介子列表

介子是由一个夸克和一个反夸克组成的不稳定亚原子粒子,為强子的一种。强子的另一个成员是重子,由三个夸克组成的亚原子粒子。介子和重子的主要区别在于介子具有整数自旋(因此是玻色子),而重子是费米子(半整数自旋)。因为介子是玻色子,泡利不相容原理不适用于它们。因此,它们可以在短距离内充当作用力的中介粒子,从而在核相互作用等过程中发挥作用。
由于介子是由夸克组成的,它们既参与弱相互作用,也参与强相互作用。带净电荷的介子也参与了电磁相互作用。它们根据夸克含量、总角动量、宇称和各种其他性质(如C-宇称和G-宇称)进行分类。虽然没有介子是稳定的,但质量较低的介子比质量最大的介子更稳定,在粒子加速器或宇宙射线实验中更容易观察和研究。它们通常比重子质量小,这意味着它们在实验中更容易产生,并且比重子更快地表现出更高的能量现象。例如,1974年在J/ψ介子中发现魅夸克[1][2] ,1977年在ϒ介子中发现底夸克[3]。
每个介子都有一个对应的反粒子(反介子),夸克被相应的反夸克取代,反之亦然。例如,一个正介子(π+)是由一个上夸克和一个反下夸克组成的;它对应的反粒子,负介子(π-)由一个反上夸克和一个下夸克组成。一些实验显示了四夸克介子的证据,由两个夸克和两个反夸克组成的奇异介子,但粒子物理学整体上认为它们的存在是可能的[4]。
介子列表
下面列出了所有已知和预测的赝标介子和矢量介子的详细信息。
本列表並未列出反介子。然而,它們只是將所有夸克換成對應的反夸克,並將Q、B、S、C、B′等數值變號。名称旁边有†的粒子已由标准模型预测,但尚未观察到。红色的数值并没有通过实验确定,而是通过夸克模型预测出来的,并且与测量结果一致。
在本列表中的符號有:I(同位旋)、J(總角動量量子數)、P(宇稱,表示座標系鏡像變換時特徵值的奇偶性)、C(C-宇稱)、G(G-宇稱)、u(上夸克)、d(下夸克)、s(奇夸克)、c(粲夸克)、b(底夸克)、Q(電荷)、B(重子数)、 S(奇异数)、C(粲数)、B′(底數)以及多種次原子粒子。
赝标介子
JP = 0-介子
[a] Template:Note 由于非零夸克质量而产生的补偿不精确。
[b] Template:Note 此處根據粒子數據組(PDG)所給出的共振寬度(Γ)值,使用生命期τ = Template:Sfrac 轉換求得。
[c] Template:Note 强本征态,没有确定的寿命。
[d] Template:Note 所给出的Template:Subatomic particle与Template:Subatomic particle的质量与Template:Subatomic particle相同,但已知Template:Subatomic particle与Template:Subatomic particle存在大约为Template:Val的质量差。[14]
[e] Template:NoteWeak eigenstate. Makeup is missing small CP–violating term (see notes on neutral kaons below).
矢量介子
JP = 1-介子
[f] Template:Note 此處根據粒子數據組(PDG)所給出的共振寬度(Γ)值,使用生命期τ = Template:Sfrac 轉換求得。
[g] Template:Note 精确值取决于所用的方法,详见给定参考。
介子共振粒子
因为这个表最初是从公布的结果中推导出来的,其中许多结果是初步的,所以下表中多达64个介子可能不存在,或者质量或量子数错误。
參見
參考文獻
引用
来源
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外部链接
- Particle Data Group – The Review of Particle Physics (2008)Template:Wayback
- Mesons made thinkableTemplate:Wayback, an interactive visualisation allowing physical properties to be compared
- ↑ J.J. Aubert et al. (1974)
- ↑ J.E. Augustin et al. (1974)
- ↑ S.W. Herb et al. (1977)
- ↑ C. Amsler et al. (2008): Charmonium States Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ 14.0 14.1 K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ 22.0 22.1 K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle(782) Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Particle listings – J/Ψ Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle(1S) Template:Wayback
- ↑ 27.0 27.1 K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle(892) Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle(2010) Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle(2007) Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ 31.0 31.1 K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Template:Wayback Template:Wayback Template:Wayback Template:Wayback Particle listings – Template:Subatomic particle Template:Wayback
- ↑ K.A. Olive et al. (2014): Meson Summary Table Template:Wayback