Measurement of the resonance parameters of the charmonium ground state, ηc(11S0)

被引：24

作者：

Ambrogiani, M

Andreotti, A

Argirò, S

Bagnasco, S

Baldini, W

Bettoni, D

Borreani, G

Buzzo, A

Calabrese, R

Cester, R

Cibinetto, G

Dalpiaz, P

Fan, X

Garzoglio, G

Gollwitzer, KE

Graham, M

Hahn, A

Jin, S

Joffe, D

Kasper, J

Lasio, G

Lo Vetere, M

Luppi, E

Maas, P

Macrì, M

Mandelkern, M

Marchetto, F

Marinelli, M

Marsh, W

Martini, M

Menichetti, E

Metreveli, Z

Mussa, R

Negrini, M

Obertino, MM

Pallavicini, M

Pastrone, N

Patrignani, C

Pedlar, TK

Peoples, J

Pordes, S

Robutti, E

Roethel, W

Rosen, J

Rumerio, P

Rusack, R

Santroni, A

Savriè, M

Schultz, J

Seo, SH

机构：

[1] Northwestern Univ, Evanston, IL 60208 USA

[2] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[3] Univ Ferrara, I-44100 Ferrara, Italy

[4] INFN, I-44100 Ferrara, Italy

[5] Ist Nazl Fis Nucl, I-16146 Genoa, Italy

[6] Univ Genoa, I-16146 Genoa, Italy

[7] Univ Calif Irvine, Irvine, CA 92697 USA

[8] Univ Minnesota, Minneapolis, MN 55455 USA

[9] Northwestern Univ, Evanston, IL 60208 USA

[10] Univ Turin, I-10125 Turin, Italy

[11] Ist Nazl Fis Nucl, I-10125 Turin, Italy

来源：

PHYSICS LETTERS B | 2003年 / 566卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(03)00805-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The resonance parameters of the charmonium ground state, eta(c)(1(l)S(0)), have been measured by means of the reaction (p) over barp --> eta(c) --> gammagamma. The mass and total width are determined to be 2984.1 +/- 2.1 +/- 1.0 MeV/c(2) and 20.4(-6.7)(+7.7) +/- 2.0 Mev, respectively. The product of branching ratios B((p) over barp --> eta(c))B(eta(c) --> gammagamma) is determined to be (22.4(-3.7)(+3.8) +/- 2.0) x 10(-8), from which B(eta(c) --> gammagamma) = (1.87(-0.31-0.50)(+0.32+0.95)) x 10(-4), and Gamma(eta(c) --> gammagamma) = 3.8(-1.0-1.0)(+1.1+1-9) keV are derived using B(eta(c) --> (p) over barp) (12 +/- 4) x 10(-4) from the literature. (C) 2003 Published by Elsevier B.V.

引用

页码：45 / 50

页数：6

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