Measurement of the b hadron lifetime with the dipole method

Buskulic, D.; Debonis, I.; Decamp, D.; Ghez, P.; Goy, C.; Lees, J.; Minard, M.; Pietrzyk, B.; Ariztizabal, F.; Comas, P.; Crespo, J.; Delfino, M.; Efthymiopoulos, I.; Fernandez, E.; Fernandezbosman, M.; Gaitan, V.; Garrido, L.; Mattison, T.; Pacheco, A.; Padilla, C.; Pascual, A.; Creanza, D.; Depalma, M.; Farilla, A.; Iaselli, G.; Maggi, G.; Marinelli, N.; Natali, S.; Nuzzo, S.; Ranieri, A.; Raso, G.; Romano, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Chai, Y.; Hu, H.; Huang, D.; Huang, X.; Lin, J.; Wang, T.; Xie, Y.; Xu, D.; Xu, R.; Zhang, J.; Zhang, L.; Zhao, W.; Bonvicini, G.; Boudreau, J.; Casper, D.; Drevermann, H.; Forty, R.; Ganis, G.; Gay, C.; Hagelberg, R.; Harvey, J.; Hilgart, J.; Jacobsen, R.; Jost, B.; Knobloch, J.; Lehraus, I.; Maggi, M.; Markou, C.; Martinez, M.; Mato, P.; Meinhard, H.; Minten, A.; Miquel, R.; Moser, H.; Palazzi, P.; Pater, J.; Perlas, J.; Pusztaszeri, J.; Ranjard, F.; Rolandi, L.; Rothberg, J.; Ruan, T.; Saich, M.; Schlatter, D.; Schmelling, M.; Sefkow, F.; Tejessy, W.; Tomalin, I.; Veenhof, R.; Wachsmuth, H.; Wasserbaech, S.; Wiedenmann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Z.; Badaud, F.; Bardadinotwinowska, M.; Elfellous, R.; Falvard, A.; Gay, P.; Guicheney, C.; Henrard, P.; Jousset, J.; Michel, B.; Montret, J.; Pallin, D.; Perret, P.; Podlyski, F.; Proriol, J.; Prulhiere, F.; Saadi, F.; Fearnley, T.; Hansen, J.; Hansen, J.; Hansen, J.; Hansen, P.; Mollerud, R.; Nilsson, B.; Kyriakis, A.; Simopoulou, E.; Siotis, I.; Vayaki, A.; Zachariadou, K.; Badier, J.; Blondel, A.; Bonneaud, G.; Brient, J.; Bourdon, P.; Fouque, G.; Orteu, S.; Rouge, A.; Rumpf, M.; Tanaka, R.; Verderi, M.; Videau, H.; Candlin, D.; Parsons, M.; Veitch, E.; Focardi, E.; Moneta, L.; Parrini, G.; Corden, M.; Georgiopoulos, C.; Ikeda, M.; Levinthal, D.; Antonelli, A.; Baldini, R.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; Dettorrepiazzoli, B.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G.; Passalacqua, L.; Pepealtarelli, M.; Picchi, P.; Colrain, P.; Tenhave, I.; Lynch, J.; Maitland, W.; Morton, W.; Raine, C.; Reeves, P.; Scarr, J.; Smith, K.; Smith, M.; Thompson, A.; Turnbull, R.; Brandl, B.; Braun, O.; Geweniger, C.; Hanke, P.; Hepp, V.; Kluge, E.; Maumary, Y.; Putzer, A.; Rensch, B.; Stahl, A.; Tittel, K.; Wunsch, M.; Beuselinck, R.; Binnie, D.; Cameron, W.; Cattaneo, M.; Colling, D.; Dornan, P.; Greene, A.; Hassard, J.; Lieske, N.; Moutoussi, A.; Nash, J.; Patton, S.; Payne, D.; Phillips, M.; Sanmartin, G.; Sedgbeer, J.; Wright, A.; Girtler, P.; Kuhn, D.; Rudolph, G.; Vogl, R.; Bowdery, C.; Brodbeck, T.; Finch, A.; Foster, F.; Hughes, G.; Jackson, D.; Keemer, N.; Nuttall, M.; Patel, A.; Sloan, T.; Snow, S.; Whelan, E.; Kleinknecht, K.; Raab, J.; Renk, B.; Sander, H.; Schmidt, H.; Walther, S.; Wanke, R.; Wolf, B.; Zimmermann, A.; Bencheikh, A.; Benchouk, C.; Bonissent, A.; Carr, J.; Coyle, P.; Drinkard, J.; Etienne, F.; Nicod, D.; Papalexiou, S.; Payre, P.; Roos, L.; Rousseau, D.; Schwemling, P.; Talby, M.; Adlung, S.; Assmann, R.; Bauer, C.; Blum, W.; Brown, D.; Cattaneo, P.; Dehning, B.; Dietl, H.; Dydak, F.; Frank, M.; Halley, A.; Jakobs, K.; Lauber, J.; Lutjens, G.; Lutz, G.; Manner, W.; Richter, R.; Schroder, J.; Schwarz, A.; Settles, R.; Seywerd, H.; Stierlin, U.; Stiegler, U.; Stdenis, R.; Wolf, G.; Alemany, R.; Boucrot, J.; Callot, O.; Cordier, A.; Davier, M.; Duflot, L.; Grivaz, J.; Heusse, P.; Jaffe, D.; Janot, P.; Kim, D.; Lediberder, F.; Lefrancois, J.; Lutz, A.; Schune, M.; Veillet, J.; Videau, I.; Zhang, Z.; Abbaneo, D.; Bagliesi, G.; Batignani, G.; Bottigli, U.; Bozzi, C.; Calderini, G.; Carpinelli, M.; Ciocci, M.; Ciulli, V.; Dellorso, R.; Ferrante, I.; Fidecaro, F.; Foa, L.; Forti, F.; Giassi, A.; Giorgi, M.; Gregorio, A.; Ligabue, F.; Lusiani, A.; Mannelli, E.; Marrocchesi, P.; Messineo, A.; Palla, F.; Rizzo, G.; Sanguinetti, G.; Spagnolo, P.; Steinberger, J.; Tenchini, R.; Tonelli, G.; Triggiani, G.; Valassi, A.; Vannini, C.; Venturi, A.; Verdini, P.; Walsh, J.; Betteridge, A.; Gao, Y.; Green, M.; March, P.; Mir, L.; Medcalf, T.; Quazi, I.; Strong, J.; West, L.; Botterill, D.; Clifft, R.; Edgecock, T.; Haywood, S.; Norton, P.; Thompson, J.; Blochdevaux, B.; Colas, P.; Duarte, H.; Emery, S.; Kozanecki, W.; Lancon, E.; Lemaire, M.; Locci, E.; Marx, B.; Perez, P.; Rander, J.; Renardy, J.; Rosowsky, A.; Roussarie, A.; Schuller, J.; Schwindling, J.; Mohand, D.; Vallage, B.; Johnson, R.; Litke, A.; Taylor, G.; Wear, J.; Ashman, J.; Babbage, W.; Booth, C.; Buttar, C.; Cartwright, S.; Combley, F.; Dawson, I.; Thompson, L.; Barberio, E.; Bohrer, A.; Brandt, S.; Cowan, G.; Grupen, C.; Lutters, G.; Rivera, F.; Schafer, U.; Smolik, L.; Bosisio, L.; Dellamarina, R.; Giannini, G.; Gobbo, B.; Ragusa, F.; Bellantoni, L.; Chen, W.; Conway, J.; Feng, Z.; Ferguson, D.; Gao, Y.; Grahl, J.; Harton, J.; Hayes, O.; Nachtman, J.; Pan, Y.; Saadi, Y.; Schmitt, M.; Scott, I.; Sharma, V.; Shi, Z.; Turk, J.; Walsh, A.; Weber, F.; Wu, S.; Wu, X.; Zheng, M.; Zobernig, G.

