Study of charm production in Z decays

R. Barate*, D. Decamp, P. Ghez, C. Goy, J. P. Lees, E. Merle, M. N. Minard, B. Pietrzyk, R. Alemany, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, L. Garrido, E. Graugès, A. Juste, M. Martinez, G. Merino, R. MiquelL. M. Mir, A. Pacheco, I. C. Park, I. Riu, 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, U. Becker, G. Boix, M. Cattaneo, F. Cerutti, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, T. C. Greening, A. W. Halley, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, P. Mato, A. Minten, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, M. Schmitt, O. Schneider, P. Spagnolo, W. Tejessy, F. Teubert, I. R. Tomalin, E. Tournefier, A. E. Wright, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, 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, B. Rensch, A. Wäänänen, G. Daskalakis, A. Kyriakis, C. Markou, E. Simopoulou, I. Siotis, A. Vayaki, A. Blondel, G. Bonneaud, J. C. Brient, A. Rougé, M. Rumpf, M. Swynghedauw, M. Verderi, H. Videau, E. Focardi, G. Parrini, K. Zachariadou, R. Cavanaugh, M. Corden, C. Georgiopoulos, A. 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, L. Curtis, J. G. Lynch, P. Negus, V. O'Shea, C. Raine, P. Teixeira-Dias, A. S. Thompson, O. Buchmüller, S. Dhamotharan, C. Geweniger, G. Graefe, 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, S. Goodsir, E. B. Martin, N. Marinelli, A. Sciabà, J. K. Sedgbeer, E. Thomson, M. D. Williams, V. M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, C. K. Bowdery, P. G. Buck, A. J. Finch, F. Foster, G. Hughes, R. W L Jones, N. A. Robertson, M. I. Williams, I. Giehl, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H. G. Sander, H. Wachsmuth, C. Zeitnitz, J. J. Aubert, C. Benchouk, A. Bonissent, J. Carr, P. Coyle, F. Etienne, F. Motsch, P. Payre, D. Rousseau, M. Talby, M. Thulasidas, M. Aleppo, M. Antonelli, F. Ragusa, V. Bäscher, H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, C. Mannert, W. Männer, H. G. Moser, S. Schael, R. Settles, H. Seywerd, H. Stenzel, W. Wiedenmann, G. Wolf, P. Azzurri, J. Boucrot, O. Callot, S. Chen, A. Cordier, M. Davier, L. Duflot, J. F. Grivaz, P. Heusse, A. Jacholkowska, F. Le Diberder, J. Lefrançois, A. M. Lutz, M. H. Schune, J. J. Veillet, I. Videau, D. Zerwas, G. Bagliesi, S. Bettarini, T. Boccali, C. Bozzi, G. Calderini, R. Dell'Orso, I. Ferrante, L. Foà, A. Giassi, A. Gregorio, F. Ligabue, A. Lusiani, P. S. Marrocchesi, A. Messineo, F. Palla, G. Rizzo, G. Sanguinetti, G. Sguazzoni, R. Tenchini, C. Vannini, A. Venturi, P. G. Verdini, G. A. Blair, G. Cowan, M. G. Green, T. Medcalf, J. A. Strong, J. H. von Wimmersperg-Toeller, D. R. Botterill, R. W. Clifft, T. R. Edgecock, P. R. Norton, J. C. Thompson, 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, S. N. Black, J. H. Dann, R. P. Johnson, H. Y. Kim, N. Konstantinidis, A. M. Litke, M. A. McNeil, G. Taylor, C. N. Booth, S. Cartwright, F. Combley, M. S. Kelly, M. Lehto, L. F. Thompson, K. Affholderbach, A. Böhrer, S. Brandt, C. Grupen, J. Hess, C. Koob, A. Misiejuk, G. Prange, U. Sieler, G. Giannini, B. Gobbo, J. Rothberg, S. Wasserbaech, S. R. Armstrong, P. Elmer, D. P S Ferguson, Y. Gao, S. González, O. J. Hayes, H. Hu, S. Jin, P. A. McNamara, J. Nielsen, W. Orejudos, Y. B. Pan, Y. Saadi, I. J. Scott, J. Walsh, S. L. Wu, X. Wu, G. Zobernig

*Corresponding author for this work

Research output: Contribution to journalArticle

111 Scopus citations

Abstract

The production rates of D, Ds, D±, D0/D̄0, D±s, and Λ+c / Λ̄-c in Z → cc̄ decays are measured using the LEP I data sample recorded by the ALEPH detector. The fractional energy spectrum of the D*± is well described as the sum of three contributions: charm hadronisation, b hadron decays and gluon splitting 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(syst.). The average fraction of the beam energy carried by D*± mesons in Z → cc̄ events is measured to be 〈XE(D*±)〉cc̄ = 0.4878 ± 0.0046(stat.) ± 0.0061(syst.). The D*± energy and the hemisphere mass imbalance distributions are simultaneously used to measure the fraction of hadronic Z decays in which a gluon splits to a cc̄ pair: n̄g → cc̄ = (3.23 ± 0.48(stat.) ± 0.53(syst.))%. The ratio of the Vector/(Vector+Pseudoscalar) production rates in charmed mesons is found to be PV = 0.595 ±0.045. The fractional decay width of the Z into cc̄ pairs is determined from the sum of the production rates for various weakly decaying charmed states to be Rc = 0.1738 ± 0.0047(stat.) ± 0.0116(syst.).

Original languageEnglish (US)
Pages (from-to)597-611
Number of pages15
JournalEuropean Physical Journal C
Volume16
Issue number4
DOIs
StatePublished - 2000

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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    Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J. P., Merle, E., Minard, M. N., Pietrzyk, B., Alemany, R., Casado, M. P., Chmeissani, M., Crespo, J. M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Graugès, E., Juste, A., Martinez, M., Merino, G., ... Zobernig, G. (2000). Study of charm production in Z decays. European Physical Journal C, 16(4), 597-611. https://doi.org/10.1007/s100520000421