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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Candidates / 10 MeV/c 2<br />
60<br />
40<br />
20<br />
<strong>BABAR</strong><br />
σ = 16 MeV<br />
J/ψ → l + l - Signal<br />
J/ψ → e + e - (~540 pb -1 ) J/ψ →µ + µ - (~380 pb -1 )<br />
Candidates / 10 MeV/c 2<br />
100<br />
75<br />
50<br />
25<br />
J/ψ → µ + µ -<br />
<strong>BABAR</strong><br />
σ = 15 MeV<br />
J/ψ → e + e - m(e + e - )<br />
0<br />
2.6 2.8 3 3.2 3.4<br />
m(e + e - )<br />
GeV/c 2<br />
→ Already reasonable, but can be improved<br />
0<br />
2.6 2.8 3 3.2 3.4<br />
m(µ + µ - )<br />
GeV/c 2<br />
Tail due to Bremsstrahlung Background due to muon ID<br />
◆ Efficiency consistent with expectation<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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