Measurement of the semileptonic b branching fractions and average b mixing parameter in Z decays

被引:13
作者
Abreu, P
Adam, W
Adyc, 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
Ballestrero, A
Bambade, P
Barao, F
Barbiellini, G
Barbier, R
Bardin, DY
Barker, G
Baroncelli, A
Battaglia, M
Baubillier, M
Becks, KH
Begalli, T
Behrmann, A
Beilliere, P
Belokopytov, Y
Benekos, NC
Benvenuti, AC
Berat, C
Berggren, M
Berntzon, L
Bertrand, D
Besancon, M
Bilenky, MS
Bizouard, MA
机构
[1] LIP, IST, FCUL, P-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] IIHE, ULB VUB, 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, N-5007 Bergen, Norway
[8] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy
[9] Ist Nazl Fis Nucl, I-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, Bratislava 84215, Slovakia
[14] Coll France, Phys Corpusculaire Lab, IN2PE CNRS, F-75231 Paris 05, France
[15] CERN, CH-1211 Geneva 23, Switzerland
[16] Inst Rech Subatom, IN2P3, CNRS ULP, F-67037 Strasbourg, France
[17] Inst Phys Nucl, NCSR Demokritos, Athens, Greece
[18] FZU, Inst Phys, CAS High Energy Phys Div, Prague 18040 8, Czech Republic
[19] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy
[20] Ist Nazl Fis Nucl, I-16146 Genoa, Italy
[21] Univ Grenoble 1, Inst Sci Nucl, IN2P3 CNRS, F-38026 Grenoble, France
[22] Helsinki Inst Phys, Helsinki 00014, Finland
[23] Joint Inst Nucl Res Dubna, Head PO, Moscow 101000, Russia
[24] Univ Karlsruhe, Inst Expt Kernphys, D-76128 Karlsruhe, Germany
[25] Inst Nucl Phys, PL-30055 Krakow, Poland
[26] Univ Min & Met Krakow, PL-30055 Krakow, Poland
[27] Univ Paris 11, Lab Accelerateur Lineaire, IN2P3 CNRS, F-91405 Orsay, France
[28] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
[29] Univ Paris 06, LPNHE, IN2P3 CNRS, F-75252 Paris 05, France
[30] Univ Paris 07, F-75252 Paris 05, France
[31] Lund Univ, Dept Phys, S-22363 Lund, Sweden
[32] Univ Lyon 1, IPNL, IN2P3 CNRS, F-69622 Villeurbanne, France
[33] Univ Aix Marseille 2, CPP, IN2P3 CNRS, F-13288 Marseille 09, France
[34] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[35] Ist Nazl Fis Nucl, I-20133 Milan, Italy
[36] Univ Milan, Dipartimento Fis, I-20126 Milan, Italy
[37] Ist Nazl Fis Nucl, I-20126 Milan, Italy
[38] Niels Bohr Inst, DK-2100 Copenhagen O, Denmark
[39] Charles Univ Prague, IPNP, MFF, CR-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, N-1000 Oslo 3, Norway
[43] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain
[44] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[45] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy
[46] Ist Nazl Fis Nucl, I-35131 Padua, Italy
[47] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[48] Univ Roma Tor Vergata, Dipartimento Fis, I-00173 Rome, Italy
[49] Ist Nazl Fis Nucl, I-00173 Rome, Italy
[50] Univ Roma 3, Dipartimento Fis, I-00146 Rome, Italy
来源
EUROPEAN PHYSICAL JOURNAL C | 2001年 / 20卷 / 03期
关键词
D O I
10.1007/s100520100690
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
The semileptonic branching fractions for primary and cascade b decays BR(b --> l(-)), BR(b --> c --> l(+)) and BR(b --> (c) over bar --> l(-) were measured in hadronic Z decays collected by the DELPHI experiment at LEP. The sample was enriched in b decays using the lifetime information and various techniques were used to separate leptons from direct or cascade b decays. By fitting the momentum spectra of di-leptons in opposite jets, the average b mixing parameter <(<chi>)over bar> was also extracted. The following results have been obtained: BR(b --> l(-)l(-)) = (10.70 +/- 0.08(stat) +/- 0.21(syst)(+0.44)(-0.30)(model))% BR(b --> c --> l(+)) = (7.98 +/- 0.22(stat) +/- 0.21(syst)(-0.20)(+0.14)(model))% BR(b --> (c) over bar --> l(-)) = (1.61 +/- 0.20(stat) +/- 0.17(syst)(-0.44)(+0.30)(model))% <(<chi>)over bar> = 0.127 +/- 0.013(stat) +/- 0.005(syst) +/- 0.004(model).
引用
收藏
页码:455 / 478
页数:24
相关论文
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