Study of (B)over-bar → Xul(v)over-bar decays in B(B)over-bar events tagged by a fully reconstructed B-meson decay and determination of |Vub|

被引：26

作者：

Lees, J. P. ^{[1
]}

Poireau, V. ^{[1
]}

Tisserand, V. ^{[1
]}

Tico, J. Garra ^{[2
]}

Grauges, E. ^{[2
]}

Martinelli, M. ^{[3
,4
]}

Milanes, D. A. ^{[3
]}

Palano, A. ^{[3
,4
]}

Pappagallo, M. ^{[3
,4
]}

Eigen, G. ^{[5
]}

Stugu, B. ^{[5
]}

Brown, D. N. ^{[6
,43
]}

Kerth, L. T. ^{[6
]}

Kolomensky, Yu G. ^{[6
]}

Lynch, G. ^{[6
]}

Tackmann, K. ^{[6
]}

Koch, H. ^{[7
]}

Schroeder, T. ^{[7
]}

Asgeirsson, D. J. ^{[8
]}

Hearty, C. ^{[8
]}

Mattison, T. S. ^{[8
]}

McKenna, J. A. ^{[8
]}

Khan, A. ^{[9
]}

Blinov, V. E. ^{[10
]}

Buzykaev, A. R. ^{[10
]}

Druzhinin, V. P. ^{[10
]}

Golubev, V. B. ^{[10
]}

Kravchenko, E. A. ^{[10
]}

Onuchin, A. P. ^{[10
]}

Serednyakov, S. I. ^{[10
]}

Skovpen, Yu I. ^{[10
]}

Solodov, E. P. ^{[10
]}

Todyshev, K. Yu ^{[10
]}

Yushkov, A. N. ^{[10
]}

Bondioli, M. ^{[11
]}

Kirkby, D. ^{[11
]}

Lankford, A. J. ^{[11
]}

Mandelkern, M. ^{[11
]}

Stoker, D. P. ^{[11
]}

Atmacan, H. ^{[12
]}

Gary, J. W. ^{[12
]}

Liu, F. ^{[12
]}

Long, O. ^{[12
]}

Vitug, G. M. ^{[12
]}

Campagnari, C. ^{[13
]}

Hong, T. M. ^{[13
]}

Kovalskyi, D. ^{[13
]}

Richman, J. D. ^{[13
]}

West, C. A. ^{[13
]}

Eisner, A. M. ^{[14
]}

机构：

[1] Univ Savoie, LAPP, CNRS, IN2P3, F-74941 Annecy Le Vieux, France

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

[3] INFN Sez Bari, I-70126 Bari, Italy

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

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

[6] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

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

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

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

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

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

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

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

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

[15] CALTECH, Pasadena, CA 91125 USA

[16] Univ Cincinnati, Cincinnati, OH 45221 USA

[17] Univ Colorado, Boulder, CO 80309 USA

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

[19] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

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

[21] Ecole Polytech, Lab Leprince Ringuet, CNRS, IN2P3, F-91128 Palaiseau, France

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

[23] INFN Sez Ferrara, I-44100 Ferrara, Italy

[24] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy

[25] INFN Lab Nazl Frascati, I-00044 Frascati, Italy

[26] INFN Sez Genova, I-16146 Genoa, Italy

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

[28] Indian Inst Technol Guwahati, Gauhati 781039, Assam, India

[29] Harvard Univ, Cambridge, MA 02138 USA

[30] Harvey Mudd Coll, Claremont, CA 91711 USA

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

[32] Univ Berlin, Inst Phys, D-12489 Berlin, Germany

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

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

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

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

[37] CNRS, IN2P3, Lab Accelerateur Lineaire, F-91898 Orsay, France

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

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

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

[41] Univ London, London E1 4NS, England

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

[43] Univ Louisville, Louisville, KY 40292 USA

[44] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[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] INFN Sez Milano, I-20133 Milan, Italy

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 03期

基金：

美国国家科学基金会; 英国科学技术设施理事会; 加拿大自然科学与工程研究理事会;

关键词：

INCLUSIVE SEMILEPTONIC-B; EFFECTIVE FIELD-THEORY; ENERGY MOMENTS; CP-VIOLATION; END-POINT; HEAVY; ANNIHILATION; PARTICLE; FACTORIZATION; SPECTRUM;

D O I：

10.1103/PhysRevD.86.032004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report measurements of partial branching fractions for inclusive charmless semileptonic B decays (B) over bar -> X(u)l (v) over bar and the determination of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element vertical bar V-ub vertical bar. The analysis is based on a sample of 467 x 10(6) Y(4S) -> B (B) over bar decays recorded with the BABAR detector at the PEP- II e(+)e(-) storage rings. We select events in which the decay of one of the B mesons is fully reconstructed and an electron or a muon signals the semileptonic decay of the other B meson. We measure partial branching fractions Delta B in several restricted regions of phase space and determine the CKM element vertical bar V-ub vertical bar based on different QCD predictions. For decays with a charged lepton momentum p(l)* > 1.0 GeV in the B meson rest frame, we obtain Delta B = (1.80 +/- 0.13(stat) +/- 0.15(sys) +/- 0.02(theo)) x 10(-3) from a fit to the two-dimensional M-X - q(2) distribution. Here, M-X refers to the invariant mass of the final state hadron X and q(2) is the invariant mass squared of the charged lepton and neutrino. From this measurement we extract vertical bar V-ub vertical bar = (4.33 +/- 0.24(exp) +/- 0.15(theo)) x 10(-3) as the arithmetic average of four results obtained from four different QCD predictions of the partial rate. We separately determine partial branching fractions for (B) over bar (0) and B- decays and derive a limit on the isospin breaking in (B) over bar -> X(u)l (v) over bar decays.

引用

页数：23

共 50 条

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