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Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb$^{-1}$ of Pb+Pb data with the ATLAS detector

ATLAS Collaboration (2021). Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb$^{-1}$ of Pb+Pb data with the ATLAS detector. Journal of High Energy Physics, 03, 243. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2020-150.

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ATLAS Collaboration1, Author
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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650

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Free keywords: ATLAS
Abstract: This paper describes a measurement of light-by-light scattering based on Pb+Pb collision data recorded by the ATLAS experiment during Run 2 of the LHC. The study uses $2.2$ nb$^{-1}$ of integrated luminosity collected in 2015 and 2018 at $\sqrt{s_\mathrm{NN}}=5.02$ TeV. Light-by-light scattering candidates are selected in events with two photons produced exclusively, each with transverse energy $E_{\mathrm{T}}^{\gamma} > 2.5$ GeV, pseudorapidity $|\eta_{\gamma}| < 2.37$, diphoton invariant mass $m_{\gamma\gamma} > 5$ GeV, and with small diphoton transverse momentum and diphoton acoplanarity. The integrated and differential fiducial cross sections are measured and compared with theoretical predictions. The diphoton invariant mass distribution is used to set limits on the production of axion-like particles. This result provides the most stringent limits to date on axion-like particle production for masses in the range 6-100 GeV. Cross sections above 2 to 70 nb are excluded at the 95% CL in that mass interval.

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Dates: 2021
Publication Status: Published in print
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Title: Journal of High Energy Physics
Abbreviation : JHEP
Source Genre: Journal
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Pages: - Volume / Issue: 03 Sequence Number: - Start / End Page: 243 Identifier: -