IMPROVED TAU-POLARIZATION MEASUREMENT

Authors
BUSKULIC D CASPER D DEBONIS I DECAMP D GHEZ P GOY C LEES JP MINARD MN ODIER P PIETRZYK B ARIZTIZABAL F CHMEISSANI M CRESPO JM EFTHYMIOPOULOS I FERNANDEZ E FERNANDEZBOSMAN M GAITAN V GARRIDO L MARTINEZ M ORTEU S PACHECO A PADILLA C PALLA F PASCUAL A PERLAS JA SANCHEZ F TEUBERT F CREANZA D DEPALMA M FARILLA A IASELLI G MAGGI G MARINELLI N NATALI S NUZZO S RANIERI A RASO G ROMANO F RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P ZITO G HUANG X LIN J OUYANG Q WANG T XIE Y XU R XUE S ZHANG J ZHANG L ZHAO W BONVICINI G CATTANEO M COMAS P COYLE P DREVERMANN H ENGELHARDT A FORTY RW FRANK M GIRONE M HAGELBERG R HARVEY J JACOBSEN R JANOT P JOST B KNOBLOCH J LEHRAUS I MAGGI M MARKOU C MARTIN EB MATO P MEINHARD H MINTEN A MIQUEL R OEST T PALAZZI P PATER JR PERRODO P PUSZTASZERI JF RANJARD F RENSING P ROLANDI L SCHLATTER D SCHMELLING M SCHNEIDER O TEJESSY W TOMALIN IR VENTURI A WACHSMUTH H WIEDENMANN W WILDISH T WITZELING W WOTSCHACK J AJALTOUNI Z BARDADINOTWINOWSKA M BARRES A BOYER C FALVARD A GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTEIL S MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J ROSSIGNOL JM SAADI F FEARNLEY T HANSEN JB HANSEN JD HANSEN JR HANSEN PH NILSSON BS KYRIAKIS A SIMOPOULOU E SIOTIS I VAYAKI A ZACHARIADOU K BLONDEL A BONNEAUD G BRIENT JC BOURDON P PASSALACQUA L ROUGE A RUMPF M TANAKA R VALASSI A VERDERI M VIDEAU H CANDLIN DJ PARSONS MI FOCARDI E PARRINI G CORDEN M DELFINO M GEORGIOPOULOS C JAFFE DE ANTONELLI A BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CERUTTI F CHIARELLA V FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PEPEALTARELLI M DORRIS SJ HALLEY AW TENHAVE I KNOWLES IG LYNCH JG MORTON WT OSHEA V RAINE C REEVES P SCARR JM SMITH K SMITH MG THOMPSON AS THOMPSON F THORN S TURNBULL RM BECKER U BRAUN O GEWENIGER C GRAEFE G HANKE P HEPP V KLUGE EE PUTZER A RENSCH B SCHMIDT M SOMMER J STENZEL H TITTEL K WUNSCH M BEUSELINCK R BINNIE DM CAMERON W COLLING DJ DORNAN PJ KONSTANTINIDIS N MONETA L MOUTOUSSI A NASH J SANMARTIN G SEDGBEER JK STACEY AM DISSERTORI G GIRTLER P KNERINGER E KUHN D RUDOLPH G BOWDERY CK BRODBECK TJ COLRAIN P CRAWFORD G FINCH AJ FOSTER F HUGHES G SLOAN T WHELAN EP WILLIAMS MI GALLA A GREENE AM KLEINKNECHT K QUAST G RAAB J RENK B SANDER HG WANKE R ZEITNITZ C AUBERT JJ BENCHEIKH AM BENCHOUK C BONISSENT A BUJOSA G CALVET D CARR J DIACONU C ETIENNE F THULASIDAS M NICOD D PAYRE P ROUSSEAU D TALBY M ABT I ASSMANN R BAUER C BLUM W BROWN D DIETL H DYDAK F GOTZHEIN C JAKOBS K KROHA H LUTJENS G LUTZ G MANNER W MOSER HG RICHTER R ROSADOSCHLOSSER A SCHWARZ AS SETTLES R SEYWERD H STIERLIN U DENIS RS WOLF G ALEMANY R BOUCROT J CALLOT O CORDIER A COURAULT F DAVIER M DUFLOT L GRIVAZ JF