1. Radia 1 group Mtg, 05/10/2006 D S Selection Loose cut on D s Mbc, Introduction At the 4170, the  * was proven to decay mostly into D * D *, DD *, and D s D s * Directly produced D s  Narrow M BC, the indirect D s  Wide M BC (  smearing) Then plot

2. Radia 2 group Mtg, 05/10/2006 Tag Selection Indirect Ds direct Ds D S + D S - Events peak at the right Ds mass Indirect Ds

3. Radia 3 group Mtg, 05/10/2006 D S +  , from D S + D S - Mbc (GeV) # of Events / 2MeV |  E| < 18.2 MeV (98.8% of the area under the  E distribution, i.e. 2.5  ) yield = 40.3 ± 7.6  = (41.0 ± 0.5)%

4. Radia 4 group Mtg, 05/10/2006  he  e + e -  Ds + Ds - Cross Section Mbc (GeV) # of Events / 2MeV Invariant Mass (GeV) D S +  , from D S + D S -* D S +  , from D S + D S - yield = 40.3 ± 7.6  = (41.0 ± 0.5)% yield = 1038.3 ± 34.6  = (41.6 ± 0.5)%  (e + e -  Ds + Ds - )/  (e + e -  Ds + Ds -* ) = ( 3.93 ± 0.76 )%

5. Radia 5 group Mtg, 05/10/2006 Ds + Ds - KK   |  E| < 18.2 MeV (98.8% of the area under the  E distribution, i.e. 2.5  ) Invariant Mass (GeV) # of Events / 2MeV

6. Radia 6 group Mtg, 05/10/2006 ADDITIONAL SLIDES

7. Radia 7 group Mtg, 05/10/2006 Invariant Mass of D s Tags from DATA K-p+p0 K-p+p0 Total Number of Tags = (5067 ± 112) The signal region is defined as containing 98.8% (2.5 r.m.s widths) of the signal events with invariant mass below and above the D s peak.

8. Radia 8 group Mtg, 05/10/2006 DsDs Kkpi dele 6mev phipi dele 6mev Kkpi dele 18.2mev phipi dele 18.2mev