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The onset of color transparency in holographic light-front QCD

Jun 7, 2021, 11:20 AM
30m
Online

Online

Zoom meeting ID: 982 7429 3376 (Please register for the password)
Slides Session 2

Speaker

Stanley Brodsky (SLAC)

Description

The color transparency of a hadron, propagating without absorption in a nucleus, is a fundamental property of QCD, reflecting the hadron's internal structure and the effective size of its color distribution when it is produced at high transverse momentum $Q$. By using the framework of holographic light-front QCD, one can predict the $Q^2$ behavior of the effective transverse size of the hadronic cross section, its dependence on the hadron's twist $\tau$-- the number of constituent quarks of its valence state -- and the quark current which triggers the initial formation of a small color-singlet configuration which can propagate without interaction in a nucleus. One finds a significant delay in $Q^2$ for the onset of color transparency for hadrons with twist $\tau \ge 3$; this can explain the absence of color transparency for the electroproduction of a proton in the kinematic range of existing experimental tests. Remarkably, the onset in $Q^2$ of color transparency for baryons is predicted to strongly differ for electroproduction events corresponding to the spin-conserving (twist-3) Dirac form factor vs. the spin-flip (twist-4) Pauli form factor.

Presentation materials