Production of charmonium states in pi Be-- collisions at 515 GeV/c

被引：0

作者：

Koreshev, V

Jesik, R

Mendez, H

Abramov, V

Antipov, Y

Baldin, B

Crittenden, R

Davis, C

Dauwe, L

Denisov, S

Dyshkant, A

Dzierba, A

Glebov, V

Goldberg, H

Gribushin, A

Krider, J

Krinitsyn, A

Li, R

Margulies, S

Marshall, T

Martin, J

Petrukhin, A

Solomon, J

Sirotenko, V

Smith, P

Sulanke, T

Sulyaev, R

Vaca, F

Zieminski, A

Apanasevich, L

Bacigalupi, J

Begel, M

Blusk, S

Bromberg, C

Chang, P

Choudhary, B

Chung, WH

deBarbaro, L

Dlugosz, W

Dunlea, J

Engels, E

Fanourakis, G

Ginther, G

Hartman, K

Huston, J

Kapoor, V

Lirakis, C

Mani, S

Mansour, J

Maul, A

机构：

[1] INST HIGH ENERGY PHYS,SERPUKHOV,RUSSIA

[2] UNIV ILLINOIS,CHICAGO,IL 60607

[3] INDIANA UNIV,BLOOMINGTON,IN 47405

[4] UNIV LOUISVILLE,LOUISVILLE,KY 40292

[5] UNIV MICHIGAN,FLINT,MI 48502

[6] UNIV CALIF DAVIS,DAVIS,CA 95616

[7] UNIV DELHI,DELHI 110007,INDIA

[8] MICHIGAN STATE UNIV,E LANSING,MI 48824

[9] NORTHEASTERN UNIV,BOSTON,MA 02115

[10] PENN STATE UNIV,UNIVERSITY PK,PA 16802

[11] UNIV PITTSBURGH,PITTSBURGH,PA 15260

[12] UNIV ROCHESTER,ROCHESTER,NY 14627

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.77.4294

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on chi(c1) and chi(c2) production in the Feynman:x range 0.1 < x(F) < 0.8 in 515 GeV/c pi(-)Be collisions. The chi(c) states are observed via their radiative decays into J/psi's. The resulting photons are detected tither as showers in the electromagnetic calorimeter or after conversion in the target as e(+)e(-) pairs in the tracking system. The fraction of J/psi production due to chi(c1) and chi(c2) decays is 0.443 +/- 0.041 +/- 0.035. The ratio of the chi(c1) to chi(c2) cross section is 0.57 +/- 0.18 +/- 0.06. Our results on J/psi, psi(2S), and chi(c) production indicate that 0.454 +/- 0.034 +/- 0.042 of J/psi's are produced directly.

引用

页码：4294 / 4297

页数：4

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