The four kaons are: K− , negatively charged (containing a strange quark and an up antiquark) has mass 493.677 ± 0.013 MeV and mean lifetime (1.2380 ± 0.0020) × 10−8 s. K+ (antiparticle of above) positively charged (containing an up quark and a strange antiquark) must (by CPT invariance) have mass and lifetime equal to that of K− .

Kaons are mesons formed by a strange (or anti-strange) quark and an up or down quark. They have strangeness of ± 1. Both charged kaons (K +, K -) and neutral kaons (K 0, 0) exist. These neutral kaons are distinguished by their strangeness: S (K 0)=1, S (0)=-1. The neutral kaons offer a very interesting subject for studying.

2024年11月6日 · Learn all about strange quarks for your A Level Physics exam. This revision note includes information about the production of strange particles and strangeness.

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There are four types of kaons, but two of them are relatively easy to understand. There is the K + and the K 0. The + and 0 above the letter K refer to whether the charge is positive, or 0 (neutral). The K + is made of one up quark, and one strange antiquark.

Quark mixing - Cabibbo Quark content of kaon is us (K+) and ds (K0) Main decays are K+→μ+ν μ, K+→π0e+ν e, K0→ππ Weak interaction has to allow transition s→u There are good reasons why W (weak interaction) couples only to left-handed doublets How …

The most accessible of these is the reaction, Bd0 → Ψ KS0, where the symbol Ψ denotes the bound state of a charmed quark and a charmed antiquark. The signal being looked for is the difference between the decay to this state, as a function of time, of Bd0 and its antiparticle .

2023年5月11日 · In terms of charge, a neutral kaon could consist of a down and anti-strange quark, or an anti-down and a strange quark. However, which of these is considered to be the particle, and which the antiparticle?

We investigate the valence u and s¯ quark distribution functions of the K+ meson, vK (u) (x,Q2) and vK (s¯) (x,Q2), in the framework of the chiral constituent quark model.