Trigger Workshop CalTech – 2 nd Dec 2004. 2 photon physics @ BaBar. Jamie Boyd. Introduction. PEP-II is a: B-Factory / Charm Factory / Tau Factory Also a 2 Photon Physics Factory Little 2 Photon analysis done to date with BaBar data though
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Trigger Workshop CalTech – 2nd Dec 2004
2 photon physics @ BaBar
pi+ pi- MC (not near threshold – see next slide)
all from BGF
2 Track data (Etot<8GeV, Ntrack = 2, Sum of Pt <0.2, track mass set to Kaon mass )
Pt ~ sqrt((W/2)2 - mK2)sin θ
Turn on different
in MC and data
(only data shown
Other L1 lines
contribute to the
similar Pt turn on
Can we edit this or write a new one with better efficiency?
Put a total Energy cut on to kill BhaBha’s?
Tagged pi+pi- MC where all 3 tracks are reconstructed
All 4 gammas reconstructed
L3 eff low for
BGFAN eff lowish
Can we do pi0
making in L3?
& in BGFAN?
All 4 gammas and tagged electron reconstructed
Presence of tag
L3 eff but now
we don’t pass