论文标题
部分可观测时空混沌系统的无模型预测
Measurement of differential cross sections for $Σ^+p$ elastic scattering in the momentum range 0.44-0.80 GeV/c
论文作者
论文摘要
我们在J-PARC强调实验设施上进行了新的$σ^+ P $散射实验。大约2400 $σ^+p $弹性散射事件是从$ 4.9 \ times 10^7 $标记的$σ^+$粒子标记的$σ^+$动量范围0.44-0.44-0.80 gev/$ c $。 $σ^+ p $弹性散射的差分截面的精度比以前的实验更好得多。获得的差分横截面约为2 Mb/sr，不如基于短距离区域中Quark群集模型的FSS2和FSS模型所预测的差异。通过对获得的差分截面进行相移分析，我们首次通过实验得出了$^3 S_1 $和$^1 P_1 $通道的相移。 $^3 s_1 $通道的相移，其中预测了由于夸克之间的Pauli效应，该通道被评估为$ 20^\ Circ <|δ_ {^3S_1} | <35^\ Circ $。如果假定$δ_ {^3s_1} $的符号为负，则正如Nijmegen扩展核心模型所预测的那样，此通道中的相互作用是中等排斥的。
We performed a novel $Σ^+ p$ scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 $Σ^+ p$ elastic scattering events were identified from $4.9 \times 10^7$ tagged $Σ^+$ particles in the $Σ^+$ momentum range 0.44 -- 0.80 GeV/$c$. The differential cross sections of the $Σ^+ p$ elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the $^3 S_1$ and $^1 P_1$ channels for the first time. The phase shift of the $^3 S_1$ channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as $20^\circ<|δ_{^3S_1}|<35^\circ$. If the sign of $δ_{^3S_1}$ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.
