Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV

doi:10.1007/JHEP09(2019)108

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	Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV
	Acharya, S ; Adamova, D ; Adhya, SP ; Adler, A ; Adolfsson, J ; Aggarwal, MM ; Rinella, GA ; Agnello, M ; Agrawal, N ; Ahammed, Z
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2019
期号	9 页码:-
关键词	INTERFEROMETRY
ISSN号	1029-8479
DOI	10.1007/JHEP09(2019)108
文献子类	期刊论文
英文摘要	Two-particle correlations in high-energy collision experiments enable the extraction of particle source radii by using the Bose-Einstein enhancement of pion production at low relative momentum q proportional to 1/R. It was previously observed that in pp collisions at root s = 7 TeV the average pair transverse momentum k(T) range of such analyses is limited due to large background correlations which were attributed to mini-jet phenomena. To investigate this further, an event-shape dependent analysis of Bose-Einstein correlations for pion pairs is performed in this work. By categorizing the events by their transverse sphericity S-T into spherical (S-T > 0.7) and jet-like (S-T < 0.3) events a method was developed that allows for the determination of source radii for much larger values of k(T) for the first time. Spherical events demonstrate little or no background correlations while jet-like events are dominated by them. This observation agrees with the hypothesis of a mini-jet origin of the non-femtoscopic background correlations and gives new insight into the physics interpretation of the k(T) dependence of the radii. The emission source size in spherical events shows a substantially diminished k(T) dependence, while jet-like events show indications of a negative trend with respect to k(T) in the highest multiplicity events. Regarding the emission source shape, the correlation functions for both event sphericity classes show good agreement with an exponential shape, rather than a Gaussian one.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32049]
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
作者单位	1.HIP, Helsinki, Finland; 2.China Inst Atom Energy, Beijing, Peoples R China; 3.Chonbuk Natl Univ, Jeonju, South Korea; 4.Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia; 5.COMSATS Inst Informat Technol CIIT, Islamabad, Pakistan; 6.Creighton Univ, Omaha, NE 68178 USA; 7.Aligarh Muslim Univ, Dept Phys, Aligarh, Uttar Pradesh, India; 8.Pusan Natl Univ, Dept Phys, Pusan, South Korea; 9.Sejong Univ, Dept Phys, Seoul, South Korea; 10.Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA;
推荐引用方式 GB/T 7714	Acharya, S,Adamova, D,Adhya, SP,et al. Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV[J]. JOURNAL OF HIGH ENERGY PHYSICS,2019(9):-.
APA	Acharya, S.,Adamova, D.,Adhya, SP.,Adler, A.,Adolfsson, J.,...&Zinovjev, G.(2019).Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV.JOURNAL OF HIGH ENERGY PHYSICS(9),-.
MLA	Acharya, S,et al."Event-shape and multiplicity dependence of freeze-out radii in pp collisions at root s=7 TeV".JOURNAL OF HIGH ENERGY PHYSICS .9(2019):-.