Evidence for nuclear gluon shadowing from the ALICE measurements of PbPb ultraperipheral exclusive J/ψ production

V. Guzey, E. Kryshen, M. Strikman, M. Zhalov

Research output: Contribution to journalArticlepeer-review

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Abstract

We show that the recent ALICE measurements of exclusive J/ψ production in ultraperipheral PbPb collisions at 2.76 TeV provide the first direct experimental evidence for the strong nuclear gluon shadowing in lead at x~10-3. The evidence is based on the comparison of the nuclear suppression factor S(x≈0.001)=0.61-0.04+0.05 found in the analysis of the coherent J/ψ photoproduction cross sections measured by ALICE with the nuclear gluon shadowing predicted by the global fits of nuclear parton distributions and by the leading twist theory of nuclear shadowing.

Original languageEnglish (US)
Pages (from-to)290-295
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume726
Issue number1-3
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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