Coherent $ρ^0$ photoproduction in ultra-peripheral Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\rm NN}}} = 2.76$ TeV

ALICE Collaboration

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We report the first measurement at the LHC of coherent photoproduction of $\rho^0$ mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum distributions for $\rho^0$ production are studied in the $\pi^+ \pi^-$ decay channel at mid-rapidity. The production cross section in the rapidity range $|y| < 0.5 is found to be dσ/dy = 425 ± 10(stat.) − 50 + 42  (sys.) mb. Coherent ρ 0 production is studied with and without requirement of nuclear breakup, and the fractional yields for various breakup scenarios are presented. The results are compared with those from lower energies and with model predictions.
Original languageEnglish
Article number95
Number of pages26
Issue number9
Publication statusPublished - 15 Sept 2015

Bibliographical note

23 pages, 6 captioned figures, 2 tables, authors from page 18, published version, figures at


  • nucl-ex
  • hep-ex
  • Hadron-Hadron scattering


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