APCTP Focus Program in Nuclear Physics 2022: Hadron Physics Opportunities with JLab Energy and Luminosity Upgrade

JLab Upgrade Opportunities for SIDIS Dihadrons at CLAS *

Jul 19, 2022, 2:00 PM

30m

Classroom 512 (APCTP)

Session

Speaker

Christopher Dilks (Duke University)

Description

Measurements in SIDIS provide a wide range of insights into nucleon structure and hadronization. Recent measurements of beam spin asymmetries of ${\pi }^{+}{\pi }^{-}$ dihadron production at CLAS provide the first opportunity to extract $e(x)$, a collinear twist-3 distribution function. Ongoing and future experiments at 12 GeV will grant access to other collinear twist-3 distributions, such as $h_L(x)$. Moments of these twist-3 distributions correlate quark spin and color Lorentz forces. On the fragmentation side, the Dihadron Fragmentation Functions (DiFFs) are accessible, and their partial waves relate the fragmenting quark spin to the relative dihadron angular momentum. In particular, recent CLAS measurements indicate the helicity-dependent DiFF $G_1^{\perp }$ is significant, with a sign change around the $\rho$-meson mass. A summary of recent measurements and opportunities from SIDIS dihadrons will be presented, along with prospects for measurements with an upgraded energy and luminosity at CLAS.

Presentation materials

dilks-dihadrons.pdf