Production of the charmonium states χc1 and χc2 in proton nucleus interactions at √s=41.6 GeV

被引：29

作者：

Abt, I. ^{[1
,24
]}

Adams, M. ^{[11
]}

Agari, M. ^{[14
]}

Albrecht, H. ^{[13
]}

Aleksandrov, A. ^{[30
]}

Amaral, V. ^{[9
]}

Amorim, A. ^{[9
]}

Aplin, S. J. ^{[13
]}

Aushev, V. ^{[17
]}

Bagaturia, Y. ^{[13
,40
]}

Balagura, V. ^{[23
]}

Bargiotti, M. ^{[6
,38
]}

Barsukova, O. ^{[12
]}

Bastos, J. ^{[9
]}

Batista, J. ^{[9
]}

Bauer, C. ^{[14
]}

Bauer, Th. S. ^{[37
]}

Belkov, A. ^{[12
]}

Belkov, Ar. ^{[12
]}

Belotelov, I. ^{[12
]}

Bertin, A. ^{[6
,38
]}

Bobchenko, B. ^{[23
]}

Boecker, M. ^{[27
]}

Bogatyrev, A. ^{[23
]}

Bohm, G. ^{[30
]}

Braeuer, M. ^{[14
]}

Bruinsma, M. ^{[29
,37
]}

Bruschi, M. ^{[6
,38
]}

Buchholz, P. ^{[27
]}

Buran, T. ^{[25
]}

Carvalho, J. ^{[9
]}

Conde, P. ^{[2
,13
]}

Cruse, C. ^{[11
]}

Dam, M. ^{[10
]}

Danielsen, K. M. ^{[25
]}

Danilov, M. ^{[23
]}

De Castro, S. ^{[6
]}

Deppe, H. ^{[15
]}

Dong, X. ^{[3
]}

Dreis, H. B. ^{[15
]}

Egorytchev, V. ^{[13
]}

Ehret, K. ^{[11
]}

Eisele, F. ^{[15
]}

Emeliyanov, D. ^{[13
]}

Essenov, S. ^{[23
]}

Fabbri, L. ^{[6
,38
]}

Faccioli, P. ^{[6
,38
]}

Feuerstack-Raible, M. ^{[15
]}

Flammer, J. ^{[13
]}

Fominykh, B. ^{[13
,23
]}

机构：

[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[2] Univ Barcelona, Dept ECM, Fac Phys, E-08028 Barcelona, Spain

[3] Inst High Energy Phys, Beijing 100039, Peoples R China

[4] Tsinghua Univ, Inst Engn Phys, Beijing 100084, Peoples R China

[5] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[6] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy

[7] Fdn Giuseppe Occhialini, I-61034 Fossombrone, Pesaro Urbino, Italy

[8] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA

[9] LIP Coimbra, P-3004516 Coimbra, Portugal

[10] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[11] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany

[12] Joint Inst Nucl Res, Dubna 141980, Moscow, Russia

[13] DESY, D-22603 Hamburg, Germany

[14] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany

[15] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[16] Univ Houston, Dept Phys, Houston, TX 77204 USA

[17] Ukrainian Acad Sci, Inst Nucl Res, UA-03680 Kiev, Ukraine

[18] Jozef Stefan Inst, Ljubljana 1001, Slovenia

[19] Univ Ljubljana, Ljubljana 1001, Slovenia

[20] Univ Calif Los Angeles, Los Angeles, CA 90024 USA

[21] Univ Mannheim, Lehrstuhl Informat 5, D-68131 Mannheim, Germany

[22] Univ Maribor, Maribor 2000, Slovenia

[23] Inst Theoret & Expt Phys, Moscow 117218, Russia

[24] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[25] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[26] Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany

[27] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[28] INRNE BAS, Sofia, Bulgaria

[29] Univ Utrecht, NIKHEF, NL-3584 CB Utrecht, Netherlands

[30] DESY, D-15738 Zeuthen, Germany

[31] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[32] Univ Florence, Dipartimento Energet, I-50121 Florence, Italy

[33] PN Lebedev Phys Inst, Moscow 117924, Russia

[34] Moscow Phys Engn Inst, Moscow 115409, Russia

[35] Moscow MV Lomonosov State Univ, Moscow 119992, Russia

[36] Inst High Energy Phys, Protvino, Russia

[37] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[38] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy

[39] Ist Nazl Fis Nucl, Sez Bologna, Bologna, Italy

[40] Inst High Energy Phys, GE-380086 Tbilisi, Georgia

来源：

PHYSICAL REVIEW D | 2009年 / 79卷 / 01期

基金：

瑞士国家科学基金会; 美国国家科学基金会;

关键词：

OUTER TRACKER DETECTOR; HERA-B EXPERIMENT; J/PSI PRODUCTION; P(P)OVER-BAR COLLISIONS; HADRONIC PRODUCTION; PSI; SUPPRESSION; QUARKONIUM; TARGET; DECAY;

D O I：

10.1103/PhysRevD.79.012001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A measurement of the ratio R-chi c = (chi(c) --> J/psi + gamma)/J/psi in pC, pTi, and pW interactions at 920 GeV/c (root s = 41.6 GeV) in the Feynman-x range -0.35 < x(F)(J/psi) < 0.15 is presented. Both mu(+)mu(-) and e(+)e(-) J/psi decay channels are observed with an overall statistics of about 15 000 chi(c) events, which is by far the largest available sample in pA collisions. The result is R chi(c) = 0.188 +/- 0.013(st-0.022sys)(+0.024) averaged ratio R-12 = R-chi c1/R-chi c2 is measured to be 1.02 +/- 0.40, leading to a cross section ratio sigma(chi(c1))/sigma(chi(c2)) = 0.57 +/- 0.23. The dependence of R-chi c on the Feynman-x of the J/psi, x(F)(J/psi), and its transverse momentum, p(T)(J/psi), is studied, as well as its dependence on the atomic number, A, of the target. For the first time, an extensive study of possible biases on R-chi c and R-12 due to the dependence of acceptance on the polarization states of J/psi and chi(c) is performed. By varying the polarization parameter, lambda(obs), of all produced J/psi's by two sigma around the value measured by HERA-B, and considering the maximum variation due to the possible chi(c1) and chi(c2) polarizations, it is shown that R-chi c could change by a factor between 1.02 and 1.21 and R-12 by a factor between 0.89 and 1.16.

引用

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