학술논문

Production of charmed mesons inZ decays
Document Type
Article
Author
Buskulic, D.De Bonis, I.Decamp, D.Ghez, P.Goy, C.Lees, J. -P.Minard, M. -N.Pietrzyk, B.Ariztizabal, F.Comas, P.Crespo, J. M.Efthymiopoulos, I.Fernandez, E.Fernandez-Bosman, M.Gaitan, V.Garrido, Ll.Mattison, T.Orteu, S.Pacheco, A.Padilla, C.Pascual, A.Creanza, D.de Palma, M.Farilla, A.Iaselli, G.Maggi, G.Marinelli, N.Natali, S.Nuzzo, S.Ranieri, A.Raso, G.Romano, F.Ruggieri, F.Selvaggi, G.Silvestris, L.Tempesta, P.Zito, G.Chai, Y.Hu, H.Huang, D.Huang, X.Lin, J.Wang, T.Xie, Y.Xu, D.Xu, R.Zhang, J.Zhang, L.Zhao, W.Bonvicini, G.Boudreau, J.Casper, D.Drevermann, H.Forty, R. W.Ganis, G.Gay, C.Girone, M.Hagelberg, R.Harvey, J.Hilgart, J.Jacobsen, R.Jost, B.Knobloch, J.Lehraus, I.Maggi, M.Markou, C.Martinez, M.Mato, P.Meinhard, H.Minten, A.Miquel, R.Moser, H. -G.Palazzi, P.Pater, J. R.Perlas, J. A.Perrodo, P.Pusztaszeri, J. -F.Ranjard, F.Rolandi, L.Rothberg, J.Ruan, T.Saich, M.Schlatter, D.Schmelling, M.Sefkow, F.Tejessy, W.Tomalin, I. R.Veenhof, R.Wachsmuth, H.Wasserbaech, S.Wiedemann, W.Wildish, T.Witzeling, W.Wotschack, J.Ajaltouni, Z.Bardadin-Otwinowska, M.Barres, A.Boyer, C.Falvard, A.Gay, P.Guicheney, C.Henrard, P.Jousset, J.Michel, B.Montret, J. -C.Pallin, D.Perret, P.Podlyski, F.Proriol, J.Saadi, F.Fearnley, T.Hansen, J. B.Hansen, J. D.Hansen, J. R.Hansen, P. H.Johnson, S. D.Møllerud, R.Nilsson, B. S.Kyriakis, A.Simopoulou, E.Siotis, I.Vayaki, A.Zachariadou, K.Badier, J.Blondel, A.Bonneaud, G.Brient, J. C.Bourdon, B.Fouque, G.Passalacqua, L.Rougé, A.Rumpf, M.Tanaka, R.Verderi, M.Videau, H.Candlin, D. J.Parsons, M. I.Veitch, E.Focardi, E.Moneta, L.Parrini, G.Corden, M.Delfino, M.Georgiopoulos, C.Ikeda, M.Jaffe, D. E.Levinthal, D.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.Pepe=Altarelli, M.Salomone, S.Colrain, P.ten Have, I.Lynch, J. G.Maitland, W.Morton, W. T.Raine, C.Reeves, P.Scarr, J. M.Smith, K.Smith, M. G.Thompson, A. S.Thorn, S.Turnbull, R. M.Brandl, B.Braun, O.Geweniger, C.Graefe, G.Hanke, P.Hepp, V.Karger, C.Kluge, E. E.Maumary, Y.Putzer, A.Rensch, B.Stahl, A.Tittel, K.Wunsch, M.Beuselinck, M.Binnie, D. M.Cameron, W.Cattaneo, M.Colling, D. J.Dornan, P. J.Hassard, J. F.Lieske, N. M.Moutoussi, A.Nash, J.Patton, S.Payne, D. G.Phillips, M. J.San Martin, G.Sedgbeer, J. K.Wright, A. G.Girtler, P.Kuhn, D.Rudolph, G.Vogl, R.Bowdery, C. K.Brodbeck, T. J.Finch, A. J.Foster, F.Hughes, G.Jackson, D.Keemer, N. R.Nuttal, M.Patel, A.Sloan, T.Snow, S. W.Whelan, E. P.Galla, A.Greene, A. M.Kleinknecht, K.Raab, J.Renk, B.Sander, H. -G.Schmidt, H.Walther, S. M.Wanke, R.Wolf, B.Bencheikh, A. M.Benchouk, C.Bonissent, A.Calvet, D.Carr, J.Coyle, P.Diaconu, C.Drinkard, J.Etienne, F.Nicod, D.Payre, P.Roos, L.Rousseau, D.Schwemling, P.Talby, M.Adlung, S.Assmann, R.Bauer, C.Blum, W.Brown, D.Cattaneo, P.Dehning, B.Dietl, H.Dydak, F.Frank, M.Halley, A. W.Jakobs, K.Lauber, J.Lütjens, G.Lutz, G.Männer, G.Richter, R.Schröder, J.Schwarz, A. S.Settles, R.Seywerd, H.Stierlin, H.Stiegler, U.Denis, R. St.Wolf, G.Alemany, R.Boucrot, J.Callot, O.Cordier, A.Davier, M.Duflot, L.Grivaz, J. -F.Heusse, Ph.Janot, P.Kim, D. W.Le