descriptionPublicationkeyboard_double_arrow_right Article , Preprint 31 Jul 2019Embargo end date: 01 Jan 2019 English Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 123 (issn: 0031-9007, eissn: 1079-7114,

Authors: Aad, Georges; Abbott, Brad; Abramowicz, Halina; Araujo Pereira, Rodrigo; Haas, Andy; Haber, Carl; Hadavand, Haleh Khani; +193 Authors

Aad, Georges; Abbott, Brad; Abramowicz, Halina; Araujo Pereira, Rodrigo; Haas, Andy; Haber, Carl; Hadavand, Haleh Khani; Haddad, Nacim; Hadef, Asma; Hageboeck, Stephan; Hagihara, Mutsuto; Haleem, Mahsana; Haley, Joseph; Halladjian, Garabed; Arcangeletti, Chiara; Hallewell, Gregory David; Hamacher, Klaus; Hamal, Petr; Hamano, Kenji; Hamdaoui, Hassane; Hamity, Guillermo Nicolas; Han, Kunlin; Han, Liang; Han, Shuo; Hanagaki, Kazunori; Arce, Ayana; Hance, Michael; Handl, David Michael; Haney, Bijan; Hankache, Robert; Hanke, Paul; Hansen, Eva; Hansen, Jorgen Beck; Hansen, Jorn Dines; Hansen, Maike Christina; Hansen, Peter Henrik; Arduh, Francisco Anuar; Hanson, Emily Claire; Hara, Kazuhiko; Hard, Andrew Straiton; Harenberg, Torsten; Harkusha, Siarhei; Harrison, Paul Fraser; Hartmann, Nikolai Marcel; Hasegawa, Yoji; Hasib, Ahmed; Hassani, Samira; Arguin, Jean-Francois; Haug, Sigve; Hauser, Reiner; Havener, Laura Brittany; Havranek, Miroslav; Hawkes, Christopher; Hawkings, Richard; Hayden, Daniel; Hayes, Christopher; Hayes, Robin Leigh; Hays, Chris; Argyropoulos, Spyridon; Hays, Jonathan Michael; Hayward, Helen; Haywood, Stephen; He, Fudong; Heath, Matthew Peter; Hedberg, Vincent; Heelan, Louise; Heer, Sebastian; Heidegger, Kim Katrin; Heidorn, William Dale; Arling, Jan-Hendrik; Heilman, Jesse; Heim, Sarah; Heim, Timon Frank-thomas; Heinemann, Beate; Heinrich, Jochen Jens; Heinrich, Lukas; Heinz, Christian; Hejbal, Jiri; Helary, Louis; Held, Alexander; Armbruster, Aaron James; Hellesund, Simen; Helling, Cole Michael; Hellman, Sten; Helsens, Clement; Henderson, Robert; Heng, Yang; Henkelmann, Steffen; Henriques Correia, Ana Maria; Herbert, Geoffrey Henry; Herde, Hannah; Armitage, Lewis James; Herget, Verena; Hernandez Jimenez, Yesenia; Herr, Holger; Herrmann, Maximilian Georg; Herrmann, Tim; Herten, Gregor; Hertenberger, Ralf; Hervas, Luis; Herwig, Theodor Christian; Hesketh, Gavin Grant; Armstrong, Alexander III; Hessey, Nigel; Higashida, Akihiro; Higashino, Satoshi; Higon-Rodriguez, Emilio; Hildebrand, Kevin; Hill, Ewan; Hill, John; Hill, Kurt Keys; Hiller, Karl Heinz; Hillier, Stephen; Abreu, Henso; Arnaez, Olivier; Hils, Maximilian; Hinchliffe, Ian; Hinterkeuser, Florian; Hirose, Minoru; Hirose, Shigeki; Hirschbuehl, Dominic; Hiti, Bojan; Hladik, Ondrej; Hlaluku, Dingane Reward; Hoad, Xanthe; Arnold, Hannah; Hobbs, John; Hod, Noam; Hodgkinson, Mark; Hoecker, Andreas; Hoenig, Friedrich; Hohn, David; Hohov, Dmytro; Holmes, Tova Ray; Holzbock, Michael; Hommels, Bart; Artamonov, Andrei; Honda, Shunsuke; Honda, Takuya; Hong, Tae Min; Honle, Andreas; Hooberman, Benjamin Henry; Hopkins, Walter Howard; Horii, Yasuyuki; Horn, Philipp; Horyn, Lesya Anna; Hostiuc, Alexandru; Artoni, Giacomo; Hou, Suen; Hoummada, Abdeslam; Howarth, James; Hoya, Joaquin; Hrabovsky, Miroslav; Hrdinka, Julia; Hristova, Ivana; Hrivnac, Julius; Hrynevich, Aliaksei; Hryn'ova, Tetiana; Artz, Sebastian; Hsu, Pai-hsien Jennifer; Hsu, Shih-Chieh; Hu, Qipeng; Hu, Shuyang; Huang, Yanping; Hubacek, Zdenek; Hubaut, Fabrice; Huebner, Michael; Huegging, Fabian; Huffman, Todd Brian; Asai, Shoji; Huhtinen, Mika; Hunter, Robert Francis; Huo, Peng; Hupe, Andre Marc; Huseynov, Nazim; Huston, Joey; Huth, John; Hyneman, Rachel; Hyrych, Sofiia; Iacobucci, Giuseppe; Asbah, Nedaa; Iakovidis, Georgios; Ibragimov, Iskander; Iconomidou-Fayard, Lydia; Idrissi, Zineb; Iengo, Paolo; Ignazzi, Rosanna; Igonkina, Olga; Iguchi, Ryunosuke; Iizawa, Tomoya; Ikegami, Yoichi; Asimakopoulou, Eleni Myrto; Ikeno, Masahiro; Iliadis, Dimitrios; Ilic, Nikolina; Iltzsche Speiser, Franziska; Introzzi, Gianluca; Iodice, Mauro; Iordanidou, Kalliopi; Ippolito, Valerio;

