$\bar d - \bar u$ asymmetry and semi-inclusive production of pions in DIS

Details $\bar d - \bar u$ asymmetry and semi-inclusive production of pions in DIS $\bar d - \bar u$ asymmetry and semi-inclusive production of pions in DIS

2000-09-27

arxiv.org/abs/hep-ph/0009318v1

Phys.Rev. D63 (2001) 114005

Physics

High Energy Physics

High Energy Physics - Phenomenology

47 pages, LaTeX with 19 eps figures

Scientific paper

10.1103/PhysRevD.63.114005

We investigate unambiguities in the extraction of the $\bar d - \bar u$ asymmetry from semi-inclusive production of pions in DIS. The role of several effects beyond the quark-parton model (QPM) which lead to $N_p^{\pi^+} \ne N_n^{\pi^+}$ and $N_p^{\pi^-} \ne N_n^{\pi^-}$ and may therefore cloud such an extraction is studied. The results are discussed in the context of the recent HERMES data. We find that the interaction of the resolved photon with the nucleon significantly modifies the observed $\bar d - \bar u$ asymmetry. The exclusive elastic production of $\rho$ mesons plays a similar role for the large-$z$ data sample. Our estimate shows a rather small effect of the spectator mechanism. Nuclear effects in the deuteron also look potentially important but are difficult to estimate quantitatively. Throughout the paper we make in addition several general remarks concerning semi-inclusive and exclusive production of mesons.

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