A MEASUREMENT OF R-B USING A LIFETIME-MASS TAG

Authors
BARATE R BUSKULIC D DECAMP D GHEZ P GOY C LEES JP LUCOTTE A MINARD MN NIEF JY PIETRZYK B CASADO MP CHMEISSANI M COMAS P CRESPO JM DELFINO M FERNANDEZ E FERNANDEZBOSMAN M GARRIDO L JUSTE A MARTINEZ M MIQUEL R MIR LM ORTEU S PADILLA C PARK IC PASCUAL A PERLAS JA RIU I SANCHEZ F TEUBERT F COLALEO A CREANZA D DEPALMA M GELAO G IASELLI G MAGGI G MAGGI M MARINELLI N NUZZO S RANIERI A RASO G RUGGIERI F SELVAGGI G SILVESTRIS L TEMPESTA P TRICOMI A ZITO G HUANG X LIN J OUYANG Q WANG T XIE Y XU R XUE S ZHANG J ZHANG L ZHAO W ABBANEO D ALEMANY R BECKER U BAZARKO AO BRIGHTTHOMAS P CATTANEO M CERUTTI F DREVERMANN H FORTY RW FRANK M HAGELBERG R HARVEY J JANOT P JOST B KNERINGER E KNOBLOCH J LEHRAUS I LUTTERS G MATO P MINTEN A MONETA L PACHECO A PUSZTASZERI JF RANJARD F RENSING P RIZZO G ROLANDI L SCHLATTER D SCHMITT M SCHNEIDER O TEJESSY W TOMALIN IR WACHSMUTH H WAGNER A AJALTOUNI Z BARRES A BOYER C FALVARD A FERDI C GAY P GUICHENEY C HENRARD P JOUSSET J MICHEL B MONTEIL S MONTRET JC PALLIN D PERRET P PODLYSKI F PRORIOL J ROSNET P ROSSIGNOL JM FEARNLEY T HANSEN JB HANSEN JD HANSEN JR HANSEN PH NILSSON BS RENSCH B WAANANEN A DASKALAKIS G KYRIAKIS A MARKOU C SIMOPOULOU E SIOTIS I VAYAKI A BLONDEL A BONNEAUD G BRIENT JC BOURDON P ROUGE A RUMPF M VALASSI A VERDERI M VIDEAU H CANDLIN DJ PARSONS MI FOCARDI E PARRINI G ZACHARIADOU K CORDEN M GEORGIOPOULOS C JAFFE DE ANTONELLI A BENCIVENNI G BOLOGNA G BOSSI F CAMPANA P CAPON G CASPER D CHIARELLA V FELICI G LAURELLI P MANNOCCHI G MURTAS F MURTAS GP PASSALACQUA L PEPEALTARELLI M CURTIS L DORRIS SJ HALLEY AW KNOWLES IG LYNCH JG OSHEA V RAINE C SCARR JM SMITH K TEIXEIRADIAS P THOMPSON AS THOMSON E THOMSON F TURNBULL RM GEWENIGER C GRAEFE G HANKE P HANSPER G HEPP V KLUGE EE PUTZER A SCHMIDT M SOMMER J TITTEL K WERNER S WUNSCH M BEUSELINCK R BINNIE DM CAMERON W DORNAN PJ GIRONE M GOODSIR S MARTIN EB MOUTOUSSI A NASH J SEDGBEER JK STACEY AM WILLIAMS MD DISSERTORI G GHETE VM GIRTLER P KUHN D RUDOLPH G BETTERIDGE AP BOWDERY CK COLRAIN P CRAWFORD G FINCH AJ FOSTER F HUGHES G SLOAN T WILLIAMS MI GALLA A GIEHL I GREENE AM HOFFMANN C JAKOBS K KLEINKNECHT K QUAST G RENK B ROHNE E SANDER HG VANGEMMEREN P ZEITNITZ C AUBERT JJ BENCHOUK C BONISSENT A BUJOSA G CALVET D CARR J COYLE P DIACONU C ETIENNE F KONSTANTINIDIS N LEROY O MOTSCH F PAYRE P ROUSSEAU D TALBY M SADOUKI A THULASIDAS M TRABELSI K ALEPPO M RAGUSA F BERLICH R BLUM W BROWN D BUSCHER V