A Measurement of the ψ′ to J/ψ production ratio in 920 GeV proton-nucleus interactions

被引:38
作者
Abt, I. [1 ]
Adams, M.
Agari, M.
Albrecht, H.
Aleksandrov, A.
Amaral, V.
Amorim, A.
Aplin, S. J.
Aushev, V.
Bagaturia, Y.
Balagura, V.
Bargiotti, M.
Barsukova, O.
Bastos, J.
Batista, J.
Bauer, C.
Bauer, T. S.
Belkov, A.
Belkov, A.
Belotelov, I.
Bertin, A.
Bobchenko, B.
Boecker, M.
Bogatyrev, A.
Bohm, G.
Braeuer, M.
Bruinsma, M.
Bruschi, M.
Buchholz, P.
Buran, T.
Carvalho, J.
Conde, P.
Cruse, C.
Dam, M.
Danielsen, K. M.
Danilov, M.
De Castro, S.
Deppe, H.
Dong, X.
Dreis, H. B.
Egorytchev, V.
Ehret, K.
Eisele, F.
Emeliyanov, D.
Essenov, S.
Fabbri, L.
Faccioli, P.
Feuerstack-Raible, M.
Flammer, J.
Fominykh, B.
机构
[1] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany
[2] NIKHEF H, NL-1009 DB Amsterdam, Netherlands
[3] Univ Barcelona, Fac Phys, Dept ECM, E-08028 Barcelona, Spain
[4] Inst High Energy Phys, Beijing 100039, Peoples R China
[5] Tsinghua Univ, Inst Engn Phys, Beijing 100084, Peoples R China
[6] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[7] Univ Bologna, Dipartmento Fis, I-40126 Bologna, Italy
[8] Ist Nazl Fis Nucl, Sez Bologna, I-40126 Bologna, Italy
[9] Univ Cincinnati, Dept Phys, Cincinnati, OH 45221 USA
[10] LIP Coimbra, P-3004516 Coimbra, Portugal
[11] Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[12] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany
[13] Joint Inst Nucl Res, Dubna 141980, Moscow Reg, Russia
[14] DESY, D-22603 Hamburg, Germany
[15] Max Planck Inst Kernphys, D-69117 Heidelberg, Germany
[16] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany
[17] Univ Houston, Dept Phys, Houston, TX 77204 USA
[18] Ukrainian Acad Sci, Inst Nucl Res, UA-03680 Kiev, Ukraine
[19] Jozef Stefan Inst, Ljubljana 1001, Slovenia
[20] Univ Ljubljana, Ljubljana 1001, Slovenia
[21] Univ Calif Los Angeles, Los Angeles, CA 90024 USA
[22] Univ Mannheim, Lehrstuhl Informat 5, D-68131 Mannheim, Germany
[23] Univ Maribor, SLO-2000 Maribor, Slovenia
[24] Inst Theoret & Expt Phys, Moscow 117259, Russia
[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, Inst Nucl Res, Sofia, Bulgaria
[29] Univ Utrecht, NIKHEF H, NL-3584 CB Utrecht, Netherlands
[30] DESY, D-15738 Zeuthen, Germany
[31] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
来源
EUROPEAN PHYSICAL JOURNAL C | 2007年 / 49卷 / 02期
基金
美国国家科学基金会;
关键词
D O I
10.1140/epjc/s10052-006-0139-9
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
Ratios of the psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The psi' and J/psi states were reconstructed in both the mu(+) mu(-) and the e(+) e(-) decay modes. The measurements covered the kinematic range -0.35 <= x(F)<= 0.1 with transverse momentum >= 4.5 GeV/c. The angular dependence of the ratio has been used to measure the difference of the psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R-psi'(mu)/R-psi'(e)=1.00 +/- 0.08 +/- 0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B' (mu)B(e))/(B(mu)B'(e)), of psi' and J/psi in the two channels. The psi' to J/psi production ratio is almost constant in the covered x(F) range and shows a slow increase with p(T).
引用
收藏
页码:545 / 558
页数:14
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