Measurement of the Michel parameters and the vτ helicity in τ lepton decays

A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugés, M. Martinez, G. MerinoR. 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, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, B. Clerbaux, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, T. C. Greening, J. B. Hansen, J. Harvey, P. Janot, B. Jost, M. Kado, P. Mato, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, E. Tournefier, J. Ward, Z. Ajaltouni, F. Badaud, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, F. Podlyski, 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, 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, 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. Thompson, 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, I. Giehl, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H. G. Sander, H. Wachsmuth, C. Zeitnitz, A. Bonissent, J. Carr, P. Coyle, O. Leroy, P. Payre, D. Rousseau, M. Talby, M. Aleppo, F. Ragusa, A. David, H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, C. Mannert, W. Männer, H. G. Moser, R. Settles, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, M. Davier, L. Duflot, J. F. Grivaz, Ph Heusse, A. Jacholkowska, J. Lefrançois, J. J. Veillet, I. Videau, C. Yuan, G. Bagliesi, T. Boccali, G. Calderini, L. Foà, A. Giassi, F. Ligabue, A. Messineo, F. Palla, G. Sanguinetti, A. Sciabà, G. Sguazzoni, 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. Lançon, 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. Böhrer, S. Brandt, C. Grupen, A. Ngac, G. Prange, U. Sieler, G. Giannini, J. Rothberg, S. R. Armstrong, K. Cranmer, P. Elmer, D. P S Ferguson, Y. Gao, S. González, O. J. Hayes, H. Hu, S. Jin, J. Kile, P. A. McNamara, J. Nielsen, W. Orejudos, Y. B. Pan, Y. Saadi, I. J. Scott, J. Walsh, S. L. Wu, X. Wu, G. Zobernig

    Research output: Contribution to journalArticle

    Abstract

    A measurement of the Michel parameters and the average vτ helicity in τ lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 pb-1 is analysed. The Michel parameters ρl, ξl, (ξδ)l (l = e, μ), and ημ are determined for the leptonic decays, and the chirality parameters ξπ, ξρ, and ξa1 for the hadronic final states. Under the assumptions of e-μ universality and ξπ = ξρ = ξa1, the values ρl = 0.742 ± 0.016, ηl = 0.012 ± 0.026, (ξδ)l = 0.776 ± 0.051, ξl = 0.986 ± 0.074, and ξh = 0.992 ± 0.011 are obtained. No significant deviation is observed from the Standard Model assumption of the V - A structure of the charged weak interaction.

    Original languageEnglish (US)
    Pages (from-to)217-230
    Number of pages14
    JournalEuropean Physical Journal C
    Volume22
    Issue number2
    StatePublished - Nov 2001

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    Chirality
    leptons
    Luminance
    Detectors
    decay
    chirality
    luminosity
    deviation
    detectors

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Heister, A., Schael, S., Barate, R., de Bonis, I., Decamp, D., Goy, C., ... Zobernig, G. (2001). Measurement of the Michel parameters and the vτ helicity in τ lepton decays. European Physical Journal C, 22(2), 217-230.

