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; DE LOTTO, Barbara; 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, Fabrizio; 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.

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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:	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 DE LOTTO, Barbara 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, Fabrizio 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. mostra contributor esterni nascondi 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; 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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
Appare nelle tipologie:	1.1 Articolo in rivista

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