APS » Phys. Rev. Lett. » Volume 96 » Issue 16

A. Airapetian,¹⁶ N. Akopov,²⁷ Z. Akopov,²⁷ M. Amarian,^7,27 A. Andrus,¹⁵ E. C. Aschenauer,⁷ W. Augustyniak,²⁶ R. Avakian,²⁷ A. Avetissian,²⁷ E. Avetissian,¹¹ P. Bailey,¹⁵ S. Belostotski,¹⁹ N. Bianchi,¹¹ H. P. Blok,^18,25 H. Böttcher,⁷ A. Borissov,¹⁴ A. Borysenko,¹¹ A. Brüll,²⁸ V. Bryzgalov,²⁰ M. Capiluppi,¹⁰ G. P. Capitani,¹¹ G. Ciullo,¹⁰ M. Contalbrigo,¹⁰ P. F. Dalpiaz,¹⁰ W. Deconinck,¹⁶ R. De Leo,² M. Demey,¹⁸ L. De Nardo,^6,23 E. De Sanctis,¹¹ E. Devitsin,¹⁷ M. Diefenthaler,⁹ P. Di Nezza,¹¹ J. Dreschler,¹⁸ M. Düren,¹³ M. Ehrenfried,⁹ A. Elalaoui-Moulay,¹ G. Elbakian,²⁷ F. Ellinghaus,⁵ U. Elschenbroich,¹² R. Fabbri,¹⁸ A. Fantoni,¹¹ L. Felawka,²³ S. Frullani,²² A. Funel,¹¹ G. Gapienko,²⁰ V. Gapienko,²⁰ F. Garibaldi,²² K. Garrow,²³ G. Gavrilov,^6,23 V. Gharibyan,²⁷ F. Giordano,¹⁰ O. Grebeniouk,¹⁹ I. M. Gregor,⁷ K. Griffioen,¹⁸ H. Guler,⁷ C. Hadjidakis,¹¹ M. Hartig,¹³ D. Hasch,¹¹ T. Hasegawa,²⁴ W. H. Hesselink,^18,25 A. Hillenbrand,⁹ M. Hoek,¹³ Y. Holler,⁶ B. Hommez,¹² I. Hristova,⁷ G. Iarygin,⁸ A. Ivanilov,²⁰ A. Izotov,¹⁹ H. E. Jackson,¹ A. Jgoun,¹⁹ R. Kaiser,¹⁴ T. Keri,¹³ E. Kinney,⁵ A. Kisselev,^5,19 T. Kobayashi,²⁴ M. Kopytin,⁷ V. Korotkov,²⁰ V. Kozlov,¹⁷ B. Krauss,⁹ P. Kravchenko,¹⁹ V. G. Krivokhijine,⁸ L. Lagamba,² L. Lapikás,¹⁸ P. Lenisa,¹⁰ P. Liebing,⁷ L. A. Linden-Levy,¹⁵ W. Lorenzon,¹⁶ J. Lu,²³ S. Lu,¹³ B.-Q. Ma,³ B. Maiheu,¹² N. C. R. Makins,¹⁵ Y. Mao,³ B. Marianski,²⁶ H. Marukyan,²⁷ F. Masoli,¹⁰ V. Mexner,¹⁸ N. Meyners,⁶ T. Michler,⁹ O. Mikloukho,¹⁹ C. A. Miller,²³ Y. Miyachi,²⁴ V. Muccifora,¹¹ M. Murray,¹⁴ A. Nagaitsev,⁸ E. Nappi,² Y. Naryshkin,¹⁹ M. Negodaev,⁷ W.-D. Nowak,⁷ H. Ohsuga,²⁴ A. Osborne,¹⁴ R. Perez-Benito,¹³ N. Pickert,⁹ M. Raithel,⁹ D. Reggiani,⁹ P. E. Reimer,¹ A. Reischl,¹⁸ A. R. Roelon,¹¹ C. Riedl,⁹ K. Rith,⁹ G. Rosner,¹⁴ A. Rostomyan,⁶ L. Rubacek,¹³ J. Rubin,¹⁵ D. Ryckbosch,¹² Y. Salomatin,²⁰ I. Sanjiev,^1,19 I. Savin,⁸ A. Schäfer,²¹ G. Schnell,²⁴ K. P. Schüler,⁶ J. Seele,⁵ R. Seidl,⁹ B. Seitz,¹³ C. Shearer,¹⁴ T.-A. Shibata,²⁴ V. Shutov,⁸ K. Sinram,⁶ M. Stancari,¹⁰ M. Statera,¹⁰ E. Steffens,⁹ J. J. M. Steijger,¹⁸ H. Stenzel,¹³ J. Stewart,⁷ F. Stinzing,⁹ J. Streit,¹³ P. Tait,⁹ H. Tanaka,²⁴ S. Taroian,²⁷ B. Tchuiko,²⁰ A. Terkulov,¹⁷ A. Trzcinski,²⁶ M. Tytgat,¹² A. Vandenbroucke,¹² P. B. van der Nat,¹⁸ G. van der Steenhoven,¹⁸ Y. van Haarlem,¹² D. Veretennikov,¹⁹ V. Vikhrov,¹⁹ C. Vogel,⁹ S. Wang,³ Y. Ye,⁴ Z. Ye,⁶ S. Yen,²³ B. Zihlmann,¹² and P. Zupranski²⁶

(HERMES Collaboration)

¹Physics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USA
²Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, Italy
³School of Physics, Peking University, Beijing 100871, China
⁴Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
⁵Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0390, USA
⁶DESY, 22603 Hamburg, Germany
⁷DESY, 15738 Zeuthen, Germany
⁸Joint Institute for Nuclear Research, 141980 Dubna, Russia
⁹Physikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
¹⁰Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, Italy
¹¹Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
¹²Department of Subatomic and Radiation Physics, University of Gent, 9000 Gent, Belgium
¹³Physikalisches Institut, Universität Gießen, 35392 Gießen, Germany
¹⁴Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
¹⁵Department of Physics, University of Illinois, Urbana, Illinois 61801-3080, USA
¹⁶Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USA
¹⁷Lebedev Physical Institute, 117924 Moscow, Russia
¹⁸Nationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The Netherlands
¹⁹Petersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, Russia
²⁰Institute for High Energy Physics, Protvino, Moscow Region 142281, Russia
²¹Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
²²Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, Italy
²³TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
²⁴Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan
²⁵Department of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The Netherlands
²⁶Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, Poland
²⁷Yerevan Physics Institute, 375036 Yerevan, Armenia
²⁸36 Mizzen Circle, Hampton, Virginia 23664, USA

The first measurements of double-hadron production in deep-inelastic scattering within the nuclear medium were made with the HERMES spectrometer at DESY HERA using a 27.6 GeV positron beam. By comparing data for deuterium, nitrogen, krypton, and xenon nuclei, the influence of the nuclear medium on the ratio of double-hadron to single-hadron yields was investigated. Nuclear effects on the additional hadron are clearly observed, but with little or no difference among nitrogen, krypton, or xenon, and with smaller magnitude than effects seen on previously measured single-hadron multiplicities. The data are compared with models based on partonic energy loss or prehadronic scattering and with a model based on a purely absorptive treatment of the final-state interactions. Thus, the double-hadron ratio provides an additional tool for studying modifications of hadronization in nuclear matter.

©2006 The American Physical Society

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