- #1
unscientific
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Homework Statement
(a)Draw feynman diagrams of upsilon meson. Why is decay to ##q\bar q## states suppressed? Explain why width for 4s is much wider.
(b) How do B mesons decay? Why is no other type of interaction possible? Draw feynman diagrams.
(c) Find the distance traveled by 1s and 4s.
(d) Why is asymmetry useful here? Find ##\beta##. Find ##E_+, E_-, \beta##.
Homework Equations
The Attempt at a Solution
Part(a)[/B]
Feynman diagrams are given by
Decay to other ##q \bar q## is cabbibo suppressed by ##\sin \theta_c##.
I'm not sure why the width at 4s is particularly wide.
Part(b)
Weak interactions. Only weak interactions are possible as the flavour is not conserved. Feynman diagrams are shown below:
Part(c)
How can I work out ##c\tau## if I don't even have their lifetimes?