doi:10.1016/0370-2693(93)91265-O

A measurement of the average lifetime of b hadrons has been performed with the dipole method on a sample of 260000 hadronic Z decays recorded with the ALEPH detector during 1991. The dipole is the distance between the vertices built in the opposite hemispheres. The mean dipole is extracted from all the events without attempting b enrichment. Comparing the average of the data dipole distribution with a Monte Carlo calibration curve obtained with different b lifetimes, an average b hadron lifetime of 1.51 +/- 0.08 ps is extracted.

Measurement of the b hadron lifetime with the dipole method / D. Buskulic, I. Debonis, D. Decamp, P. Ghez, C. Goy, J. Lees, M. Minard, B. Pietrzyk, F. Ariztizabal, P. Comas, J. Crespo, M. Delfino, I. Efthymiopoulos, E. Fernandez, M. Fernandezbosman, V. Gaitan, L. Garrido, T. Mattison, A. Pacheco, C. Padilla, A. Pascual, D. Creanza, M. Depalma, A. Farilla, G. Iaselli, G. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Chai, H. Hu, D. Huang, X. Huang, J. Lin, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, J. Boudreau, D. Casper, H. Drevermann, R. Forty, G. Ganis, C. Gay, R. Hagelberg, J. Harvey, J. Hilgart, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, M. Maggi, C. Markou, M. Martinez, P. Mato, H. Meinhard, A. Minten, R. Miquel, H. Moser, P. Palazzi, J. Pater, J. Perlas, J. Pusztaszeri, F. Ranjard, L. Rolandi, J. Rothberg, T. Ruan, M. Saich, D. Schlatter, M. Schmelling, F. Sefkow, W. Tejessy, I. Tomalin, R. Veenhof, H. Wachsmuth, S. Wasserbaech, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, F. Badaud, M. Bardadinotwinowska, R. Elfellous, A. Falvard, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, J. Montret, D. Pallin, P. Perret, F. Podlyski, J. Proriol, F. Prulhiere, F. Saadi, T. Fearnley, J. Hansen, J. Hansen, J. Hansen, P. Hansen, R. Mollerud, B. Nilsson, A. Kyriakis, E. Simopoulou, I. Siotis, A. Vayaki, K. Zachariadou, J. Badier, A. Blondel, G. Bonneaud, J. Brient, P. Bourdon, G. Fouque, S. Orteu, A. Rouge, M. Rumpf, R. Tanaka, M. Verderi, H. Videau, D. Candlin, M. Parsons, E. Veitch, E. Focardi, L. Moneta, G. Parrini, M. Corden, C. Georgiopoulos, M. Ikeda, D. Levinthal, A. Antonelli, R. Baldini, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, F. Cerutti, V. Chiarella, B. Dettorrepiazzoli, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. Murtas, L. Passalacqua, M. Pepealtarelli, P. Picchi, P. Colrain, I. Tenhave, J. Lynch, W. Maitland, W. Morton, C. Raine, P. Reeves, J. Scarr, K. Smith, M. Smith, A. Thompson, R. Turnbull, B. Brandl, O. Braun, C. Geweniger, P. Hanke, V. Hepp, E. Kluge, Y. Maumary, A. Putzer, B. Rensch, A. Stahl, K. Tittel, M. Wunsch, R. Beuselinck, D. Binnie, W. Cameron, M. Cattaneo, D. Colling, P. Dornan, A. Greene, J. Hassard, N. Lieske, A. Moutoussi, J. Nash, S. Patton, D. Payne, M. Phillips, G. Sanmartin, J. Sedgbeer, A. Wright, P. Girtler, D. Kuhn, G. Rudolph, R. Vogl, C. Bowdery, T. Brodbeck, A. Finch, F. Foster, G. Hughes, D. Jackson, N. Keemer, M. Nuttall, A. Patel, T. Sloan, S. Snow, E. Whelan, K. Kleinknecht, J. Raab, B. Renk, H. Sander, H. Schmidt, S. Walther, R. Wanke, B. Wolf, A. Zimmermann, A. Bencheikh, C. Benchouk, A. Bonissent, J. Carr, P. Coyle, J. Drinkard, F. Etienne, D. Nicod, S. Papalexiou, P. Payre, L. Roos, D. Rousseau, P. Schwemling, M. Talby, S. Adlung, R. Assmann, C. Bauer, W. Blum, D. Brown, P. Cattaneo, B. Dehning, H. Dietl, F. Dydak, M. Frank, A. Halley, K. Jakobs, J. Lauber, G. Lutjens, G. Lutz, W. Manner, R. Richter, J. Schroder, A. Schwarz, R. Settles, H. Seywerd, U. Stierlin, U. Stiegler, R. Stdenis, G. Wolf, R. Alemany, J. Boucrot, O. Callot, A. Cordier, M. Davier, L. Duflot, J. Grivaz, P. Heusse, D. Jaffe, P. Janot, D. Kim, F. Lediberder, J. Lefrancois, A. Lutz, M. Schune, J. Veillet, I. Videau, Z. Zhang, D. Abbaneo, G. Bagliesi, G. Batignani, U. Bottigli, C. Bozzi, G. Calderini, M. Carpinelli, M. Ciocci, V. Ciulli, R. Dellorso, I. Ferrante, F. Fidecaro, L. Foa, F. Forti, A. Giassi, M. Giorgi, A. Gregorio, F. Ligabue, A. Lusiani, E. Mannelli, P. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, P. Spagnolo, J. Steinberger, R. Tenchini, G. Tonelli, G. Triggiani, A. Valassi, C. Vannini, A. Venturi, P. Verdini, J. Walsh, A. Betteridge, Y. Gao, M. Green, P. March, L. Mir, T. Medcalf, I. Quazi, J. Strong, L. West, D. Botterill, R. Clifft, T. Edgecock, S. Haywood, P. Norton, J. Thompson, B. Blochdevaux, P. Colas, H. Duarte, S. Emery, W. Kozanecki, E. Lancon, M. Lemaire, E. Locci, B. Marx, P. Perez, J. Rander, J. Renardy, A. Rosowsky, A. Roussarie, J. Schuller, J. Schwindling, D. Mohand, B. Vallage, R. Johnson, A. Litke, G. Taylor, J. Wear, J. Ashman, W. Babbage, C. Booth, C. Buttar, S. Cartwright, F. Combley, I. Dawson, L. Thompson, E. Barberio, A. Bohrer, S. Brandt, G. Cowan, C. Grupen, G. Lutters, F. Rivera, U. Schafer, L. Smolik, L. Bosisio, R. Dellamarina, G. Giannini, B. Gobbo, F. Ragusa, L. Bellantoni, W. Chen, J. Conway, Z. Feng, D. Ferguson, Y. Gao, J. Grahl, J. Harton, O. Hayes, J. Nachtman, Y. Pan, Y. Saadi, M. Schmitt, I. Scott, V. Sharma, Z. Shi, J. Turk, A. Walsh, F. Weber, S. Wu, X. Wu, M. Zheng, G. Zobernig. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 314:3/4(1993), pp. 459-470. [10.1016/0370-2693(93)91265-O]

