Measurement of the direct CP asymmetry in b→sγ decays -: art. no. 021804

被引：35

作者：

Aubert, B ^{[1
]}

Barate, R

Boutigny, D

Couderc, F

Gaillard, JM

Hicheur, A

Karyotakis, Y

Lees, JP

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

Kukartsev, G

LeClerc, C

Lynch, G

Merchant, AM

Mir, LM

Oddone, PJ

Orimoto, TJ

Pripstein, M

Roe, NA

Ronan, MT

Shelkov, VG

Wenzel, WA

Ford, K

Harrison, TJ

机构：

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

[2] Univ Bari, Dipartmento 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] 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, Dipartmento Fis, I-44100 Ferrara, Italy

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

[33] Harvard Univ, Cambridge, MA 02138 USA

[34] Heidelberg Univ, Inst Phys, D-69120 Heidelberg, Germany

[35] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England

[36] Iowa State Univ, Iowa City, IA 52242 USA

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

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

[39] Univ Liverpool, Liverpool L69 72E, Merseyside, 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] Ist Nazl Fis Nucl, I-20133 Milan, Italy

[50] Univ Mississippi, University, MS 38677 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 02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.93.021804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We describe a measurement of the direct CP asymmetry between inclusive b-->sgamma and (b) over bar -->(s) over bar gamma decays. This asymmetry is expected to be less than 0.01 in the standard model, but could be enhanced up to about 0.10 by new physics contributions. We use a sample of 89x10(6) B (B) over bar pairs recorded with the BABAR detector at SLAC PEP-II, from which we reconstruct a set of 12 exclusive b-->sgamma final states containing one charged or neutral kaon and one to three pions. We measure an asymmetry of A(CP)(b-->sgamma)=0.025+/-0.050(stat)+/-0.015(syst), corresponding to an allowed range of -0.06<A(CP)(b-->sgamma)<+0.11 at 90% confidence level.

引用

页码：021804 / 1

页数：7

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