Determination of |Vub|/|Vcb| with DELPHI at LEP

被引:37
作者
Abreu, P
Adam, W
Adye, T
Adzic, P
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
Belous, K
Benekos, M
Benvenuti, AC
Berat, C
Berggren, M
Bertrand, D
Besancon, M
Bigi, M
Bilenky, MS
Bizouard, MA
Bloch, D
机构
[1] FCUl, IST, LIP, PT-1000 Lisbon, Portugal
[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
[3] Univ Instelling Antwerp, Dept Phys, B-2610 Antwerp, Belgium
[4] Free Univ Brussels, IIHE, B-1050 Brussels, Belgium
[5] Univ Etat Mons, Fac Sci, B-7000 Mons, Belgium
[6] Univ Athens, Phys Lab, GR-10680 Athens, Greece
[7] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway
[8] Univ Bologna, Dipartimento Fis, IT-40126 Bologna, Italy
[9] Ist Nazl Fis Nucl, Dipartimento Fis, IT-40126 Bologna, Italy
[10] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil
[11] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil
[12] Univ Estado Rio De Janeiro, Inst Fis, Rio De Janeiro, Brazil
[13] Comenius Univ, Fac Math & Phys, SK-84215 Bratislava, Slovakia
[14] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, FR-75231 Paris 05, France
[15] CERN, CH-1211 Geneva 23, Switzerland
[16] ULP, CNRS, IN2P3, Inst Rech Subatom, FR-67037 Strasbourg, France
[17] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece
[18] CAS, FZU, Inst Phys, Div High Energy Phys, CZ-18040 Prague 8, Czech Republic
[19] Univ Genoa, Dipartimento Fis, IT-16146 Genoa, Italy
[20] Ist Nazl Fis Nucl, IT-16146 Genoa, Italy
[21] Univ Grenoble 1, IN2P3, CNRS, Inst Sci Nucl, FR-38026 Grenoble, France
[22] Helsinki Inst Phys, FI-00014 Helsinki, Finland
[23] Joint Inst Nucl Res Dubna, Head Post Off, RU-101000 Moscow, Russia
[24] Univ Karlsruhe, Inst Expt Kernphys, DE-76128 Karlsruhe, Germany
[25] Inst Nucl Phys, PL-30055 Krakow, Poland
[26] Univ Min & Met Leoben, PL-30055 Krakow, Poland
[27] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, FR-91405 Orsay, France
[28] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England
[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[30] Univ Paris 06, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France
[31] Univ Paris 07, CNRS, IN2P3, LPNHE, FR-75252 Paris 05, France
[32] Lund Univ, 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] Ist Nazl Fis Nucl, IT-20126 Milan, Italy
[38] Niels Bohr Inst, DK-2100 Copenhagen 0, Denmark
[39] Charles Univ Prague, IPNP, MFF, 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 Zografos, 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 Roma Tor Vergata, Dipartimento Fis, IT-00173 Rome, Italy
[49] Ist Nazl Fis Nucl, IT-00173 Rome, Italy
[50] Univ Roma 3, Dipartimento Fis, IT-00146 Rome, Italy
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0370-2693(00)00281-1
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The ratio of the CKM quark-mixing matrix elements \V-ub\/\V-cb\ has been measured using B hadron semileptonic decays. The analysis uses the reconstructed mass M-X of the secondary hadronic system produced in association with an identified lepton. Since B --> X(u)l (v) over bar transitions are characterised by hadronic masses below those of the D mesons produced in B --> X(c)l (v) over bar transitions, events with a reconstructed value of M-X significantly below the D mass are selected. Further signal enrichments are obtained using the topology of reconstructed decays and hadron identification. A fit to the numbers of decays in the b --> u enriched and depleted samples with M-X above and below 1.6 GeV/c(2) and to the shapes of the lepton energy distribution in the B rest frame gives \V-ub\/\V-cb\ = 0.103 (+0.011)(-0.012) (stat.) +/- 0.016(syst.) +/- 0.010(model) and, correspondingly, a charmless semileptonic B decay branching fraction of BR(B --> X(u)l (v) over bar)= (1.57 +/- 0.35 (stat.) +/- 0.48(syst.) +/- 0.27(model)) x 10(-3). (C) 2000 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:14 / 30
页数:17
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