Inclusive production of D$^{\ast\pm}$ mesons in photon-photon collisions at $\sqrt{s}_{\rm ee}=183$ and 189 GeV and a first measurement of $F^\gamma _{2,{\rm c}}$

G. Abbiendi et al.,K. Ackerstaff, G. Alexander,J. Allison, S. Arcelli, S. Asai, D. Axen,G. Azuelos,I. Bailey, E. Barberio, T. Barillari,S. Baumann,T. Behnke,G. Bella,A. Bellerive, S. Bentvelsen,Siegfried Bethke,S T Betts, O. Biebel,A. Biguzzi, O. Boeriu, D. Bonacorsi, M. Boutemeur,S. Braibant,P. Bright-Thomas, L. Brigliadori, P. Capiluppi,D. Chrisman,C. Ciocca,E. Clay,Iuliana Cohen,J. Couchman,C. Couyoumtzelis, M. Cuffiani,S. Dado,S. Dallison,R E Davis, P. Dervan,K. Desch,B. Dienes,M. Donkers, J. Dubbert, E. Duchovni, G. Duckeck, E. Etzion,F. Fabbri,A. Fanfani,Marcello Fanti,L. Feld,P. Ferrari,F. Fiedler,M. Fierro, I. Fleck,A. Frey,Pauline Gagnon, G. Gaycken,C. Geich-Gimbel, G. Giacomelli,P. Giacomelli,D. Glenzinski, Jacques Goldberg, W. Gorn,C. Grandi,Kevin S Graham,Eilam Gross,J. Grunhaus,Csaba Hajdu,M. Hansroul,M. Hapke, K. Harder, A. Harel,M. Harin,M. Hauschild,Richard John Hawkings, G. Herten, A. Hocker, K D Hoffman,R. Howard,P. Igo-Kemenes,K. Ishii, A. Jawahery,H. Jeremie,M. Jimack, P. Jovanovic,Naoko Kanaya, J. Kanzaki,G. Karapetian,D. Karlen,Vakhtang Kartvelishvili,K. Kawagoe, T. Kawamoto, A. Klier,Tetsuo Kobayashi, M. Kobel,M. Kolrep, S. Komamiya, T. Kress,P. Krieger,T. Kuhl,Michael Kupper,P. Kyberd,H. Landsman, D. Lanske, J. Lauber,I. Lawson, D. Lellouch, J. Letts,L. Levinson,R. Liebisch,J. Lillich,C. Littlewood, J G Lu, J. Ludwig, A. Macchiolo,A. Macpherson,W F Mader, Marcello Mannelli, S. Marcellini,G. Martinez, T. Mashimo,J A Mckenna, F. Meijers,P. Mendez-Lorenzo,H. Mes,Irmtraud M Meyer,Aldo Michelini,S. Mihara, G. Mikenberg, W. Mohr,A. Montanari,Takehiro Mori,Kentaro Nagai,I. Nakamura, R. Nisius, F. Odorici,A. Okpara

EUROPEAN PHYSICAL JOURNAL C(2000)

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摘要
The inclusive production of D*(+/-) mesons in photon-photon collisions has been measured using rile OPAL detector at LEP at e(+)e(-) centre-of-mass energies root S-ee of 183 and 189 GeV. The D*(+) mesons are reconstructed in their decay to D(0)pi(+) with the D-0 observed in the two decay modes K(-)pi(+) and K(-)pi(+)pi(-)pi(+) After background subtraction, 100.4 +/- 12.6 (stat) D*(+/-) mesons have been selected in events without observed scattered beam electron ("anti-tagged") and 29.8 +/- 5.9 (stat)D*(+/-) mesons in events where one beam electron is scattered into the detector ("single-tagged"). Direct and single-resolved events are studied separately. Differential cross-sections d sigma/dp(T)(D*) and d sigma/d \eta(D*)\ as functions of the D*+/- transverse momentum p(T)(D*) and pseudorapidity eta(D*) are presented in the kinematic region 2 GeV < p(T)(D*) < 12 GeV and \eta(D*)\ < 1.5 They are compared to next-to-leading order (NLO) perturbative QCD calculations. The total cross-section for the process e(+)e(-) --> e(+)e(-) c (c) over bar where the charm quarks are produced in the collision of two quasi-real photons is measured to be sigma(e(+)e(-) --> e(+)e(-) c (c) over bar) = 963 +/- 110 (stat) +/- 86 (sys) +/- 224 (extrapolation) pb. A first measurement. of the charm structure function F-2.0(gamma), of the photon is performed in the kinematic range 0.0014 < x < 0.87 and 5 GeV2 < Q(2) < 100 GeV2. and the result is compared to a NLO perturbative QCD calculation.
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关键词
structure function,centre of mass,cross section,background subtraction
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