    Measurement of the Michel parameters and the vτ helicity in τ lepton decays. / Heister, A.; Schael, S.; Barate, R.; de Bonis, I.; Decamp, D.; Goy, C.; Lees, J. P.; Merle, E.; Minard, M. N.; Pietrzyk, B.; Bravo, S.; Casado, M. P.; Chmeissani, M.; Crespo, J. M.; Fernandez, E.; Fernandez-Bosman, M.; Garrido, Ll; Graugés, E.; Martinez, M.; Merino, G.; Miquel, R.; Mir, Ll M.; 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.; Boix, G.; Buchmüller, O.; Cattaneo, M.; Cerutti, F.; Clerbaux, B.; Dissertori, G.; Drevermann, H.; Forty, R. W.; Frank, M.; Greening, T. C.; Hansen, J. B.; Harvey, J.; Janot, P.; Jost, B.; Kado, M.; Mato, P.; Moutoussi, A.; Ranjard, F.; Rolandi, L.; Schlatter, D.; Schneider, O.; Spagnolo, P.; Tejessy, W.; Teubert, F.; Tournefier, E.; Ward, J.; Ajaltouni, Z.; Badaud, F.; Falvard, A.; Gay, P.; Henrard, P.; Jousset, J.; Michel, B.; Monteil, S.; Montret, J. C.; Pallin, D.; Perret, P.; Podlyski, F.; Hansen, J. D.; Hansen, J. R.; Hansen, P. H.; Nilsson, B. S.; Wäänänen, A.; Kyriakis, A.; Markou, C.; Simopoulou, E.; Vayaki, A.; Zachariadou, K.; Blondel, A.; Bonneaud, G.; Brient, J. C.; 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, G. P.; Passalacqua, L.; Pepe-Altarelli, M.; Halley, A. W.; Lynch, J. G.; Negus, P.; O'Shea, V.; Raine, C.; Thompson, A. S.; Wasserbaech, S.; Cavanaugh, R.; Dhamotharan, S.; Geweniger, C.; Hanke, P.; Hansper, G.; Hepp, V.; Kluge, E. E.; Putzer, A.; Sommer, J.; Tittel, K.; Werner, S.; Wunsch, M.; Beuselinck, R.; Binnie, D. M.; Cameron, W.; Dornan, P. J.; Girone, M.; Marinelli, N.; Sedgbeer, J. K.; Thompson, J. C.; Ghete, V. M.; Girtler, P.; Kneringer, E.; Kuhn, D.; Rudolph, G.; Bouhova-Thacker, E.; Bowdery, C. K.; Finch, A. J.; Foster, F.; Hughes, G.; Jones, R. W L; Pearson, M. R.; Robertson, N. A.; Giehl, I.; Jakobs, K.; Kleinknecht, K.; Quast, G.; Renk, B.; Rohne, E.; Sander, H. G.; Wachsmuth, H.; Zeitnitz, C.; Bonissent, A.; Carr, J.; Coyle, P.; Leroy, O.; Payre, P.; Rousseau, D.; Talby, M.; Aleppo, M.; Ragusa, F.; David, A.; Dietl, H.; Ganis, G.; Hüttmann, K.; Lütjens, G.; Mannert, C.; Männer, W.; Moser, H. G.; Settles, R.; Stenzel, H.; Wiedenmann, W.; Wolf, G.; Boucrot, J.; Callot, O.; Davier, M.; Duflot, L.; Grivaz, J. F.; Heusse, Ph; Jacholkowska, A.; Lefrançois, J.; Veillet, J. J.; Videau, I.; Yuan, C.; Bagliesi, G.; Boccali, T.; Calderini, G.; Foà, L.; Giassi, A.; Ligabue, F.; Messineo, A.; Palla, F.; Sanguinetti, G.; Sciabà, A.; Sguazzoni, G.; Tenchini, R.; Venturi, A.; Verdini, P. G.; Blair, G. A.; Cowan, G.; Green, M. G.; Medcalf, T.; Misiejuk, A.; Strong, J. A.; Teixeira-Dias, P.; von Wimmersperg-Toeller, J. H.; Clifft, R. W.; Edgecock, T. R.; Norton, P. R.; Tomalin, I. R.; Bloch-Devaux, B.; Colas, P.; Emery, S.; Kozanecki, W.; Lançon, E.; Lemaire, M. C.; Locci, E.; Perez, P.; Rander, J.; Renardy, J. F.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Trabelsi, A.; Vallage, B.; Konstantinidis, N.; Litke, A. M.; Taylor, G.; Booth, C. N.; Cartwright, S.; Combley, F.; Lehto, M.; Thompson, L. F.; Affholderbach, K.; Böhrer, A.; Brandt, S.; Grupen, C.; Ngac, A.; Prange, G.; Sieler, U.; Giannini, G.; Rothberg, J.; Armstrong, S. R.; Cranmer, K.; Elmer, P.; Ferguson, D. P S; Gao, Y.; González, S.; Hayes, O. J.; Hu, H.; Jin, S.; Kile, J.; McNamara, P. A.; Nielsen, J.; Orejudos, W.; Pan, Y. B.; Saadi, Y.; Scott, I. J.; Walsh, J.; Wu, S. L.; Wu, X.; Zobernig, G.

    In: European Physical Journal C, Vol. 22, No. 2, 11.2001, p. 217-230.

