Measurement of the $\phi$ meson parameters with CMD-2 detector at VEPP-2M Collider

TL;DR

This paper reports precise measurements of the $$ meson parameters using a large dataset collected with the CMD-2 detector at the VEPP-2M collider, refining previous values and reducing uncertainties.

Contribution

The study provides new, more accurate measurements of the $$ meson mass, width, and cross-section parameters based on extensive data analysis.

Findings

Measured $$ meson mass as 1019.504 MeV/c^2

Determined $$ meson width as 4.477 MeV

Obtained cross-section $\sigma_0$ as 1367 nb

Abstract

About 300 000 $e^+e^-\to \phi\to K^0_L K^0_S$ events in the center of mass energy range from 984 to 1040 MeV were used for the measurement of the $\phi$ meson parameters. The following results have been obtained: $\sigma_0 = (1367 \pm 15 \pm 21) nb, m_{\phi}=(1019.504 \pm 0.011 \pm 0.033) MeV/c^2, \Gamma_\phi=(4.477 \pm 0.036 \pm 0.022) MeV, \Gamma_{e^+e^-}\cdot B(\phi\to K^0_L K^0_S) = (4.364 \pm 0.048 \pm 0.065)\cdot 10^{-4}$ MeV.