MEASUREMENT OF THE TAU-NEUTRINO HELICITY AND MICHEL PARAMETERS IN POLARIZED E(-) COLLISIONS()E()

Authors
ABE K ABE K AKAGI T ALLEN NJ ASH WW ASTON D BAIRD KG BALTAY C BAND HR BARAKAT MB BARANKO G BARDON O BARKLOW TL BASHINDZHAGYAN GL BAZARKO AO BENDAVID R BENVENUTI AC BILEI GM BISELLO D BLAYLOCK G BOGART JR BOLEN B BOLTON T BOWER GR BRAU JE BREIDENBACH M BUGG WM BURKE D BURNETT TH BURROWS PN BUSZA W CALCATERRA A CALDWELL DO CALLOWAY D CAMANZI B CARPINELLI M CASSELL R CASTALDI R CASTRO A CAVALLISFORZA M CHOU A CHURCH E COHN HO COLLER JA COOK V COTTON R COWAN RF COYNE DG CRAWFORD G DOLIVEIRA A DAMERELL CJS DAOUDI M DESANGRO R DELLORSO R DERVAN PJ DIMA M DONG DN DU PYC DUBOIS R EISENSTEIN BI ELIA R ETZION E FAHEY S FALCIAI D FAN C FERNANDEZ JP FERO MJ FREY R FURUNO K GILLMAN T GLADDING G GONZALEZ S HART EL HARTON JL HASAN A HASEGAWA Y HASUKO K HEDGES SJ HERTZBACH SS HILDRETH MD HUBER J HUFFER ME HUGHES EW HWANG H IWASAKI Y JACKSON DJ JACQUES P JAROS JA JOHNSON AS JOHNSON JR JOHNSON RA JUNK T KAJIKAWA R KALELKAR M KANG HJ KARLINER I KAWAHARA H KENDALL HW KIM YD KING ME KING R KOFLER RR KRISHNA NM KROEGER RS LABS JF LANGSTON M LATH A LAUBER JA LEITH DWGS LIA V LIU MX LIU X LORETI M LU A LYNCH HL MA J MANCINELLI G MANLY S MANTOVANI G MARKIEWICZ TW MARUYAMA T MASUDA H MAZZUCATO E MCKEMEY AK MEADOWS BT MESSNER R MOCKETT PM MOFFEIT KC MOORE TB MULLER D NAGAMINE T NARITA S NAUENBERG U NEAL H NUSSBAUM M OHNISHI Y OSBORNE LS PANVINI RS PARK CH PARK H PAVEL TJ PERUZZI I PICCOLO M PIEMONTESE L PIERONI E PITTS KT PLANO RJ PREPOST R PRESCOTT CY PUNKAR GD QUIGLEY J RATCLIFF BN REEVES TW REIDY J REINERTSEN PL RENSING PE ROCHESTER LS ROWSON PC RUSSELL JJ SAXTON OH SCHALK T SCHINDLER RH SCHUMM BA SEN S SERBO VV SHAEVITZ MH SHANK JT SHAPIRO G SHERDEN DJ SHMAKOV KD SIMOPOULOS C SINEV NB SMITH SR SMY MB SNYDER JA STAMER P STEINER H STEINER R STRAUSS MG SU D SUEKANE F SUGIYAMA A SUZUKI S SWARTZ M SZUMILO A TAKAHASHI T TAYLOR FE TORRENCE E TRANDAFIR AI TURK JD USHER T VAVRA J VANNINI C VELLA E VENUTI JP VERDIER R VERDINI PG WAGNER DL WAGNER SR WAITE AP WATTS SJ WEIDEMANN AW WEISS ER WHITAKER JS WHITE SL WICKENS FJ WILLIAMS DA WILLIAMS DC WILLIAMS SH WILLOCQ S WILSON RJ WISNIEWSKI WJ WOODS M WORD GB WYSS J YAMAMOTO RK YAMARTINO JM YANG X YASHIMA J YELLIN SJ YOUNG CC YUTA H ZAPALAC G ZDARKO RW ZHOU J
Citation
K. Abe et al., MEASUREMENT OF THE TAU-NEUTRINO HELICITY AND MICHEL PARAMETERS IN POLARIZED E(-) COLLISIONS()E(), Physical review letters, 78(25), 1997, pp. 4691-4696
Citations number
25
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
78
Issue
25
Year of publication
1997
Pages
4691 - 4696
Database
ISI
SICI code
0031-9007(1997)78:25<4691:MOTTHA>2.0.ZU;2-N
Abstract
We present a new measurement of the tau neutrino helicity h(nu tau) an d the tau Michel parameters rho, eta, xi, and the product delta xi. Th e analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the tau decay spectra, using the 1993-1995 SLD data sample of 4328 e(+)e(-) --> Z(0) --> tau (+)tau(-) events. From the decays tau --> pi nu(tau) and tau --> rho n u(tau) we obtain a combined value h(nu tau) = -0.93 +/- 0.10 +/- 0.04. The leptonic decay channels yield combined values of rho = 0.72 +/- 0 .09 +/- 0.03, xi = 1.05 +/- 0.35 +/- 0.04, and delta xi = 0.88 +/- 0.2 7 +/- 0.04.