Measurement of inclusive and dijet D∗ meson cross sections in photoproduction at HERA

oleh: H1 Collaboration, F. D. Aaron, C. Alexa, V. Andreev, S. Backovic, A. Baghdasaryan, S. Baghdasaryan, E. Barrelet, W. Bartel, K. Begzsuren, A. Belousov, P. Belov, J. C. Bizot, M.-O. Boenig, V. Boudry, I. Bozovic-Jelisavcic, J. Bracinik, G. Brandt, M. Brinkmann, V. Brisson, D. Britzger, D. Bruncko, A. Bunyatyan, G. Buschhorn, L. Bystritskaya, A. J. Campbell, K. B. Cantun Avila, F. Ceccopieri, K. Cerny, V. Cerny, V. Chekelian, J. G. Contreras, J. A. Coughlan, J. Cvach, J. B. Dainton, K. Daum, B. Delcourt, J. Delvax, E. A. De Wolf, C. Diaconu, M. Dobre, V. Dodonov, A. Dossanov, A. Dubak, G. Eckerlin, S. Egli, A. Eliseev, E. Elsen, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, D.-J. Fischer, M. Fleischer, A. Fomenko, E. Gabathuler, J. Gayler, S. Ghazaryan, A. Glazov, L. Goerlich, N. Gogitidze, M. Gouzevitch, C. Grab, A. Grebenyuk, T. Greenshaw, G. Grindhammer, S. Habib, D. Haidt, C. Helebrant, R. C. W. Henderson, E. Hennekemper, H. Henschel, M. Herbst, G. Herrera, M. Hildebrandt, K. H. Hiller, D. Hoffmann, R. Horisberger, T. Hreus, F. Huber, M. Jacquet, X. Janssen, L. Jönsson, A. W. Jung, H. Jung, M. Kapichine, I. R. Kenyon, C. Kiesling, M. Klein, C. Kleinwort, T. Kluge, R. Kogler, P. Kostka, M. Krämer, J. Kretzschmar, K. Krüger, M. P. J. Landon, W. Lange, G. Laštovička-Medin, P. Laycock, A. Lebedev, V. Lendermann, S. Levonian, K. Lipka, B. List, J. List, R. Lopez-Fernandez, V. Lubimov, A. Makankine, E. Malinovski, H.-U. Martyn, S. J. Maxfield, A. Mehta, A. B. Meyer, H. Meyer, J. Meyer, S. Mikocki, I. Milcewicz-Mika, F. Moreau, A. Morozov, J. V. Morris, M. Mudrinic, K. Müller, Th. Naumann, P. R. Newman, C. Niebuhr, D. Nikitin, G. Nowak, K. Nowak, J. E. Olsson, D. Ozerov, P. Pahl, V. Palichik, I. Panagoulias, M. Pandurovic, Th. Papadopoulou, C. Pascaud, G. D. Patel, E. Perez, A. Petrukhin, I. Picuric, S. Piec, H. Pirumov, D. Pitzl, R. Plačakytė, B. Pokorny, R. Polifka, B. Povh, V. Radescu, N. Raicevic, T. Ravdandorj, P. Reimer, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, M. Rotaru, J. E. Ruiz Tabasco, S. Rusakov, D. Šálek, D. P. C. Sankey, M. Sauter, E. Sauvan, S. Schmitt, L. Schoeffel, A. Schöning, H.-C. Schultz-Coulon, F. Sefkow, L. N. Shtarkov, S. Shushkevich, T. Sloan, I. Smiljanic, Y. Soloviev, P. Sopicki, D. South, V. Spaskov, A. Specka, Z. Staykova, M. Steder, B. Stella, G. Stoicea, U. Straumann, T. Sykora, P. D. Thompson, T. H. Tran, D. Traynor, P. Truöl, I. Tsakov, B. Tseepeldorj, J. Turnau, K. Urban, A. Valkárová, C. Vallée, P. Van Mechelen, Y. Vazdik, D. Wegener, E. Wünsch, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, H. Zohrabyan, F. Zomer

Format: Article
Diterbitkan: SpringerOpen 2012-05-01

Deskripsi

Abstract The inclusive photoproduction of D ∗ mesons and of D ∗-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q 2<2 GeV2 and photon–proton centre-of-mass energies of 100<W γp<285 GeV. Inclusive D ∗ meson differential cross sections are measured for central rapidities |η(D ∗)|<1.5 and transverse momenta p T(D ∗)>1.8 GeV. The heavy quark production process is further investigated in events with at least two jets with transverse momentum p T(jet)>3.5 GeV each, one containing the D ∗ meson. Differential cross sections for D ∗-tagged dijet production and for correlations between the jets are measured in the range |η(D ∗)|<1.5 and p T(D ∗)>2.1 GeV. The results are compared with predictions from Monte Carlo simulations and next-to-leading order perturbative QCD calculations.