光生$Δ(2200)7/2^-$的证据和高质量下手征对称性恢复的结果
Evidence for $Δ(2200)7/2^-$ from photoproduction and consequence for chiral-symmetry restoration at high mass
摘要：
我们报告的分波分析的新数据的双极化变量$E$的反应$γp\to π^+ n$和$γp\to π^0 p$和进一步的数据发表较早。Bonn-Gatchina（BnGa）形式主义的分析揭示了一个鲜为人知的重子共振，一星$Δ(2200)7/2^-$的证据。这是具有自旋宇称$J^P=7/2^-$的最低质量$Δ^*$共振。它的质量显著高于其宇称伙伴$Δ(1950)7/2^+$的质量，其是具有自旋宇称$J^P=7/2^+$的最低质量$Δ^*$共振。有人认为手征对称性可能在强子激发的高质量区域恢复，并且这两个共振应该是质量简并的。我们的发现与这一预测相矛盾。
英文摘要：
We report a partial-wave analysis of new data on the double-polarization variable $E$ for the reactions $γp\to π^+ n$ and $γp\to π^0 p$ and of further data published earlier. The analysis within the Bonn-Gatchina (BnGa) formalism reveals evidence for a poorly known baryon resonance, the one-star $Δ(2200)7/2^-$. This is the lowest-mass $Δ^*$ resonance with spin-parity $J^P=7/2^-$. Its mass is significantly higher than the mass of its parity partner $Δ(1950)7/2^+$ which is the lowest-mass $Δ^*$ resonance with spin-parity $J^P=7/2^+$. It has been suggested that chiral symmetry might be restored in the high-mass region of hadron excitations, and that these two resonances should be degenerate in mass. Our findings are in conflict with this prediction.
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