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Contributions from higher twist effects to the quark fragmentation functions in neutrino data

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
100
Issue
2
Identifiers
DOI: 10.1016/0370-2693(81)90771-1
Disciplines
  • Physics

Abstract

Abstract Quark fragmentation functions are studied with ≈3500 charged current events induced in the bubble chamber Gargamelle by neutrinos of the SPS wide band beam, with 〈 E ν 〉 ≈ 25 GeV. The Q 2 and W 2 regions covered by this experiment are Q 2 ≈ 0–40 GeV 2 and W 2 ≈ 1–100 GeV 2, the mean values being 〈 Q 2〉 = 6.5 GeV 2, 〈 W 2〉 = 22GeV 2. A correlation between the variables z = E π E H and y = E H E v is found in the data in the region Q 2 = 1–10 GeV 2, which can be explained in terms of higher twist effects. These effects reproduce the Q 2 evolution of the non-singlet moments of the fragmentation function without any need for logarithmic terms.

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