Study of charm production in Z decays

Authors
Barate, R Decamp, D Ghez, P Goy, C Lees, JP Merle, E Minard, MN Pietrzyk, B Alemany, R Casado, MP Chmeissani, M Crespo, JM Fernandez, E Fernandez-Bosman, M Garrido, L Grauges, E Juste, A Martinez, M Merino, G Miquel, R Mir, LM Pacheco, A Park, IC Riu, I 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 Becker, U Boix, G Cattaneo, M Cerutti, F Ciulli, V Dissertori, G Drevermann, H Forty, RW Frank, M Greening, TC Halley, AW Hansen, JB Harvey, J Janot, P Jost, B Lehraus, I Leroy, O Mato, P Minten, A Moutoussi, A Ranjard, F Rolandi, L Schlatter, D Schmitt, M Schneider, O Spagnolo, P Tejessy, W Teubert, F Tomalin, IR Tournefier, E Wright, AE Ajaltouni, Z Badaud, F Chazelle, G Deschamps, O Falvard, A Ferdi, C Gay, P Guicheney, C Henrard, P Jousset, J Michel, B Monteil, S Montret, JC Pallin, D Perret, P Podlyski, F Hansen, JD Hansen, JR Hansen, PH Nilsson, BS Rensch, B Waananen, A Daskalakis, G Kyriakis, A Markou, C Simopoulou, E Siotis, I Vayaki, A Blondel, A Bonneaud, G Brient, JC Rouge, A Rumpf, M Swynghedauw, M Verderi, M Videau, H Focardi, E Parrini, G Zachariadou, K Cavanaugh, R Corden, M Georgiopoulos, C Antonelli, A 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 Curtis, L Lynch, JG Negus, P O'Shea, V Raine, C Teixeira-Dias, P Thompson, AS Buchmuller, O Dhamotharan, S Geweniger, C Graefe, G 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 Goodsir, S Martin, EB Marinelli, N Sciaba, A Sedgbeer, JK Thomson, E Williams, MD Ghete, VM Girtler, P Kneringer, E Kuhn, D Rudolph, G Bowdery, CK Buck, PG Finch, AJ Foster, F Hughes, G Jones, RWL Robertson, NA Williams, MI Giehl, I Jakobs, K Kleinknecht, K Quast, G Renk, B Rohne, E Sander, HG Wachsmuth, H Zeitnitz, C Aubert, JJ Benchouk, C Bonissent, A Carr, J Coyle, P Etienne, F Motsch, F Payre, P Rousseau, D Talby, M Thulasidas, M Aleppo, M Antonelli, M Ragusa, F Buscher, V Dietl, H Ganis, G Huttmann, K Lutjens, G Mannert, C Manner, W Moser, HG Schael, S Settles, R Seywerd, H Stenzel, H Wiedenmann, W Wolf, G Azzurri, P Boucrot, J Callot, O Chen, S Cordier, A Davier, M Duflot, L Grivaz, JF Heusse, P Jacholkowska, A Le Diberder, F Lefrancois, J Lutz, AM Schune, MH Veillet, JJ Videau, I Zerwas, D Bagliesi, G Bettarini, S Boccali, T Bozzi, C Calderini, G Dell'Orso, R Ferrante, I Foa, L Giassi, A Gregorio, A Ligabue, F Lusiani, A Marrocchesi, PS Messineo, A Palla, F Rizzo, G Sanguinetti, G Sguazzoni, G Tenchini, R Vannini, C Venturi, A Verdini, PG Blair, GA Cowan, G Green, MG Medcalf, T Strong, JA von Wimmersperg-Toeller, JH Botterill, DR Clifft, RW Edgecock, TR Norton, PR Thompson, JC 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 Black, SN Dann, JH Johnson, RP Kim, HY Konstantinidis, N Litke, AM McNeil, MA Taylor, G Booth, CN Cartwright, S Combley, F Kelly, MS Lehto, H Thompson, LF Affholderbach, K Bohrer, A Brandt, S Grupen, C Hess, J Koob, C Misiejuk, A Prange, G Sieler, U Giannini, G Gobbo, B Rothberg, J Wasserbaech, S Armstrong, SR Elmer, P Ferguson, DPS Gao, Y Gonzalez, S Hayes, OJ Hu, H Jin, S McNamara, PA Nielsen, J Orejudos, W Pan, YB Saadi, Y Scott, IJ Walsh, J Wu, SL Wu, X Zobernig, G
Citation
R. Barate et al., Study of charm production in Z decays, EUR PHY J C, 16(4), 2000, pp. 597-611
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
16
Issue
4
Year of publication
2000
Pages
597 - 611
Database
ISI
SICI code
1434-6044(200009)16:4<597:SOCPIZ>2.0.ZU;2-J
Abstract
The production rates of D*+/- D-s(*+/-), D+/-, D-0/(D) over bar(0), D-s(+/- ), and Lambda(c)(+)/<(Lambda)over bar>(-)(c) in Z --> c (c) over bar decays are measured using the LEP I data sample recorded by the ALEPH detector. T he fractional energy spectrum of the D*+/- is well described as the sum of three contributions: charm hadronisation, b hadron decays and gluon splitti ng into a pair of heavy quarks. The probability for a c quark to hadronise into a D*+ is found to be f(c --> D*+) = 0.233 +/- 0.010(stat.) +/- 0.011(s yst.). The average fraction of the beam energy carried by D*+/- mesons in Z --> c (c) over bar events is measured to be (X-E(D*+/-))(c (c) over bar) = 0.4878 +/- 0.0046(stat.) +/- 0.0061(syst.). The D*+/- energy and the hemis phere mass imbalance distributions are simultaneously used to measure the f raction of hadronic Z decays in which a gluon splits to a c (c) over bar pa ir: (n) over bar(g --> c (c) over bar) = (3.23 +/- 0.48(stat.) +/- 0.53(sys t.))%. The ratio of the Vector/(Vector+Pseudoscalar) production rates in ch armed mesons is found to be P-V = 0.595 +/- 0.045. The fractional decay wid th of the Z into cc pairs is determined from the sum of the production rate s for various weakly decaying charmed states to be R-c = 0.1738 +/- 0.0047( stat.) +/- 0.0116(syst.).