Double-Hadron Leptoproduction in the Nuclear Medium
A. AirapetianRandall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USAН. АкоповYerevan Physics Institute, 375036 Yerevan, ArmeniaZ. AkopovYerevan Physics Institute, 375036 Yerevan, ArmeniaM. AmarianDESY, 15738 Zeuthen, GermanyA. AndrusDepartment of Physics, University of Illinois, Urbana, Illinois 61801-3080, USAE. C. AschenauerW. AugustyniakAndrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, PolandR. AvakianYerevan Physics Institute, 375036 Yerevan, ArmeniaA. AvetissianYerevan Physics Institute, 375036 Yerevan, ArmeniaE. AvetissianIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyP. BaileyDepartment of Physics, University of Illinois, Urbana, Illinois 61801-3080, USAS. BelostotskiPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, RussiaN. BianchiIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyH. P. BlokDepartment of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The NetherlandsH. BöttcherA. BorissovDepartment of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United KingdomA. BorysenkoIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyA. BrüllV. BryzgalovInstitute for High Energy Physics, Protvino, Moscow Region 142281, RussiaM. CapiluppiIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyG. P. CapitaniIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyG. CiulloIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyM. ContalbrigoIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyP.F. DalpiazIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyW. DeconinckRandall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USAR. De LeoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, ItalyM. DemeyNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsL. De NardoDESY, 22603 Hamburg, GermanyE. De SanctisIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyE. DevitsinLebedev Physical Institute, 117924 Moscow, RussiaM. DiefenthalerPhysikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyP. Di NezzaIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyJ. DreschlerNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsM. DürenPhysikalisches Institut, Universität Gießen, 35392 Gießen, GermanyM. EhrenfriedPhysikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyA. Elalaoui-MoulayPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USAG. ElbakianYerevan Physics Institute, 375036 Yerevan, ArmeniaF. EllinghausNuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0390, USAU. ElschenbroichDepartment of Subatomic and Radiation Physics, University of Gent, 9000 Gent, BelgiumR. FabbriNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsA. FantoniIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyL. FelawkaTRIUMF, Vancouver, British Columbia V6T 2A3, CanadaS. FrullaniIstituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, ItalyA. FunelIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyG. GapienkoInstitute for High Energy Physics, Protvino, Moscow Region 142281, RussiaВ. А. ГапиенкоInstitute for High Energy Physics, Protvino, Moscow Region 142281, RussiaF. GaribaldiIstituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, ItalyK. GarrowTRIUMF, Vancouver, British Columbia V6T 2A3, CanadaG. GavrilovDESY, 22603 Hamburg, GermanyV. GharibyanYerevan Physics Institute, 375036 Yerevan, ArmeniaF. GiordanoIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyO. GrebenioukPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, RussiaI. M. GregorK. A. GriffioenNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsH. GulerC. HadjidakisIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyM. HartigPhysikalisches Institut, Universität Gießen, 35392 Gießen, GermanyD. HaschIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyT. HasegawaDepartment of Physics, Tokyo Institute of Technology, Tokyo 152, JapanW.H.A. HesselinkDepartment of Physics and Astronomy, Vrije Universiteit, 1081 HV Amsterdam, The NetherlandsA. HillenbrandPhysikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyM. HoekPhysikalisches Institut, Universität Gießen, 35392 Gießen, GermanyY. HollerB. HommezDepartment of Subatomic and Radiation Physics, University of Gent, 9000 Gent, BelgiumI. HristovaG. IaryginJoint Institute for Nuclear Research, 141980 Dubna, RussiaA. IvanilovInstitute for High Energy Physics, Protvino, Moscow Region 142281, RussiaA. IzotovPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, RussiaH. E. JacksonPhysics Division, Argonne National Laboratory, Argonne, Illinois 60439-4843, USAA. JgounPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, RussiaR. KaiserDepartment of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United KingdomT. KeriPhysikalisches Institut, Universität Gießen, 35392 Gießen, GermanyE. KinneyNuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0390, USAA. KisselevNuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0390, USAT. KobayashiDepartment of Physics, Tokyo Institute of Technology, Tokyo 152, JapanM. KopytinВ. А. КоротковInstitute for High Energy Physics, Protvino, Moscow Region 142281, RussiaВ. КозловLebedev Physical Institute, 117924 Moscow, RussiaBernhard KraußPhysikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyP. KravchenkoPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, RussiaV. G. KrivokhijineJoint Institute for Nuclear Research, 141980 Dubna, RussiaL. LagambaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70124 Bari, ItalyL. LapikásNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsP. LenisaIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyP. LiebingL. A. Linden-LevyDepartment of Physics, University of Illinois, Urbana, Illinois 61801-3080, USAW. LorenzonRandall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1040, USAJ. LuTRIUMF, Vancouver, British Columbia V6T 2A3, CanadaS. LuPhysikalisches Institut, Universität Gießen, 35392 Gießen, GermanyB.-Q. MaSchool of Physics, Peking University, Beijing 100871, ChinaB. MaiheuDepartment of Subatomic and Radiation Physics, University of Gent, 9000 Gent, BelgiumN. C. R. MakinsDepartment of Physics, University of Illinois, Urbana, Illinois 61801-3080, USAY. MaoSchool of Physics, Peking University, Beijing 100871, ChinaB. MariańskiAndrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, PolandH. MarukyanYerevan Physics Institute, 375036 Yerevan, ArmeniaF. MasoliIstituto Nazionale di Fisica Nucleare, Sezione di Ferrara and Dipartimento di Fisica, Università di Ferrara, 44100 Ferrara, ItalyV. MexnerNationaal Instituut voor Kernfysica en Hoge-Energiefysica (NIKHEF), 1009 DB Amsterdam, The NetherlandsN. MeynersT. MichlerPhysikalisches Institut, Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyO. MikloukhoPetersburg Nuclear Physics Institute, St. Petersburg, Gatchina 188350, Russia
2006en
ABI
Annotatsiya
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.
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