Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

doi:10.1103/PhysRevC.96.054904

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	Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider
	Adamczyk, L; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Ajitanand, NN; Alekseev, I; Anderson, DM; Aoyama, R; Aparin, A
刊名	PHYSICAL REVIEW C
	2017
卷号	96 期号:5 页码:-
关键词	J/psi Photoproduction Peripheral Collisions Star Interference Dissociation Parameters Energies Mass Lhc
ISSN号	2469-9985
DOI	10.1103/PhysRevC.96.054904
文献子类	期刊论文
英文摘要	The STAR Collaboration reports on the photoproduction of pi(+) pi(-) pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly real photon emitted by one ion scatters from the other ion. We fit the pi(+) pi(-) invariant-mass spectrum with a combination of rho(0) and omega resonances and a direct pi(+) pi(-) continuum. This is the first observation of the omega in ultraperipheral collisions, and the first measurement of rho-omega interference at energies where photoproduction is dominated by Pomeron exchange. The omega amplitude is consistent with the measured gamma p -> omega p cross section, a classical Glauber calculation, and the omega -> pi(+) pi(-) branching ratio. The omega phase angle is similar to that observed at much lower energies, showing that the rho-omega phase difference does not depend significantly on photon energy. The rho(0) differential cross section d sigma/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.
WOS关键词	J/PSI PHOTOPRODUCTION ; PERIPHERAL COLLISIONS ; STAR ; INTERFERENCE ; DISSOCIATION ; PARAMETERS ; ENERGIES ; MASS ; LHC
语种	英语
WOS记录号	WOS:000414957500004
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/28582]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
推荐引用方式 GB/T 7714	Adamczyk, L,Adkins, JK,Agakishiev, G,et al. Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider[J]. PHYSICAL REVIEW C,2017,96(5):-.
APA	Adamczyk, L.,Adkins, JK.,Agakishiev, G.,Aggarwal, MM.,Ahammed, Z.,...&Zyzak, M.(2017).Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider.PHYSICAL REVIEW C,96(5),-.
MLA	Adamczyk, L,et al."Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider".PHYSICAL REVIEW C 96.5(2017):-.