2019 journal article

Beam spin asymmetry in the electroproduction of a pseudoscalar meson or a scalar meson off the scalar target

PHYSICAL REVIEW D, 99(11).

By: C. Ji n , H. Choi*, A. Lundeen n & B. Bakker

co-author countries: Korea (Republic of) πŸ‡°πŸ‡· Netherlands πŸ‡³πŸ‡± United States of America πŸ‡ΊπŸ‡Έ
Source: Web Of Science
Added: July 1, 2019

We discuss the electroproduction of a pseudoscalar (${0}^{\ensuremath{-}+}$) meson or a scalar (${0}^{++}$) meson off the scalar target. The most general formulation of the differential cross section for the ${0}^{\ensuremath{-}+}$ or ${0}^{++}$ meson process involves only one or two hadronic form factors, respectively, on a scalar target. The Rosenbluth-type separation of the differential cross section provides the explicit relation between the hadronic form factors and the different parts of the differential cross section in a completely model-independent manner. The absence of the beam spin asymmetry for the pseudoscalar meson production provides a benchmark for the experimental data analysis. The measurement of the beam spin asymmetry for the scalar meson production may also provide a unique opportunity not only to explore the imaginary part of the hadronic amplitude in the general formulation but also to examine the significance of the chiral-odd generalized parton distribution (GPD) contribution in the leading-twist GPD formulation.