Upper limit for the decay B- → τ-(v)over-barτ the b → τ(v)over-barτX branching ratio

被引：16

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

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 Wilrijk, Belgium

[4] Free Univ Brussels, IIHE, B-1050 Brussels, Belgium

[5] Univ 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, 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 Estadual 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] DESY, D-15735 Zeuthen, Germany

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

[19] CAS, Inst Phys, FZU, High Energy Phys Div, CZ-18040 Prague 8, Czech Republic

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

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

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

[23] HIP, FI-00014 Helsinki, Finland

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

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

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

[27] Univ Min & Met, PL-30055 Krakow, Poland

[28] Univ Paris Sud, Lab Accelerateur Lineaire, IN2P3, CNRS, FR-91405 Orsay, France

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

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

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

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

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

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

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

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

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

[38] Ist Nazl Fis Nucl, IT-20126 Milan, Italy

[39] Univ Milan, Dipartimento Fis, IT-20126 Milan, Italy

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

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

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

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

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

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

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

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

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

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

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

来源：

PHYSICS LETTERS B | 2000年 / 496卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(00)01274-0

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The branching ratio for the leptonic decay of charged B mesons (B- --> tau (-)<(<nu>)over bar>(tau)) has been measured using selected leptonic tau (-) --> l(-)nu (tau)<(<nu>)over bar>(l) and hadronic tau (-) --> nu X-tau decays in Z --> b (b) over bar decays recorded by DELPHI at LEP1 in 1992-1995. The result, BR(B- --> tau (-)<(<nu>)over bar>(tau)) < 1.1 x 10(-3) at the 90% confidence level, is consistent with standard model expectations and puts a constraint on the ratio tan <beta>/MH+/- < 0.46 (GeV/c(2))(-1) in the framework of models with two Higgs doublets (type II Higgs doublet model). From the missing energy distribution in Z --> b (b) over bar decays without identified leptons, the b --> tau<(<nu>)over bar>X-tau branching ratio has been measured in the hadronic channel tau --> nu X-tau'. The result, BR(b --> tau<(<nu>)over bar>X-tau) = (2.19 +/- 0.24 (stat) +/- 0.39 (syst))%, is consistent with the Standard Model prediction and with previous experimental measurements. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：43 / 58

页数：16

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