Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration

A. Heister; S. Schael; R. Barate; I. De Bonis; D. Decamp; C. Goy; J. P. Lees; E. Merle; M. N. Minard; B. Pietrzyk; G. Boix; S. Bravo; M. P. Casado; M. Chmeissani; J. M. Crespo; E. Fernandez; M. Fernandez-Bosman; Ll Garrido; E. Graugés; M. Martinez; G. Merino; R. Miquel; Ll M. Mir; A. Pacheco; H. Ruiz; A. Colaleo; D. Creanza; M. De Palma; G. Iaselli; G. Maggi; M. Maggi; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito; X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao; D. Abbaneo; P. Azzurri; O. Buchmüller; M. Cattaneo; F. Cerutti; B. Clerbaux; H. Drevermann; R. W. Forty; M. Frank; F. Gianotti; T. C. Greening; J. B. Hansen; J. Harvey; D. E. Hutchcroft; P. Janot; B. Jost; M. Kado; P. Mato; A. Moutoussi; F. Ranjard; L. Rolandi; D. Schlatter; O. Schneider; G. Sguazzoni; W. Tejessy; F. Teubert; A. Valassi; I. Videau; J. Ward; F. Badaud; A. Falvard; P. Gay; P. Henrard; J. Jousset; B. Michel; S. Monteil; J. C. Montret; D. Pallin; P. Perret; J. D. Hansen; J. R. Hansen; P. H. Hansen; B. S. Nilsson; A. Wäänänen; A. Kyriakis; C. Markou; E. Simopoulou; A. Vayaki; K. Zachariadou; A. Blondel; G. Bonneaud; J. C. Brient; A. Rougé; M. Rumpf; M. Swynghedauw; M. Verderi; H. Videau; V. Ciulli; E. Focardi; G. Parrini; A. Antonelli; M. Antonelli; G. Bencivenni; G. Bologna; F. Bossi; P. Campana; G. Capon; V. Chiarella; P. Laurelli; G. Mannocchi; F. Murtas; G. P. Murtas; L. Passalacqua; M. Pepe-Altarelli; P. Spagnolo; A. W. Halley; J. G. Lynch; P. Negus; V. O'Shea; C. Raine; A. S. Thompson; S. Wasserbaech; R. Cavanaugh; S. Dhamotharan; C. Geweniger; P. Hanke; G. Hansper; V. Hepp; E. E. Kluge; A. Putzer; J. Sommer; H. Stenzel; K. Tittel; S. Werner; M. Wunsch; R. Beuselinck; D. M. Binnie; W. Cameron; P. J. Dornan; M. Girone; N. Marinelli; J. K. Sedgbeer; J. C. Thomson; V. M. Ghete; P. Girtler; E. Kneringer; D. Kuhn; G. Rudolph; E. Bouhova-Thacker; C. K. Bowdery; A. J. Finch; F. Foster; G. Hughes; R. W.L. Jones; M. R. Pearson; N. A. Robertson; K. Jakobs; K. Kleinknecht; G. Quast; B. Renk; H. G. Sander; H. Wachsmuth; C. Zeitnitz; A. Bonissent; J. Carr; P. Coyle; O. Leroy; P. Payre; D. Rousseau; M. Talby; F. Ragusa; H. Dietl; G. Ganis; K. Hüttmann; G. Lütjens; C. Mannert; W. Männer; H. G. Moser; R. Settles; W. Wiedenmann; G. Wolf; J. Boucrot; O. Callot; M. Davier; L. Duflot; J. F. Grivaz; Ph Heusse; A. Jacholkowska; J. Lefrançois; J. J. Veillet; C. Yuan; G. Bagliesi; T. Boccali; L. Fòa; A. Giammanco; A. Giassi; F. Ligabue; A. Messineo; F. Palla; G. Sanguinetti; A. Sciab`a; R. Tenchini; A. Venturi; P. G. Verdini; G. A. Blair; G. Cowan; M. G. Green; T. Medcalf; A. Misiejuk; J. A. Strong; P. Teixeira-Dias; J. H. von Wimmersperg-Toeller; R. W. Clifft; T. R. Edgecock; P. R. Norton; I. R. Tomalin; B. Bloch-Devaux; P. Colas; S. Emery; W. Kozanecki; E. Lan¸con; M. C. Lemaire; E. Locci; P. Perez; J. Rander; J. F. Renardy; A. Roussarie; J. P. Schuller; J. Schwindling; A. Trabelsi; B. Vallage; N. Konstantinidis; A. M. Litke; G. Taylor; C. N. Booth; S. Cartwright; F. Combley; M. Lehto; L. F. Thompson; K. Affholderbach; A. Böohrer; S. Brandt; C. Grupen; A. Ngac; G. Prange; U. Sieler; G. Giannini; J. Rothberg; S. R. Armstrong; K. Berkelman; K. Cranmer; D. P.S. Ferguson; Y. Gao; S. González; O. J. Hayes; H. Hu; S. Jin; J. Kile; P. A. McNamara; J. Nielsen; Y. B. Pan; J. H. von Wimmersperg-Toeller; W. Wiedenmann; J. Wu; S. L. Wu; X. Wu; G. Zobernig; G. Dissertori

