The processes +e-→ηπ+π-→γγπ+π-,e+e-→ηπ+π-→π0π+π-π+π- and e+e-→ωπ+π-→π0π+π-π+π- have been studied with the CMD-3 detector at the VEPP2000 collider. For analysis data collected in the center-of-mass energy range from 1.2 to 2.0 GeV is used. Studied data corresponding to an integrated luminosity of 3×104 nb-1 were recorded in 2011 and 2012. The Born cross section of e+e-→ηπ+π- has been measured in the η→γγ channel and is in good agreement with results obtained in other experiments. There are also preliminary results for the e+e--→ηπ+π- and e+e-→ωπ+π- Born cross sections in the η→π+π-π0 and ω→π+π-π0 final states, respectively. The e+e-→ηπ+π- Born cross section data have been used to determine the τ-→ηπ-π0ντ decay branching fraction.
Abstract
The processes +e-→ηπ+π-→γγπ+π-,e+e-→ηπ+π-→π0π+π-π+π- and e+e-→ωπ+π-→π0π+π-π+π- have been studied with the CMD-3 detector at the VEPP2000 collider. For analysis data collected in the center-of-mass energy range from 1.2 to 2.0 GeV is used. Studied data corresponding to an integrated luminosity of 3×104 nb-1 were recorded in 2011 and 2012. The Born cross section of e+e-→ηπ+π- has been measured in the η→γγ channel and is in good agreement with results obtained in other experiments. There are also preliminary results for the e+e--→ηπ+π- and e+e-→ωπ+π- Born cross sections in the η→π+π-π0 and ω→π+π-π0 final states, respectively. The e+e-→ηπ+π- Born cross section data have been used to determine the τ-→ηπ-π0ντ decay branching fraction.
Open Access
DownLoad: