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2 The CDF Experiment at Fermilab Contents - Harvard University ...

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94 Section 2: <strong>CDF</strong> Physics Analysis<br />

D s<br />

→ φπ, φ → K + K - / OS lepton<br />

Events / 10 MeV<br />

120<br />

100<br />

80<br />

60<br />

40<br />

130 ± 25 events<br />

20<br />

0<br />

1.75 1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2<br />

m(φπ) (GeV)<br />

Figure 46: Mass plot of D s ! ; ! K + K , with an opposite side lepton which could be<br />

used for a B avor tag.

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