doi:10.1007/s100520200950

Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration

A. Heister, S. Schael, R. Barate, I. De Bonis, D. Decamp, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, G. Boix, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugés, M. MartinezG. Merino, R. Miquel, Ll M. Mir, A. Pacheco, H. Ruiz, A. Colaleo, D. Creanza, M. De Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, P. Azzurri, O. Buchmüller, M. Cattaneo, F. Cerutti, B. Clerbaux, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, T. C. Greening, J. B. Hansen, J. Harvey, D. E. Hutchcroft, P. Janot, B. Jost, M. Kado, P. Mato, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, O. Schneider, G. Sguazzoni, W. Tejessy, F. Teubert, A. Valassi, I. Videau, J. Ward, F. Badaud, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, A. Wäänänen, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. C. Brient, A. Rougé, M. Rumpf, M. Swynghedauw, M. Verderi, H. Videau, V. Ciulli, E. Focardi, G. Parrini, A. Antonelli, M. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, L. Passalacqua, M. Pepe-Altarelli, P. Spagnolo, A. W. Halley, J. G. Lynch, P. Negus, V. O'Shea, C. Raine, A. S. Thompson, S. Wasserbaech, R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E. E. Kluge, A. Putzer, J. Sommer, H. Stenzel, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. M. Binnie, W. Cameron, P. J. Dornan, M. Girone, N. Marinelli, J. K. Sedgbeer, J. C. Thomson, V. M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, E. Bouhova-Thacker, C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes, R. W.L. Jones, M. R. Pearson, N. A. Robertson, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, H. G. Sander, H. Wachsmuth, C. Zeitnitz, A. Bonissent, J. Carr, P. Coyle, O. Leroy, P. Payre, D. Rousseau, M. Talby, F. Ragusa, H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, C. Mannert, W. Männer, H. G. Moser, R. Settles, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, M. Davier, L. Duflot, J. F. Grivaz, Ph Heusse, A. Jacholkowska, J. Lefrançois, J. J. Veillet, C. Yuan, G. Bagliesi, T. Boccali, L. Fòa, A. Giammanco, A. Giassi, F. Ligabue, A. Messineo, F. Palla, G. Sanguinetti, A. Sciab`a, R. Tenchini, A. Venturi, P. G. Verdini, G. A. Blair, G. Cowan, M. G. Green, T. Medcalf, A. Misiejuk, J. A. Strong, P. Teixeira-Dias, J. H. von Wimmersperg-Toeller, R. W. Clifft, T. R. Edgecock, P. R. Norton, I. R. Tomalin, B. Bloch-Devaux, P. Colas, S. Emery, W. Kozanecki, E. Lan¸con, M. C. Lemaire, E. Locci, P. Perez, J. Rander, J. F. Renardy, A. Roussarie, J. P. Schuller, J. Schwindling, A. Trabelsi, B. Vallage, N. Konstantinidis, A. M. Litke, G. Taylor, C. N. Booth, S. Cartwright, F. Combley, M. Lehto, L. F. Thompson, K. Affholderbach, A. Böohrer, S. Brandt, C. Grupen, A. Ngac, G. Prange, U. Sieler, G. Giannini, J. Rothberg, S. R. Armstrong, K. Berkelman, K. Cranmer, D. P.S. Ferguson, Y. Gao, S. González, O. J. Hayes, H. Hu, S. Jin, J. Kile, P. A. McNamara, J. Nielsen, Y. B. Pan, J. H. von Wimmersperg-Toeller, W. Wiedenmann, J. Wu, S. L. Wu, X. Wu, G. Zobernig, G. Dissertori

