论文标题
$λ（1405）$ $ D（k^ - ，n）πς$ reactions的极点位置
Pole position of $Λ(1405)$ measured in $d(K^-,n)πΣ$ reactions
论文作者
论文摘要
我们测量了一组$π^\pmς^\ mp $，$π^0σ^0 $，以及$ \ bar {k} n $质量阈值$ k^ - $ - $ k^ - $ - 诱使对Deuteron的反应。我们推导了$ s $ -Wave $ \ bar {k} n \rightarrowπς$和$ \ bar {k} n \ rightArrow \ bar {k} n $散射在iSospin 0通道中的散射幅度在$ \ bar {k} n $ and $ funder的框架中。我们发现，与$λ（1405）$相对应的共振极点位于1417.7 $^{+6.0} _ { - 7.4} $（拟合错误）$^{+1.1} _ { - 1.0}错误）$^{+1.7} _ { - 2.0} $（系统错误）] $ i $ mev/$ c^2 $，比粒子数据组确定的值更接近$ \ bar {k} n $质量阈值。
We measured a set of $π^\pmΣ^\mp$, $π^0Σ^0$, and $π^-Σ^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrowπΣ$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $πΣ$ coupled channel. We find that a resonance pole corresponding to $Λ(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group.
