First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
First Year of BABAR/PEP-II - Harvard University Laboratory for ...
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J/ψ, ψ', ...<br />
c c<br />
b<br />
s<br />
B 0<br />
d<br />
d<br />
Example: B 0 → J/ψ K S<br />
b → ccs Modes<br />
K 0 s , K0 L , K0 *<br />
“Penguin”<br />
b<br />
d<br />
c<br />
c<br />
s<br />
d<br />
* V td<br />
* V cb<br />
* V cs<br />
⎛<br />
λ (–<br />
1) V tb ⎞⎛V --------------- cs ⎞⎛V ⎜ ⎟ ---------------- cd ⎞<br />
=<br />
⎜ ⎟⎜----------------⎟<br />
* * *<br />
⎝V tb<br />
V td<br />
⎠⎝V cs<br />
V cb<br />
⎠⎝V cd<br />
V cs<br />
⎠<br />
A CP () t = sin2βsin( ∆m⋅<br />
t)<br />
B-mix B-decay K-mix<br />
Is this single-diagram decay?<br />
◆ Good approximation: the dominant penguin diagram has the same<br />
phase as the tree diagram.<br />
Gold-plated mode: theoretically clean.<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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