Research output: Contribution to journal › Article › peer-review

Abstract

The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z → bb̄ and Z → cc̄ events and the B ⁰ -B̄ ⁰ average mixing parameter χ̄. Quark charges are tagged by the charges of electrons and muons produced in b and e semileptonic decays. Multivariate analyses are used to separate the event flavours and b → ℓ/b → c → ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ̄ = 0.1196 ± 0.0049 (stat.) _-0.0050 ^+0.0043 (syst.), A _FB ^0,b = 0.0998 ± 0.0040 (stat.) ± 0.0017 (syst.), A _FB ^0,c = 0.0732 ± 0.0053 (stat.) ± 0.0037 (syst.). These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin ² θ _W ^eff = 0.23188 ± 0.00046.

Original language	English (US)
Pages (from-to)	177-191
Number of pages	15
Journal	European Physical Journal C
Volume	24
Issue number	2
DOIs	https://doi.org/10.1007/s100520200950
State	Published - Jun 2002

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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10.1007/s100520200950

Cite this

Heister, A., Schael, S., Barate, R., De Bonis, I., Decamp, D., Goy, C., Lees, J. P., Merle, E., Minard, M. N., Pietrzyk, B., Boix, G., Bravo, S., Casado, M. P., Chmeissani, M., Crespo, J. M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Graugés, E., ... Dissertori, G. (2002). Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration. European Physical Journal C, 24(2), 177-191. https://doi.org/10.1007/s100520200950

Heister, A, Schael, S, Barate, R, De Bonis, I, Decamp, D, Goy, C, Lees, JP, Merle, E, Minard, MN, Pietrzyk, B, Boix, G, Bravo, S, Casado, MP, Chmeissani, M, Crespo, JM, Fernandez, E, Fernandez-Bosman, M, Garrido, L, Graugés, E, Martinez, M, Merino, G, Miquel, R, Mir, LM, Pacheco, A, Ruiz, H, Colaleo, A, Creanza, D, De Palma, M, Iaselli, G, Maggi, G, Maggi, M, 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, Azzurri, P, Buchmüller, O, Cattaneo, M, Cerutti, F, Clerbaux, B, Drevermann, H, Forty, RW, Frank, M, Gianotti, F, Greening, TC, Hansen, JB, Harvey, J, Hutchcroft, DE, Janot, P, Jost, B, Kado, M, Mato, P, Moutoussi, A, Ranjard, F, Rolandi, L, Schlatter, D, Schneider, O, Sguazzoni, G, Tejessy, W, Teubert, F, Valassi, A, Videau, I, Ward, J, Badaud, F, Falvard, A, Gay, P, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, JC, Pallin, D, Perret, P, Hansen, JD, Hansen, JR, Hansen, PH, Nilsson, BS, Wäänänen, A, Kyriakis, A, Markou, C, Simopoulou, E, Vayaki, A, Zachariadou, K, Blondel, A, Bonneaud, G, Brient, JC, Rougé, A, Rumpf, M, Swynghedauw, M, Verderi, M, Videau, H, Ciulli, V, Focardi, E, Parrini, G, Antonelli, A, Antonelli, M, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, GP, Passalacqua, L, Pepe-Altarelli, M, Spagnolo, P, Halley, AW, Lynch, JG, Negus, P, O'Shea, V, Raine, C, Thompson, AS, Wasserbaech, S, Cavanaugh, R, Dhamotharan, S, Geweniger, C, Hanke, P, Hansper, G, Hepp, V, Kluge, EE, Putzer, A, Sommer, J, Stenzel, H, Tittel, K, Werner, S, Wunsch, M, Beuselinck, R, Binnie, DM, Cameron, W, Dornan, PJ, Girone, M, Marinelli, N, Sedgbeer, JK, Thomson, JC, Ghete, VM, Girtler, P, Kneringer, E, Kuhn, D, Rudolph, G, Bouhova-Thacker, E, Bowdery, CK, Finch, AJ, Foster, F, Hughes, G, Jones, RWL, Pearson, MR, Robertson, NA, Jakobs, K, Kleinknecht, K, Quast, G, Renk, B, Sander, HG, Wachsmuth, H, Zeitnitz, C, Bonissent, A, Carr, J, Coyle, P, Leroy, O, Payre, P, Rousseau, D, Talby, M, Ragusa, F, Dietl, H, Ganis, G, Hüttmann, K, Lütjens, G, Mannert, C, Männer, W, Moser, HG, Settles, R, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Davier, M, Duflot, L, Grivaz, JF, Heusse, P, Jacholkowska, A, Lefrançois, J, Veillet, JJ, Yuan, C, Bagliesi, G, Boccali, T, Fòa, L, Giammanco, A, Giassi, A, Ligabue, F, Messineo, A, Palla, F, Sanguinetti, G, Sciab`a, A, Tenchini, R, Venturi, A, Verdini, PG, Blair, GA, Cowan, G, Green, MG, Medcalf, T, Misiejuk, A, Strong, JA, Teixeira-Dias, P, von Wimmersperg-Toeller, JH, Clifft, RW, Edgecock, TR, Norton, PR, Tomalin, IR, Bloch-Devaux, B, Colas, P, Emery, S, Kozanecki, W, Lan¸con, E, Lemaire, MC, Locci, E, Perez, P, Rander, J, Renardy, JF, Roussarie, A, Schuller, JP, Schwindling, J, Trabelsi, A, Vallage, B, Konstantinidis, N, Litke, AM, Taylor, G, Booth, CN, Cartwright, S, Combley, F, Lehto, M, Thompson, LF, Affholderbach, K, Böohrer, A, Brandt, S, Grupen, C, Ngac, A, Prange, G, Sieler, U, Giannini, G, Rothberg, J, Armstrong, SR, Berkelman, K, Cranmer, K, Ferguson, DPS, Gao, Y, González, S, Hayes, OJ, Hu, H, Jin, S, Kile, J, McNamara, PA, Nielsen, J, Pan, YB, von Wimmersperg-Toeller, JH, Wiedenmann, W, Wu, J, Wu, SL, Wu, X, Zobernig, G & Dissertori, G 2002, 'Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration', European Physical Journal C, vol. 24, no. 2, pp. 177-191. https://doi.org/10.1007/s100520200950

