Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation

The BELLE collaboration, Владимир Михайлович Аульченко

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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 π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η 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 H1¥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1¥. 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.

Original languageEnglish
Article number092008
Number of pages26
JournalPhysical Review D
Volume100
Issue number9
DOIs
Publication statusPublished - 27 Nov 2019

Keywords

  • SINGLE-SPIN ASYMMETRY
  • POLARIZED ANTIPROTONS
  • 2-HADRON PRODUCTION
  • FRAGMENTATION
  • DENSITIES
  • QUARKS

Fingerprint Dive into the research topics of 'Azimuthal asymmetries of back-to-back π±- (π0, η, π±) pairs in e+e- annihilation'. Together they form a unique fingerprint.

Cite this