The lifetimes of charged and neutral B hadrons have been measured using data collected by the DELPHI experiment at LEP between 1991 and 1993, B hadrons are tagged as jets with a secondary vertex and the charge of the B candidate is taken to be the sum of the charges of the particles in the secondary vertex. Approximately 1,434,000 multihadronic Z(0) decays yielded 1817 B hadron candidates. The B purity was estimated to be around 99.1 +/- 0.3%, and 83% (70%) of the events measured as neutral (charged) came from neutral (charged) B's, The mean lifetimes of charged and neutral B hadrons were found to be 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and 1.58 +/- 0.11 (stat.) +/- 0.09 (syst.) ps respectively. The ratio of their lifetimes, tau((charged))/tau((neutral)), was 1.09(-0.10)(+0.11) (stat.)+/-0.08 (syst.). By making assumptions about the B-s(0) and Lambda(b)(0) states, the B+ and B-0 meson life-times were determined to be tau(B)+ = 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and tau(B)0 = 1.63 +/- 0.14 (stat.) +/- 0.13 (syst.) ps and the ratio of their lifetimes was: tau(B)+/tau(B)0 = 1.06(-0.11)(+0.13) +/- 0.10. The mean B lifetime was also deduced to be <tau(B)> = 1.64 +/- 0.06 (stat.) +/- 0.04 (syst.) ps.



Titolo: LIFETIME OF CHARGED AND NEUTRAL B-HADRONS USING EVENT TOPOLOGY
Autori: 
DE LOTTO, Barbara
SCURI, Fabrizio
mostra contributor esterni 
Data di pubblicazione: 1995
Rivista: 
ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS  
Citazione: LIFETIME OF CHARGED AND NEUTRAL B-HADRONS USING EVENT TOPOLOGY / ADAM W; ADYE T; AGASI E; AJINENKO I; ALEKSAN R; ALEKSEEV GD; ALLPORT PP; ALMEHED S; ALVSVAAG SJ; AMALDI U; AMATO S; ANDREAZZA A; ANDRIEUX ML; ANTILOGUS P; ANYKEYEV V; APEL WD; ARNOUD Y; ASMAN B; AUGUSTIN JE; AUGUSTINUS A; BAILLON P; BAMBADE P; BARAO F; BARATE R; BARDIN DY; BARKER GJ; BARONCELLI A; BARRING O; BARRIO JA; BARTL W; BATES MJ; BATTAGLIA M; BAUBILLIER M; BAUDOT J; BECKS KH; BEGALLI M; BEILLIERE P; BELOKOPYTOV Y; BENVENUTI AC; BERGGREN M; BERTRAND D; BIANCHI F; BIGI M; BILENKY MS; BILLOIR P; BLOCH D; BLUME M; BLYTH S; BOCCI V; BOLOGNESE T; BONESINI M; BONIVENTO W; BOOTH PSL; BORISOV G; BOSIO C; BOSWORTH S; BOTNER O; BOUQUET B; BOURDARIOS C; BOWCOCK TJV; BOZZO M; BRANCHINI P; BRAND KD; BRENNER RA; BRICMAN C; BRILLAULT L; BROWN RCA; BRUCKMAN P; BRUNET JM; BUGGE L; BURAN T; BUYS A; CACCIA M; CALVI M; ROZAS AJC; CAMPORESI T; CANALE V; CANEPA M; CANKOCAK K; CAO F; CARENA F; CARRILHO P; CARROLL L; CASO C; GIMENEZ MVC; CATTAI A; CAVALLO FR; CERRITO L; CHABAUD V; CHARPENTIER P; CHAUSSARD L; CHAUVEAU J; CHECCHIA P; CHELKOV GA; CHIERICI R; CHLIAPNIKOV P; CHOCHULA P; CHOROWICZ V; CINDRO V; COLLINS P; CONTRERAS JL; CONTRI R; CORTINA E; COSME G; COSSUTTI F; CRAWLEY HB; CRENNELL D; CROSETTI G; MAESTRO JC; CZELLAR S; DAHLJENSEN E; DAHM J; DALMAGNE B; DAM M; DAMGAARD G; DAUM A; DAUNCEY PD; DAVENPORT M; DASILVA W; DEFOIX C; DELLARICCA G; DELPIERRE P; DEMARIA N; DEANGELIS A; DEBOECK H; DEBOER W; DEBRABANDERE S; DECLERCQ C; DELAVAISSIERE C; DELOTTO B; DEMIN