Griffiths Introduction to Elementary Particles · Problem 2.9

Relativistic Kinematics — David J. Griffiths

Physics — QFT · ozi-rule-particle-decays

Problem

The upsilon meson,

b\bar{b}

, is the bottom-quark analog to the

\psi

c\bar{c}

. Its mass is 9460 MeV/

c^2

, and its lifetime is

1.5 \times 10^{-20}

sec. From this information, what can you say about the mass of the

B

meson,

u\bar{b}

? (The observed mass is 5270 MeV/

c^2