Measurement Of The Hadronic Decay Current In Tau(-)-]Tau(-)Tau(-)Tau(+)Nu(Tau)

R Akers,G Alexander,J Allison,K Ametewee,Kj Anderson,S Arcelli,S Asai,D Axen,G Azuelos,Ah Ball,E Barberio,Rj Barlow,R Bartoldus,Jr Batley,G Beaudoin,A Beck,Ga Beck,C Beeston,T Behnke,Kw Bell,G Bella,S Bentvelsen,P Berlich,S Bethke,O Biebel,Ij Bloodworth,P Bock,Hm Bosch,M Boutemeur,S Braibant,P Brightthomas,Rm Brown,A Buijs,Hj Burckhart,R Burgin,C Burgard,N Capdevielle,P Capiluppi,Rk Carnegie,Aa Carter,Jr Carter,Cy Chang,C Charlesworth,Dg Charlton,Sl Chu,Pel Clarke,Jc Clayton,Sg Clowes,I Cohen,Je Conboy,Oc Cooke,M Cuffiani,S Dado,C Dallapiccola,Gm Dallavalle,C Darling,S Dejong,La Delpozo,H Deng,M Dittmar,Ms Dixit,Ede Silva,Je Duboscq,E Duchovni,G Duckeck,Ip Duerdoth,Uc Dunwoody,Jeg Edwards,Pa Elcombe,Pg Estabrooks, Pg Etzion,Hg Evans,F Fabbri,B Fabbro,M Fanti,P Fath,M Fierro,M Finckekeeler,Hm Fischer,P Fischer,R Folman,Dg Fong,M Foucher,H Fukui,A Furtjes,P Gagnon,A Gaidot,Jw Gary,J Gascon,Ni Geddes,C Geichgimbel,Sw Gensler,Fx Gentit,T Geralis,G Giacomelli,P Giacomelli,R Giacomelli,V Gibson,Wr Gibson,Jd Gillies,J Goldberg,Dm Gingrich,Mj Goodrick,W Gorn,C Grandi,E Gross,J Hagemann,Gg Hanson,M Hansroul,Ck Hargrove,Pa Hart,M Hauschild,Cm Hawkes,E Heflin,Rj Hemingway,G Herten,Rd Heuer,Jc Hill,Sj Hillier,T Hilse,Pr Hobson,D Hochman,Rj Homer,Ak Honma,R Howard,Re Hughesjones,P Igokemenes,Dc Imrie,A Jawahery,Pw Jeffreys,H Jeremie,M Jimack,M Jones,Rwl Jones,P Jovanovic,C Jui,D Karlen,J Kanzaki,K Kawagoe,T Kawamoto,Rk Keeler,Rg Kellogg,Bw Kennedy,B King,J King,J Kirk,S Kluth,T Kobayashi,M Kobel,Ds Koetke,Tp Kokott,S Komamiya,R Kowalewski,T Kress,P Krieger,J Vonkrogh,P Kyberd,Gd Lafferty,H Lafoux,R Lahmann,Wp Lai,J Lauber,Jg Layter,P Leblanc,Am Lee,E Lefebvre,D Lellouch,C Leroy,J Letts,L Levinson,Sl Lloyd,Fk Loebinger,Gd Long,B Lorazo,Mj Losty,Xc Lou,J Ludwig,A Luig,M Mannelli,S Marcellini,C Markus,Aj Martin,Jp Martin,T Mashimo,W Matthews,P Mattig,U Maur,J Mckenna,Tj Mcmahon,Ai Mcnab,F Meijers,Fs Merritt,H Mes,A Michelini,Rp Middleton,G Mikenberg,Dj Miller,R Mir,W Mohr,A Montanari,T Mori,M Morii,U Muller,B Nellen,B Nijjhar,Sw Oneale,Fg Oakham,F Odorici,Ho Ogren,Nj Oldershaw,Cj Oram,Mj Oreglia,S Orito,F Palmonari,Jp Pansart,Gn Patrick,Mj Pearce,Pd Phillips,Je Pilcher,J Pinfold,De Plane,P Poffenberger,B Poli,A Posthaus,Tw Pritchard,H Przysiezniak,Mw Redmond,Dl Rees,D Rigby,Mg Rison,Sa Robins,D Robinson,N Rodning,Jm Roney,E Ros,Am Rossi,M Rosvick,P Routenburg,Y Rozen,K Runge,O Runolfsson,Dr Rust,M Sasaki,C Sbarra,Ad Schaile,O Schaile,F Scharf,P Scharffhansen,P Schenk,B Schmitt,M Schroder,Hc Schultzcoulon,P Schutz,M Schulz,C Schwick,J Schwiening,Wg Scott,M Settles,Tg Shears,Bc Shen,Ch Shepherdthemistocleous,P Sherwood,Gp Siroli,A Skillman,A Skuja,Am Smith,Tj Smith,Ga Snow,R Sobie,S Soldnerrembold,Rw Springer,M Sproston,A Stahl,M Starks,C Stegmann,K Stephens,J Steuerer,B Stockhausen,D Strom,P Szymanski,R Tafirout,H Takeda,T Takeshita,P Taras,S Tarem,M Tecchio,P Teixeiradias,N Tesch,Ma Thomson,O Tousignant,S Towers,M Tscheulin,T Tsukamoto,As Turcot,Mf Turnerwatson,P Utzat,R Vankooten,G Vasseur,P Vikas,M Vincter,A Wagner,Dl Wagner,Cp Ward,Dr Ward,Jj Ward,Pm Watkins,At Watson,Nk Watson,P Weber,Ps Wells,N Wermes,B Wilkens,Gw Wilson,Ja Wilson,Vh Winterer,T Wlodek,G Wolf,S Wotton,Tr Wyatt,A Yeaman,G Yekutieli,M Yurko,V Zacek,W Zeuner,Gt Zorn

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS（1995）

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Abstract

The decay tau(-) --> pi(-) pi(-) pi(+) nu(tau), has been studied using data collected with the OPAL detector at LEP during 1992 and 1993. The hadronic structure functions for this decay are measured model independently assuming G-parity invariance and neglecting scalar currents. Simultaneously the parity violating asymmetry parameter is determined to be gamma(V) (A) = 1.08(-0.41)(+0.46) (+0.14)(-0.25), consistent with the Standard Model prediction of gamma(V) (A) = 1 for left-handed tau neutrinos. Models of Kuhn and Santamaria and of Isgur et al. are used to fit distributions of the invariant 3 pi mass as well as 2 pi mass projections of the Dalitz plot. The model dependent mass and width of the a(1) resonance are measured to be m(a1) = 1.266 +/- 0.014(-0.002)(+0.012) GeV and Gamma(a1) = 0.610 +/- 0.049(-0.019)(+0.053) GeV for the Kuhn and Santa-maria model and m(a1) = 1.202 +/- 0.009(-0.001)(+0.009) GeV and Gamma(a1) = 0.422 +/- 0.023(-0.004)(+0.033) GeV for the Isgur et al. model. The model dependent values obtained for the parity violating asymmetry parameter are gamma(V) (A) = 0.87 +/- 0.27(-0.06)(+0.05) for the Kuhn and Santamaria model and gamma(V) (A) = 1.10 +/- 0.31(-0.14)(+0.13) for the Isgur et al. model. Within the Isgur et al, model the ratio of the S- and D-wave amplitudes is measured to be D/S = -0.09 +/- 0.03 +/- 0.01.

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