    Research output: Contribution to journalArticle

    Heister, A, Schael, S, Barate, R, de Bonis, I, Decamp, D, Goy, C, Lees, JP, Merle, E, Minard, MN, Pietrzyk, B, 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, Boix, G, Buchmüller, O, Cattaneo, M, Cerutti, F, Clerbaux, B, Dissertori, G, Drevermann, H, Forty, RW, Frank, M, Greening, TC, Hansen, JB, Harvey, J, Janot, P, Jost, B, Kado, M, Mato, P, Moutoussi, A, Ranjard, F, Rolandi, L, Schlatter, D, Schneider, O, Spagnolo, P, Tejessy, W, Teubert, F, Tournefier, E, Ward, J, Ajaltouni, Z, Badaud, F, Falvard, A, Gay, P, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, JC, Pallin, D, Perret, P, Podlyski, F, 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, 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, Tittel, K, Werner, S, Wunsch, M, Beuselinck, R, Binnie, DM, Cameron, W, Dornan, PJ, Girone, M, Marinelli, N, Sedgbeer, JK, Thompson, 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, Giehl, I, Jakobs, K, Kleinknecht, K, Quast, G, Renk, B, Rohne, E, Sander, HG, Wachsmuth, H, Zeitnitz, C, Bonissent, A, Carr, J, Coyle, P, Leroy, O, Payre, P, Rousseau, D, Talby, M, Aleppo, M, Ragusa, F, David, A, Dietl, H, Ganis, G, Hüttmann, K, Lütjens, G, Mannert, C, Männer, W, Moser, HG, Settles, R, Stenzel, H, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Davier, M, Duflot, L, Grivaz, JF, Heusse, P, Jacholkowska, A, Lefrançois, J, Veillet, JJ, Videau, I, Yuan, C, Bagliesi, G, Boccali, T, Calderini, G, Foà, L, Giassi, A, Ligabue, F, Messineo, A, Palla, F, Sanguinetti, G, Sciabà, A, Sguazzoni, G, 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, Lançon, 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, Böhrer, A, Brandt, S, Grupen, C, Ngac, A, Prange, G, Sieler, U, Giannini, G, Rothberg, J, Armstrong, SR, Cranmer, K, Elmer, P, Ferguson, DPS, Gao, Y, González, S, Hayes, OJ, Hu, H, Jin, S, Kile, J, McNamara, PA, Nielsen, J, Orejudos, W, Pan, YB, Saadi, Y, Scott, IJ, Walsh, J, Wu, SL, Wu, X & Zobernig, G 2001, 'Measurement of the Michel parameters and the vτ helicity in τ lepton decays', European Physical Journal C, vol. 22, no. 2, pp. 217-230.
    Heister A, Schael S, Barate R, de Bonis I, Decamp D, Goy C et al. Measurement of the Michel parameters and the vτ helicity in τ lepton decays. European Physical Journal C. 2001 Nov;22(2):217-230.
    Heister, A. ; Schael, S. ; Barate, R. ; de Bonis, I. ; Decamp, D. ; Goy, C. ; Lees, J. P. ; Merle, E. ; Minard, M. N. ; Pietrzyk, B. ; Bravo, S. ; Casado, M. P. ; Chmeissani, M. ; Crespo, J. M. ; Fernandez, E. ; Fernandez-Bosman, M. ; Garrido, Ll ; Graugés, E. ; Martinez, M. ; Merino, G. ; Miquel, R. ; Mir, Ll M. ; 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. ; Boix, G. ; Buchmüller, O. ; Cattaneo, M. ; Cerutti, F. ; Clerbaux, B. ; Dissertori, G. ; Drevermann, H. ; Forty, R. W. ; Frank, M. ; Greening, T. C. ; Hansen, J. B. ; Harvey, J. ; Janot, P. ; Jost, B. ; Kado, M. ; Mato, P. ; Moutoussi, A. ; Ranjard, F. ; Rolandi, L. ; Schlatter, D. ; Schneider, O. ; Spagnolo, P. ; Tejessy, W. ; Teubert, F. ; Tournefier, E. ; Ward, J. ; Ajaltouni, Z. ; Badaud, F. ; Falvard, A. ; Gay, P. ; Henrard, P. ; Jousset, J. ; Michel, B. ; Monteil, S. ; Montret, J. C. ; Pallin, D. ; Perret, P. ; Podlyski, F. ; Hansen, J. D. ; Hansen, J. R. ; Hansen, P. H. ; Nilsson, B. S. ; Wäänänen, A. ; Kyriakis, A. ; Markou, C. ; Simopoulou, E. ; Vayaki, A. ; Zachariadou, K. ; Blondel, A. ; Bonneaud, G. ; Brient, J. C. ; 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, G. P. ; Passalacqua, L. ; Pepe-Altarelli, M. ; Halley, A. W. ; Lynch, J. G. ; Negus, P. ; O'Shea, V. ; Raine, C. ; Thompson, A. S. ; Wasserbaech, S. ; Cavanaugh, R. ; Dhamotharan, S. ; Geweniger, C. ; Hanke, P. ; Hansper, G. ; Hepp, V. ; Kluge, E. E. ; Putzer, A. ; Sommer, J. ; Tittel, K. ; Werner, S. ; Wunsch, M. ; Beuselinck, R. ; Binnie, D. M. ; Cameron, W. ; Dornan, P. J. ; Girone, M. ; Marinelli, N. ; Sedgbeer, J. K. ; Thompson, J. C. ; Ghete, V. M. ; Girtler, P. ; Kneringer, E. ; Kuhn, D. ; Rudolph, G. ; Bouhova-Thacker, E. ; Bowdery, C. K. ; Finch, A. J. ; Foster, F. ; Hughes, G. ; Jones, R. W L ; Pearson, M. R. ; Robertson, N. A. ; Giehl, I. ; Jakobs, K. ; Kleinknecht, K. ; Quast, G. ; Renk, B. ; Rohne, E. ; Sander, H. G. ; Wachsmuth, H. ; Zeitnitz, C. ; Bonissent, A. ; Carr, J. ; Coyle, P. ; Leroy, O. ; Payre, P. ; Rousseau, D. ; Talby, M. ; Aleppo, M. ; Ragusa, F. ; David, A. ; Dietl, H. ; Ganis, G. ; Hüttmann, K. ; Lütjens, G. ; Mannert, C. ; Männer, W. ; Moser, H. G. ; Settles, R. ; Stenzel, H. ; Wiedenmann, W. ; Wolf, G. ; Boucrot, J. ; Callot, O. ; Davier, M. ; Duflot, L. ; Grivaz, J. F. ; Heusse, Ph ; Jacholkowska, A. ; Lefrançois, J. ; Veillet, J. J. ; Videau, I. ; Yuan, C. ; Bagliesi, G. ; Boccali, T. ; Calderini, G. ; Foà, L. ; Giassi, A. ; Ligabue, F. ; Messineo, A. ; Palla, F. ; Sanguinetti, G. ; Sciabà, A. ; Sguazzoni, G. ; Tenchini, R. ; Venturi, A. ; Verdini, P. G. ; Blair, G. A. ; Cowan, G. ; Green, M. G. ; Medcalf, T. ; Misiejuk, A. ; Strong, J. A. ; Teixeira-Dias, P. ; von Wimmersperg-Toeller, J. H. ; Clifft, R. W. ; Edgecock, T. R. ; Norton, P. R. ; Tomalin, I. R. ; Bloch-Devaux, B. ; Colas, P. ; Emery, S. ; Kozanecki, W. ; Lançon, E. ; Lemaire, M. C. ; Locci, E. ; Perez, P. ; Rander, J. ; Renardy, J. F. ; Roussarie, A. ; Schuller, J. P. ; Schwindling, J. ; Trabelsi, A. ; Vallage, B. ; Konstantinidis, N. ; Litke, A. M. ; Taylor, G. ; Booth, C. N. ; Cartwright, S. ; Combley, F. ; Lehto, M. ; Thompson, L. F. ; Affholderbach, K. ; Böhrer, A. ; Brandt, S. ; Grupen, C. ; Ngac, A. ; Prange, G. ; Sieler, U. ; Giannini, G. ; Rothberg, J. ; Armstrong, S. R. ; Cranmer, K. ; Elmer, P. ; Ferguson, D. P S ; Gao, Y. ; González, S. ; Hayes, O. J. ; Hu, H. ; Jin, S. ; Kile, J. ; McNamara, P. A. ; Nielsen, J. ; Orejudos, W. ; Pan, Y. B. ; Saadi, Y. ; Scott, I. J. ; Walsh, J. ; Wu, S. L. ; Wu, X. ; Zobernig, G. / Measurement of the Michel parameters and the vτ helicity in τ lepton decays. In: European Physical Journal C. 2001 ; Vol. 22, No. 2. pp. 217-230.
    @article{fdc8739a662d418b895eebfa7b5cb236,
    title = "Measurement of the Michel parameters and the vτ helicity in τ lepton decays",
    abstract = "A measurement of the Michel parameters and the average vτ helicity in τ lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 pb-1 is analysed. The Michel parameters ρl, ξl, (ξδ)l (l = e, μ), and ημ are determined for the leptonic decays, and the chirality parameters ξπ, ξρ, and ξa1 for the hadronic final states. Under the assumptions of e-μ universality and ξπ = ξρ = ξa1, the values ρl = 0.742 ± 0.016, ηl = 0.012 ± 0.026, (ξδ)l = 0.776 ± 0.051, ξl = 0.986 ± 0.074, and ξh = 0.992 ± 0.011 are obtained. No significant deviation is observed from the Standard Model assumption of the V - A structure of the charged weak interaction.",
    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 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 G. Boix and O. Buchm{\"u}ller and M. Cattaneo and F. Cerutti and B. Clerbaux and G. Dissertori and H. Drevermann and Forty, {R. W.} and M. Frank and Greening, {T. C.} and Hansen, {J. B.} and J. Harvey 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 P. Spagnolo and W. Tejessy and F. Teubert and E. Tournefier and J. Ward and Z. Ajaltouni 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 F. Podlyski 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 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 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 Thompson, {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 I. Giehl and K. Jakobs and K. Kleinknecht and G. Quast and B. Renk and E. Rohne 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 M. Aleppo and F. Ragusa and A. David 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 H. Stenzel 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{\cc}ois and Veillet, {J. J.} and I. Videau and C. Yuan and G. Bagliesi and T. Boccali and G. Calderini and L. Fo{\`a} and A. Giassi and F. Ligabue and A. Messineo and F. Palla and G. Sanguinetti and A. Sciab{\`a} and G. Sguazzoni 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{\cc}on 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}hrer 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. Cranmer and P. Elmer 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 W. Orejudos and Pan, {Y. B.} and Y. Saadi and Scott, {I. J.} and J. Walsh and Wu, {S. L.} and X. Wu and G. Zobernig",
    year = "2001",
    month = "11",
    language = "English (US)",
    volume = "22",
    pages = "217--230",
    journal = "European Physical Journal C",
    issn = "1434-6044",
    publisher = "Springer New York",
    number = "2",

