Comparison of transverse single-spin asymmetries for forward pi(0) production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy root s(NN)=200 GeV

doi:10.1103/PhysRevD.103.072005

	Comparison of transverse single-spin asymmetries for forward pi(0) production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy root s(NN)=200 GeV
	Adam, J.7; Adamczyk, L.3; Adams, J. R.39; Adkins, J. K.30; Agakishiev, G.28; Aggarwal, M. M.41; Ahammed, Z.61; Alekseev, I 4,35; Anderson, D. M.55; Aparin, A.28
刊名	PHYSICAL REVIEW D
	2021-04-16
卷号	103 期号:7 页码:20
ISSN号	2470-0010
DOI	10.1103/PhysRevD.103.072005
通讯作者	Adam, J.()
英文摘要	The STAR collaboration reports a measurement of the transverse single-spin asymmetries, A(N), for neutral pions produced in polarized proton collisions with protons (pp), with aluminum nuclei (pAl) and with gold nuclei (pAu) at a nucleon-nucleon center-of-mass energy of 200 GeV. Neutral pions are observed in the forward direction relative to the transversely polarized proton beam, in the pseudorapidity region 2.7 < eta < 3.8. Results are presented for pi(0)s observed in the STAR forward meson spectrometer electromagnetic calorimeter in narrow Feynman x (x(F)) and transverse momentum (p(T)) bins, spanning the range 0.17 < x(F) < 0.81 and 1.7 < p(T) < 6.0 GeV/c. For fixed x(F) < 0.47, the asymmetries are found to rise with increasing transverse momentum. For larger x(F), the asymmetry flattens or falls as p(T) increases. Parametrizing the ratio r(A) = A(N)(pA)/A(N)(pp) = A(P) over the kinematic range, the ratio r(A) is found to depend only weakly on A, with < P > = -0.027 +/- 0.005. No significant difference in P is observed between the low-p(T) region, p(T) < 2.5 GeV/c, where gluon saturation effects may play a role, and the high-p(T) region, p(T) > 2.5 GeV/c. It is further observed that the value of A(N) is significantly larger for events with a large-p(T) isolated pi(0) than for events with a nonisolated pi(0) accompanied by additional jetlike fragments. The nuclear dependence r(A) is similar for isolated and nonisolated pi(0) events.
资助项目	RHIC Operations Group ; RCF at BNL ; NERSC Center at LBNL ; Open Science Grid consortium ; Office of Nuclear Physicswithin the U.S. DOE Office of Science ; U.S. National Science Foundation ; Ministry of Education and Science of the Russian Federation ; National Natural Science Foundation of China ; Chinese Academy of Science ; Ministry of Science and Technology of China ; Chinese Ministry of Education ; Higher Education Sprout Project by Ministry of Education at NCKU ; National Research Foundation of Korea ; Czech Science Foundation ; Ministry of Education, Youth and Sports of the Czech Republic ; Hungarian National Research, Development and Innovation Office ; New National Excellency Programme of the Hungarian Ministry of Human Capacities ; Department of Atomic Energy ; Department of Science and Technology of the Government of India ; National Science Centre of Poland ; Ministry of Science, Education and Sports of the Republic of Croatia ; RosAtom of Russia ; German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF) ; Helmholtz Association ; Ministry of Education, Culture, Sports, Science, and Technology (MEXT) ; Japan Society for the Promotion of Science (JSPS)
WOS关键词	INELASTIC-SCATTERING ; CROSS-SECTIONS ; DRELL-YAN
WOS研究方向	Astronomy & Astrophysics ; Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000648577400001
资助机构	RHIC Operations Group ; RCF at BNL ; NERSC Center at LBNL ; Open Science Grid consortium ; Office of Nuclear Physicswithin the U.S. DOE Office of Science ; U.S. National Science Foundation ; Ministry of Education and Science of the Russian Federation ; National Natural Science Foundation of China ; Chinese Academy of Science ; Ministry of Science and Technology of China ; Chinese Ministry of Education ; Higher Education Sprout Project by Ministry of Education at NCKU ; National Research Foundation of Korea ; Czech Science Foundation ; Ministry of Education, Youth and Sports of the Czech Republic ; Hungarian National Research, Development and Innovation Office ; New National Excellency Programme of the Hungarian Ministry of Human Capacities ; Department of Atomic Energy ; Department of Science and Technology of the Government of India ; National Science Centre of Poland ; Ministry of Science, Education and Sports of the Republic of Croatia ; RosAtom of Russia ; German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF) ; Helmholtz Association ; Ministry of Education, Culture, Sports, Science, and Technology (MEXT) ; Japan Society for the Promotion of Science (JSPS)
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/137540]
专题	中国科学院近代物理研究所
通讯作者	Adam, J.
作者单位	1.Univ Illinois, Chicago, IL 60607 USA 2.Abilene Christian Univ, Abilene, TX 79699 USA 3.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland 4.NRC Kurchatov Inst, Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia 5.Argonne Natl Lab, Argonne, IL 60439 USA 6.Amer Univ Cairo, New Cairo 11835, Egypt 7.Brookhaven Natl Lab, Upton, NY 11973 USA 8.Univ Calif Berkeley, Berkeley, CA 94720 USA 9.Univ Calif Davis, Davis, CA 95616 USA 10.Univ Calif Los Angeles, Los Angeles, CA 90095 USA
推荐引用方式 GB/T 7714	Adam, J.,Adamczyk, L.,Adams, J. R.,et al. Comparison of transverse single-spin asymmetries for forward pi(0) production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy root s(NN)=200 GeV[J]. PHYSICAL REVIEW D,2021,103(7):20.
APA	Adam, J..,Adamczyk, L..,Adams, J. R..,Adkins, J. K..,Agakishiev, G..,...&Zyzak, M..(2021).Comparison of transverse single-spin asymmetries for forward pi(0) production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy root s(NN)=200 GeV.PHYSICAL REVIEW D,103(7),20.
MLA	Adam, J.,et al."Comparison of transverse single-spin asymmetries for forward pi(0) production in polarized pp, pAl and pAu collisions at nucleon pair c.m. energy root s(NN)=200 GeV".PHYSICAL REVIEW D 103.7(2021):20.