ALEPH's published measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the b/c hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of R-b is measured to be 0.2167 +/- 0.0011(stat) +/- 0.0013(syst).
A measurement of Rb using a lifetime-mass tag / 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, Donato Maria; Depalma, M; Gelao, G; Iaselli, Giuseppe; Maggi, Giorgio Pietro; 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.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 401:1-2(1997), pp. 150-162. [10.1016/S0370-2693(97)00406-1]
A measurement of Rb using a lifetime-mass tag
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, Donato Maria ;dePalma M; Gelao G; IASELLI, Giuseppe ;MAGGI, Giorgio Pietro ;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.
1997-01-01
Abstract
ALEPH's published measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the b/c hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of R-b is measured to be 0.2167 +/- 0.0011(stat) +/- 0.0013(syst).
Citazione
A measurement of Rb using a lifetime-mass tag / 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, Donato Maria; Depalma, M; Gelao, G; Iaselli, Giuseppe; Maggi, Giorgio Pietro; 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.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 401:1-2(1997), pp. 150-162. [10.1016/S0370-2693(97)00406-1]
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