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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20<br />
15<br />
10<br />
5<br />
0<br />
15<br />
10<br />
5<br />
0<br />
<strong>BABAR</strong><br />
Vertexing in J/ψ K + (K* 0 )<br />
Signal<br />
Sideband<br />
-0.2 0 0.2<br />
-0.2 0 0.2<br />
∆z(cm)<br />
∆z(cm)<br />
→ Machinery <strong>for</strong> vertexing works<br />
◆ Needs different test <strong>for</strong> per<strong>for</strong>mance<br />
Exercise vertexing using<br />
◆ B + → J/ψ K +<br />
◆ B 0 → J/ψ K* 0<br />
K + π −<br />
96±12 events in ~1 fb -1 data<br />
◆ S/B ~ 6<br />
∆z = z-distance between<br />
◆ fully-reconstructed B vertex<br />
◆ vertex <strong>of</strong> the rest <strong>of</strong> the event<br />
Signal - sideband agrees with<br />
MC (histogram)<br />
◆ Width comes from lifetime<br />
<strong>First</strong> <strong>Year</strong> <strong>of</strong> BaBar/<strong>PEP</strong>-<strong>II</strong> Masahiro Morii SLAC
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