New experimental data for the decays $\phi\to\mu^+\mu^-$ and $\phi\to\pi^+\pi^-$ from SND detector

TL;DR

This paper presents new experimental measurements of the decay processes of the phi meson into muon and pion pairs using the SND detector at VEPP-2M, providing updated branching ratios near the phi resonance.

Contribution

It reports new experimental data on phi meson decays into muon and pion pairs, with precise branching ratio measurements, enhancing understanding of these decay channels.

Findings

Measured B(phi→μ+μ−) = (3.30 ± 0.45 ± 0.32)×10⁻⁴

Measured B(phi→π+π−) = (0.71 ± 0.11 ± 0.09)×10⁻⁴

Provided experimental data near the phi(1020) resonance.

Abstract

The processes $e^+e^-\to\mu^+\mu^-$ and $e^+e^-\to\pi^+\pi^-$ have been studied with SND detector at VEPP-2M $e^+e^-$ collider in the vicinity of $\phi(1020)$ resonance. The branching ratios $B(\phi\to\mu^+\mu^-)=(3.30\pm 0.45\pm 0.32)\times 10^{-4}$ and $B(\phi\to\pi^+\pi^-)=(0.71\pm 0.11\pm 0.09)\times 10^{-4}$ were obtained.