A; DEPAULA L; DESAINTJEAN C; DIJKSTRA H; DICIACCIO L; DJAMA F; DOLBEAU J; DONSZELMANN M; DOROBA K; DRACOS M; DREES J; DREES KA; DRIS M; DUFOUR Y; DUPONT F; EDSALL D; EHRET R; EIGEN G; EKELOF T; EKSPONG G; ELSING M; ENGEL JP; ERSHAIDAT N; ERZEN B; SANTO ME; FALK E; FASSOULIOTIS D; FEINDT M; FERRER A; FILIPPAS TA; FIRESTONE A; FISCHER PA; FOETH H; FOKITIS E; FONTANELLI F; FORMENTI F; FRANEK B; FRENKIEL P; FRIES DC; FRODESEN AG; FRUHWIRTH R; FULDAQUENZER F; FURSTENAU H; FUSTER J; GALLONI A; GAMBA D; GANDELMAN M; GARCIA C; GARCIA J; GASPAR C; GASPARINI U; GAVILLET P; GAZIS EN; GELE D; GERBER JP; GIBBS M; GILLESPIE D; GOKIELI R; GOLOB B; GOPAL G; GORN L; GORSKI M; GOUZ Y; GRACCO V; GRAZIANI E; GROSDIDIER G; GUNNARSSON P; GUNTHER M; GUY J; HAEDINGER U; HAHN F; HAHN M; HAHN S; HAJDUK Z; HALLGREN A; HAMACHER K; HAO W; HARRIS FJ; HEDBERG V; HENRIQUES R; HERNANDEZ JJ; HERQUET P; HERR H; HESSING TL; HIGON E; HILKE HJ; HILL TS; HOLMGREN SO; HOLT PJ; HOLTHUIZEN D; HOULDEN M; HRUBEC J; HUET K; HULTQVIST K; IOANNOU P; JACKSON JN; JACOBSSON R; JALOCHA P; JANIK R; JARLSKOG G; JARRY P; JEANMARIE B; JOHANSSON EK; JONSSON L; JONSSON P; JORAM C; JUILLOT P; KAISER M; KALMUS G; KAPUSTA F; KARLSSON M; KARVELAS E; KATSANEVAS S; KATSOUFIS EC; KERANEN R; KHOMENKO BA; KHOVANSKI NN; KING B; KJAER NJ; KLEIN H; KLOVNING A; KLUIT P; KOEHNE JH; KOENE B; KOKKINIAS P; KORATZINOS M; KORCYL K; KOSTIOUKHINE V; KOURKOUMELIS C; KOUZNETSOV O; KRAMER PH; KRAMMER M; KREUTER C; KROLIKOWSKI J; KRONKVIST I; KRUMSTEIN Z; KRUPINSKI W; KUBINEC P; KUCEWICZ W; KURVINEN K; LACASTA C; LAKTINEH I; LAMBLOT S; LAMSA JW; LANCERI L; LANE DW; LANGEFELD P; LAPIN V; LAST I; LAUGIER JP; LAUHAKANGAS R; LEDER G; LEDROIT F; LEFEBURE V; LEGAN CK; LEITNER R; LEMOIGNE Y; LEMONNE J; LENZEN G; LEPELTIER V; LESIAK T; LIKO D; LINDNER R; LIPNIACKA A; LIPPI I; LOERSTAD B; LOKAJICEK M; LOKEN JG; LOPEZFERNANDEZ A; AGUERA MAL; LOUKAS D; LUTZ P; LYONS L; MACNAUGHTON J; MAEHLUM G; MAIO A; MALYCHEV V; MANDL F; MARCO J; MARECHAL B; MARGONI M; MARIN JC; MARIOTTI C; MARKOU A; MARON T; MARTINEZVIDAL F; GARCIA SMI; MATORRAS F; MATTEUZZI C; MATTHIAE G; MAZZUCATO M; MCCUBBIN M; MCKAY R; MCNULTY R; MEDBO J; MERONI C; MEYER WT; MICHELOTTO M; MIGLIORE E; MIRABITO L; MITAROFF WA; MJOERNMARK U; MOA T; MOELLER R; MOENIG K; MONGE MR; MORETTINI P; MUELLER H; MUNDIM LM; MURRAY WJ; MURYN B; MYATT G; NARAGHI F; NAVARRIA FL; NAVAS S; NEGRI P; NEMECEK S; NEUMANN W; NEUMEISTER N; NICOLAIDOU R; NIELSEN BS; NIEUWENHUIZEN M; NIKOLAENKO V; NISS P; NOMEROTSKI A; NORMAND A; OBERSCHULTEBECKMANN W; OBRAZTSOV V; OLSHEVSKI AG; ONOFRE A; ORAVA R; OSTERBERG K; OURAOU A; PAGANINI P; PAGANONI M; PAGES P; PALKA H; PAPADOPOULOU TD; PAPE L; PARKES C; PARODI F; PASSERI A; PEGORARO M; PERALTA L; PERNEGGER H; PERNICKA M; PERROTTA A; PETRIDOU C; PETROLINI A; PHILIPS HT; PIANA G; PIERRE F; PIMENTA M; PLASZCZYNSKI S; PODOBRIN O; POL ME; POLOK G; POROPAT P; POZDNIAKOV V; PREST M; PRIVITERA P; PUKHAEVA N; PULLIA A; RADOJICIC D; RAGAZZI S; RAHMANI H; RAMES J; RATOFF PN; READ AL; REALE M; REBECCHI P; REDAELLI