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arXiv · 1202.0323

First extraction of Interference Fragmentation Functions from e+e- data

A. Courtoy·A. Bacchetta·M. Radici·A. Bianconi
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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 π+π- 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 π+π- 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.

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A. Courtoy, A. Bacchetta, M. Radici, A. Bianconi. 2012-05-11. First extraction of Interference Fragmentation Functions from e+e- data. https://doi.org/10.1103/physrevd.85.114023

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