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

Airapetian, A. and Carter, P. and Dvoredsky, A. and Filippone, B. W. and McIlhany, K. and McKeown, R. D. and Tipton, B. (2001) Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen. European Physical Journal C, 21 (4). pp. 599-606. ISSN 1434-6044. https://resolver.caltech.edu/CaltechAUTHORS:20170508-140707047

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Abstract

Measurements of the individual multiplicities of π^+, π^− and π^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≈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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s100520100765DOIArticle
http://link.springer.com/article/10.1007%2Fs100520100765PublisherArticle
https://arxiv.org/abs/hep-ex/0104004arXivDiscussion Paper
Additional Information:© 2001 Springer-Verlag Berlin Heidelberg / Società Italiana di Fisica. Received: 2 April 2001; Revised version: 27 June 2001; Published online: 7 September. We thank M. Greco, G. Kramer, and B. Pötter for useful discussions on fragmentation functions. We gratefully acknowledge the DESY management for its support and the staffs at DESY and the collaborating institutions for their significant effort. This work was supported by the Fund for Scientific Research-Flanders (FWO) of Belgium; the Natural Sciences and Engineering Research Council of Canada; the INTAS, HCM and TMR contributions from the European Community; the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF), the Deutscher Akademischer Austauschdienst (DAAD); the Italian Istituto Nazionale di Fisica Nucleare (INFN); Monbusho, JSPS, and Toray Science Foundation of Japan; the Dutch Stichting voor Fundamenteel Onderzoek der Materie (FOM); the UK Particle Physics and Astronomy Research Council; and the US Department of Energy and National Science Foundation.
Funders:
Funding AgencyGrant Number
Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
European CommunityUNSPECIFIED
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF)UNSPECIFIED
Deutscher Akademischer Austauschdienst (DAAD)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
MonbushoUNSPECIFIED
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
Toray Science Foundation of JapanUNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20170508-140707047
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170508-140707047
Official Citation:The HERMES Collaboration & Airapetian et al., A. Eur. Phys. J. C (2001) 21: 599. doi:10.1007/s100520100765
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77264
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 May 2017 22:03
Last Modified:03 Oct 2019 17:55

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