Sivers Effect in Dihadron Electroproduction

TL;DR

This paper investigates the Sivers effect in dihadron electroproduction within polarized SIDIS, providing new theoretical expressions, numerical predictions, and experimental implications for understanding spin-momentum correlations.

Contribution

It introduces a novel approach to measure the Sivers effect using dihadron production and offers a leading order parton model expression for the cross section.

Findings

Numerical predictions for single spin asymmetries in COMPASS kinematics.

A new theoretical expression for dihadron SIDIS cross section.

Modified Monte Carlo generator including Sivers effect.

Abstract

The Sivers effect in polarized SIDIS can be measured in two hadron production as sine modulations involving the azimuthal angles $\varphi_T$ and $\varphi_R$ of both the total and the relative transverse momenta of the hadron pair, complementary to the conventional single hadron studies. In this talk we briefly present the results obtained in our recent work [1] and [2]. We also present the leading order parton model expression for the two hadron SIDIS cross section for different choices of the relative transverse momentum that dismiss the seeming contradiction of our results with previous work. Finally, we show the numerical predictions for the corresponding single spin asymmetries in the kinematics of COMPASS experiment obtained using the modified version of the $\tt{LEPTO}$ Monte Carlo event generator that includes the Sivers effect.