    }

    TY - JOUR

    T1 - Measurement of the Michel parameters and the vτ helicity in τ lepton decays

    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 - 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.

    AU - Iaselli, G.

    AU - Maggi, G.

    AU - Maggi, M.

    AU - Nuzzo, S.

    AU - Ranieri, A.

    AU - Raso, G.

    AU - Ruggieri, F.

    AU - Selvaggi, G.

    AU - Silvestris, L.

    AU - Tempesta, P.

    AU - Tricomi, A.

    AU - Zito, G.

    AU - Huang, X.

    AU - Lin, J.

    AU - Ouyang, Q.

    AU - Wang, T.

    AU - Xie, Y.

    AU - Xu, R.

    AU - Xue, S.

    AU - Zhang, J.

    AU - Zhang, L.

    AU - Zhao, W.

    AU - Abbaneo, D.

    AU - Azzurri, P.

    AU - Boix, G.

    AU - Buchmüller, O.

    AU - Cattaneo, M.

    AU - Cerutti, F.

    AU - Clerbaux, B.

    AU - Dissertori, G.

    AU - Drevermann, H.

    AU - Forty, R. W.

    AU - Frank, M.

    AU - Greening, T. C.

    AU - Hansen, J. B.

    AU - Harvey, J.

    AU - Janot, P.

    AU - Jost, B.

    AU - Kado, M.

    AU - Mato, P.

    AU - Moutoussi, A.

    AU - Ranjard, F.

    AU - Rolandi, L.

    AU - Schlatter, D.

    AU - Schneider, O.

    AU - Spagnolo, P.

    AU - Tejessy, W.

    AU - Teubert, F.

    AU - Tournefier, E.

    AU - Ward, J.

    AU - Ajaltouni, Z.

