Abstract
The energy dependence of the single-transverse-spin asymmetry, A N, and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at the Relativistic Heavy Ion Collider for polarized p+p collisions at √s=200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with a momentum fraction of xF=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with xF scaling, compared to measurements by an experiment at the Intersecting Storage Ring, which measured neutron production in unpolarized p+p collisions at √s=30.6-62.7 GeV. The cross sections for large xF neutron production for p+p collisions, as well as those in e+p collisions measured at the Hadron-Electron Ring Accelerator, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching AN=-0.08±0.02 for xF=0.8; the measured backward asymmetries, for negative xF, were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.
| Original language | American English |
|---|---|
| Article number | 032006 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 88 |
| Issue number | 3 |
| DOIs | |
| State | Published - 8 Aug 2013 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)
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In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 88, No. 3, 032006, 08.08.2013.
Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Inclusive cross section and single transverse spin asymmetry for very forward neutron production in polarized p+p collisions at √s=200 GeV
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N1 - Office of Nuclear Physics in the Office of Science of the Department of Energy; National Science Foundation; Renaissance Technologies LLC; Abilene Christian University Research Council; Research Foundation of SUNY; College of Arts and Sciences, Vanderbilt University (USA); Ministry of Education, Culture, Sports, Science, and Technology (Japan); Japan Society for the Promotion of Science (Japan); Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Brazil); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Brazil); Natural Science Foundation of China (People's Republic of China); Ministry of Education, Youth and Sports (Czech Republic); Centre National de la Recherche Scientifique (France); Commissariat a l'Energie Atomique (France); Institut National de Physique Nucleaire et de Physique des Particules (France); Bundesministerium fur Bildung und Forschung (Germany); Deutscher Akademischer Austausch Dienst (Germany); Alexander von Humboldt Stiftung (Germany); Hungarian National Science Fund, OTKA (Hungary); Department of Atomic Energy (India); Department of Science and Technology (India); Israel Science Foundation (Israel); National Research Foundation of the Ministry Education Science and Technology (Korea); WCU program of the Ministry Education Science and Technology (Korea); Ministry of Education and Science (Russia); Russian Academy of Sciences (Russia); Federal Agency of Atomic Energy (Russia); VR (Sweden); Wallenberg Foundation (Sweden); U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union; US-Hungarian Fulbright Foundation for Educational Exchange; US-Israel Binational Science FoundationWe thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy; t
PY - 2013/8/8
Y1 - 2013/8/8
N2 - The energy dependence of the single-transverse-spin asymmetry, A N, and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at the Relativistic Heavy Ion Collider for polarized p+p collisions at √s=200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with a momentum fraction of xF=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with xF scaling, compared to measurements by an experiment at the Intersecting Storage Ring, which measured neutron production in unpolarized p+p collisions at √s=30.6-62.7 GeV. The cross sections for large xF neutron production for p+p collisions, as well as those in e+p collisions measured at the Hadron-Electron Ring Accelerator, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching AN=-0.08±0.02 for xF=0.8; the measured backward asymmetries, for negative xF, were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.
AB - The energy dependence of the single-transverse-spin asymmetry, A N, and the cross section for neutron production at very forward angles were measured in the PHENIX experiment at the Relativistic Heavy Ion Collider for polarized p+p collisions at √s=200 GeV. The neutrons were observed in forward detectors covering an angular range of up to 2.2 mrad. We report results for neutrons with a momentum fraction of xF=0.45 to 1.0. The energy dependence of the measured cross sections were consistent with xF scaling, compared to measurements by an experiment at the Intersecting Storage Ring, which measured neutron production in unpolarized p+p collisions at √s=30.6-62.7 GeV. The cross sections for large xF neutron production for p+p collisions, as well as those in e+p collisions measured at the Hadron-Electron Ring Accelerator, are described by a pion exchange mechanism. The observed forward neutron asymmetries were large, reaching AN=-0.08±0.02 for xF=0.8; the measured backward asymmetries, for negative xF, were consistent with zero. The observed asymmetry for forward neutron production is discussed within the pion exchange framework, with interference between the spin-flip amplitude due to the pion exchange and nonflip amplitudes from all Reggeon exchanges. Within the pion exchange description, the measured neutron asymmetry is sensitive to the contribution of other Reggeon exchanges even for small amplitudes.
UR - http://www.scopus.com/inward/record.url?scp=84884835871&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevD.88.032006
DO - https://doi.org/10.1103/PhysRevD.88.032006
M3 - Article
SN - 1550-7998
VL - 88
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 3
M1 - 032006
ER -