Precise determination of the eta_c mass and width in the radiative J/Psi -> eta_c gamma decay

TL;DR

This paper uses effective field theory to accurately determine the eta_c meson's mass and width from photon line shape data in J/Psi decays, providing precise measurements.

Contribution

It introduces an effective field theory approach to extract eta_c properties from experimental photon line shape data.

Findings

Precise eta_c mass measurement

Accurate eta_c width determination

Effective field theory effectively models the decay process

Abstract

We present an effective field theory based extraction of the eta_c mass and width from a recent measurement by CLEO of the photon line shape in J/Psi -> eta_c gamma decay.