共查询到20条相似文献,搜索用时 15 毫秒
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Yelton JM Dorfan JM Abrams GS Amidel D Baden AR Barklow T Boyarski AM Boyer J Breidenbach M Burchat P Burke DL Butler F Feldman GJ Gladney LD Gidal G Gold MS Goldhaber G Golding L Haggerty J Hanson G Hayes K Herrup D Hollebeek RJ Innes WR Jaros JA Juricic I Kadyk JA Karlen D Lankford AJ Larsen RR Leclaire BW Levi ME Lockyer NS Lüth V Matteuzzi C Nelson ME Ong RA Perl ML Richter B Riles K Ross MC Rowson PC Schadd T Schellman H Schmidke WB Sheldon PD Trilling GH de la Vaissiere C Wood DR Zaiser C 《Physical review letters》1986,56(8):812-814
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Balest R Cho K Ford WT Lohner M Park H Rankin P Smith JG Alexander JP Bebek C Berger BE Berkelman K Bloom K Browder TE Cassel DG Cho HA Coffman DM Crowcroft DS Dickson M Drell PS Dumas DJ Ehrlich R Elia R Gaidarev P Garcia-Sciveres M Gittelman B Gray SW Hartill DL Heltsley BK Henderson S Jones CD Jones SL Kandaswamy J Katayama N Kim PC Kreinick DL Lee T Liu Y Ludwig GS Masui J Mevissen J Mistry NB Ng CR Nordberg E Patterson JR Peterson D Riley D Soffer A Avery P Freyberger A Lingel K Prescott C 《Physical review letters》1995,75(21):3809-3813
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Barklow T Innes WR Petradza M Snyder A Stoker DP Wagner SR Abrams GS Amidei D Baden AR Boyarski AM Boyer J Burchat PR Burke DL Butler F Dorfan JM Feldman GJ Gidal G Gladney L Gold MS Goldhaber G Golding LJ Haggerty J Hanson G Hayes K Herrup D Hollebeek RJ Jaros JA Juricic I Kadyk JA Karlen D Lankford AJ Larsen RR LeClaire BW Levi ME Lockyer NS Lüth V Nelson ME Ong RA Perl ML Richter B Riles K Rowson PC Schaad T Schellman H Schmidke WB Sheldon PD Trilling GH Wood DR Yelton JM 《Physical review letters》1992,69(1):13-16
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Aihara H Alston-Garnjost M Avery RE Barbaro-Galtieri A Barker AR Barnes AV Barnett BA Bauer DA Bengtsson H Bintinger DL Bobbink GJ Bolognese TS Bross AD Buchanan CD Buijs A Caldwell DO Clark AR Cowan GD Crane DA Dahl OI Derby KA Eastman JJ Eberhard PH Edberg TK Eisner AM Enomoto R Erné FC Fujii T Gary JW Gorn W Hauptman JM Hofmann W Huth JE Hylen J Kamae T Kaye HS Kees KH Kenney RW Kerth LT Ko W Koda RI Kofler RR Kwong KK Lander RL Langeveld WG Layter JG Linde FL Lindsey CS Loken SC Lu A Lu X 《Physical review letters》1987,59(7):751-754
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ALEPH Collaboration D. Buskulic D. Casper I. De Bonis D. Decamp P. Ghez C. Goy J. P. Lees M. N. Minard P. Odier et al. 《Zeitschrift fur Physik C Particles and Fields》1995,69(1):183-193
Using 22 pb−1 of data collected at LEP in 1992 on the peak of the Z resonance, the ALEPH collaboration has measured the polarisation of
the tau leptons decaying into
,πν, ρν and a1
ν from their individual decay product distributions. The measurement of the tau polarisation as a function of the production
polar angle yields the two parametersN
τ andN
e, where, in terms of the axial and vector couplingsg
Al andg
Vl,N
l=2g
Vl gAl/(g
Vl
2
+g
Al
2
). This analysis follows to a large extent the methods devised for the 1990 and 1991 data but with improvements which bring
a better understanding of the systematic uncertainties. Combining the 1992 measurements with our previously published results
yieldsN
τ=0.136±0.012±0.009 andN
e=0.129±0.016±0.005. Assuminge−τ universality, the measurements imply an effective weak mixing angle of sin
2
θ
W
eff
=0.2332±0.0014.
Deceased 相似文献
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Bartelt J Csorna SE Jain V Marka S Freyberger A Gibaut D Kinoshita K Pomianowski P Schrenk S Cinabro D Barish B Chadha M Chan S Eigen G Miller JS O'Grady C Schmidtler M Urheim J Weinstein AJ Würthwein F Asner DM Athanas M Bliss DW Brower WS Masek G Paar HP Gronberg J Korte CM Kutschke R Menary S Morrison RJ Nakanishi S Nelson HN Nelson TK Qiao C Richman JD Roberts D Ryd A Tajima H Witherell MS Balest R Cho K Ford WT Lohner M Park H Rankin P Roy J Smith JG Alexander JP Bebek C Berger BE 《Physical review letters》1996,76(22):4119-4123
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Mills GB Pal T Atwood WB Baillon PH Barish BC Bonneaud GR Courau A Donaldson GJ Dubois R Duro MM Elsen EE Gao SG Huang YZ Irwin GM Johnson RP Kichimi H Kirkby J Klem DE Koop DE Ludwig J Ogawa A Perret-Gallix D Pitthan R Pollard DL Prescott CY Rivkin LZ Rochester LS Ruckstuhl W Sakuda M Sherman SS Siskind EJ Stroynowski R Wang SQ Wojcicki SG Yamamoto H Yan WG Young CC 《Physical review letters》1985,54(7):624-627
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The partial width of the τ → e - v e v τ can be calculated from the tau mass, lifetime and branching ratio. The increasing precision on these measurements is making the partial width sensitive to the mass of the tau neutrino. We present the tau neutrino mass dependence on the partial width and show that this leads to a limit of m r < 71 MeV at the 95% confidence level. We show that the limit is determined by the uncertainty in the tau lifetime and τ → e?v e v τ branching ratio. Additional measurements of these values are expected in the next few years and we show that the limit could become competitive with the direct measurements. 相似文献
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G. D. Lafferty 《中国物理 C》2010,34(6):907-911
The BABAR experiment has now completed data taking and with an integrated luminosity of 531 fb^-1 of e^+e^- collision data has recorded some 480 million tau-pair events. Various studies of suppressed, rare and forbidden decays of the tau have been conducted, including searches for high-multiplicity decays, for second-class hadronic weak currents, and for lepton-flavour violation. 相似文献
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Yu. P. Ivanov G. V. Mitselmakher A. A. Osipov 《Zeitschrift fur Physik C Particles and Fields》1991,50(1):113-121
The possibility of the experimental investigation of the radiative tau decay into pion is discussed including background conditions. The decay width is estimated to be Br(τ→v τ π γ)=0.15% (at the minimal registered photon energy 50 MeV). The contribution of the structural component is 10% of the total radiation. The main background is produced by photons from the τ→v τ π ? π 0 decay. We investigate the angular and energy spectra of the decay products and analyse the background conditions. The kinematic region was found where the structural radiation dominates over background. 相似文献