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AbstractAbstract
[en] The precision of τ lifetime measurements have increased remarkably in the last several years. The techniques which lead to these results are summarized and compared, together with results obtained by different experiments from use of these methods. By combining the recent, and previous lifetime values an updated world average lifetime of ττ = (291.7 ± 1.6) fs is obtained, which is in good agreement with the prediction derived from the τ electronic branching ratio through the assumption of τ-μ lepton universally
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6. international symposium on heavy-flavour physics; Pisa (Italy); 6-10 Jun 1995
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[en] In this paper the author discusses the issue of universality with respect to the tau particle. Present work is trying to attack this by looking at τντW and Zτ bar τ couplings. Some models predict that non-universality will be such a small effect that it may be only tractable with a device such as a tau-charm factory. The issue of universality has impacts in other electroweak reactions, and in many models. The observation of such effects may require very high luminosity however
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Beers, L.V.; Perl, M.L. (eds.); Stanford Linear Accelerator Center, Menlo Park, CA (United States); 763 p; Oct 1994; p. 720-743; Tau-Charm factory in the era of B-factories and CESR conference; Stanford, CA (United States); 15-16 Aug 1994; Also available from OSTI as DE95007894; NTIS; US Govt. Printing Office Dep
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Wang, W.F.; Orsay, LAL
Stanford Linear Accelerator Center SLAC (United States). Funding organisation: US Department of Energy (United States)2007
Stanford Linear Accelerator Center SLAC (United States). Funding organisation: US Department of Energy (United States)2007
AbstractAbstract
[en] We present a review of BaBar results on e+e- → hadrons using the initial state radiation technique. Cross sections over the √s range from threshold to 4-5 GeV, with very small point-to-point systematic errors, are presented for the π+π-π0, 2(π+π-), 2(K+K-), 3(π+π-), 2(π+π-)2π0, 2(π+π-)K+K-, and p(bar p) final states. The preliminary results of e+e- → K+K-π+π- and e+e- → K+K-π0π0 cross sections are also presented
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24 Oct 2007; 6 p; Tau 06: 9. International Workshop on Tau Lepton Physics; Pisa (Italy); 19-22 Sep 2006; AC02-76SF00515; Available from http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-12922.pdf; PURL: https://www.osti.gov/servlets/purl/918528-5QnSH5/; Nucl.Phys.Proc.Suppl.169:282-287,2007
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AbstractAbstract
[en] Based on 3.26 fb-1 data sample collected at CLEO III, we study the decay τ- a K+ K- π- ντ and improve the measurement of the branching ratio B(τ- a K+ K- π- ντ) = (1.59 ± 0.06 ± 0.13) x 10-3, the results preliminary
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7. international workshop on tau lepton physics; Santa Cruz, CA (United States); 10-13 Sep 2002; S0920563203803079; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Uruguay
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AbstractAbstract
[en] A method of the τ lepton lifetime measurement improving the present accuracy by a factor of about two is reported. The value of an upper limit on the relative lifetime difference between positive and negative τ leptons is obtained. These results are based on 711fb-1 of data collected at the Y(4S) resonance.
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11. international workshop on tau lepton physics; Manchester (United Kingdom); 13-17 Sep 2010; S0920-5632(11)00561-5; Available from http://dx.doi.org/10.1016/j.nuclphysbps.2011.06.029; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Ghosh, Sovan; Choudhury, Amarjyoti; Sarma, Jayanta Kumar
Proceedings of the twentieth DAE-BRNS high energy physics symposium: programme abstracts2013
Proceedings of the twentieth DAE-BRNS high energy physics symposium: programme abstracts2013
AbstractAbstract
[en] Anomalous magnetic moment of the electron, muon and tau are given by theoretical and experimental analysis. Magnetic moment is related to the charge and the mass of the corresponding lepton. Using the concept of the helical motion of the charge of the electron, we obtained first the expression of the magnetic moment that is analogous to the anomalous magnetic moment of the electron in the order of the fine structure constant. Later we used the convention of fractional charge of the electron to step ahead in the quantum domain from the semi-classical approach. The masses of leptons are arranged in a α-quantized manner by MacGregor in terms of mass of the electron. Using those relations we have reproduced the magnetic moment of muon and tau and they are in good agreement with contemporary results. (author)
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Visva-Bharati, Kolkata (India); 154 p; 2013; p. 23; 20. DAE-BRNS high energy physics symposium; Kolkata (India); 13-18 Jan 2013
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Giorgi, Marcello A.