HEUSSE P JACQUET M KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM MUSOLINO G NIKOLIC I PARK HJ PARK IC SCHUNE MH SIMION S VEILLET JJ VIDEAU I AZZURRI P ABBANEO D BAGLIESI G BATIGNANI G BETTARINI S BOZZI C CALDERINI G CARPINELLI M CIOCCI MA CIULLI V DELLORSO R FERRANTE I FOA L FORTI F GIASSI A GIORGI MA GREGORIO A LIGABUE F LUSIANI A MARROCCHESI PS MESSINEO A RIZZO G SANGUINETTI G SCIABA A SPAGNOLO P STEINBERGER J TENCHINI R TONELLI G TRIGGIANI G VANNINI C VERDINI PG WALSH J BETTERIDGE AP BLAIR GA BRYANT LM GAO Y GREEN MG JOHNSON DL MEDCALF T MIR LM STRONG JA BERTIN V BOTTERILL DR CLIFFT RW EDGECOCK TR HAYWOOD S EDWARDS M MALEY P NORTON PR THOMPSON JC BLOCHDEVAUX B COLAS P DUARTE H EMERY S KOZANECKI W LANCON E LEMAIRE MC LOCCI E MARX B PEREZ P RANDER J RENARDY JF ROSOWSKY A ROUSSARIE A SCHULLER JP SCHWINDLING J MOHAND DS TRABELSI A VALLAGE B JOHNSON RP LITKE AM TAYLOR G WEAR J BEDDALL A BOOTH CN BOSWELL R CARTWRIGHT S COMBLEY F DAWSON I KOKSAL A LETHO M NEWTON WM RANKIN C THOMPSON LF BOHRER A BRANDT S COWAN G FEIGL E GRUPEN C LUTTERS G MINGUETRODRIGUEZ J RIVERA F SARAIVA P SMOLIK L STEPHAN F BOSISIO I DELLAMARINA R GANIS G GIANNINI G GOBBI B PITIS L RAGUSA F KIM H ROTHBERG J WASSERBAECH S ARMSTRONG SR BELLANTONI L ELMER P FENG Z FERGUSON DPS GAO YS GONZALEZ S GRAHL J HARTON JL HAYES OJ HU H MCNAMARA PA NACHTMAN JM OREJUDOS W PAN YB SAADI Y SCHMITT M SCOTT IJ SHARMA V TURK JD WALSH AM WEBER FV WU SL WU X YAMARTINO JM ZHENG M ZOBERNIG G
Citation
D. Buskulic et al., IMPROVED TAU-POLARIZATION MEASUREMENT, Zeitschrift fur Physik. C, Particles and fields, 69(2), 1996, pp. 183-193
Citations number
22
Categorie Soggetti
Physics, Particles & Fields
Journal title
Zeitschrift fur Physik. C, Particles and fields → ACNP
ISSN journal
01709739
Volume
69
Issue
2
Year of publication
1996
Pages
183 - 193
Database
ISI
SICI code
0170-9739(1996)69:2<183:ITM>2.0.ZU;2-M
Abstract
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 th e tau leptons decaying into e nu nu, mu nu nu,pi nu and a(1) nu from t heir individual decay product distributions. The measurement of the ta u polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where, in terms of the axial and vecto r couplings g(Al) and g(nu l), A(l) = 2 g(nu l) g(Al)/(g(nu l)(2) + g( Al)(2)). This analysis follows to a large extent the methods devised f or the 1990 and 1991 data but with improvements which bring a better u nderstanding of the systematic uncertainties. Combining the 1992 measu rements with our previously published results yields A(tau) = 0.136 +/ - 0.012 +/- 0.009 and A(e) = 0.129 +/- 0.016 +/- 0.005. Assuming e-tau universality, the measurements imply an effective weak mixing angle o f sin(2) theta(W)(eff) = 0.2332 +/- 0.0014.