Dihadron fragmentation functions and their relevance for transverse spin studies

Journal of Physics Conference Series 11/2010; 295(1). DOI: 10.1088/1742-6596/295/1/012053
Source: arXiv


Dihadron fragmentation functions describe the probability that a quark
fragments into two hadrons plus other undetected hadrons. In particular, the
so-called interference fragmentation functions describe the azimuthal asymmetry
of the dihadron distribution when the quark is transversely polarized. They can
be used as tools to probe the quark transversity distribution in the nucleon.
Recent studies on unpolarized and polarized dihadron fragmentation functions
are presented, and we discuss their role in giving insights into transverse
spin distributions.

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Available from: Marco Radici
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    ABSTRACT: Using perturbative quantum chromodynamics, we compute dihadron fragmentation functions for a large invariant mass of the dihadron pair. The main focus is on the interference fragmentation function H(1)(∢), which plays an important role in spin physics of the nucleon. Our calculation also reveals that H(1)(∢) and the Collins fragmentation function have closely related underlying dynamics. By considering semi-inclusive deep-inelastic scattering, we further show that collinear factorization in terms of dihadron fragmentation functions and collinear factorization in terms of single-hadron fragmentation functions provide the same result in the region of intermediate invariant mass.
    Preview · Article · Apr 2011 · Physical Review Letters
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    ABSTRACT: We report on the first extraction of interference fragmentation functions from the semi-inclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite \pi+\pi- pairs is related to the transverse polarization of fragmenting quarks through a significant polarized dihadron fragmentation function. Extraction of the latter requires the knowledge of its unpolarized counterpart, the probability density for a quark to fragment in a \pi+\pi- pair. Since data for the unpolarized cross section are missing, we extract the unpolarized dihadron fragmentation function from a Monte Carlo simulation of the cross section.
    Full-text · Article · Feb 2012 · Physical review D: Particles and fields