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

Authors :
Airapetian, A.
Akopov, N.
Akopov, Z.
Amarian, M.
Arrington, J.
Aschenauer, E.C.
Avakian, H.
Avakian, R.
Avetissian, A.
Avetissian, 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, P.
Cisbani, E.
Court, G.R.
Dalpiaz, P.F.
De Leo, R.
De Nardo, L.
De Sanctis, E.
De Schepper, D.
Devitsin, E.
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.
Gharibyan, 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.
Iarygi, G.
Ihssen, H.
Iodice, M.
Iotov, A.
Jackson, H.E.
Kaiser, R.
Kanesaka, J.
Kinney, E.
Kisselev, A.
Kitching, P.
Kobayashi, H.
Koch, N.
Konigsmann, K.
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, K.
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, D.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, I.
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 der 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.
Publication Year :
2001
Publisher :
Springer-Verlag, 2001.

Abstract

Measurements of the individual multiplicities of pi /sup +/, pi /sup -/ and pi /sup 0/ 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 z approximately= 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z approximately= 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 +or- 0.01(stat.) +or- 0.08 (syst.) and 0.26 +or- 0.01(stat.) +or- 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q/sup 2/ and the Bjorken variable x. The observed dependence on Q/sup 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/sup 2/-dependence.

Subjects

Subjects :
High Energy Physics::Experiment
Nuclear Experiment
QC

Details

Language :
English
ISSN :
14346044
Database :
OpenAIRE
Accession number :
edsair.core.ac.uk....1edc812ac9eb7d35cb60e6085cd68256

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