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DETERMINATION OF THE MICHEL PARAMETERS AND THE TAU-NEUTRINO HELICITY IN TAU-DECAY

Authors

ALEXANDER JP BEBEK C BERGER BE BERKELMAN K BLOOM K CASSEL DG CHO HA COFFMAN DM CROWCROFT DS DICKSON M DRELL PS ECKLUND KM EHRLICH R ELIA R FOLAND AD GAIDAREV P GALIK RS GITTELMAN B GRAY SW HARTILL DL HELTSLEY BK HOPMAN PI KANDASWAMY J KIM PC KREINICK DL LEE T LIU Y LUDWIG GS MASUI J MEVISSEN J MISTRY NB NG CR NORDBERG E OGG M PATTERSON JR PETERSON D RILEY D SOFFER A VALANTSPAIGHT B WARD C ATHANAS M AVERY P JONES CD LOHNER M PRESCOTT C YELTON J ZHENG J BRANDENBURG G BRIERE RA GAO YS KIM DYJ WILSON R YAMAMATO H BROWDER TE LI F LI Y RODRIGUEZ JL BERGFELD T EISENSTEIN BI ERNST J GLADDING GE GOLLIN GD HANS RM JOHNSON E KARLINER I MARSH MA PALMER M SELEN M THALER JJ EDWARDS KW BELLERIVE A JANICEK R MACFARLANE DB MCLEAN KW PATEL PM SADOFF AJ AMMAR R BARINGER P BEAN A BESSON D COPPAGE D DARLING C DAVIS R HANCOCK N KOTOV S KRAVCHENKO I KWAK N ANDERSON S KUBOTA Y LATTERY M LEE SJ ONEILL JJ PATTON S POLING R RIEHLE T SAVINOV V SMITH A ALAM MS ATHAR SB LING Z MAHMOOD AH SEVERINI H TIMM S WAPPLER F ANASTASSOV A BLINOV S DUBOSCQ JE FISHER KD FUJINO D GAN KK HART T HONSCHEID K KAGAN H KASS R LEE J SPENCER MB SUNG M UNDRUS A WANKE R WOLF A ZOELLER MM NEMATI B RICHICHI SJ ROSS WR SKUBIC P WOOD M BISHAI M FAST J GERNDT E HINSON JW MENON N MILLER DH SHIBATA EI SHIPSEY IPJ YURKO M GIBBONS L GLENN S JOHNSON SD KWON Y ROBERTS S THORNDIKE EH JESSOP CP LINGEL K MARSISKE H PERL ML UGOLINI D WANG R ZHOU X COAN TE FADEYEV V KOROLKOV I MARAVIN Y NARSKY I SHELKOV V STAECK J STROYNOWSKI R VOLOBOUEV I YE J ARTUSO M EFIMOV A FRASCONI F GAO M GOLDBERG M HE D KOPP S MONETI GC MOUNTAIN R SCHUH S SKWARNICKI T STONE S VIEHHAUSER G XING X BARTELT J CSORNA SE JAIN V MARKA S GODANG R KINOSHITA K LAI IC POMIANOWSKI P SCHRENK S BONVICINI G CINABRO D GREENE R PERERA LP ZHOU GJ BARISH B CHADHA M CHAN S EIGEN G MILLER JS OGRADY C SCHMIDTLER M URHEIM J WEINSTEIN AJ WURTHWEIN F ASNER DM BLISS DW BREWER WS MASEK G PAAR HP PRELL S SHARMA V GRONBERG J HILL TS KUTSCHKE R LANGE DJ MENARY S MORRISON RJ NELSON HN NELSON TK QIAO C RICHMAN JD ROBERTS D RYD A WITHERELL MS BALEST R BEHRENS BH CHO K FORD WT PARK H RANKIN P ROY J SMITH JG

Citation

Jp. Alexander et al., DETERMINATION OF THE MICHEL PARAMETERS AND THE TAU-NEUTRINO HELICITY IN TAU-DECAY, Physical review. D. Particles and fields, 56(9), 1997, pp. 5320-5329

Citations number

Categorie Soggetti

Physics, Particles & Fields

Journal title

Physical review. D. Particles and fields → ACNP

ISSN journal

05562821

Volume

Issue

Year of publication

1997

Pages

5320 - 5329

Database

ISI

SICI code

0556-2821(1997)56:9<5320:DOTMPA>2.0.ZU;2-L

Abstract

Using the CLEO II detector at the Cornell Electron Storage Ring operat ed at root s=10.6 GeV, we have determined the Michel parameters rho, x i and delta in tau(-/+)-->l(-/+) nu<(nu)over bar> decay as well as the tau neutrino helicity parameter h(nu tau) in tau(-/+)-->pi(-/+)pi(0) nu decay. From a data sample of 3.02x10(6) produced tau pairs we analy zed events of the topologies e(+)e(-)-->tau(+)tau(-)-->(l(+/-)nu<(nu)o ver bar>)(pi(-/+)pi(0) nu) and e(+)e(-)-->tau(+)tau(-)-->(pi(+/-)pi(0) <(nu)over bar>)pi(-/+)pi(0) nu). We obtain rho=0.747 rho =0.747+/-0.01 0+/-0.006, xi=1.007+/-0.040+/-0.015, xi delta=0.745+/-0.026+/-0.009, a nd h(nu tau)=-0.995+/-0.010 +/-0.003, when we have used the previously determined sign of h(nu tau) [ARGUS Collaboration, H. Albrecht et al. , Z. Phys. C 58, 61 (1993); Phys. Lett. B 349, 576 (1995)]. We also pr esent the Michel parameters as determined from the electron and muon s amples separately. All results are in agreement with the standard mode l V-A interaction.