    AU - Badaud, F.

    AU - Falvard, A.

    AU - Gay, P.

    AU - Henrard, P.

    AU - Jousset, J.

    AU - Michel, B.

    AU - Monteil, S.

    AU - Montret, J. C.

    AU - Pallin, D.

    AU - Perret, P.

    AU - Podlyski, F.

    AU - Hansen, J. D.

    AU - Hansen, J. R.

    AU - Hansen, P. H.

    AU - Nilsson, B. S.

    AU - Wäänänen, A.

    AU - Kyriakis, A.

    AU - Markou, C.

    AU - Simopoulou, E.

    AU - Vayaki, A.

    AU - Zachariadou, K.

    AU - Blondel, A.

    AU - Bonneaud, G.

    AU - Brient, J. C.

    AU - Rougé, A.

    AU - Rumpf, M.

    AU - Swynghedauw, M.

    AU - Verderi, M.

    AU - Videau, H.

    AU - Ciulli, V.

    AU - Focardi, E.

    AU - Parrini, G.

    AU - Antonelli, A.

    AU - Antonelli, M.

    AU - Bencivenni, G.

    AU - Bologna, G.

    AU - Bossi, F.

    AU - Campana, P.

    AU - Capon, G.

    AU - Chiarella, V.

    AU - Laurelli, P.

    AU - Mannocchi, G.

    AU - Murtas, F.

    AU - Murtas, G. P.

    AU - Passalacqua, L.

    AU - Pepe-Altarelli, M.

    AU - Halley, A. W.

    AU - Lynch, J. G.

    AU - Negus, P.

    AU - O'Shea, V.

    AU - Raine, C.

    AU - Thompson, A. S.

    AU - Wasserbaech, S.

    AU - Cavanaugh, R.

    AU - Dhamotharan, S.

    AU - Geweniger, C.

    AU - Hanke, P.

    AU - Hansper, G.

    AU - Hepp, V.

    AU - Kluge, E. E.

    AU - Putzer, A.

    AU - Sommer, J.

    AU - Tittel, K.

    AU - Werner, S.

    AU - Wunsch, M.

    AU - Beuselinck, R.

    AU - Binnie, D. M.

    AU - Cameron, W.

    AU - Dornan, P. J.

    AU - Girone, M.

    AU - Marinelli, N.

    AU - Sedgbeer, J. K.

    AU - Thompson, J. C.

    AU - Ghete, V. M.

    AU - Girtler, P.

    AU - Kneringer, E.

    AU - Kuhn, D.

    AU - Rudolph, G.

    AU - Bouhova-Thacker, E.

    AU - Bowdery, C. K.

    AU - Finch, A. J.

    AU - Foster, F.

    AU - Hughes, G.

    AU - Jones, R. W L

    AU - Pearson, M. R.

    AU - Robertson, N. A.

    AU - Giehl, I.

    AU - Jakobs, K.

    AU - Kleinknecht, K.

    AU - Quast, G.

    AU - Renk, B.

    AU - Rohne, E.

    AU - Sander, H. G.

    AU - Wachsmuth, H.

    AU - Zeitnitz, C.

    AU - Bonissent, A.

    AU - Carr, J.

    AU - Coyle, P.

    AU - Leroy, O.

    AU - Payre, P.

    AU - Rousseau, D.

    AU - Talby, M.

    AU - Aleppo, M.

    AU - Ragusa, F.

    AU - David, A.

    AU - Dietl, H.

    AU - Ganis, G.

    AU - Hüttmann, K.

    AU - Lütjens, G.

    AU - Mannert, C.

    AU - Männer, W.

    AU - Moser, H. G.

    AU - Settles, R.

    AU - Stenzel, H.

    AU - Wiedenmann, W.

    AU - Wolf, G.

    AU - Boucrot, J.

    AU - Callot, O.

    AU - Davier, M.

    AU - Duflot, L.

    AU - Grivaz, J. F.

    AU - Heusse, Ph

    AU - Jacholkowska, A.

    AU - Lefrançois, J.

    AU - Veillet, J. J.

    AU - Videau, I.

    AU - Yuan, C.

    AU - Bagliesi, G.

    AU - Boccali, T.

    AU - Calderini, G.

    AU - Foà, L.

    AU - Giassi, A.

