Study of the process $e^+e^-\to 3(\pi^+\pi^-)$ in the c.m.energy range 1.5--2.0 gev with the cmd-3 detector

TL;DR

This paper reports the measurement of the cross section for the process e+e- to six pions in the 1.5 to 2.0 GeV energy range, revealing a sharp drop near the proton-antiproton threshold and providing initial insights into six-pion production dynamics.

Contribution

First measurement of the e+e- to 6-pion cross section in the 1.5-2.0 GeV range with detailed analysis of the dynamics involved.

Findings

Observed a sharp drop in cross section near p p̄ threshold

Provided the first study of six-pion production dynamics

Measured cross section using 22 pb$^{-1}$ of data

Abstract

The cross section of the process $e^+e^- \to 3(\pi^+\pi^-)$ has been measured using 22 pb$^{-1}$ of integrated luminosity collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider in the c.m. energy range 1.5 -- 2.0 GeV. The measured cross section exhibits a sharp drop near the $p\bar p$ threshold. A first study of dynamics of six-pion production has been performed.