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We present a measurement of the average b-hadron lifetime tau(b) at the e(+)e(-) collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of tau(b) using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is tau(b) = [1549 +/- 9 (stat) +/- 15 (syst)] fs. In addition, we measure the average charged b-decay multiplicity [n(b)] and the normalized average b-energy [x(E)](b) at LEP to be [n(b)] = 4.90 +/- 0.04 (stat) +/- 0.11 (syst), [x(E)](b) = 0.709 +/- 0.004 (stat + syst). (C) 1998 Published by Elsevier Science B.V.

Measurement of the average lifetime of b-hadrons in Z decays / Acciarri, M; Adriani, O; AGUILAR BENITEZ, M; Ahlen, S; Alcaraz, J; Alemanni, G; Allaby, J; Aloisio, A; Alverson, G; Alviggi, Mg; Ambrosi, G; Anderhub, H; Andreev, Vp; Angelescu, T; Anselmo, F; Arefiev, A; Azemoon, T; Aziz, T; Bagnaia, Paolo; Baksay, L; Ball, Rc; Banerjee, S; Banerjee, S; Banicz, K; Barczyk, A; Barillere, R; Becattini, F; Becker, U; Behner, F; Berdugo, J; Berges, P; Bertucci, B; Betev, Bl; Bhattacharya, S; Biasini, M; Biland, A; Bilei, Gm; Blaising, Jj; Blyth, Sc; Bobbink, Gj; Bock, R; Bohm, A; Boldizsar, L; Borgia, B; Bourilkov, D; Bourquin, M; Boutigny, D; Braccini, S; Branson, Jg; Brigljevic, V; Brock, Ic; Buffini, A; Buijs, A; Burger, Jd; Burger, Wj; Busenitz, J; Cai, Xd; Campanelli, M; Capell, M; Romeo, Gc; Carlino, G; Cartacci, Am; Casaus, J; Castellini, G; Cavallari, F; Cavallo, N; Cecchi, C; Cerrada, M; Cesaroni, F; Chamizo, M; Chang, Yh; Chaturvedi, Uk; Chekanov, Sv; Chemarin, M; Chen, A; Chen, G; Chen, Gm; Chen, Hf; Chen, Hs; Chen, M; Chiefari, G; Chien, Cy; Cifarelli, L; Cindolo, F; Civinini, C; Clare, I; Clare, R; Cohn, Ho; Coignet, G; Colijn, Ap; Colino, N; Costantini, S; Cotorobai, F; DE LA CRUZ, B; Csilling, A; Dai, Ts; D'Alessandro, R; DE ASMUNDIS, R; Degre, A; Deiters, K; Denes, P; Denotaristefani, F; Dibitonto, D; Diemoz, M; VAN DIERENDONCK, D; DI LODOVICO, F; Dionisi, C; Dittmar, M; Dominguez, A; Doria, A; Dova, Mt; Drago, E; Duchesneau, D; Duinker, P; Duran, I; Dutta, S; Easo, S; Efremenko, Y; EL MAMOUNI, H; Engler, A; Eppling, Fj; Erne, Fc; Ernenwein, Jp; Extermann, P; Fabre, M; Faccini, R; Falciano, S; Favara, A; Fay, J; Fedin, O; Felcini, M; Fenyi, B; Ferguson, T; Fernandez, D; Ferroni, Fernando; Fesefeldt, H; Fiandrini, E; Field, Jh; Filthaut, F; Fisher, Ph; Fisk, I; Forconi, G; Fredj, L; Freudenreich, K; Furetta, C; Galaktionov, Y; Ganguli, Sn; GARCIA ABIA, P; Gau, Ss; Gentile, Simonetta; Gerald, J; Gheordanescu, N; Giagu, Stefano; Goldfarb, S; Goldstein, J; Gong, Zf; Gougas, A; Gratta, G; Gruenewald, Mw; Gupta, Vk; Gurtu, A; Gutay, Lj; Hartmann, B; Hasan, A; Hatzifotiadou, D; Hebbeker, T; Herve, A; VAN HOEK, Wc; Hofer, H; Hong, Sj; Hoorani, H; Hou, Sr; Hu, G; Innocente, V; Jenkes, K; Jin, Bn; Jones, Lw; DE JONG, P; JOSA MUTUBERRIA, I; Kasser, A; Khan, Ra; Kamrad, D; Kamyshkov, Y; Kapustinsky, Js; Karyotakis, Y; Kaur, M; KIENZLE FOCACCI, Mn; Kim, D; Kim, Dh; Kim, Jk; Kim, Sc; Kim, Yg; Kinnison, Ww; Kirkby, A; Kirkby, D; Kirkby, J; Kiss, D; Kittel, W; Klimentov, A; Konig, Ac; Kopp, A; Korolko, I; Koutsenko, V; Kraemer, Rw; Krenz, W; Kunin, A; Lacentre, P; DE GUEVARA, Pl; Landi, G; Lapoint, C; LASSILA PERINI, K; Laurikainen, P; Lebeau, M; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; LE