Limit on the B0→ρ0ρ0 branching fraction and implications for the Cabibbo-Kobayashi-Maskawa angle α -: art. no. 131801

被引：23

作者：

Aubert, B ^{[1
]}

Barate, R

Boutigny, D

Couderc, F

Karyotakis, Y

Lees, JP

Poireau, V

Tisserand, V

Zghiche, A

Grauges-Pous, E

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

Lynch, G

Mir, LM

Oddone, PJ

Orimoto, TJ

Pripstein, M

Roe, NA

Ronan, MT

Wenzel, WA

Barrett, M

Ford, KE

Harrison, TJ

Hart, AJ

Hawkes, CM

机构：

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

[2] Univ Autonoma Barcelona, IFAE, E-08193 Barcelona, Spain

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

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

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

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

[7] Lawrence Berkeley Lab, Berkeley, CA 94720 USA

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

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

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

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

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

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

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

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

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

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

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

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

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

[21] CALTECH, Pasadena, CA 91125 USA

[22] Univ Cincinnati, Cincinnati, OH 45221 USA

[23] Univ Colorado, Boulder, CO 80309 USA

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

[25] Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany

[26] Tech Univ Dresden, Inst Kernund Teilchenphys, D-01062 Dresden, Germany

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

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

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

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

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

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

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

[34] Harvard Univ, Cambridge, MA 02138 USA

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

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

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

[38] Iowa State Univ Sci & Technol, Ames, IA 50011 USA

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

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

[41] Univ Liverpool, Liverpool L69 72E, Merseyside, England

[42] Queen Mary Univ London, London E1 4NS, England

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

[44] Univ Louisville, Louisville, KY 40292 USA

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

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

[47] Univ Massachusetts, Amherst, MA 01003 USA

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.94.131801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We search for the decay B-0 ->rho(0)rho(0) in a data sample of about 227x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We find no significant signal and set an upper limit of 1.1x10(-6) at 90% C.L. on the branching fraction. As a result, the uncertainty due to penguin contributions on the Cabibbo-Kobayashi-Maskawa unitarity angle alpha measured in B ->rho rho decays is decreased to 11 degrees at 68% C.L.

引用

页数：7

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