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

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

doi:10.1016/j.physletb.2013.08.043

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

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

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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 language	English (US)
Pages (from-to)	290-295
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	726
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physletb.2013.08.043
State	Published - 2013

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2013.08.043

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

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.",

author = "V. Guzey and E. Kryshen and M. Strikman and M. Zhalov",

note = "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 .",

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doi = "10.1016/j.physletb.2013.08.043",

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

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