Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ<SUP>0</SUP> photoproduction in Pb-Pb collisions at √sNN=5.02 TeV

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초록

This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced rho(0) mesons. The rho(0) mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the cos(2 phi) modulation, where phi is 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 root s(NN) = 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(2 phi) modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured cos(2 phi) 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.

키워드

PERIPHERAL COLLISIONSGAMMA-GAMMADISSOCIATIONINTERFERENCENUCLEUSMODEL
제목
Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ<SUP>0</SUP> photoproduction in Pb-Pb collisions at √sNN=5.02 TeV
저자
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DOI
10.1016/j.physletb.2024.139017
발행일
2024-11
유형
Article
저널명
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
858