@article{59ca5067fb0049b0b15d0ce8d40b2c85,

title = "Measurement of the forward-backward asymmetry in Z → b{\=b} and Z → c{\=c} decays with leptons: The ALEPH collaboration",

abstract = " The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z → b{\=b} and Z → c{\=c} events and the B 0 -{\=B} 0 average mixing parameter {\=χ}. Quark charges are tagged by the charges of electrons and muons produced in b and e semileptonic decays. Multivariate analyses are used to separate the event flavours and b → ℓ/b → c → ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be {\=χ} = 0.1196 ± 0.0049 (stat.) -0.0050 +0.0043 (syst.), A FB 0,b = 0.0998 ± 0.0040 (stat.) ± 0.0017 (syst.), A FB 0,c = 0.0732 ± 0.0053 (stat.) ± 0.0037 (syst.). These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin 2 θ W eff = 0.23188 ± 0.00046. ",

author = "A. Heister and S. Schael and R. Barate and {De Bonis}, I. and D. Decamp and C. Goy and Lees, {J. P.} and E. Merle and Minard, {M. N.} and B. Pietrzyk and G. Boix and S. Bravo and Casado, {M. P.} and M. Chmeissani and Crespo, {J. M.} and E. Fernandez and M. Fernandez-Bosman and Ll Garrido and E. Graug{\'e}s and M. Martinez and G. Merino and R. Miquel and Mir, {Ll M.} and A. Pacheco and H. Ruiz and A. Colaleo and D. Creanza and {De Palma}, M. and G. Iaselli and G. Maggi and M. Maggi and S. Nuzzo and A. Ranieri and G. Raso and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta and A. Tricomi and G. Zito and X. Huang and J. Lin and Q. Ouyang and T. Wang and Y. Xie and R. Xu and S. Xue and J. Zhang and L. Zhang and W. Zhao and D. Abbaneo and P. Azzurri and O. Buchm{\"u}ller and M. Cattaneo and F. Cerutti and B. Clerbaux and H. Drevermann and Forty, {R. W.} and M. Frank and F. Gianotti and Greening, {T. C.} and Hansen, {J. B.} and J. Harvey and Hutchcroft, {D. E.} and P. Janot and B. Jost and M. Kado and P. Mato and A. Moutoussi and F. Ranjard and L. Rolandi and D. Schlatter and O. Schneider and G. Sguazzoni and W. Tejessy and F. Teubert and A. Valassi and I. Videau and J. Ward and F. Badaud and A. Falvard and P. Gay and P. Henrard and J. Jousset and B. Michel and S. Monteil and Montret, {J. C.} and D. Pallin and P. Perret and Hansen, {J. D.} and Hansen, {J. R.} and Hansen, {P. H.} and Nilsson, {B. S.} and A. W{\"a}{\"a}n{\"a}nen and A. Kyriakis and C. Markou and E. Simopoulou and A. Vayaki and K. Zachariadou and A. Blondel and G. Bonneaud and Brient, {J. C.} and A. Roug{\'e} and M. Rumpf and M. Swynghedauw and M. Verderi and H. Videau and V. Ciulli and E. Focardi and G. Parrini and A. Antonelli and M. Antonelli and G. Bencivenni and G. Bologna and F. Bossi and P. Campana and G. Capon and V. Chiarella and P. Laurelli and G. Mannocchi and F. Murtas and Murtas, {G. P.