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The holographic bubble chamber experiment and the determination of the effective charmed quark mass and theK-factor for hadronic charm production |
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| Authors: | H Cobbaert P R Hobson R Arnold J L Bailly J F Balland M Barth J H Bartley M Boratav F W Bullock M Callichio M Coupland H Drevermann B G Duff O Erriquez M J Esten D Geiregat K Geissler F Grard V P Henri A Herve F F Heymann J Hrubec D C Imrie E Johannsson J Kesteman P Lecoq G J Lush G Maurer M t Muciaccia S Natali S Nuzzo G Neuhofer P Olivier R Roosen F Ruggieri A Taurok S P K Tavernier M C Touboul A M Touchard O R Williams |
| Institution: | 1. Inter-University Institute for High Energies, B-1050, Brussels, Belgium 2. Department of Physics and Astronomy, University College, WC1E6BT, London, UK 4. Centre de Recherches Nucléaires et Université Louis Pasteur, F-67037, Strasbourg, France 5. Université de l'Etat à Mons, B-7000, Mons, Belgium 6. LPNHE, Universités de Paris VI et Paris VII, F-75230, Paris, France 7. Università di Bari, I-70100, Bari, Italy 8. CERN, European Organization for Nuclear Research, CH-1211, Geneva 23, Switzerland 9. Institut für Hochenergiephysik der Oesterreichischen Akademie der Wissenschaften, A-1050, Wien, Austria |
| Abstract: | In the first holographic bubble chamber experiment — the HOBC experiment — we have accumulated a total of 40000 holograms with particle interactions. We have determined the total charm pair cross section inpN collisions to be 23.3 ?7.7 +10 μb and 3.6 ?1.7 +2.3 μb for 360 and 200 GeV/c incident protons respectively. We have assumed a linear dependence of the cross section on the atomic number of the target. This experiment has demonstrated the feasibility of holographic recording in small bubble chambers. Assuming that the charm cross section can be described by the standard QCD factorized expression with gluon fusion and quark-antiquark annihilation, we have used our measured charm cross sections with other measurements to determine the effective charmed quark mass to be 1.8 ?0.35 +0.25 GeV/c2. TheK factor, which describes the importance of the higher order corrections, is calculated to be 9.8 ?6.9 +12.5 (See noted added in proof.) |
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