doi: 10.1103/physrevlett.123.052001 , 10.48550/arxiv.1904.03536

pmid: 31491300

arXiv: 1904.03536

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

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Abstract

This letter describes the observation of the light-by-light scattering process, $��\rightarrow��$, in Pb+Pb collisions at $\sqrt{s_\mathrm{NN}}$ = 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 $E_{\textrm{T}}^�� > 3$ GeV and pseudorapidity $|��_��| < 2.37$, 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 $\pm$ 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 $\pm$ 13 (stat.) $\pm$ 7 (syst.) $\pm$ 3 (lumi.) nb.

29 pages in total, author list starting page 13, 2 figures, 0 tables, final version published in PRL. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-19

Related Organizations

The Abdus Salam International Centre for Theoretical Physics (ICTP)
Italy
University of Granada
Spain
Shandong Women’s University
China (People's Republic of)
Kyushu University
Japan
University of Wisconsin–Madison
United States

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Keywords

heavy ion: scattering, mass spectrum: (2photon), 5106 Nuclear and Plasma Physics (for-2020), 51 Physical sciences (for-2020), nucl-ex, Mathematical Sciences, High Energy Physics - Experiment, Scattering process, High Energy Physics - Experiment (hep-ex), Engineering, Pseudorapidities, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), info:eu-repo/classification/ddc/530, Nuclear Experiment, 5107 Particle and High Energy Physics (for-2020), photon: transverse energy, ddc:530, 51 Physical Sciences (for-2020), VDP::Kjerne- og elementærpartikkelfysikk: 431, ULTRARELATIVISTIC HEAVY-ION, Particle and High Energy Physics, ATLAS, Nuclear and Plasma Physics, 49 Mathematical sciences (for-2020), Settore FIS/01 - FISICA SPERIMENTALE, :Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431 [VDP], CERN LHC Coll, Photoproduction, Transverse momenta, Physical Sciences, 09 Engineering (for), DELBRUCK SCATTERING, LHC, channel cross section: measured, General Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Transverse energy, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], VDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431, ATLAS experiment, FOS: Physical sciences, LHC, ATLAS, High Energy Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], transverse momentum, planarity, Relativistic heavy ions, 530, PHYSICS, ultrarelativistic heavy-ion; delbruck scattering; physics, Standard deviation, General Physics (science-metrix), 5020 GeV-cms/nucleon, Selection criteria, particle physics, peripheral, ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика, ATLAS Collaboration, 02 Physical Sciences (for), lead, Integrated luminosity, VDP::Mathematics and natural scienses: 400::Physics: 430::Nuclear and elementary particle physics: 431, hep-ex, background, :Matematikk og naturvitenskap: 400::Fysikk: 430::Kjerne- og elementærpartikkelfysikk: 431 [VDP], 500, Física, 40 Engineering (for-2020), 01 Mathematical Sciences (for), photon: rapidity, Elementary Particles and Fields, photon photon: elastic scattering, hadron, mass spectrum: two-photon, 500.2, experimental results, ddc: ddc:500.2

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