Becot, C.; Beddall, A.; Beddall, A. J.; Bednyakov, V. A.; Bedognetti, M.; Bee, C. P.; Beermann, T. A.; Begalli, M.; Begel, M.; Behera, A.; Behr, J. K.; Beisiegel, F.; Bell, A. S.; Bella, G.; Bellagamba, L.; Bellerive, A.; Bellos, P.; Beloborodov, K.; Belotskiy, K.; Belyaev, N. L.; Benchekroun, D.; Benekos, N.; Benhammou, Y.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Bentvelsen, S.; Beresford, L.; Beretta, M.; Berge, D.; Kuutmann, E. Bergeaas; Berger, N.; Bergmann, B.; Bergsten, L. J.; Beringer, J.; Berlendis, S.; Bernard, N. R.; Bernardi, G.; Bernius, C.; Berry, T.; Berta, P.; Bertella, C.; Bertram, I. A.; Besjes, G. J.; Bylund, O. Bessidskaia; Besson, N.; Bethani, A.; Bethke, S.; Betti, A.; Bevan, A. J.; Beyer, J.; Bi, R.; Bianchi, R. M.; Biebel, O.; Biedermann, D.; Bielski, R.; Bierwagen, K.; Biesuz, N., V; Biglietti, M.; Billoud, T. R., V; Bindi, M.; Bingul, A.; Bini, C.; Biondi, S.; Birman, M.; Bisanz, T.; Biswal, J. P.; Bitadze, A.; Bittrich, C.; Bjorke, K.; Black, K.

Publication year2019

JournalPhysical Review Letters

Volume number123

Issue number5

ISSN0031-9007

eISSN1079-7114

DOI Linkhttps://doi.org/10.1103/PhysRevLett.123.052001

PublisherAmerican Physical Society


Abstract
This Letter describes the observation of the light-by-light scattering process, gamma gamma -> gamma gamma, in Pb + Pb collisions at root S-NN = 5.02 TeV. The analysis is conducted using a data sample corresponding to an integrated luminosity of 1.73 nb(-1), collected in November 2018 by the ATLAS experiment at the LHC. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy E-T(gamma) > 3 GeV and pseudorapidity vertical bar eta(gamma)vertical bar < 2.4, diphoton invariant mass above 6 GeV, and small diphoton transverse momentum and acoplanarity. After applying all selection criteria, 59 candidate events are observed for a background expectation of 12 +/- 3 events. The observed excess of events over the expected background has a significance of 8.2 standard deviations. The measured fiducial cross section is 78 +/- 13(stat) +/- 7(syst) +/- 3(lumi) nb.



Citation Styles

Harvard Citation styleAad, G., Abbott, B., Abbott, D., Abdinov, O., Abud, A., Abeling, K., et al. (2019) Observation of Light-by-Light Scattering in Ultraperipheral Pb plus Pb Collisions with the ATLAS Detector, Physical Review Letters, 123(5), Article 052001. https://doi.org/10.1103/PhysRevLett.123.052001

APA Citation styleAad, G., Abbott, B., Abbott, D., Abdinov, O., Abud, A., Abeling, K., Abhayasinghe, D., Abidi, S., AbouZeid, O., Abraham, N., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B., Achkar, B., Adachi, S., Adam, L., Bourdarios, C., Adamczyk, L., ...Black, K. (2019). Observation of Light-by-Light Scattering in Ultraperipheral Pb plus Pb Collisions with the ATLAS Detector. Physical Review Letters. 123(5), Article 052001. https://doi.org/10.1103/PhysRevLett.123.052001



Keywords


DELBRUCK SCATTERINGPHYSICSULTRARELATIVISTIC HEAVY-ION

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