Sar WorS 2025 - 4th Sardinian Workshop on Spin

Session

Single spin asymmetries

Jun 12, 2025, 9:00 AM

Conveners

Single spin asymmetries

• Mariaelena Boglione (Istituto Nazionale di Fisica Nucleare)

1. NLO corrections and factorization for transverse single-spin asymmetries

Daniel Rein (Universität Tübingen)

6/12/25, 9:00 AM

We present next-to-leading order QCD corrections for the cross sections of
$\ell p^\uparrow\to (h\,\mathrm{or}\,jet)X$ with transversely polarized initial protons.
These cross sections are known to be power-suppressed in QCD
and probe twist-3 parton correlation functions in the proton. Our calculation exhibits the full complexity of a
perturbative QCD analysis beyond leading power,...

12. Quark and gluon Sivers functions in dijets at the EIC

Patricia Andrea Gutierrez Garcia (Universidad Complutense de Madrid)

6/12/25, 9:35 AM

We explore the quark and the gluon Sivers functions in dijet production at the EIC. Our analysis includes a comprehensive investigation of the sin⁡($\phi_S - \phi_r$) modulated cross-sections for both quark and gluon channels. Furthermore, we state the possibility of re-defining the resummation method, altering the treatment of large logarithmic corrections. We also test different models for...

6. The Sivers effect in atomic Compton scattering

Andrea Signori (Istituto Nazionale di Fisica Nucleare)

6/12/25, 10:10 AM

In this talk I present a QED-based analog of the Sivers effect in QCD. In particular, Compton scattering off an ionized Helium-4 target is used as a process to access the Sivers effect for the electron in the atomic target.
To account for the motion of the bound electron in the Helium target, hydrogen-like wave functions in momentum space are employed.
Both the unpolarized TMD distribution...