Azimuthal asymmetries of back-to-back pi ± - (pi0, n, pi±) pairs in e + e - annihilation

Hairong, Li and Anselm G, Vossen and Giri, Anjan Kumar (2019) Azimuthal asymmetries of back-to-back pi ± - (pi0, n, pi±) pairs in e + e - annihilation. Physical Review D, 100 (9). ISSN 2470-0010

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Abstract

This work reports the first observation of azimuthal asymmetries around the thrust axis in eþe- annihilation of pairs of back-to-back charged pions in one hemisphere, and p0 and ? mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The p0 and ? asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H?1 and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the ? final states will provide additional information on the flavor structure of H?1. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb-1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

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