接近阈值的$pp\to K^+Σ^+n$反应横截面
Cross section of the $pp\to K^+Σ^+n$ reaction close to threshold
摘要:
我们测量了COSY Jülich上接近超子产生阈值的$pp$碰撞中$K^+$ -介子产生的包容性数据,并确定了超子-核子不变质谱.将光谱分解为三部分:$Λp$、$Σ^0p$和$Σ^+n$。发现$Σ^+n$沟道的截面远小于先前在该过剩能量区域中的测量。数据与以前的结果在较高的能量是兼容的相空间依赖。
英文摘要:
We have measured inclusive data on $K^+$-meson production in $pp$ collisions at COSY Jülich close to the hyperon production threshold and determined the hyperon-nucleon invariant mass spectra. The spectra were decomposed into three parts: $Λp$, $Σ^0p$ and $Σ^+n$. The cross section for the $Σ^+n$ channel was found to be much smaller than a previous measurement in that excess energy region. The data together with previous results at higher energies are compatible with a phase space dependence.
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