A MEASUREMENT OF THE LIFETIME OF THE TAU-LEPTON

被引：19

作者：

Abreu, P

Adam, W

Adami, F

Adye, T

Akesson, T

Alekseev, GD

Allen, P

Almehed, S

Alvsvaag, SJ

Amaldi, U

Anassontzis, E

Antilogus, P

Apel, WD

Apsimon, RJ

Asman, B

Astier, P

Augustin, JE

Augustinus, A

Baillon, P

Bambade, P

Barao, F

Barbiellini, G

Bardin, DY

Baroncelli, A

Barring, O

Bartl, W

Battaglia, M

Bates, MJ

Baubillier, M

Becks, KH

Beeston, CJ

Begalli, M

Beilliere, P

Belokopytov, Y

Beltran, P

Benedic, D

Benlloch, JM

Berggren, M

Bertrand, D

Bianchi, F

Bibby, JH

Bilenky, MS

Billoir, P

Bjarne, J

Bloch, D

Blyth, S

Bogolubov, PN

Bolognese, T

Bonapart, M

Bonesini, M

机构：

[1] LIP, P-1000 LISBON, PORTUGAL

[2] Osterreich Akad Wissensch, Inst Hochenergiephys, A-1050 Vienna, AUSTRIA

[3] CEN Saclay, DPhPE, F-91191 Gif Sur Yvette, FRANCE

[4] Rutherford Appleton Lab, Chilton OX11 0QX, Didcot, ENGLAND

[5] Univ Lund, Dept Phys, S-22363 Lund, SWEDEN

[6] Joint Inst Nucl Res, SU-101100 Moscow, RUSSIA

[7] Ctr Mixto Univ Valencia CSIC, Inst Fis Corpuscular IFIC, E-46100 Burjassot Valencia, SPAIN

[8] Univ Bergen, Dept Phys, N-5007 Bergen, NORWAY

[9] CERN, CH-1211 Geneva 23, SWITZERLAND

[10] Univ Athens, Phys Lab, GR-10680 Athens, GREECE

[11] Univ Lyon 1, F-69622 Villeurbanne, FRANCE

[12] Univ Karlsruhe, Inst Expt Kernphys, W-7500 Karlsruhe 1, Frg, GERMANY

[13] Univ Stockholm, Inst Phys, S-11346 Stockholm, SWEDEN

[14] Univ Paris 6, LPNHE, F-75230 Paris 05, FRANCE

[15] Univ Paris 7, LPNHE, F-75230 Paris 05, FRANCE

[16] Univ Paris 11, Lab Accelerateur Lineaire, F-91405 Orsay, FRANCE

[17] Univ Trieste, Dipartimento Fis, I-34127 Trieste, ITALY

[18] Ist Nazl Fis Nucl, I-34127 Trieste, ITALY

[19] Univ Udine, Ist Fis, I-33100 Udine, ITALY

[20] Ist Nazl Fis Nucl, Ist Super Sanita, I-00161 Rome, ITALY

[21] Univ Milan, Dipartimento Fis, I-20133 Milan, ITALY

[22] Ist Nazl Fis Nucl, I-20133 Milan, ITALY

[23] Univ Oxford, Nucl Phys Lab, Oxford OX1 3RH, ENGLAND

[24] Univ Wuppertal, Fachbereich Phys, W-5600 Wuppertal 1, Frg, GERMANY

[25] Univ Genoa, Dipartimento Fis, I-16146 Genoa, ITALY

[26] Ist Nazl Fis Nucl, I-16146 Genoa, ITALY

[27] Coll France, Lab Phys Corpusculaire, F-75231 Paris 5, FRANCE

[28] Inst High Energy Phys, SU-142284 Protvino, Moscow Region, RUSSIA

[29] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, GREECE

[30] CRN Grp DELPHI & LEPSI, Div Hautes Energies, F-67037 Strasbourg, FRANCE

[31] Univ Instelling Antwerpen, Phys Dept, B-2610 Wilrijk, BELGIUM

[32] ULB VUB, IIHE, B-1050 Brussels, BELGIUM

[33] Univ Etat Mons, Fac Sci, Serv Phys Particules Elementaires, B-7000 Mons, BELGIUM

[34] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, ITALY

[35] Ist Nazl Fis Nucl, I-10125 Turin, ITALY

[36] NIKHEF H, NL-1009 DB Amsterdam, NETHERLANDS

[37] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, ENGLAND

[38] Univ Uppsala, Dept Radiat Sci, S-75121 Uppsala, SWEDEN

[39] Univ Padua, Dipartimento Fis, I-35131 Padua, ITALY

[40] Ist Nazl Fis Nucl, I-35131 Padua, ITALY

[41] Univ Helsinki, Res Inst High Energy Phys, SF-00170 Helsinki 17, FINLAND

[42] Univ Oslo, Phys Dept, N-1000 Oslo 3, NORWAY

[43] Univ Santander, Fac Ciencias, E-39005 Santander, SPAIN

[44] Univ Roma 2, Dipartimento Fis, I-00173 Rome, ITALY

[45] Ist Nazl Fis Nucl, I-00173 Rome, ITALY

[46] Univ Bologna, Dipartimento Fis, I-40126 Bologna, ITALY

[47] Ist Nazl Fis Nucl, I-40126 Bologna, ITALY

[48] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[49] Iowa State Univ, Dept Phys, Ames, IA 50011 USA

[50] Univ Complutense, Dept Fis Atom Mol & Nucl, E-28040 Madrid, SPAIN

来源：

PHYSICS LETTERS B | 1991年 / 267卷 / 03期

关键词：

D O I：

10.1016/0370-2693(91)90957-R

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The lifetime of the tau lepton has been measured by two independent methods using a silicon microvertex detector installed in the DELPHI detector. The signed impact parameter distribution of the one prong decays yielded a lifetime of tau-tau = 321 +/- 36 (stat.) +/- 16 (syst.) fs, while the decay length distribution of three prong decays gave the result tau-tau = 310 +/- 31 (stat. ) +/- 9 (syst.) fs. The final value of the combined result was tau-tau = 314 +/- 25 fs. The ratio of the Fermi coupling constant from tau decay relative to that from muon decay was found to be 0.95 +/- 0.04, compatible with the hypothesis of lepton universality.

引用

页码：422 / 430

页数：9

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