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Dihadron helicity correlation in photon-nucleus collisions

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arxiv 2404.19202 v3 pith:YDOB5HSJ submitted 2024-04-30 hep-ph hep-exnucl-ex

classification hep-phhep-exnucl-ex
keywords helicitycollisionscorrelationback-to-backdihadronexperimentfragmentationfuture
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The helicity correlation of two back-to-back hadrons is a powerful tool that makes it possible to probe the longitudinal spin transfer, $G_{1L}$, in unpolarized hadronic collisions. In this work, we investigate the helicity correlation of back-to-back dihadrons produced in photon-nucleus collisions with both space-like and quasireal photons and explore its potential in understanding the flavor dependence of spin-dependent fragmentation functions. We present helicity amplitudes of partonic scatterings with both virtual and real photons and make numerical predictions for the dihadron helicity correlations at the future Electron Ion Collider experiment and the current RHIC/LHC ultra-peripheral collision experiment. Future experimental measurements can also illuminate the fragmentation function of circularly polarized gluons.

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  1. Helicity correlation of neighboring dihadron

    hep-ph 2024-11 conditional novelty 5.0 of 10

    The helicity correlation of two neighboring hadrons is driven by QCD evolution from the longitudinal spin-transfer function, offering a new unpolarized-collision observable for spin physics.

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