Diberder, F.Lefrançois, J.Lutz, A. -M.Musolino, G.Schune, M. -H.Veillet, J. -J.Videau, I.Abbaneo, D.Bagliesi, G.Batignani, G.Bottigli, U.Bozzi, C.Calderini, G.Carpinelli, M.Ciocci, M. A.Ciulli, V.Dell'Orso, R.Ferrante, I.Fidecaro, F.Foà, L.Forti, F.Giassi, A.Giorgi, M. A.Gregorio, A.Ligabue, F.Luisiani, A.Mannelli, E. B.Marrocchesi, P. S.Messineo, A.Palla, F.Rizzo, G.Sanguinetti, G.Spagnolo, P.Steinberger, J.Tenchini, R.Tonelli, G.Triggiani, G.Valassi, A.Vannini, C.Venturi, A.Verdini, P. G.Walsh, J.Betteridge, A. P.Gao, Y.Green, M. G.Johnson, D. L.March, P. V.Medcalf, T.Mir, Ll. M.Quazi, I. S.Strong, J. A.Bertin, V.Botterill, D. R.Clifft, R. W.Edgecock, T. R.Haywood, S.Edwards, M.Norton, P. R.Thompson, J. C.Bloch-Devaux, B.Colas, P.Duarte, H.Emery, S.Kozanecki, W.Lançon, E.Lemaire, M. C.Locci, E.Marx, B.Perez, P.Rander, J.Renardy, J. -F.Rosowsky, A.Roussarie, A.Schuller, J. -P.Schwindling, J.Si Mohand, D.Vallage, B.Johnson, R. P.Litke, A. M.Taylor, G.Wear, J.Babbage, W.Booth, C. N.Buttar, C.Cartwright, S.Combley, F.Dawson, I.Thompson, L. F.Barberio, E.Böhrer, A.Brandt, S.Cowan, G.Grupen, C.Lutters, G.Rivera, F.Schäfer, U.Smolik, L.Bosisio, L.Della Marina, R.Giannini, G.Bobbo, B.Pitis, L.Ragusa, F.Bellantoni, L.Chen, W.Conway, J. S.Feng, Z.Ferguson, D. P. S.Gao, Y. S.Grahl, J.Harton, J. L.Hayes, O. J.Nachtman, J. M.Pan, Y. B.Saadi, Y.Schmitt, M.Scott, I.Sharma, V.Shi, Z. H.Turk, J. D.Walsh, A. M.Weber, F. V.Wu, Sau LanWu, X.Zheng, M.Zobernig, G.
Source
Zeitschrift für Physik C Particles and Fields; March 1994, Vol. 62 Issue: 1 p1-14, 14p
Subject
Language
ISSN
01709739; 14315858
Abstract
The production of charmed mesons  $$\mathop {D^0 }\limits^{( - )} $$ ,D±, andD is studied in a sample of 478,000 hadronicZ decays. The production rates are measured to be $$\begin{gathered} \frac{{\Gamma ({\rm Z} \to D^{* \pm } X)}}{{\Gamma _{had} }} = 0.187 \pm 0.015(\exp .) \pm 0.013(BR), \hfill \\ \frac{{\Gamma ({\rm Z} \to D^ \pm X)}}{{\Gamma _{had} }} = 0.251 \pm 0.026(\exp .) \pm 0.025(BR), \hfill \\ \frac{{\Gamma ({\rm Z} \to \mathop {D^0 }\limits^{( - )} X)}}{{\Gamma _{had} }} = 0.518 \pm 0.052(\exp .) \pm 0.035(BR), \hfill \\ \end{gathered} $$ where the errors from this analysis are separated from those coming from theD branching ratios (BR). TheD momentum distribution is extracted separately for  $$Z \to c\bar c$$ and  $$Z \to b\bar b$$ events with the help of event shape variables. It is consistent with the prediction of the JETSET Monte Carlo program after adjustment of the charm fragmentation function. Constraining the shape of the  $$Z \to b\bar b$$ contribution, the average fraction of the beam energy taken by aD* meson produced in the fragmentation of a charm quark is extracted by a parametric fit to be E>c=0.495±0.011±0.007. Evidence forD**0 (D1(2420)0 and/orD2*(2460)0) production is found in the  $$D^{* \pm } \pi ^ \mp $$ channel, accounting for a fraction (18±5±2)% of allD production. The relative production of vector and pseudoscalar mesons is dicussed, together with the possible effects ofD** production. Thec-quark forward-backwardZ-pole asymmetry is detrmined from that of high momentumD to beAFB0,c=(7.7±4.4)%.