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Measurement of the spectral functions of axial-vector hadronic $\tau$ decays and determination of $\alpha_{s}(M^2_\tau)$

An analysis based on 124000 selected tau pairs recorded by the ALEPH detector at LEP provides the vector (V) and axial-vector (A) spectral functions of hadronic tau decays together with their total widths. This allows the evaluation of finite energy chiral sum rules that are weighted integrals over...

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Detalles Bibliográficos
Autores principales: Barate, R, Buskulic, Damir, Décamp, D, Ghez, P, Goy, C, Lees, J P, Lucotte, A, Merle, E, Minard, M N, Nief, J Y, Pietrzyk, B, Alemany, R, Boix, G, Casado, M P, Chmeissani, M, Crespo, J M, Delfino, M C, Fernández, E, Fernández-Bosman, M, Garrido, L, Graugès-Pous, E, Juste, A, Martínez, M, Merino, G, Miquel, R, Mir, L M, Park, I C, Pascual, A, Perlas, J A, Riu, I, Sánchez, F, Colaleo, A, Creanza, D, De Palma, M, Gelao, G, Iaselli, Giuseppe, 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, Becker, U, Bright-Thomas, P G, Casper, David William, Cattaneo, M, Ciulli, V, Dissertori, G, Drevermann, H, Forty, Roger W, Frank, M, Hagelberg, R, Hansen, J B, Harvey, J, Janot, P, Jost, B, Lehraus, Ivan, Mato, P, Minten, Adolf G, Moneta, L, Pacheco, A, Pusztaszeri, J F, Ranjard, F, Rolandi, Luigi, Rousseau, D, Schlatter, W D, Schmitt, M, Schneider, O, Tejessy, W, Teubert, F, Tomalin, I R, Wachsmuth, H W, Wagner, A, Ajaltouni, Ziad J, Badaud, F, Chazelle, G, Deschamps, O, Falvard, A, Ferdi, C, Gay, P, Guicheney, C, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, J C, Pallin, D, Perret, P, Podlyski, F, Proriol, J, Rosnet, P, Hansen, J D, Hansen, J R, Hansen, P H, Nilsson, B S, Rensch, B, Wäänänen, A, Daskalakis, G, Kyriakis, A, Markou, C, Simopoulou, Errietta, Siotis, I, Vayaki, Anna, Blondel, A, Bonneaud, G R, Brient, J C, Bourdon, P, Rougé, A, Rumpf, M, Valassi, Andrea, Verderi, M, Videau, H L, Focardi, E, Parrini, G, Zachariadou, K, Corden, M, Georgiopoulos, C H, Jaffe, D E, Antonelli, A, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Cerutti, F, Chiarella, V, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, G P, Passalacqua, L, Pepé-Altarelli, M, Curtis, L, Halley, A W, Lynch, J G, Negus, P, O'Shea, V, Raine, C, Scarr, J M, Smith, K, Teixeira-Dias, P, Thompson, A S, Thomson, E, Buchmüller, O L, Dhamotharan, S, Geweniger, C, Graefe, G, Hanke, P, Hansper, G, Hepp, V, Kluge, E E, Putzer, A, Sommer, J, Tittel, K, Werner, S, Wunsch, M, Beuselinck, R, Binnie, David M, Cameron, W, Dornan, Peter J, Girone, M, Goodsir, S M, Martin, E B, Marinelli, N, Moutoussi, A, Nash, J, Sedgbeer, J K, Spagnolo, P, Williams, M D, Ghete, V M, Girtler, P, Kneringer, E, Kuhn, D, Rudolph, G, Betteridge, A P, Bowdery, C K, Buck, P G, Colrain, P, Crawford, G, Finch, A J, Foster, F, Hughes, G, Jones, R W L, Williams, M I, Giehl, I, Greene, A M, Hoffmann, C, Jakobs, K, Kleinknecht, K, Quast, G, Renk, B, Rohne, E, Sander, H G, Van Gemmeren, P, Zeitnitz, C, Aubert, Jean-Jacques, Benchouk, C, Bonissent, A, Bujosa, G, Carr, J, Coyle, P, Etienne, F, Leroy, O, Motsch, F, Payre, P, Talby, M, Sadouki, A, Thulasidas, M, Trabelsi, K, Aleppo, M, Antonelli, M, Ragusa, F, Berlich, R, Blum, Walter, Büscher, V, Dietl, H, Ganis, G, Kroha, H, Lütjens, G, Mannert, C, Männer, W, Moser, H G, Schael, S, Settles, Ronald, Seywerd, H C J, Stenzel, H, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Chen, S, Cordier, A, Davier, M, Duflot, L, Grivaz, J F, Heusse, P, Höcker, A, Jacholkowska, A, Kim, D W, Le Diberder, F R, Lefrançois, J, Lutz, A M, Schune, M H, Tournefier, E, Veillet, J J, Videau, I, Zerwas, D, Azzurri, P, Bagliesi, G, Batignani, G, Bettarini, S, Boccali, T, Bozzi, C, Calderini, G, Carpinelli, M, Ciocci, M A, Dell'Orso, R, Fantechi, R, Ferrante, I, Foà, L, Forti, F, Giassi, A, Giorgi, M A, Gregorio, A, Ligabue, F, Lusiani, A, Marrocchesi, P S, Messineo, A, Palla, Fabrizio, Rizzo, G, Sanguinetti, G, Sciabà, A, Tenchini, Roberto, Tonelli, G, Vannini, C, Venturi, A, Verdini, P G, Blair, G A, Bryant, L M, Chambers, J T, Green, M G, Medcalf, T, Perrodo, P, Strong, J A, Von Wimmersperg-Töller, J H, Botterill, David R, Clifft, R W, Edgecock, T R, Haywood, S, Norton, P R, Thompson, J C, Wright, A E, Bloch-Devaux, B, Colas, P, Emery, S, Kozanecki, Witold, Lançon, E, Lemaire, M C, Locci, E, Pérez, P, Rander, J, Renardy, J F, Roussarie, A, Schuller, J P, Schwindling, J, Trabelsi, A, Vallage, B, Black, S N, Dann, J H, Johnson, R P, Kim, H Y, Konstantinidis, N P, Litke, A M, McNeil, M A, Taylor, G, Booth, C N, Brew, C A J, Cartwright, S L, Combley, F, Kelly, M S, Lehto, M H, Reeve, J, Thompson, L F, Affholderbach, K, Böhrer, A, Brandt, S, Cowan, G D, Grupen, Claus, Saraiva, P, Smolik, L, Stephan, F, Apollonio, M, Bosisio, L, Della Marina, R, Giannini, G, Gobbo, B, Musolino, G, Rothberg, J E, Wasserbaech, S R, Armstrong, S R, Charles, E, Elmer, P, Ferguson, D P S, Gao, Y, González, S, Greening, T C, Hayes, O J, Hu, H, Jin, S, McNamara, P A, Nachtman, J M, Nielsen, J, Orejudos, W, Pan, Y B, Saadi, Y, Scott, I J, Walsh, J, Wu Sau Lan, Wu, X, Zobernig, G
Lenguaje:eng
Publicado: 1998
Materias:
Acceso en línea:https://dx.doi.org/10.1007/s100520050217
http://cds.cern.ch/record/345764
Descripción
Sumario:An analysis based on 124000 selected tau pairs recorded by the ALEPH detector at LEP provides the vector (V) and axial-vector (A) spectral functions of hadronic tau decays together with their total widths. This allows the evaluation of finite energy chiral sum rules that are weighted integrals over the (V-A) spectral functions. In addition, a precise measurement of alpha_s along with a determination of nonperturbative contributions at the tau mass scale is performed. The experimentally and theoretically most robust determination of alpha_s(M_tau^2) is obtained from the (V+A) fit that yields alpha_s(M_tau^2) = 0.334 +/- 0.022 giving alpha_s(M_Z^2) = 0.1202 +/- 0.0027 after the extrapolation to the mass of the Z boson. The approach of the Operator Product Expansion (OPE) is tested experimentally studying the evolution of the tau hadronic widths to masses smaller than the tau mass.