/ Experiment-HEP arXiv:0906.2478


Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei


Airapetian, A. (Michigan U.) ; Akopov, N. (Yerevan Phys. Inst.) ; Akopov, Z. (DESY) ; Aschenauer, E.C. (DESY, Zeuthen) ; Augustyniak, W. (Warsaw, Inst. Nucl. Studies) ; Avetissian, A. (Yerevan Phys. Inst.) ; Avetisyan, E. (DESY) ; Ball, B. (Michigan U.) ; Belostotski, S. (St. Petersburg, INP) ; Bianchi, N. (Frascati) ; Blok, H.P. (Vrije U., Amsterdam) ; Bottcher, H. (DESY, Zeuthen) ; Bonomo, C. (Ferrara U.) ; Borissov, A. (DESY) ; Bryzgalov, V. (Serpukhov, IHEP) ; Burns, J. (Glasgow U.) ; Capiluppi, M. (Ferrara U.) ; Capitani, G.P. (Frascati) ; Cisbani, E. (Rome, ISS) ; Ciullo, G. (Ferrara U.) ; Contalbrigo, M. (Ferrara U.) ; Dalpiaz, P.F. (Ferrara U.) ; Deconinck, W. (Michigan U.) ; De Nardo, L. (Michigan U.) ; De Leo, R. (INFN, Bari) ; Dreschler, J. (NIKHEF, Amsterdam) ; De Sanctis, E. (Frascati) ; Diefenthaler, M. (Erlangen - Nuremberg U.) ; Di Nezza, P. (Frascati) ; Duren, M. (Giessen U.) ; Ehrenfried, M. (Giessen U.) ; Elbakian, G. (Yerevan Phys. Inst.) ; Ellinghaus, F. (Colorado U.) ; Fabbri, R. (DESY, Zeuthen) ; Felawka, L. (TRIUMF) ; Fantoni, A. (Frascati) ; Frullani, S. (Rome, ISS) ; Gabbert, D. (DESY, Zeuthen) ; Gapienko, V. (Serpukhov, IHEP) ; Garibaldi, F. (Rome, ISS) ; Gharibyan, V. (Yerevan Phys. Inst.) ; Giordano, F. (Ferrara U.) ; Gliske, S. (Michigan U.) ; Hadjidakis, C. (Frascati) ; Hartig, M. (DESY) ; Hasch, D. (Frascati) ; Hill, G. (Glasgow U.) ; Hillenbrand, A. (DESY, Zeuthen) ; Hoek, M. (Glasgow U.) ; Holler, Y. (DESY) ; Hristova, I. (DESY, Zeuthen) ; Imazu, Y. (Tokyo Inst. Tech.) ; Ivanilov, A. (Serpukhov, IHEP) ; Jackson, H.E. (Argonne) ; Jo, H.S. (Gent U.) ; Jgoun, A. (St. Petersburg, INP) ; Joosten, S. (Gent U.) ; Kaiser, R. (Glasgow U.) ; Karyan, G. (Yerevan Phys. Inst.) ; Keri, T. (Giessen U.) ; Kinney, E. (Colorado U.) ; Kisselev, A. (St. Petersburg, INP) ; Korotkov, V. (Serpukhov, IHEP) ; Kozlov, V. (Lebedev Inst.) ; Kravchenko, P. (St. Petersburg, INP) ; Lagamba, L. (INFN, Bari) ; Lamb, R. (Illinois U., Urbana) ; Lapikas, L. (NIKHEF, Amsterdam) ; Lehmann, I. (Glasgow U.) ; Lenisa, P. (Ferrara U.) ; Linden-Levy, L.A. (Illinois U., Urbana) ; Lopez Ruiz, A. (Gent U.) ; Lorenzon, W. (Michigan U.) ; Lu, X.-G. (DESY, Zeuthen) ; Lu, X.-R. (Tokyo Inst. Tech.) ; Ma, B.-Q. (Peking U.) ; Mahon, D. (Glasgow U.) ; Makins, N.C.R. (Illinois U., Urbana) ; Manaenkov, S.I. (St. Petersburg, INP) ; Manfre, L. (Rome, ISS) ; Mao, Y. (Peking U.) ; Marianski, B. (Warsaw, Inst. Nucl. Studies) ; Martinez de la Ossa, A. (Colorado U.) ; Marukyan, H. (Yerevan Phys. Inst.) ; Miller, C.A. (TRIUMF) ; Miyachi, Y. (Tokyo Inst. Tech.) ; Movsisyan, A. (Yerevan Phys. Inst.) ; Muccifora, V. (Frascati) ; Murray, M. (Glasgow U.) ; Mussgiller, A. (Erlangen - Nuremberg U.) ; Nappi, E. (INFN, Bari) ; Naryshkin, Y. (St. Petersburg, INP) ; Nass, A. (Erlangen - Nuremberg U.) ; Negodaev, M. (DESY, Zeuthen) ; Nowak, W.