paper

Detecting correlated di-hadron pairs: about the extraction of transversity and beyond

arXiv:1308.5928 · doi:10.1142/S2010194514600453

Abstract

We summarize the latest achievements about the extraction of the transversity parton distribution and proton tensor charge based on an analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets. Recently released data for proton and deuteron targets by HERMES and COMPASS allow for a flavor separation of the valence components of transversity. At variance with the Collins effect, this extraction is performed in the framework of collinear factorization and relies on di-hadron fragmentation functions. The latter have been taken from the first recent analysis of the semi-inclusive production of two pion pairs in back-to-back jets in e+e- annihilation. We also comment on the possibility of isolating new azimuthally asymmetric correlations of opposite pion pairs, which could arise when a fragmenting quark crosses parity-odd domains localized in Minkowski space-time and induced by the topologically nontrivial QCD background (the so-called θ vacuum).

10 pages, 2 double figures, style file for "Int. J. Mod. Phys.: Conf. Series" included; adapted from the document to appear in the proceedings of the QCD Evolution Workshop (QCD2013), Thomas Jefferson National Accelerator Facility, Newport News (VA - USA), May 6-10, 2013

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