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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Inclusive K S →π + π − Reconstruction<br />
Selection:<br />
◆ 2 oppositely-charged<br />
tracks. → Fit a vertex.<br />
◆ P(χ 2 ) > 0.01.<br />
◆ Angle α between p(K S )<br />
and the flight path:<br />
cosα > 0.999.<br />
Double Gaussian fit:<br />
◆ m(K S ) = 498.94 ± 0.12<br />
MeV/c 2 .<br />
◆ σ 1 = 2.8 MeV/c 2 (69%).<br />
◆ σ 2 = 11 MeV/c 2 (31%).<br />
N(π + π - ) candidates/1.7 MeV<br />
300<br />
200<br />
100<br />
<strong>BABAR</strong><br />
0<br />
0.45 0.475 0.5 0.525 0.55<br />
M(π + π - ) (GeV)<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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