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Measurement of azimuthal asymmetries in inclusive charged dipion production in e^+e^- annihilations at sqrt{s} = 3.65 GeV
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arxiv 1507.06824 v2 pith:IN2OCSGY submitted 2015-07-24 hep-ex
Measurement of azimuthal asymmetries in inclusive charged dipion production in e^+e^- annihilations at sqrt{s} = 3.65 GeV
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We present a measurement of the azimuthal asymmetries of two charged pions in the inclusive process $e^+e^-\rightarrow \pi\pi X$ based on a data set of 62 $\rm{pb}^{-1}$ at the center-of-mass energy $\sqrt{s}=3.65$ GeV collected with the BESIII detector. These asymmetries can be attributed to the Collins fragmentation function. We observe a nonzero asymmetry, which increases with increasing pion momentum. As our energy scale is close to that of the existing semi-inclusive deep inelastic scattering experimental data, the measured asymmetries are important inputs for the global analysis of extracting the quark transversity distribution inside the nucleon and are valuable to explore the energy evolution of the spin-dependent fragmentation function.
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Cited by 3 Pith papers
Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.
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StringSpinner 2.0: Enabling quark spin effects in PYTHIA for $e^+e^-$ annihilation
hep-ph 2026-06 unverdicted novelty 5.0
StringSpinner 2.0 implements propagation of spin correlations from a user-defined joint q qbar density matrix in PYTHIA for e+e- to hadrons, demonstrated via Collins asymmetry calculations for back-to-back pions.
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Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC
hep-ph 2026-05 unverdicted novelty 4.0
Collins asymmetries for pion-in-jet production in polarized lepton-proton collisions provide clearer access to transversity distributions at the EIC and test the universality of the Collins function.
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Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC
hep-ph 2026-05 unverdicted novelty 4.0
Collins asymmetries for pion-in-jet production at the EIC are calculated in LO and Weizsacker-Williams approximations, showing quark-channel dominance and clearer access to sea-quark transversity.
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