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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D* Signal and Vertexing<br />
N events/200 keV<br />
200<br />
100<br />
<strong>BABAR</strong><br />
Be<strong>for</strong>e refit<br />
σ 1<br />
=354 keV (27%)<br />
σ 2<br />
=908 keV (73%)<br />
◆ ∆m resolution improves with beam<br />
pr<strong>of</strong>ile constraint<br />
Entries/0.1 ps<br />
60<br />
~220 pb-1<br />
<strong>BABAR</strong><br />
40<br />
N events/200 keV<br />
0<br />
300<br />
200<br />
0.14 0.145 0.15 0.155<br />
m(Kππ) - m(Kπ)<br />
GeV<br />
<strong>BABAR</strong><br />
After refit<br />
σ 1<br />
=280 keV (47%)<br />
σ 2<br />
=679 keV (53%)<br />
20<br />
0<br />
-3 -2 -1 0 1 2 3<br />
Candidate D 0 → kπ proper decay time (ps)<br />
100<br />
N(D 0 ) 668 ± 33<br />
N(bkg) 79 ± 11<br />
0<br />
0.14 0.145 0.15 0.155<br />
m(Kππ) - m(Kπ)<br />
GeV<br />
τ(D 0 )<br />
σ(t)<br />
407 ± 25 ps<br />
437 ± 25 ps<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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