Two-hadron semi-inclusive production including subleading twist

Details Two-hadron semi-inclusive production including subleading twist Two-hadron semi-inclusive production including subleading twist

2003-11-13

arxiv.org/abs/hep-ph/0311173v2

Phys.Rev. D69 (2004) 074026

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, RevTeX4, 5 figures, revised notation of several formulae, added text in Secs. III-V, added references

Scientific paper

10.1103/PhysRevD.69.074026

We extend the analysis of two-hadron fragmentation functions to the subleading twist, discussing also the issue of color gauge invariance. Our results can be used anywhere two unpolarized hadrons are semi-inclusively produced in the same fragmentation region, also at moderate values of the hard scale Q. Here, we consider the example of polarized deep-inelastic production of two hadrons and we give a complete list of cross sections and spin asymmetries up to subleading twist. Among the results, we highlight the possibility of extracting the transversity distribution with longitudinally polarized targets and also the twist-3 distribution e(x), which is related to the pion-nucleon sigma term and to the strangeness content of the nucleon.

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