Measurement of B (D +   + )

1. Measurement of B(D+ + ) Sadia Khalil & Sheldon Stone Syracuse University 05/30/2007

2. Method Look for D-D+ +  K+- - K+- - 0 Ks - Ks- - + Ks- 0 K+ K -- We also looked at, K+- - Ks - K+ K --0 Signal Tags

3. Data 43 (117 pb-1)

4. Mbc distributions

5. How to count the Tags? • For signal require E to be within 2.5 . • Fit the Mbc distributions using Crystal Ball • function for the signal and Argus function for the • background • Fix the background shape parameters by fitting the E sidebands, defined as 5 < |E| <7 using the Argus function. • Count the events within 3 of the Mbc distribution.

6. Number of Tags

7. D+  +  Selection Criteria • Search for events with a single additional charged track on the • ‘otherside’ • Calculate the Missing Mass squared, • MM2 = (Ebeam - E + )2 – (-pD- - p +)2 • Veto events with additional charged tracks arising from the event vertex or having a maximum neutral energy cluster of more than 250 MeV to reduce D+  +0 events • Muon candidate is required to be within barrel region, • |cos|<0.81 and deposit less than 300 MeV of energy in the • calorimeter, characteristic of a minimum ionizing particle

8. Signal Events = 15

9. Comparison

10. Data 31-43 (398 pb-1)

11. Mbc distributions

12. Number of Tags

13. Signal Events = 66

14. An effort to look for some other modes@281pb-1 E plot for K+ K -- 0 E plot for Ks-  # of Events/20MeV

15. Mbc for K+-- Signal MC Data @281 pb-1 # of Events/0.6MeV

16. Next! • Estimate the backgrounds on the signal side. • Keep on looking for more new modes, e.g; D- K+---+ • and D- Ks-0 0

17. E Sidebands

18. E Sidebands