Observation of the decay B0→ρ+ρ- and measurement of the branching fraction and polarization -: art. no. 031102

被引：38

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

Levi, ME

Lynch, G

Mir, LM

Oddone, PJ

Orimoto, TJ

Pripstein, M

Roe, NA

Ronan, MT

Shelkov, VG

Telnov, AV

Wenzel, WA

Ford, K

机构：

[1] Lab Annecy Le Vieux Phys Particules, 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, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

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

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

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

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

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

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

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

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

[15] Univ Calif Riverside, Riverside, CA 92521 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, LLR, F-91128 Palaiseau, France

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

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

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

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

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

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

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

[32] Harvard Univ, Cambridge, MA 02138 USA

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

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

[35] Univ Iowa, Iowa City, IA 52242 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, Queen Mary, London E1 4NS, England

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

[41] Univ Louisville, Louisville, KY 40292 USA

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

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

[44] Univ Massachusetts, Amherst, MA 01003 USA

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

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

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

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

[49] Univ Mississippi, University, MS 38677 USA

[50] Univ Montreal, Lab Rene JA Levesque, Montreal, PQ H3C 3J7, Canada

来源：

PHYSICAL REVIEW D | 2004年 / 69卷 / 03期

关键词：

D O I：

10.1103/PhysRevD.69.031102

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed the rare decay B-0-->rho(+)rho(-) in a sample of 89 million B (b) over bar pairs recorded with the BABAR detector. The number of observed events is 88(-21)(+23)+/-9, with a significance of 5.1 standard deviations with systematic uncertainties included. The branching fraction and the longitudinal polarization are measured to be B(B-0-->rho(+)rho(-))=(25(-6-6)(+7+5))x10(-6) and Gamma(L)/Gamma=0.98(-0.08)(+0.02)+/-0.03, respectively.

引用

页数：8

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