Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV

STAR Collaboration

doi:10.1103/PhysRevLett.92.171801

Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV

STAR Collaboration

Research output: Contribution to journal › Article › peer-review

203 Scopus citations

Abstract

Measurements of the production of forward high-energy π⁰ mesons from transversely polarized proton collisions at √s = 200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x_F below about 0.3, and becomes positive and large at higher x_F, similar to the trend in data at √s ≤ 20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p_T > 1 GeV=c at a polarized proton collider.

Original language	English
Article number	171801
Pages (from-to)	171801-1-171801-6
Journal	Physical Review Letters
Volume	92
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevLett.92.171801
State	Published - Apr 30 2004

Funding

We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their sup?>port. This work was supported in part by the HENP Divisions of the Office of Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; Grant Agency of the Czech Republic, DAE, DST, and CSIR of the Government of India; the Swiss NSF.

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10.1103/PhysRevLett.92.171801

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@article{2143453f51f549e790b8a3930c78e0a6,

title = "Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV",

abstract = "Measurements of the production of forward high-energy π0 mesons from transversely polarized proton collisions at √s = 200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at xF below about 0.3, and becomes positive and large at higher xF, similar to the trend in data at √s ≤ 20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with pT > 1 GeV=c at a polarized proton collider.",

author = "\{STAR Collaboration\} and J. Adams and C. Adler and Aggarwal, \{M. M.\} and Z. Ahammed and J. Amonett and Anderson, \{B. D.\} and M. Anderson and D. Arkhipkin and Averichev, \{G. S.\} and Badyal, \{S. K.\} and J. Balewski and O. Barannikova and Barnby, \{L. S.\} and J. Baudot and S. Bekele and Belaga, \{V. V.\} and R. Bellwied and J. Berger and Bezverkhny, \{B. I.\} and S. Bhardwaj and P. Bhaskar and Bhati, \{A. K.\} and H. Bichsel and A. Billmeier and Bland, \{L. C.\} and Blyth, \{C. O.\} and Bonner, \{B. E.\} and M. Botje and A. Boucham and A. Brandin and A. Bravar and Cadman, \{R. V.\} and Cai, \{X. Z.\} and H. Caines and \{Calder{\'o}n De La Barca S{\'a}nchez\}, M. and J. Carroll and J. Castillo and M. Castro and D. Cebra and P. Chaloupka and S. Chattopadhyay and Chen, \{H. F.\} and Y. Chen and Chernenko, \{S. P.\} and M. Cherney and A. Chikanian and B. Choi and W. Christie and J. Schambach and Zo{\l}nierczuk, \{P. A.\}",

note = "Publisher Copyright: {\textcopyright} 2004 The American Physical Society.",

year = "2004",

month = apr,

day = "30",

doi = "10.1103/PhysRevLett.92.171801",

language = "English",

volume = "92",

pages = "171801--1--171801--6",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "17",

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TY - JOUR

T1 - Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV

AU - STAR Collaboration

AU - Adams, J.

AU - Adler, C.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Amonett, J.

AU - Anderson, B. D.

AU - Anderson, M.

AU - Arkhipkin, D.

AU - Averichev, G. S.

AU - Badyal, S. K.

AU - Balewski, J.

AU - Barannikova, O.

AU - Barnby, L. S.

AU - Baudot, J.

AU - Bekele, S.

AU - Belaga, V. V.

AU - Bellwied, R.

AU - Berger, J.

AU - Bezverkhny, B. I.

AU - Bhardwaj, S.

AU - Bhaskar, P.

AU - Bhati, A. K.

AU - Bichsel, H.

AU - Billmeier, A.

AU - Bland, L. C.

AU - Blyth, C. O.

AU - Bonner, B. E.

AU - Botje, M.

AU - Boucham, A.

AU - Brandin, A.

AU - Bravar, A.

AU - Cadman, R. V.

AU - Cai, X. Z.

AU - Caines, H.

AU - Calderón De La Barca Sánchez, M.

AU - Carroll, J.

AU - Castillo, J.

AU - Castro, M.

AU - Cebra, D.

AU - Chaloupka, P.

AU - Chattopadhyay, S.

AU - Chen, H. F.

AU - Chen, Y.

AU - Chernenko, S. P.

AU - Cherney, M.

AU - Chikanian, A.

AU - Choi, B.

AU - Christie, W.

AU - Schambach, J.

AU - Zołnierczuk, P. A.

PY - 2004/4/30

Y1 - 2004/4/30

N2 - Measurements of the production of forward high-energy π0 mesons from transversely polarized proton collisions at √s = 200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at xF below about 0.3, and becomes positive and large at higher xF, similar to the trend in data at √s ≤ 20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with pT > 1 GeV=c at a polarized proton collider.

AB - Measurements of the production of forward high-energy π0 mesons from transversely polarized proton collisions at √s = 200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at xF below about 0.3, and becomes positive and large at higher xF, similar to the trend in data at √s ≤ 20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with pT > 1 GeV=c at a polarized proton collider.

UR - https://www.scopus.com/pages/publications/2942573615

U2 - 10.1103/PhysRevLett.92.171801

DO - 10.1103/PhysRevLett.92.171801

M3 - Article

AN - SCOPUS:2942573615

SN - 0031-9007

VL - 92

SP - 171801-1-171801-6

JO - Physical Review Letters

JF - Physical Review Letters

IS - 17

M1 - 171801

ER -

Cross sections and transverse single-spin asymmetries in forward neutral-pion production from proton collisions at √s = 200 GeV

Abstract

Funding

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