ITA
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DETERMINATION OF THE MICHEL PARAMETERS RHO, XI, AND DELTA IN TAU-LEPTON DECAYS WITH TAU-]RHO-NU TAGS

Authors

ALBRECHT H HAMACHER T HOFMANN RP KIRCHHOFF T MANKEL R NAU A NOWAK S RESSING D SCHRODER H SCHULZ HD WALTER M WURTH R HAST C KAPITZA H KOLANOSKI H KOSCHE A LANGE A LINDNER A SCHIEBER M SIEGMUND T THURN H TOPFER D WEGENER D FRANKL C GRAF J SCHMIDTLER M SCHRAMM M SCHUBERT KR SCHWIERZ R SPAAN B WALDI R REIM K WEGENER H ECKMANN R KUIPERS H MAI O MUNDT R OEST T REINER R ROHDE A SCHMIDTPARZEFALL W STIEWE J WERNER S EHRET K HOFMANN W HUPPER A KNOPFLE KT SPENGLER J KRIEGER P MACFARLANE DB PRENTICE JD SAULL PRB TZAMARIUDAKI K VANDEWATER RG YOON TS SCHNEIDER M WESELER S BRACKO M KERNEL G KRIZAN P KRIZNIC E MEDIN G PODOBNIK T ZIVKO T BALAGURA V BARSUK S BELYAEV I CHISTOV R DANILOV M EIGES V GERSHTEIN L GERSHTEIN Y GOLUTVIN A IGONKINA O KOROLKO I KOSTINA G LITVINTSEV D PAKHLOV P SEMENOV S SNIZHKO A TICHOMIROV I ZAITSEV Y

Citation

H. Albrecht et al., DETERMINATION OF THE MICHEL PARAMETERS RHO, XI, AND DELTA IN TAU-LEPTON DECAYS WITH TAU-]RHO-NU TAGS, Physics letters. Section B, 431(1-2), 1998, pp. 179-187

Citations number

Categorie Soggetti

Physics

Journal title

Physics letters. Section B → ACNP

ISSN journal

03702693

Volume

431

Issue

1-2

Year of publication

1998

Pages

179 - 187

Database

ISI

SICI code

0370-2693(1998)431:1-2<179:DOTMPR>2.0.ZU;2-Y

Abstract

Using the ARGUS detector at the e(+)e(-) storage ring DORIS II, we hav e measured the Michel parameters rho,xi, and xi delta for tau(+/-) --> l (+/-) v (v) under bar decays in tau-pair events produced at center of mass energies in the region of the tau resonances. Using tau(-/+) - -> rho(-/+) v as spin analyzing tags, we find rho(e) = 0.68 +/- 0.04 /- 0.08, xi(e) = 1.12 +/- 0.20 +/- 0.09, xi delta(e) = 0.57 +/- 0.14 /- 0.07, rho(mu)= 0.69 +/- 0.06 +/- 0.08, xi(mu) = 1.25 +/- 0.27 +/- 0 .14 and xi delta(mu) = 0.72 +/- 0.18 +/- 0.10. In addition, we report the combined ARGUS results on rho, xi, and xi delta using this work an d previous measurements. (C) 1998 Elsevier Science B.V. All rights res erved.