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jc09
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So mesons consist of two quark. I am wondering why no stable mesons exist?
arivero said:Note that if the pion had the same mass that the muon, it should be stable at first order, even if the electron is massive. So mass and baryon number is not all the history, spin has a role too.
Parlyne said:I don't see how you conclude this. The [itex]\pi \rightarrow e\nu[/itex] channel may be suppressed by the necessary electron mass insertion; but, it is non-zero at tree level, independent of the relationship between the pion and muon masses.
arivero said:(Actually, when m_pi=m_mu, and keeping m_e at the current value, I am not sure what is greater, if the tree level into electron or the loop corrections into muon...
Vanadium 50 said:Tree into electron. There is zero phase space for muonic decays in your example.
Vanadium 50 said:Tree into electron. There is zero phase space for muonic decays in your example.
Mesons are subatomic particles that are composed of a quark and an antiquark. They are highly unstable and have a very short lifetime, which is why they are not considered stable particles.
Mesons are unstable due to their composition of a quark and an antiquark, which have opposite charges. This causes a constant interaction between the two particles, leading to their decay within a very short time.
No, mesons cannot become stable. The laws of physics dictate that the decay of mesons is inevitable due to the fundamental forces at play within the particles.
Some mesons, known as isospin singlet mesons, are more stable than others. This is because they have a different composition, with a neutral quark and an antiquark with equal positive and negative charges.
Mesons have been extensively studied and observed in particle accelerators and other experiments. These studies have shown that mesons consistently decay within a very short time, providing evidence for their instability.