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arXiv 0803.1074hep-ph
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标量介子与核子的极化率

Scalar mesons and polarizability of the nucleon

Martin Schumacher

摘要:

结果表明,标量介子$σ$、$f_0(980)$和$a_0(980)$作为$t$通道交换,定量地解决了抗磁性问题,并解释了只考虑π介子云时出现的极化率$α$的大部分缺失.质子$α_p$的极化率证实了$σ$介子的双光子宽度为$Γ_{σγγ}=(2.58\pm 0.26)$ keV。

英文摘要:

It is shown that the scalar mesons $σ$, $f_0(980)$ and $a_0(980)$ as $t$-channel exchanges quantitatively solve the problem of diamagnetism and give an explanation of the large missing part of the electric polarizability $α$ showing up when only the pion cloud is taken into account. The electric polarizability of the proton $α_p$ confirms a two-photon width of the $σ$ meson of $Γ_{σγγ}=(2.58\pm 0.26)$ keV.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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