COULTRE, P; Lee, Hj; Leggett, C; LE GOFF, Jm; Leiste, R; Leonardi, E; Levtchenko, P; Li, C; Lin, Ch; Lin, Wt; Linde, Fl; Lista, L; Liu, Za; Lohmann, W; Longo, E; Lu, W; Lu, Ys; Lubelsmeyer, K; Luci, Claudio; Luckey, D; Luminari, L; Lustermann, W; Ma, Wg; Maity, M; Majumder, G; Malgeri, L; Malinin, A; Mana, C; Mangeol, D; Mangla, S; Marchesini, P; Marin, A; Martin, Jp; Marzano, F; Massaro, Ggg; Mcnally, D; Mele, S; Merola, L; Meschini, M; Metzger, Wj; VON DER MEY, M; Mi, Y; Mihul, A; VAN MIL, Ajw; Milcent, H; Mirabelli, G; Mnich, J; Molnar, P; Monteleoni, B; Moore, R; Morganti, S; Moulik, T; Mount, R; Muheim, F; Muijs, Ajm; Nahn, S; Napolitano, M; NESSI TEDALDI, F; Newman, H; Niessen, T; Nippe, A; Nisati, A; Nowak, H; Oh, Yd; Opitz, H; Organtini, G; Ostonen, R; Palomares, C; Pandoulas, D; Paoletti, S; Paolucci, P; Park, Hk; Park, Ih; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, F; Peach, D; Pei, Yj; Pensotti, S; PERRET GALLIX, D; Petersen, B; Petrak, S; Pevsner, A; Piccolo, D; Pieri, M; Piroue, Pa; Pistolesi, E; Plyaskin, V; Pohl, M; Pojidaev, V; Postema, H; Produit, N; Prokofiev, D; RAHAL CALLOT, G; Raja, N; Rancoita, Pg; Rattaggi, M; Raven, G; Razis, P; Read, K; Ren, D; Rescigno, M; Reucroft, S; VAN RHEE, T; Riemann, S; Riles, K; Rind, O; Robohm, A; Rodin, J; Roe, Bp; Romero, L; ROSIER LEES, S; Rosselet, P; VAN ROSSUM, W; Roth, S; Rubio, Ja; Ruschmeier, D; Rykaczewski, H; Salicio, J; Sanchez, E; Sanders, Mp; Sarakinos, Me; Sarkar, S; Sauvage, G; Schafer, C; Schegelsky, V; SCHMIDT KAERST, S; Schmitz, D; Schneegans, M; Scholz, N; Schopper, H; Schotanus, Dj; Schwenke, J; Schwering, G; Sciacca, C; Sciarrino, D; Servoli, L; Shevchenko, S; Shivarov, N; Shoutko, V; Shukla, J; Shumilov, E; Shvorob, A; Siedenburg, T; Son, D; Soulimov, V; Smith, B; Spillantini, P; Steuer, M; Stickland, Dp; Stone, H; Stoyanov, B; Straessner, A; Strauch, K; Sudhakar, K; Sultanov, G; Sun, Lz; Susinno, Gf; Suter, H; Swain, Jd; Tang, Xw; Tauscher, L; Taylor, L; Ting, Scc; Ting, Sm; Tonwar, Sc; Toth, J; Tully, C; Tuchscherer, H; Tung, Kl; Uchida, Y; Ulbricht, J; Uwer, U; Valente, E; VAN DE WALLE, Rt; Vesztergombi, G; Vetlitsky, I; Viertel, G; Vivargent, M; Volkert, R; Vogel, H; Vogt, H; Vorobiev, I; Vorobyov, Aa; Vorvolakos, A; Wadhwa, M; Wallraff, W; Wang, Jc; Wang, Xl; Wang, Zm; Weber, A; Wu, Sx; Wynhoff, S; Xu, J; Xu, Zz; Yang, Bz; Yang, Cg; Yao, Xy; Ye, Jb; Yeh, Sc; You, Jm; Zalite, A; Zalite, Y; Zemp, P; Zeng, Y; Zhang, Z; Zhang, Zp; Zhou, B; Zhou, Y; Zhu, Gy; Zhu, Ry; Zichichi, A; Ziegler, F.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 416:(1998), pp. 220-232. [10.1016/S0370-2693(97)01379-8]

Measurement of the average lifetime of b-hadrons in Z decays

BAGNAIA, Paolo;FERRONI, Fernando;GENTILE, Simonetta;GIAGU, Stefano;LUCI, Claudio;ORGANTINI G;
1998

Abstract

We present a measurement of the average b-hadron lifetime tau(b) at the e(+)e(-) collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of tau(b) using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is tau(b) = [1549 +/- 9 (stat) +/- 15 (syst)] fs. In addition, we measure the average charged b-decay multiplicity [n(b)] and the normalized average b-energy [x(E)](b) at LEP to be [n(b)] = 4.90 +/- 0.04 (stat) +/- 0.11 (syst), [x(E)](b) = 0.709 +/- 0.004 (stat + syst). (C) 1998 Published by Elsevier Science B.V.
