QCD angular momentum in N→ A transitions

초록

N & RARR; A transitions offer new possibilities for exploring the isovector component of the QCD quark angular momentum (AM) operator causing the Ju-d flavor asymmetry in the nucleon. We extend the concept of QCD AM to transitions between baryon states, using light-front densities of the energy-momentum tensor in transversely localized states. We calculate the N & RARR; A transition AM in the 1/Nc expansion, connect it with the Ju-d flavor asymmetry in the nucleon, and estimate the values using lattice QCD results. In the same setup we connect the transition AM to the transition GPDs sampled in hard exclusive electroproduction processes with N & RARR; A transitions, enabling experimental study of the transition AM.& COPY; 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons .org /licenses /by /4 .0/). Funded by SCOAP3.

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