Evidence for the rare decay B+ → Ds+ π0

被引：8

作者：

Aubert, B.

Bona, M.

Boutigny, D.

Karyotakis, Y.

Lees, J. P.

Poireau, V.

Prudent, X.

Tisserand, V.

Zghiche, A.

Grauges, E.

Palano, A.

Chen, J. C.

Qi, N. D.

Rong, G.

Wang, P.

Zhu, Y. S.

Eigen, G.

Ofte, I.

Stugu, B.

Abrams, G. S.

Battaglia, M.

Brown, D. N.

Button-Shafer, J.

Cahn, R. N.

Groysman, Y.

Jacobsen, R. G.

Kadyk, J. A.

Kerth, L. T.

Kolomensky, Yu. G.

Kukartsev, G.

Lopes Pegna, D.

Lynch, G.

Mir, L. M.

Orimoto, T. J.

Pripstein, M.

Roe, N. A.

Ronan, M. T.

Tackmann, K.

Wenzel, W. A.

del Amo Sanchez, P.

Barrett, M.

Harrison, T. J.

Hart, A. J.

Hawkes, C. M.

Watson, A. T.

Held, T.

Koch, H.

Lewandowski, B.

Pelizaeus, M.

Peters, K.

机构：

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

[2] Univ Savoie, F-74941 Annecy Le Vieux, France

[3] Univ Barcelona, Fac Fis, Dept ECM, E-08028 Barcelona, Spain

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[22] CALTECH, Pasadena, CA 91125 USA

[23] Univ Cincinnati, Cincinnati, OH 45221 USA

[24] Univ Colorado, Boulder, CO 80309 USA

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

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

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

[28] Ecole Polytech, Lab Leprince Ringuet, CNRS, F-91128 Palaiseau, France

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

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

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

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

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

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

[35] Harvard Univ, Cambridge, MA 02138 USA

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

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

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

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

[40] Johns Hopkins Univ, Baltimore, MD 21218 USA

[41] Univ Karlsruhe, Inst Expt Kernphys, D-76021 Karlsruhe, Germany

[42] CNRS, Lab Accelerateur Lineaire, F-91898 Orsay, France

[43] Univ Paris 11, Ctr Sci Orsay, F-91898 Orsay, France

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

[45] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England

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

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

[48] Univ Louisville, Louisville, KY 40292 USA

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

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

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 17期

基金：

英国科学技术设施理事会;

关键词：

D O I：

10.1103/PhysRevLett.98.171801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have searched for the rare decay B+ -> D-s(+) pi(0). The analysis is based on a sample of 232 X 10(6) Y(4S) -> B (B) over bar decays collected with the BABAR detector at the SLAC PEP-II e(+)e(-) storage ring. We find 19.6 signal events, corresponding to a significance of 4.7 sigma. The extracted signal yield including statistical and systematic uncertainties is 20.1(-6.0-1.5)(+6.8+0.4) and we measure B(B+ -> D-s(+) pi(0)) = (1.5(-0.4)(+0.5) +/- 0.1 +/- 0.2) X x 10(-5), where the first uncertainty is statistical, the second is systematic, and the last is due to the uncertainty on the D-s(+) decay and its daughter decay branching fractions.

引用

页数：7

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