1998
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of the average lifetime of b-hadrons in Z decays / Acciarri, M; Adriani, O; AGUILAR BENITEZ, M; Ahlen, S; Alcaraz, J; Alemanni, G; Allaby, J; Aloisio, A; Alverson, G; Alviggi, Mg; Ambrosi, G; Anderhub, H; Andreev, Vp; Angelescu, T; Anselmo, F; Arefiev, A; Azemoon, T; Aziz, T; Bagnaia, Paolo; Baksay, L; Ball, Rc; Banerjee, S; Banerjee, S; Banicz, K; Barczyk, A; Barillere, R; Becattini, F; Becker, U; Behner, F; Berdugo, J; Berges, P; Bertucci, B; Betev, Bl; Bhattacharya, S; Biasini, M; Biland, A; Bilei, Gm; Blaising, Jj; Blyth, Sc; Bobbink, Gj; Bock, R; Bohm, A; Boldizsar, L; Borgia, B; Bourilkov, D; Bourquin, M; Boutigny, D; Braccini, S; Branson, Jg; Brigljevic, V; Brock, Ic; Buffini, A; Buijs, A; Burger, Jd; Burger, Wj; Busenitz, J; Cai, Xd; Campanelli, M; Capell, M; Romeo, Gc; Carlino, G; Cartacci, Am; Casaus, J; Castellini, G; Cavallari, F; Cavallo, N; Cecchi, C; Cerrada, M; Cesaroni, F; Chamizo, M; Chang, Yh; Chaturvedi, Uk; Chekanov, Sv; Chemarin, M; Chen, A; Chen, G; Chen, Gm; Chen, Hf; Chen, Hs; Chen, M; Chiefari, G; Chien, Cy; Cifarelli, L; Cindolo, F; Civinini, C; Clare, I; Clare, R; Cohn, Ho; Coignet, G; Colijn, Ap; Colino, N; Costantini, S; Cotorobai, F; DE LA CRUZ, B; Csilling, A; Dai, Ts; D'Alessandro, R; DE ASMUNDIS, R; Degre, A; Deiters, K; Denes, P; Denotaristefani, F; Dibitonto, D; Diemoz, M; VAN DIERENDONCK, D; DI LODOVICO, F; Dionisi, C; Dittmar, M; Dominguez, A; Doria, A; Dova, Mt; Drago, E; Duchesneau, D; Duinker, P; Duran, I; Dutta, S; Easo, S; Efremenko, Y; EL MAMOUNI, H; Engler, A; Eppling, Fj; Erne, Fc; Ernenwein, Jp; Extermann, P; Fabre, M; Faccini, R; Falciano, S; Favara, A; Fay, J; Fedin, O; Felcini, M; Fenyi, B; Ferguson, T; Fernandez, D; Ferroni, Fernando; Fesefeldt, H; Fiandrini, E; Field, Jh; Filthaut, F; Fisher, Ph; Fisk, I; Forconi, G; Fredj, L; Freudenreich, K; Furetta, C; Galaktionov, Y; Ganguli, Sn; GARCIA ABIA, P; Gau, Ss; Gentile, Simonetta; Gerald, J; Gheordanescu, N; Giagu, Stefano; Goldfarb, S; Goldstein, J; Gong, Zf; Gougas, A; Gratta, G; Gruenewald, Mw; Gupta, Vk; Gurtu, A; Gutay, Lj; Hartmann, B; Hasan, A; Hatzifotiadou, D; Hebbeker, T; Herve, A; VAN HOEK, Wc; Hofer, H; Hong, Sj; Hoorani, H; Hou, Sr; Hu, G; Innocente, V; Jenkes, K; Jin, Bn; Jones, Lw; DE JONG, P; JOSA MUTUBERRIA, I; Kasser, A; Khan, Ra; Kamrad, D; Kamyshkov, Y; Kapustinsky, Js; Karyotakis, Y; Kaur, M; KIENZLE FOCACCI, Mn; Kim, D; Kim, Dh; Kim, Jk; Kim, Sc; Kim, Yg; Kinnison, Ww; Kirkby, A; Kirkby, D; Kirkby, J; Kiss, D; Kittel, W; Klimentov, A; Konig, Ac; Kopp, A; Korolko, I; Koutsenko, V; Kraemer, Rw; Krenz, W; Kunin, A; Lacentre, P; DE GUEVARA, Pl; Landi, G; Lapoint, C; LASSILA PERINI, K; Laurikainen, P; Lebeau, M; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; LE