measurement of b (d + + ) sadia khalil & sheldon stone syracuse university 12/07/2007
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Measurement of B(D+ + )
Sadia Khalil & Sheldon Stone
Syracuse University 12/07/2007
Number of Tags(707 pb-1)
Mode Mbc cuts Signal BackgroundK+ - - 1.8655<Mbc<1.8747 186,943 3,812
K+ - - 0 1.8644<Mbc<1.8754 59,574 26,219
Ks - 1.8658<Mbc<1.8747 22,963 1,119
Ks - - + 1.8656<Mbc<1.8732 49,346 18,648
Ks - 0 1.8650<Mbc<1.8752 6,839 10,551
K+ K -- 1.8657<Mbc<1.8748 13,431 16,124
Total 342,165 62,913
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 347297±677±2223
103
MM2 Plot
MM2 of + (Data) Case1
+
+ , +→ +
+ 0
K0 +
+ 0, 0 + , (+ , +→ + )
& (+ , +→ + )
MM2 of + and + (Data) Case1
+
+ , +→ +
+ 0
K0 +
+ 0, 0 + , (+ , +→ + )
& (+ , +→ + )
MM2 of + (Data) Case2
+
+ , +→ +
+ 0
K0 +
+ 0, 0 + , (+ , +→ + )
& (+ , +→ + )
MM2 of + (Data) Case2
+
+ , +→ +
+ 0
K0 +
+ 0, 0 + , (+ , +→ + )
& (+ , +→ + )
BackGround StudiesE Side bands (Data)
•Cont SkimMC
•Radret SkimMC
•DDbar SkimMC
-0.05<MM2<0.05
Side Bands Signal Region
Cont 0.84 ± 0.40 0.76 ± 0.38
D0D0 0.63 ± 0.33 0.17 ± 0.17
OtherD+D- 0.00 ± 0.00 0.51 ± 0.30
Radret 0.00 ± 0.00 0.00 ± 0.00
Data 0.00 ± 0.00
Backgrounds from MM2 for D+ → +
Case1 (Ecc<300MeV)
0.05<MM2<0.175
Case2 (Ecc>300MeV)
-0.05<MM2<0.175Side Bands Signal Region Side Bands Signal Region
Cont 4.48 ± 0.92 1.34 ± 0.50 6.37 ± 1.10 1.72 ± 0.57
D0D0 1.17 ± 0.45 1.03 ± 0.42 0.17 ± 0.17 0.00 ± 0.00
OtherD+D- 0.00 ± 0.00 0.00 ± 0.00 0.00 ± 0.00 0.00 ± 0.00
Radret 0.00 ± 0.00 0.00 ± 0.00 0.20 ± 0.20 0.20 ± 0.20
Data 6.60 ± 2.57 4.71 ± 2.17
Backgrounds from MM2 for D+ → +
8.04 events 7.69 events
(Data)
MM2 Plots
(Cont31-44) MM2 Plots from Side Bands
36.9 Events
37.3 Events
-1(Cont) ( )
2
2
14.5(nb) 706.62(pb ) 0.191
Event Processed in MC 53,111125
No of Events for case1 (-0.1 MM 0.2) 7.05 1.16
No of Events for case2 (-0.1 MM 0.2) 7.12 1.17
Datafactor
LN
Cont (31-44) (within Signal E and Mbc)
19 Events
15 Events
-1(Cont) ( )
2
2
14.5(nb) 706.62(pb ) 0.191
Event Processed in MC 53,111125
No of Events for case1 (-0.1 MM 0.2) 3.63 0.83
No of Events for case2 (-0.1 MM 0.2) 2.86 0.74
Datafactor
LN
Radret
MM2 Plots from Side Bands (Scaled to bgd under the D peak)
0 Events
1.5 Events
-1(radret) ( )
2
2.7(nb) 706.62(pb ) 0.204
Event Processed in MC 9,327911
No of Events for case2 (-0.1 MM 0.2) 0.31 0.25
Datafactor
LN
0 Events
1 Events
Radret
GenMC (within Signal E and Mbc)
-1(radret) ( )
2
2.7(nb) 706.62(pb ) 0.204
Event Processed in MC 9,327911
No of Events for case2 (-0.1 MM 0.2) 0.20 0.20
Datafactor
LN
12 Events
D0 D0 (20xL44+30xL31 = 4.1 fb-1)
MM2 Plots from Side Bands (Scaled to Bgd under the D peak)
-1( )(DD)
2
2
6.23(nb) 706.62(pb ) 0.171
Event Processed in MC 25,688324
No of Events for case1 (-0.1 MM 0.2) 2.05 0.59
No of Events for case1 (-0.1 MM 0.2) 0.17 0.17
Data
factor
LN
1 Event
D0D0 SkimMC (within Signal E and Mbc)
10 Events
-1( )(DD)
2
2
6.23(nb) 706.62(pb ) 0.171
Event Processed in MC 25,688324
No of Events for case1 (-0.1 MM 0.2) 1.71 0.54
No of Events for case1 (-0.1 MM 0.2) 0.00 0.00
Data
factor
LN
0 Events
1 Events
MM2 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
-1( )(DD)
2
2
6.23(nb) 706.62(pb ) 0.171
Event Processed in MC 25,688324
No of Events for case1 (-0.1 MM 0.2) 0.17 0.17
No of Events for case2 (-0.1 MM 0.2) 0 0
Data
factor
LN
4 Events
D+D- SkimMC (within Signal E and Mbc)
-1( )(DD)
2
2
6.23(nb) 706.62(pb ) 0.171
Event Processed in MC 25,688324
No of Events for case1 (-0.1 MM 0.2) 0.68 0.24
No of Events for case2 (-0.1 MM 0.2) 0.0 0.0
Data
factor
LN
0 Events
Case1 Case2
Side Bands Signal Region Side Bands Signal Region
Cont 7.05 ± 1.16 3.63 ± 0.83 7.12 ± 1.17 2.86 ± 0.74
D0D0 2.05 ± 0.59 1.71 ± 0.54 0.17 ± 0.17 0.00
OtherD+D- 0.17 ± 0.17 0.68 ± 0.24 0.00 0.00
Radret 0.00 0.00 0.20 ± 0.21 0.10 ± 0.10
Data 8.04 ± 2.83 7.96 ± 2.82
Backgrounds from MM2 within -0.1<MM2<0.2
(Cont31-44)