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Introduction to Elementary Particle Physics, Second Edition by Alessandro Bettini

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8 The neutral mesons’ oscillations and 𝘊𝘗 violation

In this chapter we shall discuss two important aspects, different but correlated, of the weak interactions: the 𝘊𝘗-violation phenomena and the oscillations between members of flavoured, electrically neutral meson–antimeson pairs, the K0s, the B0s, the Bs0s and the D0s. In each case, the states of definite flavour differ from those of definite mass and lifetime.

We begin with an elementary discussion of the neutral K system that will elucidate which are the states of definite strangeness, those of definite 𝘊𝘗 and those with definite mass and lifetime. We shall describe the oscillation between the former ...

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