} and L. Passalacqua and M. Pepe-Altarelli and P. Spagnolo and Halley, {A. W.} and Lynch, {J. G.} and P. Negus and V. O'Shea and C. Raine and Thompson, {A. S.} and S. Wasserbaech and R. Cavanaugh and S. Dhamotharan and C. Geweniger and P. Hanke and G. Hansper and V. Hepp and Kluge, {E. E.} and A. Putzer and J. Sommer and H. Stenzel and K. Tittel and S. Werner and M. Wunsch and R. Beuselinck and Binnie, {D. M.} and W. Cameron and Dornan, {P. J.} and M. Girone and N. Marinelli and Sedgbeer, {J. K.} and Thomson, {J. C.} and Ghete, {V. M.} and P. Girtler and E. Kneringer and D. Kuhn and G. Rudolph and E. Bouhova-Thacker and Bowdery, {C. K.} and Finch, {A. J.} and F. Foster and G. Hughes and Jones, {R. W.L.} and Pearson, {M. R.} and Robertson, {N. A.} and K. Jakobs and K. Kleinknecht and G. Quast and B. Renk and Sander, {H. G.} and H. Wachsmuth and C. Zeitnitz and A. Bonissent and J. Carr and P. Coyle and O. Leroy and P. Payre and D. Rousseau and M. Talby and F. Ragusa and H. Dietl and G. Ganis and K. H{\"u}ttmann and G. L{\"u}tjens and C. Mannert and W. M{\"a}nner and Moser, {H. G.} and R. Settles and W. Wiedenmann and G. Wolf and J. Boucrot and O. Callot and M. Davier and L. Duflot and Grivaz, {J. F.} and Ph Heusse and A. Jacholkowska and J. Lefran{\c c}ois and Veillet, {J. J.} and C. Yuan and G. Bagliesi and T. Boccali and L. F{\`o}a and A. Giammanco and A. Giassi and F. Ligabue and A. Messineo and F. Palla and G. Sanguinetti and A. Sciab`a and R. Tenchini and A. Venturi and Verdini, {P. G.} and Blair, {G. A.} and G. Cowan and Green, {M. G.} and T. Medcalf and A. Misiejuk and Strong, {J. A.} and P. Teixeira-Dias and {von Wimmersperg-Toeller}, {J. H.} and Clifft, {R. W.} and Edgecock, {T. R.} and Norton, {P. R.} and Tomalin, {I. R.} and B. Bloch-Devaux and P. Colas and S. Emery and W. Kozanecki and E. Lan¸con and Lemaire, {M. C.} and E. Locci and P. Perez and J. Rander and Renardy, {J. F.} and A. Roussarie and Schuller, {J. P.} and J. Schwindling and A. Trabelsi and B. Vallage and N. Konstantinidis and Litke, {A. M.} and G. Taylor and Booth, {C. N.} and S. Cartwright and F. Combley and M. Lehto and Thompson, {L. F.} and K. Affholderbach and A. B{\"o}ohrer and S. Brandt and C. Grupen and A. Ngac and G. Prange and U. Sieler and G. Giannini and J. Rothberg and Armstrong, {S. R.} and K. Berkelman and K. Cranmer and Ferguson, {D. P.S.} and Y. Gao and S. Gonz{\'a}lez and Hayes, {O. J.} and H. Hu and S. Jin and J. Kile and McNamara, {P. A.} and J. Nielsen and Pan, {Y. B.} and {von Wimmersperg-Toeller}, {J. H.} and W. Wiedenmann and J. Wu and Wu, {S. L.} and X. Wu and G. Zobernig and G. Dissertori",

