Measurement of the (B)over-bar → D(*)πl(ν)over-barl branching fraction

被引：17

作者：

Abreu, P

Adam, W

Adye, T

Adzic, P

Ajinenko, I

Albrecht, Z

Alderweireld, T

Alekseev, GD

Alemany, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amapane, N

Amato, S

Anassontzis, EG

Andersson, P

Andreazza, A

Andringa, S

Antilogus, P

Apel, WD

Arnoud, Y

Åsman, B

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbiellini, G

Barbier, R

Bardin, DY

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Behrmann, A

Beilliere, P

Belokopytov, Y

Benekos, NC

Benvenuti, AC

Berat, C

Berggren, M

Bertini, D

Bertrand, D

Besancon, M

Bigi, M

Bilenky, MS

Bizouard, MA

机构：

[1] DESY Zeuthen, D-15735 Zeuthen, Germany

[2] Univ Instelling Antwerp, Dept Phys, B-2610 Wilrijk, Belgium

[3] Free Univ Brussels, ULB, IIHE, B-1050 Brussels, Belgium

[4] Univ Mons, Fac Sci, B-7000 Mons, Belgium

[5] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[6] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway

[7] Univ Bologna, Dipartimento Fis, IT-40126 Bologna, Italy

[8] Ist Nazl Fis Nucl, IT-40126 Bologna, Italy

[9] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[10] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[11] Univ Estadual Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil

[12] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia

[13] Coll France, Phys Corpusculaire Lab, CNRS, IN2P3, FR-75231 Paris 05, France

[14] CERN, CH-1211 Geneva 23, Switzerland

[15] ULP, CNRS, Inst Rech Subatom, IN2P3, FR-67037 Strasbourg, France

[16] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[17] Acad Sci Czech Republ, Inst Phys, FZU, CZ-18040 Prague 8, Czech Republic

[18] Univ Genoa, Dipartimento Fis, IT-16146 Genoa, Italy

[19] Ist Nazl Fis Nucl, IT-16146 Genoa, Italy

[20] Univ Grenoble 1, IN2P3 CNRS, Inst Sci Nucl, FR-38026 Grenoble, France

[21] Helsinki Inst Phys, FI-00014 Helsinki, Finland

[22] Joint Inst Nucl Res Dubna, RU-101000 Moscow, Russia

[23] Univ Karlsruhe, Inst Expt Kernphys, DE-76128 Karlsruhe, Germany

[24] Inst Nucl Phys, PL-30055 Krakow, Poland

[25] Stanislaw Staszic Univ Min & Met, PL-30055 Krakow, Poland

[26] Univ Paris 11, Lab Accelerateur Lineaire, CNRS, IN2P3, FR-91405 Orsay, France

[27] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[28] FCUL, IST, LIP, PT-1000 Lisbon, Portugal

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[30] Univ Paris 06, IN2P3 CNRS, LPNHE, FR-75252 Paris 05, France

[31] Univ Paris 07, IN2P3 CNRS, LPNHE, FR-75252 Paris 05, France

[32] Univ Lund, Dept Phys, SE-22363 Lund, Sweden

[33] Univ Lyon 1, IPNL, IN2P3 CNRS, FR-69622 Villeurbanne, France

[34] Univ Aix Marseille 2, CPP, IN2P3 CNRS, FR-13288 Marseille 09, France

[35] Univ Milan, Dipartimento Fis, IT-20133 Milan, Italy

[36] Ist Nazl Fis Nucl, IT-20133 Milan, Italy

[37] Univ Studi Milano Bicocca, IT-20126 Milan, Italy

[38] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark

[39] Charles Univ, MFF, IPNP, Areal MFF, CZ-18000 Prague 8, Czech Republic

[40] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[41] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[42] Univ Oslo, Dept Phys, NO-1000 Oslo 3, Norway

[43] Univ Oviedo, Dpto Fis, ES-33007 Oviedo, Spain

[44] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[45] Univ Padua, Dipartimento Fis, IT-35131 Padua, Italy

[46] Ist Nazl Fis Nucl, IT-35131 Padua, Italy

[47] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[48] Univ Rome 2, Dipartimento Fis, IT-00173 Rome, Italy

[49] Ist Nazl Fis Nucl, IT-00173 Rome, Italy

[50] Univ Rome III, Dipartimento Fis, IT-00146 Rome, Italy

来源：

PHYSICS LETTERS B | 2000年 / 475卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(00)00040-X

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A study of b semileptonic decays into D, D pi(+/-) and D*pi(+/-) final states is presented. The D-0, D+ and D*(+) mesons are exclusively reconstructed in Z decay data recorded from 1992 to 1995 in the DELPHI experiment at LEP. The overall branching fractions are measured to be: BR(b --> D(0)l(-)<(upsilon)over bar>X-l) = (7.04 +/- 0.34(stat) +/- 0.36 (syst.exp) +/- 0.17(BRD))%, BR(b --> D(+)l(-)<(upsilon)over bar>X-l) = (2.72 +/- 0.19(stat) +/- 0.16(syst.exp) +/- 0.18(BRD))%, BR(b --> D*(+)l(-)<(upsilon)over bar>X-l) = (2.75 +/- 0.17(stat) +/- 0.13 (syst.exp) +/- 0.09 (BRD))%, where the D-0 and D+ results include also contributions from D*(0) and D*(+) decays. A fit to the distribution of the pi(+/-) impact parameter to the primary interaction vertex provides a measurement of the b semileptonic branching fractions into the D(0)pi(+/-)X, D(+)pi(+/-)X and D*(+)pi(+/-)X final states. Assuming that single pion decay modes of B mesons dominate, the partial rates for (B) over bar --> D pi l(-)<(upsilon)over bar>(l) and (B) over bar --> D*pi l(-)<(upsilon)over bar>(l) have been obtained, corresponding to a total branching fraction: BR((B) over bar --> D pi l(-)<(upsilon)over bar>(l)) + BR((B) over bar --> D*pi l(-)<(upsilon)over bar>(l)) = (3.40 +/- 0.52 (stat) +/- 0.32 (syst))%. This result agrees well with the observed difference between the total B semileptonic branching fraction and the sum of the (B) over bar --> Dl(-) upsilon(l) and D* l(-)<(upsilon)over bar>(l) branching fractions. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：407 / 428

页数：22

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