论文标题
$ e^+e^ - \toπ^+π^ - $过程横截面与SND检测器的VEPP-2000撞机$ 0.525 <\ sqrt {s} <0.883 $ GEV
Measurement of the $e^+e^- \toπ^+π^- $ process cross section with the SND detector at the VEPP-2000 collider in the energy region $0.525<\sqrt{s}<0.883$ GeV
论文作者
论文摘要
该过程的横截面$ e^+e^ - \toπ^+π^ - $已在VEPP-2000 $ E^+E^+E^+E^ - $ 525 <\ sqrt [] {s} {s} <883 $ mev的球形中性检测器（SND）实验中测量。该测量基于数据的数据，其集成光度约为4.6 pb $^{ - 1} $。横截面确定的系统不确定性为$ \ sqrt {s}> 0.600 $ gev时为0.8％。 $ρ$ MESON参数的获得为$m_ρ= 775.3 \ pm 0.5 \ pm 0.6 $ meV，$γ_ρ= 145.6 \ pm 0.6 \ pm 0.6 \ pm 0.8 $ mev，$ b_ {ρ\ to e^+ e^ - } 0.04）\ times 10^{ - 5} $，以及$ e^+ e^ - \toΩ\toπ^+π^ - $过程的$ e^+ e^ - \ to t ty $ g $ -parity的参数，为$ b_ {ω\ to e^+ e^+ e^ - } \ e^ - } \ times b_ { 0.02）\ times 10^{ - 6} $和$ ϕ_ {ρΩ} = 110.7 \ pm 1.5 \ pm1.0 $ gegrees。
The cross section of the process $e^+ e^-\toπ^+π^-$ has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 $e^+e^-$ collider VEPP-2000 in the energy region $525 <\sqrt[]{s} <883$ MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb$^{-1}$. The systematic uncertainty of the cross section determination is 0.8 % at $\sqrt{s}>0.600$ GeV. The $ρ$ meson parameters are obtained as $m_ρ= 775.3\pm 0.5\pm 0.6$ MeV, $Γ_ρ= 145.6\pm 0.6\pm 0.8$ MeV, $B_{ρ\to e^+ e^-}\times B_{ρ\toπ^+π^-} = (4.89\pm 0.02\pm 0.04)\times 10^{-5}$, and the parameters of the $e^+ e^-\toω\toπ^+π^-$ process, suppressed by $G$-parity, as $B_{ω\to e^+ e^-}\times B_{ω\toπ^+π^-}= (1.32\pm 0.06\pm 0.02)\times 10^{-6} $ and $ϕ_{ρω} = 110.7\pm 1.5\pm1.0$ degrees.
