Rapid communications in experimental high-energy physics
Photoproduction of D∗± mesons in electron-proton collisions at HERA

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Abstract

At the electron-proton collider HERA the inclusive D∗± meson photoproduction cross section has been measured with the H1 detector in two different, but partly overlapping, kinematical regions. For the first, where 〈Wγp〉 ≈ 200 GeV and Q2 < 0.01 GeV2, the result is σ(γp → ccX) = (13.2 ± 2.2−1.7 −4.8+2.1 +9.9) μb. The second measurement for Q2 < 4 GeV2 yields σ(γp → ccX) = (9.3 ± 2.1−1.8 −3.2+1.9 +6.9) μb at 〈Wγp〉 ≈ 142 GeV and σ(γp → ccX) = (20.6 ± 5.5−3.9 −7.2+4.3 +15.4 μb at 〈Wγp〉 ≈ 230 GeV, respectively. The third error accounts for an additional uncertainty due to the proton and photon parton density parametrizations. Differential cross sections are presented as a function of the D∗± transverse momentum and rapidity. The results compare reasonably well with next-to-leading order QCD calculations. Evidence for diffractive photoproduction of charm quarks is presented.

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    Supported by the Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, FRG, under contract numbers 6AC17P, 6AC47P, 6DO57I, 6HH17P, 6HH27I, 6HD17I, 6HD27I, 6KI17P, 6MP17I, and 6WT87P.

    5

    Supported by the UK Particle Physics and Astronomy Research Council, and formerly by the UK Science and Engineering Research Council.

    6

    Supported by FNRS-NFWO, IISN-IIKW.

    7

    Supported by the Polish State Committee for Scientific Research, grant nos. 115/E-743/SPUB/P03/109/95 and 2 P03B 244 08p01, and Stiftung für Deutsch-Polnische Zusammenarbeit, project no.506/92.

    8

    Supported in part by USDOE grant DE F603 91ER40674.

    9

    Supported by the Deutsche Forschungsgemeinschaft.

    10

    Supported by the Swedish Natural Science Research Council.

    11

    Supported by GA ČR, grant no. 202/93/2423, GA AV ČR, grant no. 19095 and GA UK, grant no. 342.

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    Supported by the Swiss National Science Foundation.

    1

    Visitor from Yerevan Phys. Inst., Armenia.

    3

    Deceased.

    2

    On leave from LBL, Berkeley, USA.

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