LPNHE – Université de Paris VI & VII BABAR France. Orsay 20 novembre 2003 Guillaume Therin, Jacques Chauveau, Malcolm John Presente par J.C. Collaboration avec Royal Holloway P. Jackson, T. Mac Mahon, S. Ricciardi B B - - DK* DK* - - K K s - - CP=+/-1 CP=+/-1 Physique Physique Analyse K+K- Analyse K+K- Analyse CP=-1 Analyse CP=-1 Perspectives Perspectives
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LPNHE – Université de Paris VI & VII BABAR France. Orsay 20 novembre 2003
B - DK* - K s p - CP=+/-1. Physique Analyse K+K- Analyse CP=-1 Perspectives. LPNHE – Université de Paris VI & VII BABAR France. Orsay 20 novembre 2003 Guillaume Therin, Jacques Chauveau, Malcolm John Presente par J.C. - PowerPoint PPT Presentation
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LPNHE – Université de Paris VI & VII
BABAR France. Orsay 20 novembre 2003
Guillaume Therin, Jacques Chauveau, Malcolm John
Presente par J.C.
Collaboration avec Royal Holloway
P. Jackson, T. Mac Mahon, S. Ricciardi
BB- - DK* DK*- - K Kss- -
CP=+/-1CP=+/-1
PhysiquePhysique
Analyse K+K-Analyse K+K-
Analyse CP=-1Analyse CP=-1
PerspectivesPerspectives
G. Thérin B->DK* 2
Désintégrations des B en D K(*)http://lpnhe-babar.in2p3.fr/DK
A=A* BB
eiB→D0K
B eiA=A*
B*
A(B- →D
0 K- )
A(B+→D0K+)
K+-
Etats propres de CP
BF ≈ 1.5 x 10-4 BF = 3.8 x 10-2
BF = 3.7 x 10-4
Ks0
Ks0
Ks
KK+
BF ≈ 3 x 10-6
B-bu
cu
su
D0
K-Vcb
Vus
A
b
u
uD0
K-su
c Vub B-
BSC SC
DC CA Mauvais signes
• Triangles GLW• Triangles analogues pour ADS• Violation de CP directe,…• ou pas de violation de CP
• Objectif : Contraindre par des canaux sans pingouins.• Méthodes : • GLW prototype, faisable ?, amplitudes très différentes
• ADS très faibles rapports de branchement , amplitudes du même ordre.
Belle : A1 = -0.02+-0.33+-0.07
G. Thérin B->DK* 3
Analyse CP=+1
• Run 1 et 2 D0 -> K+K-
• Comparaisons données Monte Carlo
• Optimisation des coupures
• Statistiques attendues pour une expérience complètement simulée (FSE)
– Signal
– Bruits de fond
– bruit de fond doublement piquant
G. Thérin B->DK* 4
Data Sets
Data Sample Luminosity (fb-1)
00BB
BB 188
184
1250*
16400
CP Cocktail
KK Signal
93.4uds
92.9c
• We have all generic SP4 reconstructed with release 10
• Both data and generic MC taken from the Breco skims
• Enough generic to do a full simulated Experiment
• All yields are normalised to 73.4 fb-1-1
• We have all generic SP4 reconstructed with release 10
• Both data and generic MC taken from the Breco skims
• Enough generic to do a full simulated Experiment
• All yields are normalised to 73.4 fb-1-1
73.4On-Peak Data
8.6Off-Peak Data
G. Thérin B->DK* 5
Cut Optimization
Assumptions :
Method :
Assumptions :
Method :
• Cut variables uncorrelated with mes and E (checked).
• Good agreement between MC and Data
• For the optimization, mes is assumed to be uniform (BKGD) for (5.2 < mes < 5.29) GeV/c2
• Determine - NSIGNAL (signal MC)
- NBKGD (generic udscb)
found in the signal boxsignal box
E (
MeV
)
5.29MES (GeV/c2)
5.20 5.27
40
-40
BF(signal) = 7.10-7
G. Thérin B->DK* 6
No appreciable correlations between DE and All other cuts
Plots done on data with mes < Plots done on data with mes < 5.275.27
Plots done on data with mes < Plots done on data with mes < 5.275.27
G. Thérin B->DK* 7
Plots done on Data with |Plots done on Data with |E| > 0.04E| > 0.04Plots done on Data with |Plots done on Data with |E| > 0.04E| > 0.04
No appreciable correlations between mes and All other cuts
G. Thérin B->DK* 8
Off-peak data compared with generic udsc
Fair agreement between data and new qq MCFair agreement between data and new qq MCFair agreement between data and new qq MCFair agreement between data and new qq MC
Fit Fit on sidebands | on sidebands |E|> 60 MeV, E|> 60 MeV, then fit the fit the same shapesame shape on signal band |on signal band |E|<40 MeVE|<40 MeV
Fit Fit on sidebands | on sidebands |E|> 60 MeV, E|> 60 MeV, then fit the fit the same shapesame shape on signal band |on signal band |E|<40 MeVE|<40 MeV