    AU - Ligabue, F.

    AU - Messineo, A.

    AU - Palla, F.

    AU - Sanguinetti, G.

    AU - Sciabà, A.

    AU - Sguazzoni, G.

    AU - Tenchini, R.

    AU - Venturi, A.

    AU - Verdini, P. G.

    AU - Blair, G. A.

    AU - Cowan, G.

    AU - Green, M. G.

    AU - Medcalf, T.

    AU - Misiejuk, A.

    AU - Strong, J. A.

    AU - Teixeira-Dias, P.

    AU - von Wimmersperg-Toeller, J. H.

    AU - Clifft, R. W.

    AU - Edgecock, T. R.

    AU - Norton, P. R.

    AU - Tomalin, I. R.

    AU - Bloch-Devaux, B.

    AU - Colas, P.

    AU - Emery, S.

    AU - Kozanecki, W.

    AU - Lançon, E.

    AU - Lemaire, M. C.

    AU - Locci, E.

    AU - Perez, P.

    AU - Rander, J.

    AU - Renardy, J. F.

    AU - Roussarie, A.

    AU - Schuller, J. P.

    AU - Schwindling, J.

    AU - Trabelsi, A.

    AU - Vallage, B.

    AU - Konstantinidis, N.

    AU - Litke, A. M.

    AU - Taylor, G.

    AU - Booth, C. N.

    AU - Cartwright, S.

    AU - Combley, F.

    AU - Lehto, M.

    AU - Thompson, L. F.

    AU - Affholderbach, K.

    AU - Böhrer, A.

    AU - Brandt, S.

    AU - Grupen, C.

    AU - Ngac, A.

    AU - Prange, G.

    AU - Sieler, U.

    AU - Giannini, G.

    AU - Rothberg, J.

    AU - Armstrong, S. R.

    AU - Cranmer, K.

    AU - Elmer, P.

    AU - Ferguson, D. P S

    AU - Gao, Y.

    AU - González, S.

    AU - Hayes, O. J.

    AU - Hu, H.

    AU - Jin, S.

    AU - Kile, J.

    AU - McNamara, P. A.

    AU - Nielsen, J.

    AU - Orejudos, W.

    AU - Pan, Y. B.

    AU - Saadi, Y.

    AU - Scott, I. J.

    AU - Walsh, J.

    AU - Wu, S. L.

    AU - Wu, X.

    AU - Zobernig, G.

    PY - 2001/11

    Y1 - 2001/11

    N2 - A measurement of the Michel parameters and the average vτ helicity in τ lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 pb-1 is analysed. The Michel parameters ρl, ξl, (ξδ)l (l = e, μ), and ημ are determined for the leptonic decays, and the chirality parameters ξπ, ξρ, and ξa1 for the hadronic final states. Under the assumptions of e-μ universality and ξπ = ξρ = ξa1, the values ρl = 0.742 ± 0.016, ηl = 0.012 ± 0.026, (ξδ)l = 0.776 ± 0.051, ξl = 0.986 ± 0.074, and ξh = 0.992 ± 0.011 are obtained. No significant deviation is observed from the Standard Model assumption of the V - A structure of the charged weak interaction.

    AB - A measurement of the Michel parameters and the average vτ helicity in τ lepton decays is described. The data was collected with the ALEPH detector at LEP during the years 1991 to 1995. A total integrated luminosity of 155 pb-1 is analysed. The Michel parameters ρl, ξl, (ξδ)l (l = e, μ), and ημ are determined for the leptonic decays, and the chirality parameters ξπ, ξρ, and ξa1 for the hadronic final states. Under the assumptions of e-μ universality and ξπ = ξρ = ξa1, the values ρl = 0.742 ± 0.016, ηl = 0.012 ± 0.026, (ξδ)l = 0.776 ± 0.051, ξl = 0.986 ± 0.074, and ξh = 0.992 ± 0.011 are obtained. No significant deviation is observed from the Standard Model assumption of the V - A structure of the charged weak interaction.

    UR - http://www.scopus.com/inward/record.url?scp=0042366337&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0042366337&partnerID=8YFLogxK

    M3 - Article

    VL - 22

    SP - 217

    EP - 230

    JO - European Physical Journal C

    JF - European Physical Journal C

    SN - 1434-6044

    IS - 2

    ER -