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

ATLAS Collaboration

doi:10.1103/PhysRevLett.123.052001

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

ATLAS Collaboration

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Abstract

This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=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 ETγ>3 GeV and pseudorapidity |ηγ|<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.

Originalsprog	Engelsk
Artikelnummer	052001
Tidsskrift	Physical Review Letters
Vol/bind	123
Udgave nummer	5
Antal sider	21
ISSN	0031-9007
DOI	https://doi.org/10.1103/PhysRevLett.123.052001
Status	Udgivet - 31 jul. 2019

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10.1103/PhysRevLett.123.052001Licens: CC BY

PhysRevLett.123.052001Forlagets udgivne version, 348 KB

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title = "Observation of Light-by-Light Scattering in Ultraperipheral Pb plus Pb Collisions with the ATLAS Detector",

abstract = "This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=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 ETγ>3 GeV and pseudorapidity |ηγ|<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.",

author = "G. Aad and B. Abbott and DC Abbott and O. Abdinov and AA Abud and K. Abeling and DK Abhayasinghe and S.H. Abidi and AbouZeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and Y. Abulaiti and B.S. Acharya and B. Achkar and Sosuke Adachi and Luise Adam and CA Bourdarios and Geert-Jan Besjes and {Alonso Diaz}, Alejandro and Alessandra Camplani and Mogens Dam and {de Almeida Dias}, Flavia and Galster, {Gorm Aske Gram Krohn} and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Monk, {James William} and hqz214 hqz214 and Milena Bajic and Rosanna Ignazzi and Graig Wiglesworth and Petersen, {Troels Christian} and Stark, {Simon Holm} and Stefania Xella and {ATLAS Collaboration}",

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doi = "10.1103/PhysRevLett.123.052001",

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AU - Aad, G.

AU - Abbott, B.

AU - Abbott, DC

AU - Abdinov, O.

AU - Abud, AA

AU - Abeling, K.

AU - Abhayasinghe, DK

AU - Abidi, S.H.

AU - AbouZeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Achkar, B.

AU - Adachi, Sosuke

AU - Adam, Luise

AU - Bourdarios, CA

AU - Besjes, Geert-Jan

AU - Alonso Diaz, Alejandro

AU - Camplani, Alessandra

AU - Dam, Mogens

AU - de Almeida Dias, Flavia

AU - Galster, Gorm Aske Gram Krohn

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Monk, James William

AU - hqz214, hqz214

AU - Bajic, Milena

AU - Ignazzi, Rosanna

AU - Wiglesworth, Graig

AU - Petersen, Troels Christian

AU - Stark, Simon Holm

AU - Xella, Stefania

AU - ATLAS Collaboration

PY - 2019/7/31

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N2 - This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=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 ETγ>3 GeV and pseudorapidity |ηγ|<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.

AB - This Letter describes the observation of the light-by-light scattering process, γγ→γγ, in Pb+Pb collisions at sNN=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 ETγ>3 GeV and pseudorapidity |ηγ|<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.

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DO - 10.1103/PhysRevLett.123.052001

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SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

M1 - 052001

ER -

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

Abstract

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