Measurement of the b hadron lifetime with the dipole method

D. Buskulic;I. Debonis;D. Decamp;P. Ghez;C. Goy;J. Lees;M. Minard;B. Pietrzyk;F. Ariztizabal;P. Comas;J. Crespo;M. Delfino;I. Efthymiopoulos;E. Fernandez;M. Fernandezbosman;V. Gaitan;L. Garrido;T. Mattison;A. Pacheco;C. Padilla;A. Pascual;D. Creanza;M. Depalma;A. Farilla;G. Iaselli;G. Maggi;N. Marinelli;S. Natali;S. Nuzzo;A. Ranieri;G. Raso;F. Romano;F. Ruggieri;G. Selvaggi;L. Silvestris;P. Tempesta;G. Zito;Y. Chai;H. Hu;D. Huang;X. Huang;J. Lin;T. Wang;Y. Xie;D. Xu;R. Xu;J. Zhang;L. Zhang;W. Zhao;G. Bonvicini;J. Boudreau;D. Casper;H. Drevermann;R. Forty;G. Ganis;C. Gay;R. Hagelberg;J. Harvey;J. Hilgart;R. Jacobsen;B. Jost;J. Knobloch;I. Lehraus;M. Maggi;C. Markou;M. Martinez;P. Mato;H. Meinhard;A. Minten;R. Miquel;H. Moser;P. Palazzi;J. Pater;J. Perlas;J. Pusztaszeri;F. Ranjard;L. Rolandi;J. Rothberg;T. Ruan;M. Saich;D. Schlatter;M. Schmelling;F. Sefkow;W. Tejessy;I. Tomalin;R. Veenhof;H. Wachsmuth;S. Wasserbaech;W. Wiedenmann;T. Wildish;W. Witzeling;J. Wotschack;Z. Ajaltouni;F. Badaud;M. Bardadinotwinowska;R. Elfellous;A. Falvard;P. Gay;C. Guicheney;P. Henrard;J. Jousset;B. Michel;J. Montret;D. Pallin;P. Perret;F. Podlyski;J. Proriol;F. Prulhiere;F. Saadi;T. Fearnley;J. Hansen;J. Hansen;J. Hansen;P. Hansen;R. Mollerud;B. Nilsson;A. Kyriakis;E. Simopoulou;I. Siotis;A. Vayaki;K. Zachariadou;J. Badier;A. Blondel;G. Bonneaud;J. Brient;P. Bourdon;G. Fouque;S. Orteu;A. Rouge;M. Rumpf;R. Tanaka;M. Verderi;H. Videau;D. Candlin;M. Parsons;E. Veitch;E. Focardi;L. Moneta;G. Parrini;M. Corden;C. Georgiopoulos;M. Ikeda;D. Levinthal;A. Antonelli;R. Baldini;G. Bencivenni;G. Bologna;F. Bossi;P. Campana;G. Capon;F. Cerutti;V. Chiarella;B. Dettorrepiazzoli;G. Felici;P. Laurelli;G. Mannocchi;F. Murtas;G. Murtas;L. Passalacqua;M. Pepealtarelli;P. Picchi;P. Colrain;I. Tenhave;J. Lynch;W. Maitland;W. Morton;C. Raine;P. Reeves;J. Scarr;K. Smith;M. Smith;A. Thompson;R. Turnbull;B. Brandl;O. Braun;C. Geweniger;P. Hanke;V. Hepp;E. Kluge;Y. Maumary;A. Putzer;B. Rensch;A. Stahl;K. Tittel;M. Wunsch;R. Beuselinck;D. Binnie;W. Cameron;M. Cattaneo;D. Colling;P. Dornan;A. Greene;J. Hassard;N. Lieske;A. Moutoussi;J. Nash;S. Patton;D. Payne;M. Phillips;G. Sanmartin;J. Sedgbeer;A. Wright;P. Girtler;D. Kuhn;G. Rudolph;R. Vogl;C. Bowdery;T. Brodbeck;A. Finch;F. Foster;G. Hughes;D. Jackson;N. Keemer;M. Nuttall;A. Patel;T. Sloan;S. Snow;E. Whelan;K. Kleinknecht;J. Raab;B. Renk;H. Sander;H. Schmidt;S. Walther;R. Wanke;B. Wolf;A. Zimmermann;A. Bencheikh;C. Benchouk;A. Bonissent;J. Carr;P. Coyle;J. Drinkard;F. Etienne;D. Nicod;S. Papalexiou;P. Payre;L. Roos;D. Rousseau;P. Schwemling;M. Talby;S. Adlung;R. Assmann;C. Bauer;W. Blum;D. Brown;P. Cattaneo;B. Dehning;H. Dietl;F. Dydak;M. Frank;A. Halley;K. Jakobs;J. Lauber;G. Lutjens;G. Lutz;W. Manner;R. Richter;J. Schroder;A. Schwarz;R. Settles;H. Seywerd;U. Stierlin;U. Stiegler;R. Stdenis;G. Wolf;R. Alemany;J. Boucrot;O. Callot;A. Cordier;M. Davier;L. Duflot;J. Grivaz;P. Heusse;D. Jaffe;P. Janot;D. Kim;F. Lediberder;J. Lefrancois;A. Lutz;M. Schune;J. Veillet;I. Videau;Z. Zhang;D. Abbaneo;G. Bagliesi;G. Batignani;U. Bottigli;C. Bozzi;G. Calderini;M. Carpinelli;M. Ciocci;V. Ciulli;R. Dellorso;I. Ferrante;F. Fidecaro;L. Foa;F. Forti;A. Giassi;M. Giorgi;A. Gregorio;F. Ligabue;A. Lusiani;E. Mannelli;P. Marrocchesi;A. Messineo;F. Palla;G. Rizzo;G. Sanguinetti;P. Spagnolo;J. Steinberger;R. Tenchini;G. Tonelli;G. Triggiani;A. Valassi;C. Vannini;A. Venturi;P. Verdini;J. Walsh;A. Betteridge;Y. Gao;M. Green;P. March;L. Mir;T. Medcalf;I. Quazi;J. Strong;L. West;D. Botterill;R. Clifft;T. Edgecock;S. Haywood;P. Norton;J. Thompson;B. Blochdevaux;P. Colas;H. Duarte;S. Emery;W. Kozanecki;E. Lancon;M. Lemaire;E. Locci;B. Marx;P. Perez;J. Rander;J. Renardy;A. Rosowsky;A. Roussarie;J. Schuller;J. Schwindling;D. Mohand;B. Vallage;R. Johnson;A. Litke;G. Taylor;J. Wear;J. Ashman;W. Babbage;C. Booth;C. Buttar;S. Cartwright;F. Combley;I. Dawson;L. Thompson;E. Barberio;A. Bohrer;S. Brandt;G. Cowan;C. Grupen;G. Lutters;F. Rivera;U. Schafer;L. Smolik;L. Bosisio;R. Dellamarina;G. Giannini;B. Gobbo;F. Ragusa;L. Bellantoni;W. Chen;J. Conway;Z. Feng;D. Ferguson;Y. Gao;J. Grahl;J. Harton;O. Hayes;J. Nachtman;Y. Pan;Y. Saadi;M. Schmitt;I. Scott;V. Sharma;Z. Shi;J. Turk;A. Walsh;F. Weber;S. Wu;X. Wu;M. Zheng;G. Zobernig

1993

Abstract

A measurement of the average lifetime of b hadrons has been performed with the dipole method on a sample of 260000 hadronic Z decays recorded with the ALEPH detector during 1991. The dipole is the distance between the vertices built in the opposite hemispheres. The mean dipole is extracted from all the events without attempting b enrichment. Comparing the average of the data dipole distribution with a Monte Carlo calibration curve obtained with different b lifetimes, an average b hadron lifetime of 1.51 +/- 0.08 ps is extracted.

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				Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
			
	Data di pubblicazione
	
				1993
			
	Rivista in ANCE
	
				PHYSICS LETTERS. SECTION B
			
	DOI
	
				https://dx.doi.org/10.1016/0370-2693(93)91265-O
			
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