year = "2002",

month = jun,

doi = "10.1007/s100520200950",

language = "English (US)",

volume = "24",

pages = "177--191",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "2",

}

TY - JOUR

T1 - Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons

T2 - The ALEPH collaboration

AU - Heister, A.

AU - Schael, S.

AU - Barate, R.

AU - De Bonis, I.

AU - Decamp, D.

AU - Goy, C.

AU - Lees, J. P.

AU - Merle, E.

AU - Minard, M. N.

AU - Pietrzyk, B.

AU - Boix, G.

AU - Bravo, S.

AU - Casado, M. P.

AU - Chmeissani, M.

AU - Crespo, J. M.

AU - Fernandez, E.

AU - Fernandez-Bosman, M.

AU - Garrido, Ll

AU - Graugés, E.

AU - Martinez, M.

AU - Merino, G.

AU - Miquel, R.

AU - Mir, Ll M.

AU - Pacheco, A.

AU - Ruiz, H.

AU - Colaleo, A.

AU - Creanza, D.

AU - De Palma, M.

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PY - 2002/6

Y1 - 2002/6

N2 - The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z → bb̄ and Z → cc̄ events and the B 0 -B̄ 0 average mixing parameter χ̄. Quark charges are tagged by the charges of electrons and muons produced in b and e semileptonic decays. Multivariate analyses are used to separate the event flavours and b → ℓ/b → c → ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ̄ = 0.1196 ± 0.0049 (stat.) -0.0050 +0.0043 (syst.), A FB 0,b = 0.0998 ± 0.0040 (stat.) ± 0.0017 (syst.), A FB 0,c = 0.0732 ± 0.0053 (stat.) ± 0.0037 (syst.). These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin 2 θ W eff = 0.23188 ± 0.00046.

AB - The sample of hadronic Z decays collected by the ALEPH detector at LEP in the years 1991-1995 is analysed in order to measure the forward-backward asymmetry in Z → bb̄ and Z → cc̄ events and the B 0 -B̄ 0 average mixing parameter χ̄. Quark charges are tagged by the charges of electrons and muons produced in b and e semileptonic decays. Multivariate analyses are used to separate the event flavours and b → ℓ/b → c → ℓ processes. The b and c quark asymmetries are measured simultaneously; the average mixing parameter and the pole asymmetries are determined to be χ̄ = 0.1196 ± 0.0049 (stat.) -0.0050 +0.0043 (syst.), A FB 0,b = 0.0998 ± 0.0040 (stat.) ± 0.0017 (syst.), A FB 0,c = 0.0732 ± 0.0053 (stat.) ± 0.0037 (syst.). These asymmetries, combined with the ALEPH measurements of the b asymmetry using inclusive b hadron decays and of the c asymmetry using reconstructed D mesons, correspond to a value of the effective electroweak mixing angle of sin 2 θ W eff = 0.23188 ± 0.00046.

UR - http://www.scopus.com/inward/record.url?scp=0036627952&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036627952&partnerID=8YFLogxK

U2 - 10.1007/s100520200950

DO - 10.1007/s100520200950

M3 - Article

AN - SCOPUS:0036627952

SN - 1434-6044

VL - 24

SP - 177

EP - 191

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

ER -

Measurement of the forward-backward asymmetry in Z → bb̄ and Z → cc̄ decays with leptons: The ALEPH collaboration

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