/ Experiment-HEP hep-ex/0104004


Multiplicity of charged and neutral pions in deep inelastic scattering of 27.5-GeV positrons on hydrogen


Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Amarian, M. ; Arrington, J. ; Aschenauer, E.C. ; Avakian, H. ; Avakian, R. ; Avetisian, A. ; Avetisian, E. ; Bailey, P. ; Bains, B. ; Baumgarten, C. ; Beckmann, M. ; Belostotski, S. ; Bernreuther, S. ; Bianchi, N. ; Bottcher, H. ; Borissov, A. ; Bouwhuis, M. ; Brack, J. ; Brauksiepe, S. ; Braun, B. ; Bruckner, W. ; Brull, A. ; Budz, P. ; Bulten, H.J. ; Capitani, G.P. ; Carter, P. ; Chumney, Pamela R.K. ; Cisbani, E. ; Court, G.R. ; Dalpiaz, P.F. ; De Leo, R. ; De Nardo, L. ; De Sanctis, E. ; De Schepper, D. ; Devitsin, E. ; de Witt Huberts, P.K.A. ; Di Nezza, P. ; Djordjadze, V. ; Duren, M. ; Dvoredsky, A. ; Elbakian, G. ; Ely, J. ; Fantoni, A. ; Fechtchenko, A. ; Ferro-Luzzi, M. ; Fiedler, K. ; Filippone, B.W. ; Fischer, H. ; Fox, B. ; Franz, J. ; Frullani, S. ; Garber, Y. ; Garibaldi, F. ; Garutti, E. ; Gavrilov, G. ; Gharibian, V. ; Golendukhin, A. ; Graw, G. ; Grebeniouk, O. ; Green, P.W. ; Greeniaus, L.G. ; Gute, A. ; Haeberli, W. ; Hartig, M. ; Hasch, D. ; Heesbeen, D. ; Heinsius, F.H. ; Henoch, M. ; Hertenberger, R. ; Hesselink, W.H.A. ; Hoffmann-Rothe, P. ; Hofman, G. ; Holler, Y. ; Holt, R.J. ; Hommez, B. ; Hoprich, W. ; Iarygin, G. ; Ihssen, H. ; Iodice, M. ; Izotov, A. ; Jackson, H.E. ; Jgoun, A. ; Kaiser, R. ; Kanesaka, J. ; Kinney, E. ; Kisselev, A. ; Kitching, P. ; Kobayashi, H. ; Koch, N. ; Konigsmann, Kay ; Kolster, H. ; Korotkov, V. ; Kotik, E. ; Kozlov, V. ; Krivokhijine, V.G. ; Kyle, G. ; Lagamba, L. ; Laziev, A. ; Lenisa, P. ; Lindemann, T. ; Lorenzon, W. ; Makins, N.C.R. ; Martin, J.W. ; Marukyan, H. ; Masoli, F. ; McAndrew, M. ; McIlhany, Kevin L. ; McKeown, R.D. ; Meissner, F. ; Menden, F. ; Metz, A. ; Meyners, N. ; Mikloukho, O. ; Miller, C.A. ; Milner, R. ; Muccifora, V. ; Mussa, R. ; Nagaitsev, A. ; Nappi, E. ; Naryshkin, Y. ; Nass, A. ; Nowak, W.D. ; O'Neill, T.G. ; Openshaw, R. ; Ouyang, J. ; Owen, B.R. ; Pate, S.F. ; Potashov, S. ; Potterveld, David H. ; Rakness, G. ; Redwine, R. ; Reggiani, D. ; Reolon, A.R. ; Ristinen, R. ; Rith, K. ; Robinson, D. ; Rostomyan, A. ; Ruh, M. ; Ryckbosch, D. ; Sakemi, Y. ; Sato, F. ; Savin, Igor A. ; Scarlett, C. ; Schafer, A. ; Schill, C. ; Schmidt, F. ; Schmitt, M. ; Schnell, G. ; Schuler, K.P. ; Schwind, A. ; Seibert, J. ; Shibata, T.A. ; Shin, T. ; Shutov, V. ; Simani, M.C. ; Simon, A. ; Sinram, K. ; Steffens, E. ; Steijger, J.J.M. ; Stewart, J. ; Stosslein, U. ; Suetsugu, K. ; Sutter, M. ; Tallini, H. ; Taroian, S. ; Terkulov, A. ; Tessarin, S. ; Thomas, E. ; Tipton, B. ; Tytgat, M. ; Urciuoli, G.M. ; van den Brand, J.F.J. ; van der Steenhoven, G. ; van de Vyver, R. ; van Hunen, J.J. ; Vetterli, M.C. ; Vikhrov, V. ; Vincter, M.G. ; Visser, J. ; Volk, E. ; Weiskopf, C. ; Wendland, J. ; Wilbert, J. ; Wise, T. ; Woller, K. ; Yoneyama, S. ; Zohrabian, H.

Published in: Eur.Phys.J.
Year: 2001
Vol.: C21
Page No: 599-606
Pages: 10

Abstract: Measurements of the individual multiplicities of pi+, pi- and pi0 produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to approximately z= 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z= 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 +/- 0.01 (stat.) +/- 0.08 (syst.) and 0.26 +/- 0.01 (stat.) +/- 0.04 (syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q^2 and the Bjorken variable x. The observed dependence on Q^2 agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on x is consistent with that of previous data after corrections have been made for the expected Q^2-dependence.

Web-Page: http://www.adsabs.harvard.edu/abs/2001EPJC...21..599H; http://alice.cern.ch/format/showfull?sysnb=2247966; http://publish.edpsciences.org/abstract/EPJC/V21/P599; http://link.springer.de/link/service/journals/10052/bibs/1021004/10210599.htm; http://durpdg.dur.ac.uk/cgi-hepdata/hepreac/4599950

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