SLAC National Accelerator Laboratory (United States). Funding organisation: US Department of Energy (United States)2011
SLAC National Accelerator Laboratory (United States). Funding organisation: US Department of Energy (United States)2011
AbstractAbstract
[en] We report the results of search for the neutrinoless lepton-flavor violating decay of the tau lepton into three charged leptons, performed using 376 fb-1 of data collected at an e+e- center-of-mass energy around 10.58 GeV with the BaBar detector at the PEP-II. In all six decay modes considered, the number of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (4-8) x 10-8 at 90% confidence level.
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30 Nov 2011; 7 p; TAU08: 10. International Workshop on Tau Lepton Physics; Novosibirk (Russian Federation); 22-25 Sep 2008; AC02-76SF00515; Available from Nuclear Physics B - Proceedings Supplements; Volume 189, pages 166-172 (Apr 2009)
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Hayes, K.G.
Proceedings of the tau-charm factory workshop. Study of tau, charm and J/ψ physics; development of high luminosity e+e- rings; design of e+e- detectors for tau-charm physics1989
Proceedings of the tau-charm factory workshop. Study of tau, charm and J/ψ physics; development of high luminosity e+e- rings; design of e+e- detectors for tau-charm physics1989
AbstractAbstract
[en] The present status of the tau one prong problem is reviewed. Emphasis is placed on recent published branching fraction measurements, the status and implications of tau lifetime measurements, and measurements which constrain the sum of branching fractions to be unity
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Beers, L.V. (ed.); Stanford Linear Accelerator Center, Menlo Park, CA (USA); 976 p; Jun 1989; p. 90-112; Tau-Charm Factory workshop; Stanford, CA (USA); 23-27 May 1989; CONF-8905144--; NTIS, PC A99/MF A01 as DE90001785
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AbstractAbstract
[en] The status of the Monte Carlo programs for the simulation of the τ-lepton production and decay in high energy accelerator experiments is reviewed. In particular, the status of the following packages is discussed: (i) TAUOLA for τ-lepton decay and PHOTOS for radiative corrections in decays, (ii) MC-TESTER for universal tests of the Monte Carlo programs describing particle decays, (iii) KORALB, KORALZ, KKMC packages for τ-pair production in e+e- collisions, and (iv) universal interface of TAUOLA for the decay of τ-leptons produced by 'any' generator
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7. international workshop on tau lepton physics; Santa Cruz, CA (United States); 10-13 Sep 2002; S092056320302190X; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: Uruguay
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Lafferty, G.D.
Stanford Linear Accelerator Center SLAC (United States). Funding organisation: US Department of Energy (United States)2007
Stanford Linear Accelerator Center SLAC (United States). Funding organisation: US Department of Energy (United States)2007
AbstractAbstract
[en] We have searched for the violation of baryon number B and lepton number L in the (B - L)-conserving modes τ- → (bar Λ)π- and τ- → (bar Λ)K- as well as the (B - L)-violating modes τ- → Λπ- and τ- → ΛK- using 237 fb-1 of data collected with the BaBar detector at the PEP-II asymmetric-energy e+e- storage rings. We do not observe any signal and we determine preliminary upper limits on the branching fractions Β(τ- → (bar Λ)π-) < 5.9 x 10-8, Β(τ-→ Λπ-) < 5.8 x 10-6, Β(τ- → (bar Λ)K-) < 7.2 x 10-8, and Β(τ- → ΛK-) < 15 x 10-8 at 90% confidence level
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16 Nov 2007; 6 p; Tau06: 9. International Workshop on Tau Lepton Physics; Pisa (Italy); 19-22 Sep 2006; AC02-76SF00515; Available from http://www.slac.stanford.edu/cgi-wrap/pubpage?slac-pub-13006.html; PURL: https://www.osti.gov/servlets/purl/920019-7SoJSv/; Nucl.Phys.Proc.Suppl.169:186-191,2007
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