Interplay among transversity induced asymmetries in hadron leptoproduction

TL;DR

This paper investigates the relationships among various transversity-induced asymmetries in hadron leptoproduction, revealing that they are driven by a common physical process based on analysis of high-statistics COMPASS data.

Contribution

It provides the first quantitative analysis linking single and di-hadron asymmetries, demonstrating their common physical origin in transversity-induced fragmentation mechanisms.

Findings

Identified relationships among three asymmetries based on azimuthal angle differences.

Established that all asymmetries are driven by a shared fragmentation process.

Provided experimental evidence for the interconnectedness of transversity effects.

Abstract

In the fragmentation of a transversely polarized quark several left-right asymmetries are possible for the hadrons in the jet. When only one unpolarized hadron is selected, it exhibits an azimuthal modulation known as Collins effect. When a pair of oppositely charged hadrons is observed, three asymmetries can be considered, a di-hadron asymmetry and two single hadron asymmetries. In lepton deep inelastic scattering on transversely polarized nucleons all these asymmetries are coupled with the transversity distribution. From the high statistics COMPASS data on oppositely charged hadron-pair production we have investigated for the first time the dependence of these three asymmetries on the difference of the azimuthal angles of the two hadrons. The similarity of transversity induced single and di-hadron asymmetries is discussed. A new analysis of the data allows to establish quantitative relationships among them, providing for the first time strong experimental indication that the underlying fragmentation mechanisms are all driven by a common physical process.