Measurements of the mass and width of the ηc meson and of an ηc(2S) candidate -: art. no. 142002

被引：60

作者：

Aubert, B ^{[1
]}

Barate, R

Boutigny, D

Gaillard, JM

Hicheur, A

Karyotakis, Y

Lees, JP

Robbe, R

Tisserand, V

Zghiche, A

Palano, A

Pompili, A

Chen, JC

Qi, ND

Rong, G

Wang, P

Zhu, YS

Eigen, G

Ofte, I

Stugu, B

Abrams, GS

Borgland, AW

Breon, AB

Brown, DN

Button-Shafer, J

Cahn, RN

Charles, E

Day, CT

Gill, MS

Gritsan, AV

Groysman, Y

Jacobsen, RG

Kadel, RW

Kadyk, J

Kerth, LT

Kolomensky, YG

Kral, JF

Kukartsev, G

LeClerc, C

Levi, ME

Lynch, G

Mir, LM

Oddone, PJ

Orimoto, TJ

Pripstein, M

Roe, NA

Romosan, A

Ronan, MT

Shelkov, VG

Telnov, AV

机构：

[1] Phys Particules Lab, F-74941 Annecy Le Vieux, France

[2] Univ Bari, Dipartimento Fis, I-70126 Bari, Italy

[3] Univ Bari, Ist Nazl Fis Nucl, I-70126 Bari, Italy

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

[5] Univ Bergen, Inst Phys, N-5007 Bergen, Norway

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

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

[8] Univ Birmingham, Birmingham B15 2TT, W Midlands, England

[9] Ruhr Univ Bochum, Inst Expt Phys 1, D-44780 Bochum, Germany

[10] Univ Bristol, Bristol BS8 1TL, Avon, England

[11] Univ British Columbia, Vancouver, BC V6T 1Z1, Canada

[12] Brunel Univ, Uxbridge UB8 3PH, Middx, England

[13] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

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

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

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

[17] Univ Calif San Diego, La Jolla, CA 92093 USA

[18] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA

[19] Univ Calif Santa Cruz, Inst Particle Phys, Santa Cruz, CA 95064 USA

[20] CALTECH, Pasadena, CA 91125 USA

[21] Univ Cincinnati, Cincinnati, OH 45221 USA

[22] Univ Colorado, Boulder, CO 80309 USA

[23] Colorado State Univ, Ft Collins, CO 80523 USA

[24] Tech Univ Dresden, Inst Kern & Teilchenphys, D-01062 Dresden, Germany

[25] Ecole Polytech, LLR, F-91128 Palaiseau, France

[26] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland

[27] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

[28] Univ Ferrara, Ist Nazl Fis Nucl, I-44100 Ferrara, Italy

[29] Florida A&M Univ, Tallahassee, FL 32307 USA

[30] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[31] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy

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

[33] Harvard Univ, Cambridge, MA 02138 USA

[34] Univ London Imperial Coll Sci Technol & Med, London SW7 2BW, England

[35] Univ Iowa, Iowa City, IA 52242 USA

[36] Iowa State Univ, Ames, IA 50011 USA

[37] Lab Accelerateur Lineaire, F-91898 Orsay, France

[38] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[39] Univ Liverpool, Liverpool L69 3BX, Merseyside, England

[40] Univ London Queen Mary & Westfield Coll, London E1 4NS, England

[41] Univ London Royal Holloway & Bedford New Coll, Egham TW20 0EX, Surrey, England

[42] Univ Louisville, Louisville, KY 40292 USA

[43] Univ Manchester, Manchester M13 9PL, Lancs, England

[44] Univ Maryland, College Pk, MD 20742 USA

[45] Univ Massachusetts, Amherst, MA 01003 USA

[46] MIT, Nucl Sci Lab, Cambridge, MA 02139 USA

[47] McGill Univ, Montreal, PQ H3A 2T8, Canada

[48] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[49] Univ Milan, Ist Nazl Fis Nucl, I-20133 Milan, Italy

[50] Univ Mississippi, University, MS 38677 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 14期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.92.142002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The mass m(etac) and total width Gamma(tot)(etac) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c) --> (KSK+/-)-K-0 pi(-/+) decays in 88 fb(-1) of data, the results are m(etac) = 2982.5 +/- 1.1 (stat) +/- 0.9(syst) MeV/c(2) and Gamma(tot)(etac) = 34.3 +/- 2.3(stat) +/- 0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112 +/- 24 events is observed with a mass of 3630.8 +/- 3.4(stat) +/- 1.0(syst) MeV/c(2) and width of 17.0 +/- 8.3(stat) +/- 2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.

引用

页码：142002 / 1

页数：7

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