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Measurement of the inclusive D^{*{\pm}}$ production in $\gamma\gamma$ collisions at LEP

A. Heister S. Schael R. Barate 1 R. Bruneliere 1 I. de Bonis 1 D. Decamp 1 C. Goy 1 S. Jezequel 1 J P. Lees 1 F. Martin 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 B. Trocme 1 S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido M. Martinez A. Pacheco H. Ruiz A. Colaleo D. Creanza N. de Filippis 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 Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo T. Barklow O. Buchmuller M. Cattaneo F. Cerutti B. Clerbaux H. Drevermann R W. Forty M. Frank F. Gianotti J B. Hansen J. Harvey D E. Hutchcroft P. Janot B. Jost M. Kado P. Mato A. Moutoussi F. Ranjard L. Rolandi D. Schlatter G. Sguazzoni W. Tejessy F. Teubert A. Valassi I. Videau F. Badaud 2 S. Dessagne 2 Alain Falvard 2 D. Fayolle 2 Pascal Gay 2 J. Jousset 2 B. Michel 2 S. Monteil 2 D. Pallin 2 J M. Pascolo 2 Pascal Perret 2 J D. Hansen J R. Hansen P H. Hansen A. Kraan B S. Nilsson A. Kyriakis C. Markou E. Simopoulou A. Vayaki K. Zachariadou A. Blondel 3 J C. Brient 3 F. Machefert 3 A. Rouge 3 M. Swynghedauw 3 R. Tanaka 3 H. Videau 3 V. Ciulli E. Focardi G. Parrini A. Antonelli M. Antonelli G. Bencivenni F. Bossi G. Capon V. Chiarella P. Laurelli G. Mannocchi G P. Murtas L. Passalacqua J. Kennedy J G. Lynch P. Negus V. O'Shea a S. Thompson S. Wasserbaech R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke V. Hepp E E. Kluge G. Leibenguth A. Putzer H. Stenzel K. Tittel M. Wunsch R. Beuselinck W. Cameron G. Davies P J. Dornan M. Girone R D. Hill N. Marinelli J. Nowell S A. Rutherford J K. Sedgbeer J C. Thompson R. White V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph E. Bouhova-Thacker C K. Bowdery D P. Clarke G. Ellis a J. Finch F. Foster G. Hughes R W L. Jones M R. Pearson N A. Robertson M. Smizanska O. van der Aa C. Delaere V. Lemaitre U. Blumenschein F. Holldorfer K. Jakobs F. Kayser K. Kleinknecht a S. Muller B. Renk H G. Sander S. Schmeling H. Wachsmuth C. Zeitnitz T. Ziegler A. Bonissent 4 P. Coyle 4 C. Curtil 4 A. Ealet 4 D. Fouchez 4 P. Payre 4 A. Tilquin 4 F. Ragusa A. David H. Dietl G. Ganis K. Huttmann G. Lutjens W. Manner H G. Moser R. Settles M. Villegas G. Wolf J. Boucrot 5 O. Callot 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 L. Serin 5 J J. Veillet 5 P. Azzurri G. Bagliesi T. Boccali L. Foa A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciaba P. Spagnolo R. Tenchini A. Venturi P G. Verdini O. Awunor G A. Blair G. Cowan A. Garcia-Bellido M G. Green L T. Jones T. Medcalf A. Misiejuk J A. Strong P. Teixeira-Dias R W. Clifft T R. Edgecock P R. Norton I R. Tomalin J J. Ward B. Bloch-Devaux D. Boumediene P. Colas B. Fabbro E. Lancon M C. Lemaire E. Locci P. Perez J. Rander B. Tuchming B. Vallage N. Konstantinidis a M. Litke G. Taylor C N. Booth S. Cartwright F. Combley P N. Hodgson M H. Lehto L F. Thompson A. Bohrer S. Brandt C. Grupen J. Hess A. Ngac G. Prange C. Borean G. Giannini H. He J. Putz J E. Rothberg S R. Armstrong K. Berkelman K. Cranmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen y B. Pan J H. von Wimmersperg-Toller W. Wiedenmann J. Wu S L. Wu X. Wu G. Zobernig G. Dissertori
Abstract : The inclusive production of D$^{*\pm}$ mesons in two-photon collisions is measured with the ALEPH detector at $\epem$ centre-of-mass energies from 183$\unit{GeV}$ to 209$\unit{GeV}$. A total of $360 \pm 27$ D$^{*\pm}$ meson events were observed from an integrated luminosity of $699\unit{pb^{-1}}$. Contributions from direct and single-resolved processes are separated using the ratio of the transverse momentum $p_{\rmt}^{\rm D^{*\pm}}$ of the D$^{*\pm}$ to the visible invariant mass $W_{\mathrm{vis}}$ of the event. Differential cross sections of D$^{*\pm}$ production as functions of $p_{\rm t}^{\rm D^{*\pm}}$ and the pseudorapidity $|\eta^{\rm D^{*\pm}}| $ are measured in the range $ 2\unit{GeV}/c p_{\rm t}^{\rm D^{*\pm}} 12\unit{GeV}/c $ and $ |\eta^{\rm D^{*\pm}}| 1.5 $. They are compared to next-to-leading order (NLO)perturbative QCD calculations. The extrapolation of the integrated visible D$^{*\pm}$ cross section to the total charm cross section, based on the Pythia Monte Carlo program, yields $ \sigma ( \epem \rightarrow \epem \ccbar ) _ { \sqrt{s} =197\unit{GeV} } = 731 \pm 74_{\mathrm{stat}} \pm 47_{\mathrm{syst}} \pm 157_{\mathrm{extr}} \unit{pb} $.
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Submitted on : Wednesday, July 23, 2003 - 12:05:49 PM
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  • HAL Id : in2p3-00013719, version 1
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A. Heister, S. Schael, R. Barate, R. Bruneliere, I. de Bonis, et al.. Measurement of the inclusive D^{*{\pm}}$ production in $\gamma\gamma$ collisions at LEP. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 28, pp.437-449. ⟨in2p3-00013719⟩

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