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Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb–Pb collisions at √sNN = 5.02 TeV

Acharya, S.
•
Adamová, D.
•
Agarwal, A.
altro
Zurlo, N.
2024
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
Abstract
This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced ρ0 mesons. The ρ0 mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos(2φ) modulation, where φis the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb–Pb collisions at a center-of-mass energy of √sNN = 5.02 TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the cos(2φ)modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos(2φ) anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.
DOI
10.1016/j.physletb.2024.139017
WOS
WOS:001373599700001
Archivio
https://hdl.handle.net/11368/3096019
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85204389624
https://www.sciencedirect.com/science/article/pii/S0370269324005756
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/3096019/1/PLB_858(2024)139017_1-14.pdf
Soggetti
  • Experiments with heav...

  • photoproduction

  • LHC

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