Investigation of the W and Q2 dependence of charged pion distributions in μp scattering

M. Arneodo, A. Arvidson, J. J. Aubert, B. Badelek, J. Beaufays, C. P. Bee, C. Benchouk, G. Berghoff, I. Bird, D. Blum, E. Böhm, X. de Bouard, F. W. Brasse, H. Braun, C. Broll, S. Brown, H. Brück, H. Calen, J. S. Chima, J. CiborowskiR. Clifft, G. Coignet, F. Combley, J. Coughlan, G. D'Agostini, S. Dahlgren, F. Dengler, I. Derado, T. Dreyer, J. Drees, M. Düren, V. Eckardt, A. Edwards, T. Ernst, G. Eszes, J. Favier, M. I. Ferrero, J. Figiel, W. Flauger, J. Foster, E. Gabathuler, J. Gajewski, R. Gamet, J. Gayler, N. Geddes, P. Giubellino, P. Grafström, F. Grard, J. Haas, E. Hagberg, F. J. Hasert, P. Hayman, P. Heusse, C. Hoppe, M. Jaffré, A. Jacholkowska, F. Janata, G. Jancso, A. S. Johnson, E. M. Kabuss, G. Kellner, V. Korbel, J. Krüger, S. Kullander, U. Landgraf, D. Lanske, J. Loken, K. Long, M. Maire, P. Malecki, A. Manz, S. Maselli, W. Mohr, F. Montanet, H. E. Montgomery, E. Nagy, J. Nassalski, P. R. Norton, F. G. Oakham, A. M. Osborne, C. Pascaud, B. Pawlik, P. Payre, C. Peroni, H. Pessard, J. Pettingale, B. Pietrzyk, B. Pönsgen, M. Pötsch, P. Renton, P. Ribarics, K. Rith, E. Rondio, M. Scheer, A. Schlagböhmer, H. Schiemann, N. Schmitz, M. Schneegans, M. Scholz, T. Schröder, M. Schouten, K. Schultze, T. Sloan, H. E. Stier, M. Studt, G. N. Taylor, J. M. Thénard, J. C. Thompson, A. de la Torre, J. Toth, L. Urban, W. Wallucks, M. Whalley, S. Wheeler, W. S.C. Williams, S. J. Wimpenny, R. Windmolders, G. Wolf

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Abstract

The W and Q2 dependence of the fragmentation functions and of the average multiplicity of charged pions is investigated, using data from the NA9 experiment at the CERN SPS on muon-proton scattering at 280 GeV. A significant increase of pion production with increasing W is observed at fixed Q2, leading to a rise of the average charged pion multiplicity, linear in ln W2, and of the pion fragmentation function in the central region, i.e. at small |xF|. This increase can be understood from the kinematic widening of the cms rapidity range proportional to ln W2 and the observed W independent height of the rapidity distribution. At fixed W, a rise of the average charged pion multiplicity with Q2 is observed. This rise appears to be weaker than that observed for all charged hadrons implying a stronger rise with Q2 for kaons and protons.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalEuropean Physical Journal C
Volume31
Issue number1
DOIs
Publication statusPublished - Mar 1986
Externally publishedYes

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