Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV

Y. Bai; F. Benedosso; M.A.J. Botje; J. Castillo; O. Grebenyuk; A. Mischke; T. Peitzmann; M.J. Russcher; R.J.M. Snellings; N. van der Kolk

Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV

Y. Bai, F. Benedosso, M.A.J. Botje, J. Castillo, O. Grebenyuk, A. Mischke, T. Peitzmann, M.J. Russcher, R.J.M. Snellings, N. van der Kolk

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Abstract

Measurements of the production of forward π0 mesons from p+p and d+Au collisions at VsNN=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

Original language	Undefined/Unknown
Pages (from-to)	152302/1-152302/6
Number of pages	6
Journal	Physical Review Letters
Volume	97
Issue number	15
Publication status	Published - 2006

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title = "Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV",

abstract = "Measurements of the production of forward π0 mesons from p+p and d+Au collisions at VsNN=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.",

author = "Y. Bai and F. Benedosso and M.A.J. Botje and J. Castillo and O. Grebenyuk and A. Mischke and T. Peitzmann and M.J. Russcher and R.J.M. Snellings and {van der Kolk}, N.",

note = "STAR Collaboration",

year = "2006",

language = "Undefined/Unknown",

volume = "97",

pages = "152302/1--152302/6",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "15",

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TY - JOUR

T1 - Forward neutral pion production in p+p and d+Au collisions at VsNN=200 GeV

AU - Bai, Y.

AU - Benedosso, F.

AU - Botje, M.A.J.

AU - Castillo, J.

AU - Grebenyuk, O.

AU - Mischke, A.

AU - Peitzmann, T.

AU - Russcher, M.J.

AU - Snellings, R.J.M.

AU - van der Kolk, N.

N1 - STAR Collaboration

PY - 2006

Y1 - 2006

N2 - Measurements of the production of forward π0 mesons from p+p and d+Au collisions at VsNN=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

AB - Measurements of the production of forward π0 mesons from p+p and d+Au collisions at VsNN=200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as η increases, decreasing to ∼30% of the p+p yield at ⟨η⟩=4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward π0 with charged hadrons at η≈0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

M3 - Article

SN - 0031-9007

VL - 97

SP - 152302/1-152302/6

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

ER -