D→Kπππ Decays and a Measurement of the
CKM angle γLauren Martin, University of Oxford
Importance of Measuring γ
γγ
γγ
γγ‘’
⇒γγ
Measurement of γusing B±→DK±
γγγB±→D0K±
D0γγ
γγγ⇒‘’
γγD0
γγ
‘ADS’ method
• ‘’D0γγ. K+π−
• γγγ
• γγγγ
Four-Body ADS →
D0
D0
γγ
γ
CLEO-c Measurement of RK3π
δK3π RK3π
γγ
+- →→
γγδK3π
RK3π
γγ
γγ
Preliminary Results
• Kπππ VS CP RK3π δK3π γγγ
• Kπππ VS Kπππ RK3π )2 RK3π
γ• Kπππ VS Kπ RK3π
δK3πδKπ
• δKπ
Impact on LHCb
• The figure illustrates the impact of the results on the sensitivity to γ at LHCb
• Sensitivity to γ dependent on δDKπ, the
sensitivty to γ increases by ∼ 2o due to these measurements
Dalitz Analysis
’γ
γγγ
γ
γγ€
D0 → K −π +π +π −
€
D 0 → K −π +π +π −
€
KSππ
CLEO-c Measurements
γ
γγ
γ
08/12/07
CP even tagged Flavor TaggedCP odd tagged
€
M2
π +π −
€
(770)
D decay Model
Summary & Conclusions
γ
γ
γ
γ