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

被引：0

作者：

Adam, J. ^{[6
,30
,52
,63
]}

Adamczyk, L. ^{[2
,6
,52
,63
]}

Adams, J. R. ^{[2
,39
,63
]}

Adkins, J. K. ^{[30
,39
,63
]}

Agakishiev, G. ^{[28
,30
,63
]}

Aggarwal, M. M. ^{[28
,41
,63
]}

Ahammed, Z. ^{[41
,61
]}

Alekseev, I. ^{[3
,35
]}

Anderson, D. M. ^{[3
,55
]}

Aparin, A. ^{[28
,55
]}

Aschenauer, E. C. ^{[6
,28
]}

Ashraf, M. U. ^{[6
,11
]}

Atetalla, F. G. ^{[11
,29
]}

Attri, A. ^{[29
,41
]}

Averichev, G. S. ^{[28
,41
]}

Bairathi, V. ^{[28
,53
]}

Barish, K. ^{[10
,11
,53
]}

Behera, A. ^{[10
,52
]}

Bellwied, R. ^{[20
,52
]}

Bhasin, A. ^{[20
,27
]}

Bielcik, J. ^{[14
,27
]}

Bielcikova, J. ^{[14
,38
]}

Bland, L. C. ^{[6
,38
]}

Bordyuzhin, I. G. ^{[3
,6
,7
]}

Brandenburg, J. D. ^{[3
,6
,49
]}

Brandin, A. V. ^{[35
]}

Butterworth, J. ^{[45
]}

Caines, H. ^{[45
,64
]}

Calderon de la Barca Sanchez, M. ^{[8
,64
]}

Cebra, D. ^{[8
]}

Chakaberia, I. ^{[6
,8
,29
]}

Chaloupka, P. ^{[6
,14
,29
]}

Chan, B. K. ^{[9
,14
]}

Chang, F-H. ^{[9
,37
]}

Chang, Z. ^{[6
]}

Chankova-Bunzarova, N. ^{[6
,28
]}

Chatterjee, A. ^{[11
,28
]}

Chen, D. ^{[10
,11
]}

Chen, J. H. ^{[10
,18
]}

Chen, X. ^{[18
,48
]}

Chen, Z. ^{[48
,49
]}

Cheng, J. ^{[49
,57
]}

Cherney, M. ^{[13
,57
]}

Chevalier, M. ^{[10
,11
,13
]}

Choudhury, S. ^{[10
,18
]}

Christie, W. ^{[6
,18
]}

Chu, X. ^{[6
]}

Crawford, H. J. ^{[6
,7
]}

Csanad, M. ^{[7
,16
]}

Daugherity, M. ^{[1
,16
]}

机构：

[1] Abilene Christian Univ, Abilene, TX 79699 USA

[2] AGH Univ Sci & Technol, FPACS, PL-30059 Krakow, Poland

[3] Alikhanov Inst Theoret Expt Phys NRC, Kurchatov Inst, Moscow 117218, Russia

[4] Argonne Natl Lab, Argonne, IL 60439 USA

[5] Amer Univ Cairo, New Cairo 11835, Egypt

[6] Brookhaven Natl Lab, Upton, NY 11973 USA

[7] Univ Calif Berkeley, Berkeley, CA 94720 USA

[8] Univ Calif Davis, Davis, CA 95616 USA

[9] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[10] Univ Calif Riverside, Riverside, CA 92521 USA

[11] Cent China Normal Univ, Wuhan 430079, Hubei, Peoples R China

[12] Univ Illinois, Chicago, IL 60607 USA

[13] Creighton Univ, Omaha, NE 68178 USA

[14] Czech Tech Univ, FNSPE, Prague 11519, Czech Republic

[15] Tech Univ Darmstadt, D-64289 Darmstadt, Germany

[16] Eotvos Lorand Univ, H-1117 Budapest, Hungary

[17] Frankfurt Inst Adv Studies FIAS, D-60438 Frankfurt, Germany

[18] Fudan Univ, Shanghai 200433, Peoples R China

[19] Heidelberg Univ, D-69120 Heidelberg, Germany

[20] Univ Houston, Houston, TX 77204 USA

[21] Huzhou Univ, Huzhou 313000, Zhejiang, Peoples R China

[22] Indian Inst Sci Educ Res IISER, Berhampur 760010, India

[23] Indian Inst Sci Educ Res IISER, Tirupati 517507, India

[24] Indian Inst Technol, Patna 801106, Bihar, India

[25] Indiana Univ, Bloomington, IN 47408 USA

[26] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[27] Univ Jammu, Jammu 180001, India

[28] Joint Inst Nucl Res, Dubna 141980, Russia

[29] Kent State Univ, Kent, OH 44242 USA

[30] Univ Kentucky, Lexington, KY 40506 USA

[31] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[32] Lehigh Univ, Bethlehem, PA 18015 USA

[33] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[34] Michigan State Univ, E Lansing, MI 48824 USA

[35] Natl Res Nucl Univ MEPhI, Moscow 115409, Russia

[36] Natl Inst Sci Educ & Res, HBNI, Jatni 752050, India

[37] Natl Cheng Kung Univ, Tainan 70101, Taiwan

[38] CAS, Nucl Phys Inst, Rez 25068, Czech Republic

[39] Ohio State Univ, Columbus, OH 43210 USA

[40] Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[41] Panjab Univ, Chandigarh 160014, India

[42] Penn State Univ, University Pk, PA 16802 USA

[43] NRC Kurchatov Inst, Inst High Energy Phys, Protvino 142281, Russia

[44] Purdue Univ, W Lafayette, IN 47907 USA

[45] Rice Univ, Houston, TX 77251 USA

[46] Rutgers State Univ, Piscataway, NJ 08854 USA

[47] Univ Sao Paulo, BR-05314970 Sao Paulo, Brazil

[48] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China

[49] Shandong Univ, Qingdao 266237, Shandong, Peoples R China

[50] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2020年 / 07期

基金：

新加坡国家研究基金会; 日本学术振兴会; 中国国家自然科学基金; 美国国家科学基金会;

关键词：

Diffraction; Forward physics; Hadron-Hadron scattering (experiments); 2-PHOTON PRODUCTION; PION; CHANNELS; ETA;

D O I：

10.1007/JHEP07(2020)178

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

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.

引用

页数：46

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