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, EC 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, HJ Capitani, GP Carter, P Chumney, P Cisbani, E Court, GR Dalpiaz, PF De Leo, R De Nardo, L De Sanctis, E De Schepper, D Devitsin, E Huberts, PKAD Di Nezza, P Djordjadze, V Duren, M Dvoredsky, A Elbakian, G Ely, J Fantoni, A Fechtchenko, A Ferro-Luzzi, M Fiedler, K Filippone, BW 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, PW Greeniaus, LG Gute, A Haeberli, W Hartig, M Hasch, D Heesbeen, D Heinsius, FH Henoch, M Hertenberger, R Hesselink, WHA Hoffmann-Rothe, P Hofman, G Holler, Y Holt, RJ Hommez, B Hoprich, W Iarygin, G Ihssen, H Iodice, M Izotov, A Jackson, HE Jgoun, A 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, VG Kyle, G Lagamba, L Laziev, A Lenisa, P Lindemann, T Lorenzon, W Makins, NCR Martin, JW Marukyan, H Masoli, F McAndrew, M McIlhany, K McKeown, RD Meissner, F Menden, F Metz, A Meyners, N Mikloukho, O Miller, CA Milner, R Muccifora, V Mussa, R Nagaitsev, A Nappi, E Naryshkin, Y Nass, A Nowak, WD O'Neill, TG Openshaw, R Ouyang, J Owen, BR Pate, SF Potashov, S Potterveld, DH Rakness, G Redwine, R Reggiani, D Reolon, AR 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, KP Schwind, A Seibert, J Shibata, TA Shin, T Shutov, V Simani, MC Simon, A Sinram, K Steffens, E Steijger, JJM Stewart, J Stosslein, U Suetsugu, K Sutter, M Tallini, H Taroian, S Terkulov, A Tessarin, S Thomas, E Tipton, B Tytgat, M Urciuoli, GM van den Brand, JFJ van der Steenhoven, G van de Vyver, R van Hunen, JJ Vetterli, MC Vikhrov, V Vincter, MG Visser, J Volk, E Weiskopf, C Wendland, J Wilbert, J Wise, T Woller, K Yoneyama, S Zohrabian, H
Citation
A. Airapetian et al., Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen, EUR PHY J C, 21(4), 2001, pp. 599-606
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
EUROPEAN PHYSICAL JOURNAL C
ISSN journal
1434-6044 → ACNP
Volume
21
Issue
4
Year of publication
2001
Pages
599 - 606
Database
ISI
SICI code
1434-6044(200107)21:4<599:MOCANP>2.0.ZU;2-O
Abstract
Measurements of the individual multiplicities of pi (+), pi (-) and pi (0) produced in thc deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for ne utral pions, up to z approximate to 0.7, where z is the fraction of the ene rgy transferred in the scattering process carried by the pion. This result (below z approximate to 0.7) is consistent with isospin invariance. The tot al 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.), respe ctively. For fixed z, the measured multiplicities depend oil both the negat ive squared four momentum transfer Q(2) and the Bjorken variable x. The obs erved dependence oil Q(2) agrees qualitatively with the expected behaviour based oil 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.