NG; REGLER M; REID D; RENTON PB; RESVANIS LK; RICHARD F; RICHARDSON J; RIDKY J; RINAUDO G; RIPP I; ROMERO A; RONCAGLIOLO I; RONCHESE P; ROOS L; ROSENBERG EI; ROSSO E; ROUDEAU P; ROVELLI T; RUCKSTUHL W; RUHLMANNKLEIDER V; RUIZ A; SAARIKKO H; SACQUIN Y; SADOVSKY A; SAJOT G; SALT J; SANCHEZ J; SANNINO M; SCHNEIDER H; SCHYNS MAE; SCIOLLA G; SCURI F; SEDYKH Y; SEGAR AM; SEITZ A; SEKULIN R; SHELLARD RC; SICCAMA I; SIEGRIST P; SIMONETTI S; SIMONETTO F; SISAKIAN AN; SITAR B; SKAALI TB; SMADJA G; SMIRNOV N; SMIRNOVA O; SMITH GR; SOSNOWSKI R; SOUZASANTOS D; SPASSOV T; SPIRITI E; SQUARCIA S; STAECK H; STANESCU C; STAPNES S; STAVITSKI I; STEPANIAK K; STICHELBAUT F; STOCCHI A; STRUB R; STUGU B; SZCZEKOWSKI M; SZEPTYCKA M; TABARELLI T; TAVERNET JP; TCHIKILEV O; TILQUIN A; TIMMERMANS J; TKATCHEV LG; TODOROV T; TOET DZ; TOMARADZE A; TOME B; TORTORA L; TRANSTROMER G; TREILLE D; TRISCHUK W; TRISTRAM G; TROMBINI A; TRONCON C; TSIROU A; TURLUER ML; TYAPKIN IA; TYNDEL M; TZAMARIAS S; UEBERSCHAER B; UEBERSCHAER S; ULLALAND O; UVAROV V; VALENTI G; VALLAZZA E; VELDE CV; VANAPELDOORN GW; VANDAM P; VANDONINCK WK; VANELDIK J; VASSILOPOULOS N; VEGNI G; VENTURA L; VENUS W; VERBEURE F; VERLATO M; VERTOGRADOV LS; VILANOVA D; VINCENT P; VITALE L; VLASOV E; VODOPYANOV AS; VRBA V; WAHLEN H; WALCK C; WALDNER F; WEHR A; WEIERSTALL M; WEILHAMMER P; WETHERELL AM; WICKE D; WICKENS JH; WIELERS M; WILKINSON GR; WILLIAMS WSC; WINTER M; WITEK M; WOSCHNAGG K; YIP K; YUSHCHENKO O; ZACH F; ZACHARATOU C; ZAITSEV A; ZALEWSKA A; ZALEWSKI P; ZAVRTANIK D; ZEVGOLATAKOS E; ZHIGUNOV V; ZIMIN NI; ZITO M; ZONTAR D; ZUBERI R; ZUCCHELLI GC; ZUMERLE G. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - 68:3(1995), pp. 363-374.
Abstract: The lifetimes of charged and neutral B hadrons have been measured using data collected by the DELPHI experiment at LEP between 1991 and 1993, B hadrons are tagged as jets with a secondary vertex and the charge of the B candidate is taken to be the sum of the charges of the particles in the secondary vertex. Approximately 1,434,000 multihadronic Z(0) decays yielded 1817 B hadron candidates. The B purity was estimated to be around 99.1 +/- 0.3%, and 83% (70%) of the events measured as neutral (charged) came from neutral (charged) B's, The mean lifetimes of charged and neutral B hadrons were found to be 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and 1.58 +/- 0.11 (stat.) +/- 0.09 (syst.) ps respectively. The ratio of their lifetimes, tau((charged))/tau((neutral)), was 1.09(-0.10)(+0.11) (stat.)+/-0.08 (syst.). By making assumptions about the B-s(0) and Lambda(b)(0) states, the B+ and B-0 meson life-times were determined to be tau(B)+ = 1.72 +/- 0.08 (stat.) +/- 0.06 (syst.) ps and tau(B)0 = 1.63 +/- 0.14 (stat.) +/- 0.13 (syst.) ps and the ratio of their lifetimes was: tau(B)+/tau(B)0 = 1.06(-0.11)(+0.13) +/- 0.10. The mean B lifetime was also deduced to be <tau(B)> = 1.64 +/- 0.06 (stat.) +/- 0.04 (syst.) ps.
Handle: http://hdl.handle.net/11390/883915
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