Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC
Carlo Flore Marco Zaccheddu Umberto D'Alesio
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Abstract
We study Collins azimuthal asymmetries in pion-in-jet production in polarized lepton-proton collisions, extending previous analyses of polarized $pp$ scattering to a complementary and theoretically simpler process. We keep adopting a simplified transverse momentum dependent (TMD) approach, with a collinear configuration for the initial state, and employ the transversity and Collins fragmentation functions as extracted from semi-inclusive deep inelastic scattering and $e^+ e^-$ annihilation processes. We then compute azimuthal asymmetries for the Electron-Ion Collider (EIC) kinematics, both within a leading order (LO) approach and by including quasireal photon exchange in the Weizsäcker-Williams approximation. Although this contribution is relevant in the whole kinematical range explored, it does not spoil the dominance of quark-initiated channels, leaving only a marginal role to their gluon counterparts. In this respect, Collins asymmetries in lepton-proton processes allow for a much clearer access to the transversity distribution, including its sea-quark component. As we will argue, a comparison with future EIC data could represent a further step in testing the hypothesis of the universality of the Collins function as well as of the TMD factorization for this class of processes.引用本文复制引用
Carlo Flore,Marco Zaccheddu,Umberto D'Alesio.Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC[EB/OL].(2026-05-04)[2026-05-06].https://arxiv.org/abs/2605.02890.学科分类
物理学
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