-D. (DESY, Zeuthen) ; Pappalardo, L.L. (Ferrara U.) ; Perez-Benito, R. (Giessen U.) ; Pickert, N. (Erlangen - Nuremberg U.) ; Raithel, M. (Erlangen - Nuremberg U.) ; Reimer, P.E. (Argonne) ; Reolon, A.R. (Frascati) ; Riedl, C. (DESY, Zeuthen) ; Rith, K. (Erlangen - Nuremberg U.) ; Rosner, G. (Glasgow U.) ; Rostomyan, A. (DESY) ; Rubin, J. (Illinois U., Urbana) ; Ryckbosch, D. (Gent U.) ; Salomatin, Y. (Serpukhov, IHEP) ; Sanftl, F. (Regensburg U.) ; Schafer, A. (Regensburg U.) ; Schnell, G. (Gent U.) ; Schuler, K.P. (DESY) ; Seitz, B. (Glasgow U.) ; Shibata, T.-A. (Tokyo Inst. Tech.) ; Shutov, V. (Dubna, JINR) ; Stancari, M. (Ferrara U.) ; Statera, M. (Ferrara U.) ; Steffens, E. (Erlangen - Nuremberg U.) ; Steijger, J.J.M. (NIKHEF, Amsterdam) ; Stenzel, H. (Giessen U.) ; Stewart, J. (DESY, Zeuthen) ; Stinzing, F. (Erlangen - Nuremberg U.) ; Taroian, S. (Yerevan Phys. Inst.) ; Trzcinski, A. (Warsaw, Inst. Nucl. Studies) ; Tytgat, M. (Gent U.) ; Vandenbroucke, A. (Gent U.) ; van der Nat, P.B. (NIKHEF, Amsterdam) ; Van Haarlem, Y. (Gent U.) ; Van Hulse, C. (Gent U.) ; Veretennikov, D. (St. Petersburg, INP) ; Vikhrov, V. (St. Petersburg, INP) ; Vilardi, I. (INFN, Bari) ; Vogel, C. (Erlangen - Nuremberg U.) ; Wang, S. (Peking U.) ; Yaschenko, S. (Erlangen - Nuremberg U.) ; Ye, H. (Peking U.) ; Ye, Z. (DESY) ; Yu, W. (Giessen U.) ; Zeiler, D. (Erlangen - Nuremberg U.) ; Zihlmann, B. (DESY) ; Zupranski, P. (Warsaw, Inst. Nucl. Studies)

Published in: Phys.Lett.
Year: 2010
Vol.: B684
Page No: 114-118
Pages: 6

Abstract: The first direct measurement of the dependence on target nuclear mass of the average squared transverse momentum <pt**2> of pi+, pi-, and K+ mesons from deep-inelastic lepton scattering is obtained as a function of several kinematic variables. The data were accumulated at the HERMES experiment at DESY, in which the HERA 27.6 GeV lepton beam was scattered off several nuclear gas targets. The average squared transverse momentum was clearly observed to increase with atomic mass number. The effect increases as a function of Q**2 and x and remains constant as a function of both the virtual photon energy nu and the fractional hadron energy z, except that it vanishes as z approaches unity.

Web-Page: http://inspirebeta.net/record/823107/files/Adep.png; http://inspirebeta.net/record/823107/files/ptbroad_superpanel.png

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