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Titolo:
Measurement of the topological and hadronic decay branching fractions of the tau lepton with the L3 detector at LEP
Autore:
Chen, GM;
Indirizzi:
Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China Acad Sinica Beijing Peoples R China 100039 ijing 100039, Peoples R China
Titolo Testata:
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
, volume: 98, anno: 2001,
pagine: 201 - 209
SICI:
0920-5632(200104)98:<201:MOTTAH>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANGLE BHABHA SCATTERING; LUND MONTE-CARLO; PAIR PRODUCTION; JET FRAGMENTATION; CROSS-SECTIONS; E+E-PHYSICS; Z-PEAK; COLLISIONS; ASYMMETRIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Chen, GM Acad Sinica, Inst High Energy Phys, POB 918, Beijing 100039, Peoples R China Acad Sinica POB 918 Beijing Peoples R China 100039 oples R China
Citazione:
G.M. Chen, "Measurement of the topological and hadronic decay branching fractions of the tau lepton with the L3 detector at LEP", NUCL PH B-P, 98, 2001, pp. 201-209

Abstract

Using the data collected with the L3 detector at LEP during 1992-1995 run at the Z(o) peak, corresponding to an integrated luminosity of 92.63 pb(-1), the topological and hadronic tau decay branching fractions are measured. Photon conversion, fake photon and backlash tracks are studied and rejectedin the analysis. The decay channels are identified using a set of neural networks. The topological tau decay branching fractions are B(tau --> 1-prong) = 85.14 +/- 0.27 +/- 0.17%, B(tau --> 3-prong) = 14.63 +/- 0.13 +/- 0.10% and B(tau --> 5-prong) = 0.23 +/- 0.01 +/- 0.05%. The branching fractionsof tau hadronic decays are determined: BR.(tau --> hv)=(12.51 +/- 0.12 +/-0.13)%, BR(tau --> h pi (o)nu)=(25.38 +/- 0.18 +/- 0.14)% ,BR(tau --> h2 pi (o)nu)=(8.98 +/- 0.21 +/- 0.19)% ,BR(tau --> h greater than or equal to 3pi (o)nu)=(1.77 +/- 0.14 +/- 0.15)% ,BR(tau --> 3hv)=(9.11 +/- 0.15 +/- 0.08)% ,BR(tau --> 3h pi (o)nu)=(4.77 +/- 0.19 +/- 0.10)% ,BR(tau --> 3h greater than or equal to 2 pi (o)nu)=(0.45 +/- 0.10 +/- 0.11)%, where the firsterror is statistical and the second systematic.

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Documento generato il 23/01/20 alle ore 12:15:43