Measurement of B (D +   + ) Sadia Khalil & Sheldon Stone Syracuse University 12/07/2007

Number of Tags(707 pb -1 ) ModeM bc cutsSignalBackground K +  -  <M bc < ,9433,812 K+ - - 0K+ - -  <M bc < ,57426,219 K s  <M bc < ,9631,119 K s  -  -  <M bc < ,34618,648 K s  -  <M bc < ,83910,551 K + K -  <M bc < ,43116,124 Total342,16562,913 After a correction of 1.5±0.64 % based on the fact it is easier to find tags in  + events than in generic decays, the total # of tags is ±677±2223

103 MM 2 Plot

MM 2 of  + (Data) Case1  +  +,  + →  + + 0+ 0 K0 +K0 +  +  0,  0  +, (  +,  + →  + ) & (  +,  + →  + )

MM 2 of  + and  + (Data) Case1  +  +,  + →  + + 0+ 0 K0 +K0 +  +  0,  0  +, (  +,  + →  + ) & (  +,  + →  + )

MM 2 of  + (Data) Case2  +  +,  + →  + + 0+ 0 K0 +K0 +  +  0,  0  +, (  +,  + →  + ) & (  +,  + →  + )

MM 2 of  + (Data) Case2  +  +,  + →  + + 0+ 0 K0 +K0 +  +  0,  0  +, (  +,  + →  + ) & (  +,  + →  + )

BackGround Studies  E Side bands (Data) Cont SkimMC Radret SkimMC DDbar SkimMC

- 0.05<MM 2 <0.05 Side BandsSignal Region Cont0.84 ± ± 0.38 D0D0D0D ± ± 0.17 OtherD + D ± ± 0.30 Radret0.00 ± 0.00 Data0.00 ± 0.00 Backgrounds from MM 2 for D + →  +

Case1 (E cc <300MeV) 0.05<MM 2 <0.175 Case2 (E cc >300MeV) -0.05<MM 2 <0.175 Side BandsSignal RegionSide BandsSignal Region Cont4.48 ± ± ± ± 0.57 D0D0D0D ± ± ± ± 0.00 OtherD + D ± 0.00 Radret0.00 ± ± 0.20 Data6.60 ± ± 2.17 Backgrounds from MM 2 for D + →  +

8.04 events 7.69 events (Data) MM 2 Plots

(Cont31-44) MM 2 Plots from Side Bands 36.9 Events 37.3 Events

Cont (31-44) (within Signal  E and M bc ) 19 Events 15 Events

Radret MM 2 Plots from Side Bands (Scaled to bgd under the D peak) 0 Events 1.5 Events

0 Events 1 Events Radret GenMC (within Signal  E and M bc )

12 Events D 0 D 0 (20xL xL 31 = 4.1 fb -1 ) MM 2 Plots from Side Bands (Scaled to Bgd under the D peak) 1 Event

D 0 D 0 SkimMC (within Signal  E and M bc ) 10 Events 0 Events

1 Events MM 2 Plots from Side Bands (Scaled to Bgd under the D peak) OtherD + = One side is Tag mode and the ‘otherside’ decays to D+ which is not a signal and any of the known backgrounds

4 Events D + D - SkimMC (within Signal  E and M bc ) 0 Events

Case1Case2 Side BandsSignal RegionSide BandsSignal Region Cont7.05 ± ± ± ± 0.74 D0D0D0D ± ± ± OtherD + D ± ± Radret ± ± 0.10 Data8.04 ± ± 2.82 Backgrounds from MM 2 within -0.1<MM 2 <0.2

(Cont31-44)