Observation of Light-by-Light Scattering in Ultraperipheral Pb + Pb Collisions with the ATLAS Detector
Please always quote using this URN: urn:nbn:de:bvb:20-opus-226892
- 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 invariantThis 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.…
| URN: | urn:nbn:de:bvb:20-opus-226892 |
|---|---|
| Document Type: | Journal article |
| Faculties: | Fakultät für Physik und Astronomie / Physikalisches Institut |
| Language: | English |
| Parent Title (English): | Physical Review Letters |
| Year of Completion: | 2019 |
| Volume: | 123 |
| Article Number: | 052001 |
| Pagenumber: | 1-21 |
| Source: | Phys. Rev. Lett. 123, 052001, 2019. doi:10.1103/PhysRevLett.123.052001 |
| DOI: | https://doi.org/10.1103/PhysRevLett.123.052001 |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Tag: | Delbruck Scattering; Physics; Relativistic heavy-ion collisions; Ultrarelativistic Heavy-Ion |
| Release Date: | 2024/01/23 |
| Creating Corporation: | The ATLAS Collaboration |
| Licence (German): |  CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |