Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at root s=200 GeV with the STAR detector at RHIC

doi:10.1007/JHEP07(2020)178

	Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at root s=200 GeV with the STAR detector at RHIC
	Adam, J.; Adamczyk, L.7; Adams, J. R.3; Adkins, J. K.40; Agakishiev, G.31; Aggarwal, M. M.29; Ahammed, Z.42; Alekseev, I.61; Anderson, D. M.4,36; Aparin, A.56
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2020-07-24
期号	7 页码:46
关键词	Diffraction Forward physics Hadron-Hadron scattering (experiments)
ISSN号	1029-8479
DOI	10.1007/JHEP07(2020)178
通讯作者	Adamczyk, L.(leszek.adamczyk@agh.edu.pl)
英文摘要	We report on the measurement of the Central Exclusive Production of charged particle pairs h(+)h(-) (h = pi; K; p) with the STAR detector at RHIC in proton-proton collisions at root s = 200 GeV. The charged particle pairs produced in the reaction pp -> p' + h(+) h(-) + p' are reconstructed from the tracks in the central detector and identified using the specific energy loss and the time of flight method, while the forward-scattered protons are measured in the Roman Pot system. Exclusivity of the event is guaranteed by requiring the transverse momentum balance of all four final-state particles. Differential cross sections are measured as functions of observables related to the central hadronic final state and to the forward-scattered protons. They are measured in a fiducial region corresponding to the acceptance of the STAR detector and determined by the central particles' transverse momenta and pseudorapidities as well as by the forward-scattered protons' momenta. This fiducial region roughly corresponds to the square of the four-momentum transfers at the proton vertices in the range 0:04 GeV2 < -t(1); -t(2) < 0:2 GeV2, invariant masses of the charged particle pairs up to a few GeV and pseudorapidities of the centrallyproduced hadrons in the range vertical bar eta vertical bar < 0:7. The measured cross sections are compared to phenomenological predictions based on the Double Pomeron Exchange (DPE) model. Structures observed in the mass spectra of pi(+)pi(-) and K+K- pairs are consistent with the DPE model, while angular distributions of pions suggest a dominant spin-0 contribution to pi(+)pi(-)production. For pi(+)pi(-) production, the fiducial cross section is extrapolated to the Lorentz-invariant region, which allows decomposition of the invariant mass spectrum into continuum and resonant contributions. The extrapolated cross section is well described by the continuum production and at least three resonances, the f(0) (980), f(2) (1270) and f(0)(1500), with a possible small contribution from the f(0)(1370). Fits to the extrapolated differential cross section as a function of t(1) and t(2) enable extraction of the exponential slope parameters in several bins of the invariant mass of pi(+)pi(-) pairs. These parameters are sensitive to the size of the interaction region.
资助项目	RHIC Operations Group at BNL ; RCF at BNL ; NERSC Center at LBNL ; Open Science Grid consortium ; Office of Nuclear Physics within 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 of the Government of India ; 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	2-PHOTON PRODUCTION ; PION ; ETA
WOS研究方向	Physics
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000553028400001
资助机构	RHIC Operations Group at BNL ; RCF at BNL ; NERSC Center at LBNL ; Open Science Grid consortium ; Office of Nuclear Physics within 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 of the Government of India ; 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/113462/140200]
专题	中国科学院近代物理研究所
通讯作者	Adamczyk, L.
作者单位	1.Valparaiso Univ, Valparaiso, IN 46383 USA 2.Abilene Christian Univ, Abilene, TX 79699 USA 3.AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland 4.Alikhanov Inst Theoret Expt Phys NRC, Kurchatov Inst, 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. Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at root s=200 GeV with the STAR detector at RHIC[J]. JOURNAL OF HIGH ENERGY PHYSICS,2020(7):46.
APA	Adam, J..,Adamczyk, L..,Adams, J. R..,Adkins, J. K..,Agakishiev, G..,...&Zyzak, M..(2020).Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at root s=200 GeV with the STAR detector at RHIC.JOURNAL OF HIGH ENERGY PHYSICS(7),46.
MLA	Adam, J.,et al."Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at root s=200 GeV with the STAR detector at RHIC".JOURNAL OF HIGH ENERGY PHYSICS .7(2020):46.