COULTRE, P; Lee, Hj; Leggett, C; LE GOFF, Jm; Leiste, R; Leonardi, E; Levtchenko, P; Li, C; Lin, Ch; Lin, Wt; Linde, Fl; Lista, L; Liu, Za; Lohmann, W; Longo, E; Lu, W; Lu, Ys; Lubelsmeyer, K; Luci, Claudio; Luckey, D; Luminari, L; Lustermann, W; Ma, Wg; Maity, M; Majumder, G; Malgeri, L; Malinin, A; Mana, C; Mangeol, D; Mangla, S; Marchesini, P; Marin, A; Martin, Jp; Marzano, F; Massaro, Ggg; Mcnally, D; Mele, S; Merola, L; Meschini, M; Metzger, Wj; VON DER MEY, M; Mi, Y; Mihul, A; VAN MIL, Ajw; Milcent, H; Mirabelli, G; Mnich, J; Molnar, P; Monteleoni, B; Moore, R; Morganti, S; Moulik, T; Mount, R; Muheim, F; Muijs, Ajm; Nahn, S; Napolitano, M; NESSI TEDALDI, F; Newman, H; Niessen, T; Nippe, A; Nisati, A; Nowak, H; Oh, Yd; Opitz, H; Organtini, G; Ostonen, R; Palomares, C; Pandoulas, D; Paoletti, S; Paolucci, P; Park, Hk; Park, Ih; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, F; Peach, D; Pei, Yj; Pensotti, S; PERRET GALLIX, D; Petersen, B; Petrak, S; Pevsner, A; Piccolo, D; Pieri, M; Piroue, Pa; Pistolesi, E; Plyaskin, V; Pohl, M; Pojidaev, V; Postema, H; Produit, N; Prokofiev, D; RAHAL CALLOT, G; Raja, N; Rancoita, Pg; Rattaggi, M; Raven, G; Razis, P; Read, K; Ren, D; Rescigno, M; Reucroft, S; VAN RHEE, T; Riemann, S; Riles, K; Rind, O; Robohm, A; Rodin, J; Roe, Bp; Romero, L; ROSIER LEES, S; Rosselet, P; VAN ROSSUM, W; Roth, S; Rubio, Ja; Ruschmeier, D; Rykaczewski, H; Salicio, J; Sanchez, E; Sanders, Mp; Sarakinos, Me; Sarkar, S; Sauvage, G; Schafer, C; Schegelsky, V; SCHMIDT KAERST, S; Schmitz, D; Schneegans, M; Scholz, N; Schopper, H; Schotanus, Dj; Schwenke, J; Schwering, G; Sciacca, C; Sciarrino, D; Servoli, L; Shevchenko, S; Shivarov, N; Shoutko, V; Shukla, J; Shumilov, E; Shvorob, A; Siedenburg, T; Son, D; Soulimov, V; Smith, B; Spillantini, P; Steuer, M; Stickland, Dp; Stone, H; Stoyanov, B; Straessner, A; Strauch, K; Sudhakar, K; Sultanov, G; Sun, Lz; Susinno, Gf; Suter, H; Swain, Jd; Tang, Xw; Tauscher, L; Taylor, L; Ting, Scc; Ting, Sm; Tonwar, Sc; Toth, J; Tully, C; Tuchscherer, H; Tung, Kl; Uchida, Y; Ulbricht, J; Uwer, U; Valente, E; VAN DE WALLE, Rt; Vesztergombi, G; Vetlitsky, I; Viertel, G; Vivargent, M; Volkert, R; Vogel, H; Vogt, H; Vorobiev, I; Vorobyov, Aa; Vorvolakos, A; Wadhwa, M; Wallraff, W; Wang, Jc; Wang, Xl; Wang, Zm; Weber, A; Wu, Sx; Wynhoff, S; Xu, J; Xu, Zz; Yang, Bz; Yang, Cg; Yao, Xy; Ye, Jb; Yeh, Sc; You, Jm; Zalite, A; Zalite, Y; Zemp, P; Zeng, Y; Zhang, Z; Zhang, Zp; Zhou, B; Zhou, Y; Zhu, Gy; Zhu, Ry; Zichichi, A; Ziegler, F.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 416:(1998), pp. 220-232. [10.1016/S0370-2693(97)01379-8]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/241654
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