Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at s\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s} $$\end{document} = 200 GeV with the STAR detector at RHIC

被引：0
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作者：
J. Adam
L. Adamczyk
J. R. Adams
J. K. Adkins
G. Agakishiev
M. M. Aggarwal
Z. Ahammed
I. Alekseev
D. M. Anderson
A. Aparin
E. C. Aschenauer
M. U. Ashraf
F. G. Atetalla
A. Attri
G. S. Averichev
V. Bairathi
K. Barish
A. Behera
R. Bellwied
A. Bhasin
J. Bielcik
J. Bielcikova
L. C. Bland
I. G. Bordyuzhin
J. D. Brandenburg
A. V. Brandin
J. Butterworth
H. Caines
M. Calderón de la Barca Sánchez
D. Cebra
I. Chakaberia
P. Chaloupka
B. K. Chan
F-H. Chang
Z. Chang
N. Chankova-Bunzarova
A. Chatterjee
D. Chen
J. H. Chen
X. Chen
Z. Chen
J. Cheng
M. Cherney
M. Chevalier
S. Choudhury
W. Christie
X. Chu
H. J. Crawford
M. Csanád
M. Daugherity
机构：
[1] Abilene Christian University,Institute of Modern Physics
[2] AGH University of Science and Technology,Shanghai Institute of Applied Physics
[3] FPACS,Instituto de Alta Investigación
[4] Alikhanov Institute for Theoretical and Experimental Physics NRC “Kurchatov Institute”,undefined
[5] Argonne National Laboratory,undefined
[6] American University of Cairo,undefined
[7] Brookhaven National Laboratory,undefined
[8] University of California,undefined
[9] University of California,undefined
[10] University of California,undefined
[11] University of California,undefined
[12] Central China Normal University,undefined
[13] University of Illinois at Chicago,undefined
[14] Creighton University,undefined
[15] Czech Technical University in Prague,undefined
[16] FNSPE,undefined
[17] Technische Universität Darmstadt,undefined
[18] ELTE Eötvös Loránd University,undefined
[19] Frankfurt Institute for Advanced Studies FIAS,undefined
[20] Fudan University,undefined
[21] University of Heidelberg,undefined
[22] University of Houston,undefined
[23] Huzhou University,undefined
[24] Indian Institute of Science Education and Research (IISER),undefined
[25] Indian Institute of Science Education and Research (IISER) Tirupati,undefined
[26] Indian Institute Technology,undefined
[27] Indiana University,undefined
[28] Chinese Academy of Sciences,undefined
[29] University of Jammu,undefined
[30] Joint Institute for Nuclear Research,undefined
[31] Kent State University,undefined
[32] University of Kentucky,undefined
[33] Lawrence Berkeley National Laboratory,undefined
[34] Lehigh University,undefined
[35] Max-Planck-Institut für Physik,undefined
[36] Michigan State University,undefined
[37] National Research Nuclear University MEPhI,undefined
[38] National Institute of Science Education and Research,undefined
[39] HBNI,undefined
[40] National Cheng Kung University,undefined
[41] Nuclear Physics Institute of the CAS,undefined
[42] Ohio State University,undefined
[43] Institute of Nuclear Physics PAN,undefined
[44] Panjab University,undefined
[45] Pennsylvania State University,undefined
[46] NRC “Kurchatov Institute”,undefined
[47] Institute of High Energy Physics,undefined
[48] Purdue University,undefined
[49] Rice University,undefined
[50] Rutgers University,undefined
来源：
Journal of High Energy Physics | / 2020卷 / 7期
关键词：
Diffraction; Forward physics; Hadron-Hadron scattering (experiments);
D O I：
10.1007/JHEP07(2020)178
中图分类号：
学科分类号：
摘要：
We report on the measurement of the Central Exclusive Production of charged particle pairs h+h− (h = π, K, p) with the STAR detector at RHIC in proton-proton collisions at s\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \sqrt{s} $$\end{document} = 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< −t1, −t2< 0.2 GeV2, invariant masses of the charged particle pairs up to a few GeV and pseudorapidities of the centrally-produced hadrons in the range |η| < 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 π+π− and K+K− pairs are consistent with the DPE model, while angular distributions of pions suggest a dominant spin-0 contribution to π+π− production. For π+π− 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 f0(980), f2(1270) and f0(1500), with a possible small contribution from the f0(1370). Fits to the extrapolated differential cross section as a function of t1 and t2 enable extraction of the exponential slope parameters in several bins of the invariant mass of π+π− pairs. These parameters are sensitive to the size of the interaction region.
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