rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV

doi:10.1103/PhysRevC.77.034910

	rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV
	Abelev, B. I.1,11; Aggarwal, M. M.33; Ahammed, Z.48; Anderson, B. D.21; Arkhipkin, D.15; Averichev, G. S.14; Bai, Y.30,31; Balewski, J.19; Barannikova, O.1,11; Barnby, L. S.3
刊名	PHYSICAL REVIEW C
	2008-03-01
卷号	77 页码:11
ISSN号	0556-2813
DOI	10.1103/PhysRevC.77.034910
英文摘要	Photoproduction reactions occur when the electromagnetic field of a relativistic heavy ion interacts with another heavy ion. The STAR Collaboration presents a measurement of rho(0) and direct pi(+)pi(-) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN) = 200 GeV. We observe both exclusive photoproduction and photoproduction accompanied by mutual Coulomb excitation. We find a coherent cross section of sigma(AuAu -> AuAurho(0)) = 530 +/- 19(stat.) +/- 57(syst.) mb, in accord with theoretical calculations based on a Glauber approach, but considerably below the predictions of a color dipole model. The rho 0 transverse momentum spectrum (p(T)(2)) is fit by a double exponential curve including both coherent and incoherent coupling to the target nucleus; we find sigma(inc)/sigma(coh) = 0.29 +/- 0.03 (stat.) +/- 0.08 (syst.). The ratio of direct pi(+)pi(-) to rho(0) production is comparable to that observed in gamma(p) collisions at HERA and appears to be independent of photon energy. Finally, the measured rho(0) spin helicity matrix elements agree within errors with the expected s-channel helicity conservation.
资助项目	Science and Technology Facilities Council[PP/F001061/1]
WOS关键词	TIME PROJECTION CHAMBER ; VECTOR-MESON PRODUCTION ; DIFFRACTIVE PRODUCTION ; PROTON SCATTERING ; COMPLEX NUCLEI ; PHOTON ; HERA ; COLLIDERS ; ENERGIES ; PHYSICS
WOS研究方向	Physics
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000254543500050
内容类型	期刊论文
源URL	[http://119.78.100.186/handle/113462/29367]
专题	中国科学院近代物理研究所
通讯作者	Abelev, B. I.
作者单位	1.Univ Illinois, Chicago, IL 60607 USA 2.Argonne Natl Lab, Argonne, IL 60439 USA 3.Univ Birmingham, Birmingham, W Midlands, England 4.Brookhaven Natl Lab, Upton, NY 11973 USA 5.CALTECH, Pasadena, CA 91125 USA 6.Univ Calif Berkeley, Berkeley, CA 94720 USA 7.Univ Calif Davis, Davis, CA 95616 USA 8.Univ Calif Los Angeles, Los Angeles, CA 90095 USA 9.Univ Estadual Campinas, Sao Paulo, Brazil 10.Carnegie Mellon Univ, Pittsburgh, PA 15213 USA
推荐引用方式 GB/T 7714	Abelev, B. I.,Aggarwal, M. M.,Ahammed, Z.,et al. rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV[J]. PHYSICAL REVIEW C,2008,77:11.
APA	Abelev, B. I..,Aggarwal, M. M..,Ahammed, Z..,Anderson, B. D..,Arkhipkin, D..,...&Zuo, J. X..(2008).rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV.PHYSICAL REVIEW C,77,11.
MLA	Abelev, B. I.,et al."rho(0) photoproduction in ultraperipheral relativistic heavy ion collisions at root s(NN)=200 GeV".PHYSICAL REVIEW C 77(2008):11.