DIETL H DYDAK F GANIS G GOTZHEIN C KROHA H LUTJENS G LUTZ G MANNER W MOSER HG RICHTER R ROSADOSCHLOSSER A SCHAEL S SETTLES R SEYWERD H STDENIS R STENZEL H WIEDENMANN W WOLF G BOUCROT J CALLOT O CHEN S CHOI Y CORDIER A DAVIER M DUFLOT L GRIVAZ JF HEUSSE P HOCKER A JACHOLKOWSKA J JACQUET M KIM DW LEDIBERDER F LEFRANCOIS J LUTZ AM NIKOLIC I SCHUNE MH SIMION S TOURNEFIER E VEILLET JJ VIDEAU I ZERWAS D AZZURRI P BAGLIESI G BATIGNANI G BETTARINI S BOZZI C CALDERINI G CARPINELLI M CIOCCI MA CIULLI V DELLORSO R FANTECHI R FERRANTE I FOA L FORTI F GIASSI A GIORGI MA GREGORIO A LIGABUE F LUSIANI A MARROCCHESI PS MESSINEO A PALLA F SANGUINETTI G SCIABA A SPAGNOLO P STEINBERGER J TENCHINI R TONELLI G VANNINI C VENTURI A VERDINI PG BLAIR GA BRYANT LM CHAMBERS JT GAO Y GREEN MG MEDCALF T PERRODO P STRONG JA VONWIMMERSPERGTOELLER JH BOTTERILL DR CLIFFT RW EDGECOCK TR HAYWOOD S MALEY P NORTON PR THOMPSON JC WRIGHT AE BLOCHDEVAUX B COLAS P EMERY S KOZANECKI W LANCON E LEMAIRE MC LOCCI E PEREZ P RANDER J RENARDY JF ROUSSARIE A SCHULLER JP SCHWINDLING J TRABELSI A VALLAGE B BLACK SN DANN JH JOHNSON RP KIM HY LITKE AM MCNEIL MA TAYLOR G BOOTH CN BOSWELL R BREW CAJ CARTWRIGHT S COMBLEY F KELLY MS LEHTO M NEWTON WM REEVE J THOMPSON LF BOHRER A BRANDT S COWAN G GRUPEN C SARAIVA P SMOLIK L STEPHAN F APOLLONIO M BOSISIO L DELLAMARINA R GIANNINI G GOBBO B MUSOLINO G ROTHBERG J WASSERBAECH S ARMSTRONG SR CHARLES E ELMER P FERGUSON DPS GAO YS GONZALEZ S GREENING TC HAYES OJ HU H JIN S MCNAMARA PA NACHTMAN JM NIELSEN J OREJUDOS W PAN YB SAADI Y SCOTT IJ WALSH J WU SL WU X YAMARTINO JM ZOBERNIG G
Citation
R. Barate et al., A MEASUREMENT OF R-B USING A LIFETIME-MASS TAG, Physics letters. Section B, 401(1-2), 1997, pp. 150-162
Citations number
18
Categorie Soggetti
Physics
Journal title
Physics letters. Section B → ACNP
ISSN journal
03702693
Volume
401
Issue
1-2
Year of publication
1997
Pages
150 - 162
Database
ISI
SICI code
0370-2693(1997)401:1-2<150:AMORUA>2.0.ZU;2-U
Abstract
ALEPH's published measurement of R-b = Gamma(Z --> b (b) over bar)/Gam ma(Z --> hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding sy stematic effects. Charm background is better controlled by combining t he lifetime tag with a tag based on the b/c hadron mass difference. Fu rthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres o f an event. The value of R-b is measured to be 0.2167 +/- 0.0011(stat) +/- 0.0013(syst). (C) 1997 Published by Elsevier Science B.V.