Measurement of CP-violating asymmetries in B0 decays to CP eigenstates

被引：140

作者：

Aubert, B

Boutigny, D

De Bonis, I

Gaillard, JM

Jeremie, K

Karyotakis, Y

Lees, JP

Robbe, P

Tisserand, V

Palano, A

Chen, GP

Chen, JC

Qi, ND

Rong, G

Wang, P

Zhu, YS

Eigen, G

Reinertsen, PL

Stugu, B

Abbott, B

Abrams, GS

Borgland, AW

Breon, AB

Brown, DN

Button-Shafer, J

Cahn, RN

Clark, AR

Dardin, S

Day, C

Dow, SF

Elioff, T

Fan, Q

Gaponenko, I

Gill, MS

Goozen, FR

Gowdy, SJ

Gritsan, A

Groysman, Y

Jacobsen, RG

Jared, RC

Kadel, RW

Kadyk, J

Karcher, A

Kerth, LT

Kipnis, I

Kluth, S

Kolomensky, YG

Kral, JE

Lafever, R

LeClerc, C

机构：

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

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

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

[7] Lawrence Berkeley Lab, 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 San Diego, La Jolla, CA 92093 USA

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

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

[19] CALTECH, Pasadena, CA 91125 USA

[20] Univ Cincinnati, Cincinnati, OH 45221 USA

[21] Univ Colorado, Boulder, CO 80309 USA

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

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

[24] Ecole Polytech, F-91128 Palaiseau, France

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

[26] Elon Univ, Elon, NC 27244 USA

[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 Iowa, Iowa City, IA 52242 USA

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

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

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

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

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

[40] Univ London, 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 | 2001年 / 86卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.86.2515

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23 X 10(6) Y (4S) --> B (B) over bar decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAG. Zn this sample, we find events in which one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the standard model is proportional to sin2 beta, is derived from the decay time distributions in such events. The result is sin2 beta = 0.34 +/- 0.20 (stat) +/- 0.05 (syst).

引用

页码：2515 / 2522

页数：8

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