Confirmation of a0(1450) and π1(1600) in p̄p→ωπ+π−π0 at rest
Confirmation of a0(1450) and π1(1600) in p̄p→ωπ+π−π0 at rest
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DOI：
10.1016/s0370-2693(03)00643-9
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发表时间：
2003-06
影响因子：
4.4
通讯作者：
C. A. Baker;C. Batty;K. Braune;D. Bugg;N. Djaoshvili;W. Dünnweber;M. Faessler;F. Meyer‐Wildhagen;L. Montanet;I. Uman;S. Wallis-Plachner;B. Zou
中科院分区：
文献类型：
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作者：
C. A. Baker;C. Batty;K. Braune;D. Bugg;N. Djaoshvili;W. Dünnweber;M. Faessler;F. Meyer‐Wildhagen;L. Montanet;I. Uman;S. Wallis-Plachner;B. Zou
晶体桶数据给出了p p→ωπ+π−π 0在静止时，ω→π+π−π0。一个小但明确的信号证实了α 0（1450）衰减到ω p。它对ωρ的分支比是对ηπ的分支比的10.7±2.3倍，在η π中它首次被发现。当用包含ωρ通道的s依赖性的Breit-Wigner振幅拟合时，极点位置为M=1440+40−15−i（55±7）MeV。观测到奇异的π1（1600）衰变为b1π，轨道角动量L=0和2。还存在与α 1（1640）衰减到ωρ一致的强JPC=1++信号和衰减到[b1（1235）π]L=1的弱得多的信号。对数据贡献最大的是在ωρ中的JPC=0−+信号，表明在M=1470±15−i（57±7）MeV处有一个极点。
Crystal Barrel data are presented for p ̄ p→ωπ+π−π0at rest, with ω→π+π−π0. A small but definite signal confirms a0(1450) decaying to ωρ. Its branching ratio to ωρ is a factor 10.7±2.3 larger than to ηπ, where it was first identified. When fitted with a Breit–Wigner amplitude which includes the s-dependence of the ωρ channel, the pole position is M=1440+40−15−i(55±7) MeV. The exotic π1(1600) is observed decaying to b1π with orbital angular momenta L=0 and 2. There is also a strong JPC=1++signal consistent with a1(1640) decaying to ωρ and a much weaker signal for decays to [b1(1235)π]L=1. The strongest contribution to the data is a JPC=0−+signal in ωρ suggesting a pole at M=1470±15−i(57±7) MeV.