1. Hadronization in semi-inclusive deep-inelastic scattering on nuclei
- Author
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P. Kravchenko, M. Stancari, R. Avakian, T. Hasegawa, E. Nappi, R. Perez-Benito, B. Marianski, C. Hadjidakis, Michael Tytgat, E. Cisbani, Frank Ellinghaus, Arne Vandenbroucke, H. Stenzel, Riccardo Fabbri, Y. Miyachi, E. R. Kinney, L. De Nardo, C. Shearer, B. Seitz, W.-D. Nowak, J.J.M. Steijger, E. C. Aschenauer, P. Lenisa, A. Kisselev, Stephen V. Gliske, X. R. Lu, G. Gapienko, G. Schnell, P. Zupranski, V. Gharibyan, A. Trzcinski, A. Brüll, P. B. van der Nat, H. Böttcher, A. Avetissian, G. Elbakian, P. Di Nezza, L. A. Linden-Levy, A. Rostomyan, J. Stewart, D. Gabbert, L. Rubacek, W. Yu, Klaus Rith, R. Lamb, I. Vilardi, H. E. Jackson, A.R. Reolon, C. Riedl, G. Rosner, Wouter Deconinck, A. Schäfer, Ralf Kaiser, M. Düren, Y. Naryshkin, Andreas Mussgiller, V. Muccifora, L. Lapikás, E. Avetissian, S. Taroian, P. E. Reimer, S. Yaschenko, V. Mexner, M. Hoek, S. Lu, W. Augustyniak, Morgan Murray, C. B. Van Hulse, Shan Wang, S. Frullani, B. Tchuiko, M. Kopytin, Z. Ye, S.E. Rock, Y. Ye, J. Dreschler, M. Varanda, A. Nass, B. Zihlmann, N. Pickert, G. Gavrilov, Y. Imazu, Z. Akopov, C. Bonomo, M. Statera, D. Veretennikov, T. Keri, F. Giordano, A. Airapetian, D. Zeiler, A. Ivanilov, N. Bianchi, C. Vogel, B. Hommez, B. Maiheu, T.-A. Shibata, V. Vikhrov, V. Gapienko, G. Ciullo, M. Demey, F. Stinzing, Y. Van Haarlem, J. Streit, H. P. Blok, L. L. Pappalardo, M. Contalbrigo, Wolfgang Lorenzon, I. Hristova, N. Akopov, Y. Salomatin, Martin Raithel, G. van der Steenhoven, L. Grigoryan, V. Korotkov, V. Shutov, L. Lagamba, Naomi C R Makins, V. Bryzgalov, M. Ehrenfried, R. De Leo, D. Hasch, F. Garibaldi, E. De Sanctis, M. Hartig, A. Fantoni, U. Elschenbroich, G. Hill, M. Negodaev, A. Reischl, G.P. Capitani, S. Yen, A. Hillenbrand, C.A. Miller, D. Reggiani, M. Diefenthaler, M. Capiluppi, P. Liebing, P.F. Dalpiaz, J. G. Rubin, I. Lehmann, D. Ryckbosch, H. Marukyan, A. Borissov, (Astro)-Particles Physics, and Student Lab and Education
- Subjects
Nuclear and High Energy Physics ,Physics::Instrumentation and Detectors ,Hadron ,chemistry.chemical_element ,FOS: Physical sciences ,01 natural sciences ,7. Clean energy ,NO ,High Energy Physics - Experiment ,Nuclear physics ,Neon ,High Energy Physics - Experiment (hep-ex) ,Pion ,0103 physical sciences ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,010306 general physics ,Nuclear Experiment ,Physics ,Mass number ,010308 nuclear & particles physics ,Krypton ,Deep inelastic scattering ,Hadronization ,chemistry ,Deuterium ,High Energy Physics::Experiment ,Atomic physics - Abstract
A series of semi-inclusive deep-inelastic scattering measurements on deuterium, helium, neon, krypton, and xenon targets has been performed in order to study hadronization. The data were collected with the HERMES detector at the DESY laboratory using a 27.6 GeV positron or electron beam. Hadron multiplicities on nucleus A relative to those on the deuteron, R_A^h, are presented for various hadrons (\pi^+, \pi^-, \pi^0, K^+, K^-, p, and \bar{p}) as a function of the virtual-photon energy \nu, the fraction z of this energy transferred to the hadron, the photon virtuality Q^2, and the hadron transverse momentum squared p_t^2. The data reveal a systematic decrease of R_A^h with the mass number A for each hadron type h. Furthermore, R_A^h increases (decreases) with increasing values of \nu (z), increases slightly with increasing Q^2, and is almost independent of p_t^2, except at large values of p_t^2. For pions two-dimensional distributions also are presented. These indicate that the dependences of R_A^{\pi} on \nu and z can largely be described as a dependence on a single variable L_c, which is a combination of \nu and z. The dependence on L_c suggests in which kinematic conditions partonic and hadronic mechanisms may be dominant. The behaviour of R_A^{\pi} at large p_t^2 constitutes tentative evidence for a partonic energy-loss mechanism. The A-dependence of R_A^h is investigated as a function of \nu, z, and of L_c. It approximately follows an A^{\alpha} form with \alpha \approx 0.5 - 0.6., Comment: 33 pages, 12 figures
- Published
- 2007
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