1. Measurement of the Tau polarisation at LEP
- Author
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Heister, A., Schael, S., Barate, R., Bonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J. -P, Merle, E., Minard, M. -N, Pietrzyk, B., Alemany, R., Bravo, S., Casado, M. P., Chmeissani, M., Crespo, J. M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Graugés, E., Martínez, M., Merino, G., Miquel, R., Mir, L. M., Pacheco, A., Ruiz, H., Colaleo, A., Creanza, D., 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., Buchmuller, 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., Schmitt, M., Schneider, O., Spagnolo, P., Tejessy, W., Teubert, F., Tournefier, E., Ward, J., Wright, A. E., 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., Daskalakis, G., Kyriakis, A., Markou, C., Simopoulou, E., Vayaki, A., Blondel, A., Bonneaud, G., Brient, J. -C, Rougé, A., Rumpf, M., Swynghedauw, M., Verderi, M., Videau, H., Focardi, E., Parrini, G., Zachariadou, K., 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., Chen, S., Davier, M., Duflot, L., Grivaz, J. -F, Heusse, P., Jacholkowska, A., Lefrançois, J., Nikolic, I., Veillet, J. -J, Videau, I., Yuan, C., Bagliesi, G., Boccali, T., Calderini, G., Vitaliano Ciulli, 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., Strong, J. A., Teixeira-Dias, P., 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., Lancon, 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., Misiejuk, A., 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 Iii, P. A., Nielsen, J., Orejudos, W., Pan, Y. B., Saadi, Y., Scott, I. J., Walsh, J., Wu, S. L., Wu, X., Zobernig, G., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), ALEPH, Heister, A, Schael, S, Barate, R, De Bonis, I, Decamp, D, Ghez, P, Goy, C, Lees, Jp, Merle, E, Minard, Nn, Pietrzyk, B, Alemany, R, Bravo, S, Casado, Mp, Chmeissani, M, Crespo, Jm, Fernandez, E, Fernandez Bosman, M, Garrido, L, Grauges, 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, Buchmuller, 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, Luigi, Schlatter, D, Schmitt, M, Schneider, O, Spagnolo, P, Tejessy, W, Teubert, F, Tournefier, E, Ward, J, Wright, Ae, 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, B, Waananen, A, Daskalakis, G, Kyriakis, A, Markou, C, Simopoulou, E, Vayaki, A, Blondel, A, Bonneaud, G, Brient, Jc, Rouge, A, Rumpf, M, Swynghedauw, M, Verderi, M, Videau, H, Focardi, E, Parrini, G, Zachariadou, K, 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, A, 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, N, Ragusa, F, David, A, Dietl, H, Ganis, G, Huttmann, K, Lutjens, G, Mannert, C, Manner, W, Moser, Hg, Settles, R, Stenzel, H, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Chen, S, Davier, M, Duflot, L, Grivaz, Jf, Heusse, P, Jacholkowska, A, Lefrancois, J, Nikolic, I, Veillet, Jj, Videau, I, Yuan, C, Bagliesi, G, Boccali, T, Calderini, G, Ciulli, V, Foa, L, Giassi, A, Ligabue, Franco, Messineo, A, Palla, F, Sanguinetti, G, Sciaba, A, Sguazzoni, G, Tenchini, R, Venturi, A, Verdini, Pc, Blair, Ga, Cowan, G, Green, Mg, Medcalf, T, 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, Lancon, 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, Bohrer, A, Brandt, S, Grupen, C, Misiejuk, A, Ngac, A, Prange, G, Sieler, U, Giannini, G, Rothberg, J, Armstrong, Sr, Cranner, K, Elmer, P, Ferguson, Dp, Gao, Y, Gonzalez, 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, Zobering, G., Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Physics ,Particle physics ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Electron–positron annihilation ,particelle ,FOS: Physical sciences ,Weinberg angle ,Polarization (waves) ,01 natural sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,polarizzazione ,0103 physical sciences ,LEP TAU ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Angular dependence ,High Energy Physics::Experiment ,010306 general physics ,Engineering (miscellaneous) ,Particle Physics - Experiment - Abstract
The polarisation of $\tau$'s produced in Z decay is measured using 160 pb$^{-1}$ of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters ${\cal A}_e = 0.1504 \pm 0.0068 $ and ${\cal A}_{\tau} = 0.1451 \pm 0.0059$ which are consistent with the hypothesis of $e$-$\tau$ universality. Assuming universality, the value ${\cal A}_{e{-}\tau} = 0.1474 \pm 0.0045$ is obtained from which the effective weak mixing angle $\sin^2 {\theta_{\mathrm{W}}^{\mathrm{eff}}} =0.23147 \pm 0.00057 $ is derived., Comment: 52 pages, 30 figures
- Published
- 2001