TY - JOUR
T1 - Evidence for nuclear gluon shadowing from the ALICE measurements of PbPb ultraperipheral exclusive J/ψ production
AU - Guzey, V.
AU - Kryshen, E.
AU - Strikman, M.
AU - Zhalov, M.
N1 - Funding Information:
We would like to thank L. Frankfurt and H. Honkanen for useful discussions and H. Honkanen for providing the EPS09 predictions used in the middle panel of Fig. 3 . This work was supported in part by US DOE Contract Number DE-FG02-93ER40771 .
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2013.08.043
DO - 10.1016/j.physletb.2013.08.043
M3 - Article
AN - SCOPUS:84884699961
VL - 726
SP - 290
EP - 295
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-3
ER -