Extraction of form Factors from a Four-Dimensional Angular Analysis of (B)over-bar → D*l-(ν)over-barl

被引：35

作者：

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

Poireau, V ^{[1
]}

Tisserand, V ^{[1
]}

Grauges, E. ^{[2
]}

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

Eigen, G. ^{[5
]}

Brown, D. N. ^{[6
,7
,36
]}

Kolomensky, Yu G. ^{[6
,7
]}

Fritsch, M. ^{[8
]}

Koch, H. ^{[8
]}

Schroeder, T. ^{[8
]}

Hearty, C. ^{[9
,10
]}

Mattison, T. S. ^{[10
]}

McKenna, J. A. ^{[10
]}

So, R. Y. ^{[10
]}

Blinov, V. E. ^{[11
,12
,13
]}

Buzykaev, A. R. ^{[11
]}

Druzhinin, V. P. ^{[11
,12
]}

Golubev, V. B. ^{[11
,12
]}

Kozyrev, E. A. ^{[11
,12
]}

Kravchenko, E. A. ^{[11
,12
]}

Onuchin, A. P. ^{[11
,12
,13
]}

Serednyakov, S., I ^{[11
,12
]}

Skovpen, Yu, I ^{[11
,12
]}

Solodov, E. P. ^{[11
,12
]}

Todyshev, K. Yu ^{[11
,12
]}

Lankford, A. J. ^{[14
]}

Dey, B. ^{[15
]}

Gary, J. W. ^{[15
]}

Long, O. ^{[15
]}

Eisner, A. M. ^{[16
]}

Lockman, W. S. ^{[16
]}

Vazquez, W. Panduro ^{[16
]}

Chao, D. S. ^{[17
]}

Cheng, C. H. ^{[17
]}

Echenard, B. ^{[17
]}

Flood, K. T. ^{[17
]}

Hitlin, D. G. ^{[17
]}

Kim, J. ^{[17
]}

Li, Y. ^{[17
]}

Miyashita, T. S. ^{[17
]}

Ongmongkolkul, P. ^{[17
]}

Porter, F. C. ^{[17
]}

Rohrken, M. ^{[17
]}

Huard, Z. ^{[18
]}

Meadows, B. T. ^{[18
]}

Pushpawela, B. G. ^{[18
]}

Sokoloff, M. D. ^{[18
]}

Sun, L. ^{[18
,85
]}

Smith, J. G. ^{[19
]}

机构：

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

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

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

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

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

[9] Inst Particle Phys, Vancouver, BC V6T 1Z1, Canada

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

[11] Budker Inst Nucl Phys SB RAS, Novosibirsk 630090, Russia

[12] Novosibirsk State Univ, Novosibirsk 630090, Russia

[13] Novosibirsk State Tech Univ, Novosibirsk 630092, Russia

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

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

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

[17] CALTECH, Pasadena, CA 91125 USA

[18] Univ Cincinnati, Cincinnati, OH 45221 USA

[19] Univ Colorado, Boulder, CO 80309 USA

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

[21] Ist Nazl Fis Nucl, Sez Ferrara, I-44122 Ferrara, Italy

[22] Univ Ferrara, Dipartimento Fis & Sci Terra, I-44122 Ferrara, Italy

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

[24] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy

[25] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

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

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

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

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

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

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

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

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

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

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

[36] Univ Louisville, Louisville, KY 40292 USA

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

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

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

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

[41] Inst Particle Phys, Montreal, PQ H3A 2T8, Canada

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

[43] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

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

[45] Univ Mississippi, University, MS 38677 USA

[46] Univ Montreal, Phys Particules, Montreal, PQ H3C 3J7, Canada

[47] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy

[48] Univ Napoli Federico II, Dipartimento Sci Fis, I-80126 Naples, Italy

[49] Natl Inst Nucl Phys & High Energy Phys, NIKHEF, NL-1009 DB Amsterdam, Netherlands

[50] Univ Notre Dame, Notre Dame, IN 46556 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 09期

基金：

加拿大自然科学与工程研究理事会;

关键词：

CB-VERTICAL-BAR; DISPERSIVE BOUNDS; BABAR DETECTOR;

D O I：

10.1103/PhysRevLett.123.091801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An angular analysis of the decay (B) over bar -> D*l(-)(nu) over bar (l), l is an element of {e, mu}, is reported using the full e(+) e(-) collision data set collected by the BABAR experiment at the Upsilon(4S) resonance. One B meson from the Upsilon(4S) -> B (B) over bar decay is fully reconstructed in a hadronic decay mode, which constrains the kinematics and provides a determination of the neutrino momentum vector. The kinematics of the semileptonic decay is described by the dilepton mass squared, q(2), and three angles. The first unbinned fit to the full four-dimensional decay rate in the standard model is performed in the so-called Boyd-Grinstein-Lebed approach, which employs a generic q(2) parametrization of the underlying form factors based on crossing symmetry, analyticity, and QCD dispersion relations for the amplitudes. A fit using the more model-dependent Caprini-Lellouch-Neubert (CLN) approach is performed as well. Our form factor shapes show deviations from previous fits based on the CLN parametrization. The latest form factors also provide an updated prediction for the branching fraction ratio R(D*) B((B) over bar -> D* tau(-)(nu) over bar (tau)) /B((B) over bar -> D*l(-)(nu) over bar (l)) = 0.253 +/- 0.005. Finally, using the well-measured branching fraction for the (B) over bar -> D*l(-)(nu) over bar (l) decay, a value of vertical bar V-cb vertical bar = (38.36 +/- 0.90) x 10(-3) is obtained that is consistent with the current world average for exclusive (B) over bar -> D(*)l(-)(nu) over bar (l) decays and remains in tension with the determination from inclusive semileptonic B decays to final states with charm.

引用

页数：8

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