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論文

Azimuthal asymmetries of back-to-back $$pi^pm-(pi^0,eta,pi^pm)$$ pairs in $$e^+e^-$$ annihilation

Li, H.*; 谷田 聖; Belle Collaboration*; 他131名*

Physical Review D, 100(9), p.092008_1 - 092008_26, 2019/11

 被引用回数:8 パーセンタイル:50.04(Astronomy & Astrophysics)

This work reports the first observation of azimuthal asymmetries around the thrust axis in $$e^+e^-$$ annihilation of pairs of back-to-back charged pions in one hemisphere, and $$pi^0$$ and $$eta$$ mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The $$pi^0$$ and $$eta$$ 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 $$H_1^{perp}$$ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the $$eta$$ final states will provide additional information on the flavor structure of $$H_1^{perp}$$. 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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