D-meson Production From 400 Gev/c P-p Interactions Evidence For Leading Di-quarks

Aguilarbenitez, M.; W. W. M.,; Bailly, J. L.; Banerjee, S.; Bartl, W.; Begalli, M.; Beilliere, P.; Bizzarri, R.; Briand, H.; Canale, V.; Caso, C.; Castelli, E.; Checchia, P.; Chliapnikov, P. V.; Colino, N.; Colwill, S. J.; Contri, R.; Crennell, D.; Deangelis, A.; Debilly, L.; Defoix, C.; Dimarco, R.; Dicapua, E.; Diezhedo, F.; Dolbeau, J.; Dumarchez, J.; Eriksson, M.; Falciano, S.; Fernandez, C.; Fisher, C.; Fisyak, Y. V.; Fontanelli, F.; Frey, J. R.; Ganguli, S. N.; Gasparini, Ugo; Gensch, U.; Gentile, S.; Gibaut, D. B.; Goshaw, A. T.; Grard, F.; Gurtu, A.; Hamatsu, R.; Haupt, L.; Hellman, S.; Hernandez, J. J.; Holmgren, S. O.; Houlden, M.; Hrubec, J.; Hughes, P.; Huss, D.; Iga, Y.; Iori, M.; Jegham, E.; Johansson, K. E.; Josa, M. I.; Kalelkar, M.; Kistenev, E. P.; Kitamura, S.; Knauss, D.; Kniazev, V. V.; Kowald, W.; Kuhn, D.; Laloum, M.; Legros, P.; Leutz, H.; Lyons, L.; Macdermott, M.; Mason, P.; Mazzucato, M.; Michalon, A.; Michalonmentzer, M. E.; Moa, T.; Monge, R.; Montanet, L.; Naumann, T.; Neuhofer, G.; Nguyen, H. K.; Nilsson, S.; Nowak, H.; Oshima, N.; Otter, G.; Ouared, R.; Comellas, J. P.; Patel, G.; Pernicka, M.; Pilette, P.; Piredda, G.; Plano, R.; Poppleton, A.; Poropat, P.; Raghavan, R.; Reucroft, S.; Roberts, K.; Robertson, W. J.; Rohringer, H.; Roth, A.; Salicio, J. M.; Schulte, R.; Sellden, B.; Sessa, M.; Squarcia, S.; Shankar, K.; Stammer, P.; Stopchenko, V. A.; Stuczinski, W.; Subramanian, A.; Sudhakar, K.; Takahashi, K.; Touboul, M. C.; Trevisan, U.; Troncon, C.; Tsurugai, T.; Vlasov, E. V.; Vilain, P.; Voltolini, C.; Vonck, B.; Walker, W. D.; Wild, C. F.; Zumerle, Gianni

doi:10.1016/0370-2693(88)90103-7

Results of fitting the differential distributions in xF and pT2 of D mesons produced in 400 GeV/c p-p interactions to the form d2σ dxFdpT2∝(1-xF)n exp[-(pT2/〈pT 2〉 )] are discussed. The D+ distribution is found to be relatively hard [n=3.1±0.8〈Pt2〉=1.32±0.27 (GeV/c)2] and the D̄0 distribution relatively soft [n=8.1±1.9,〈pT2〉=0.62±0.14 (GeV/c)2] compared to the average for all D's [n=4.9±0.5,〈pT2〉=0.99±0.10 (GeV/c)2]. It is suggested that these distributions could reflect contribution of leading di-quarks in pp collisions. Comparison is made with evidence for leading quarks in charm production in 360 GeV/cπ-p interactions. © 1988.