MEASUREMENT OF THE TAU-POLARIZATION AT THE Z-RESONANCE

Authors
BUSKULIC D DECAMP D GOY C LEES JP MINARD MN MOURS B PIETRZYK B ALEMANY R ARIZTIZABAL F COMAS P CRESPO JM DELFINO M FENANDEZ E FERNANDEZBOSMAN M GAITAN V GARRIDO L MATTISON T PACHECO A PADILLA C PASCUAL A CREANZA D DEPALMA M FARILLA A IASELLI G MAGGI G MAGGI M NATALI S NUZZO S QUATTROMINI M RANIERI A RASO G ROMANO F RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P ZITO G CHAI Y HU H HUANG D HUANG X LIN J WANG T XIE Y XU D XU R ZHANG J ZHAO W BAUERDICK LAT BLUCHER E BONVICINI G BOUDREAU J CASPER D DREVERMANN H FORTY RW GANIS G GAY C HAGELBERG R HARVEY J HAYWOOD S HILGART J JACOBSEN R JOST B KNOBLOCH J LEHRAUS I LOHSE T LUSIANI A MARTINEZ M MATO P MEINHARD H MINTEN A MIOTTO A MIQUEL R MOSER HG PALAZZI P PERLAS JA PUSZTASZERI JF RANJARD F REDLINGER G ROLANDI L ROTHBERG J RUAN T SAICH M SCHLATTER D SCHMELLING M SEFKOW F TEJESSY W WACHSMUTH H WIEDENMANN W WILDISH T WITZELING W WOTSCHACK J AJALTOUNI Z BADAUD F BARDADINOTWINOWSKA M ELFELLOUS R FALVARD A GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J PRULHIERE F SAADI F FEARNLEY T HANSEN JD HANSEN JR HANSEN PH MOLLERUD R NILSSON BS CANDLIN DJ PARSONS MI VEITCH E MONETA L PARRINI G CORDEN M GEORGIOPOULOS C IKEDA M LANNUTTI J LEVINTHAL D MERMIKIDES M SAWYER L WASSERBAECH S ANTONELLI A BALDINI R BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CERUTTI F CHIARELLA V DETTORREPIAZZOLI B FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M PICCHI P COLRAIN P TENHAVE I LYNCH JG MAITLAND W MORTON WT RAINE C REEVES P SCARR JM SMITH K SMITH MG THOMPSON AS TURNBULL RM BRANDL B BRAUN O GEWENIGER C HANKE P HEPP V KLUGE EE MAUMARY Y PUTZER A RENSCH B STAHL A TITTEL K WUNSCH M BELK AT BEUSELINCK R BINNIE DM CAMERON W CATTANEO M COLLING DJ DORNAN PJ DUGEAY S GREENE AM HASSAED JF LIESKE NM NASH J PAYNE DG PHILLIPS MJ SEDGBEER JK TOMALIN IR WRIGHT AG GIRTLER P KNERINGER E KUHN D RUDOLPH G BOWDERY CK BRODBECK TJ FINCH AJ FOSTER F HUGHES G JACKSON D KEEMER NR NUTTALL M PATEL A SLOAN T SNOW SW WHELAN EP EFTHYMIOPOULOS I KYRIAKIS A SIMOPOULOU E VAYAKI A ZACHARIADOU K BADIER J BLONDEL A BONNEAUD G BRIENT JC FOUQUE G ORTEU S ROUGE A RUMPF M TANAKA R VERDERI M VIDEAU H ADLUNG S ASSMANN R BAUER C BLUM W BROWN D CATTANEO P DEHNING B DIETL H DYDAK F FRANK M HALLEY AW LAUBER J LUTJENS G LUTZ G MANNER W RICHTER R ROTSCHEIDT H SCHRODER J SCHWARZ AS SETTLES R SEYWERD H STIERLIN U STIEGLER U STDENIS R WOLF G BOUCROT J CALLOT O CORDIER A DAVIER M DUFLOT L GRIVAZ JF HEUSSE P JAFFE DE JANOT P KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM SCHUNE MH VEILLET JJ VIDEAU I ZHANG Z ABBANEO D BAGLIESI G BATIGNANI G BOSISIO L BOTTIGLI U BOZZI C CALDERINI G CARPINELLI M CIOCCI MA DELLORSO R FERRANTE I FIDECARO F FOA L FOCARDI E FORTI F GIASSI A GIORGI MA GREGORIO A LIGABUE F MANNELLI EB MARROCCHESI PS MESSINEO A PALLA F RIZZO G SANGUINETTI G SPAGNOLO P STEINBERGER J TENCHINI R TONELLI G TRIGGIANI G VANNINI C VENTURI A VERDINI PG WALSH J BETTERIDGE AP CARTER JM GREEN MG MARCH PV MIR LM MEDCALF T QUAZI IS STRONG JA WEST LR BOTTERILL DR CLIFFT RW EDGECOCK TR EDWARDS M FISHER SM JONES TJ NORTON PR SALMON DP THOMPSON JC KLEINKNECHT K RAAB J RENK B SANDER HG SCHMIDT H STEEG F WALTHER SM WANKE R WOLF B AUBERT JJ BENCHEIKH AM BENCHOUK C BONISSENT A CARR J COYLE P DRINKARD J ETIENNE F NICOD D PAPALEXIOU S PAYRE P ROOS L ROUSSEAU D SCHWEMLING P TALBY M BLOCHDEVAUX B COLAS P DUARTE H KOZANECKI W LANCON E LEMAIRE MC LOCCI E PEREZ P PERRIER F RANDER J RENARDY JF ROSOWSKY A ROUSSARIE A SCHULLER JP SCHWINDLING J MOHAND DS VALLAGE B JOHNSON RP LITKE AM TAYLOR G WEAR J ASHMAN JG BABBAGE W BOOTH CN BUTTAR C CARNEY RE CARTWRIGHT S COMBLEY F HATFIELD F THOMPSON LF BARBERIO E BOHRER A BRANDT S COWAN G GRUPEN C LUTTERS G RIVERA F SCHAFER U DELLAMARINA R GIANNINI G GOBBO B RAGUSA F BELLANTONI L CHEN W CINABRO D CONWAY JS COWEN DF FENG Z FERGUSON DPS GAO YS GRAHL J HARTON JL JARED RC LECLAIRE BW LISHKA C PAN YB PATER JR SAADI Y SCHMITT M SHARMA V SHI ZH WALSH AM WEBER FV WU SL WU X ZHENG M ZOBERNIG G
Citation
D. Buskulic et al., MEASUREMENT OF THE TAU-POLARIZATION AT THE Z-RESONANCE, Zeitschrift fur Physik. C, Particles and fields, 59(3), 1993, pp. 369-386
Citations number
23
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
59
Issue
3
Year of publication
1993
Pages
369 - 386
Database
ISI
SICI code
0170-9739(1993)59:3<369:MOTTAT>2.0.ZU;2-0
Abstract
Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes tau-->enunuBAR, tau-->mununuB AR, tau-->rhonu tau-->a1nu, using both the individual tau decay kinema tics and the event acollinearity. The measurement of the tau polarisat ion as a function of the production polar angle yields the two paramet ers A(tau) and A(e), where A(l) = 2g(V)l g(A)l/[(g(V)l)2 + (g(A)l)2]. The results A(tau) = 0.143 +/- 0.023 and A(e) = 0. 120 +/- 0.026 are c onsistent with the hypothesis of electron-tau universality. Assuming u niversality yields a measurement of the effective weak mixing angle si n 2theta(W)eff = 0.2332 +/- 0.0022.