Double-Hadron Leptoproduction in the Nuclear Medium

G. Ciullo, Tsutomu Kobayashi, C. Riedl, J. Lu, M. Statera, M. Demey, A. Andrus, A. R. Roelon, Alessandra Fantoni, Shan Wang, A. Kisselev, N. Pickert, Martin Raithel, V. Bryzgalov, M. Hoek, H. Marukyan, Y. Naryshkin, L. A. Linden-Levy, P. Tait, A. Borysenko, A. Avetissian, F. Giordano, S. Taroian, M. Hartig, E. R. Kinney, P. Kravchenko, G. Gapienko, M. Contalbrigo, Andrey V. Izotov, G. P. Capitani, Morgan Murray, G. Elbakian, B. Maiheu, M. Negodaev, A. Funel, J. G. Rubin, Riccardo Fabbri, B. Seitz, I.A. Savin, P. Liebing, P. F. Dalpiaz, D. Veretennikov, A. Elalaoui-Moulay, J. Dreschler, K. P. Schüler, Zhenyu Ye, Tetsuya Hasegawa, Hidekazu Tanaka, Ivana Hristova, M. Amarian, L. Felawka, W. Augustyniak, Y. Holler, Hasko Stenzel, P. Zupranski, A. Trzcinski, M. Capiluppi, B. Tchuiko, Y. Salomatin, D. Reggiani, K. Sinram, V. A. Kozlov, V. Shutov, K. A. Griffioen, L. De Nardo, M. Stancari, E. Devitsin, A. Brüll, C. Shearer, P. E. Reimer, P. B. van der Nat, Salvatore Frullani, J. Streit, Dirk Ryckbosch, I. Sanjiev, Wouter Deconinck, G. Schnell, H. E. Jackson, Michael Tytgat, P. Di Nezza, M. Diefenthaler, B. Q. Ma, S. Yen, Andreas Schäfer, A. Ivanilov, Franco Garibaldi, Klaus Rith, A. Nagaitsev, Arne Vandenbroucke, J. Seele, Naomi C R Makins, Valeria Muccifora, I. M. Gregor, Michael Düren, V. A. Korotkov, G. van der Steenhoven, W.H.A. Hesselink, F. Stinzing, T. Keri, B. Krauss, F. Masoli, Ralf Kaiser, A. Reischl, T. A. Shibata, Adel Terkulov, E. C. Aschenauer, C. A. Miller, V. G. Krivokhijine, V. Vikhrov, Z. Akopov, Y. J. Mao, L. Rubacek, Y. X. Ye, C. Vogel, Eugenio Nappi, A. Airapetian, M. Ehrenfried, E. Avetissian, A. Hillenbrand, Wolfgang Lorenzon, P. Bailey, K. Garrow, N. Akopov, G. Rosner, B. Marianski, Frank Ellinghaus, H. Guler, R. De Leo, O. Grebeniouk, B. Zihlmann, A. Rostomyan, V. Mexner, O. Mikloukho, U. Elschenbroich, A. Borissov, Nicola Bianchi, Y. Van Haarlem, V. Gharibyan, T. Michler, Y. Miyachi, G. Gavrilov, L. Lapikás, S. Belostotski, M. Kopytin, Cynthia Marie Hadjidakis, R.O. Avakian, H. Böttcher, N. Meyners, E. De Sanctis, J. J. M. Steijger, E. Steffens, W.-D. Nowak, J. Stewart, R. Perez-Benito, H. P. Blok, R. Seidl, L. Lagamba, H. Ohsuga, A. Osborne, D. Hasch, B. Hommez, P. Lenisa, G. Iarygin, S. Lu, A. Jgoun, V. A. Gapienko

doi:10.48550/arxiv.hep-ex/0510030

Double-Hadron Leptoproduction in the Nuclear Medium

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説明

First measurement of double-hadron production in deep-inelastic scattering has been measured with the HERMES spectrometer at HERA using a 27.6 GeV positron beam with deuterium, nitrogen, krypton and xenon targets. The influence of the nuclear medium on the ratio of double-hadron to single-hadron yields has been investigated. Nuclear effects are clearly observed but with substantially smaller magnitude and reduced $A$-dependence compared to previously measured single-hadron multiplicity ratios. The data are in fair agreement with models based on partonic or pre-hadronic energy loss, while they seem to rule out a pure absorptive treatment of the final state interactions. Thus, the double-hadron ratio provides an additional tool for studying modifications of hadronization in nuclear matter.