A binned Dalitz plot analysis of B±→DK± decays, with D→KS0π+π- ; D→KS0K+K-, is performed to measure the CP-violating observables x± ; y± which are sensitive to the CKM angle γ. The analysis exploits 1.0 fb-1 of data collected by the LHCb experiment. The study makes no model-based assumption on the variation of the strong phase of the D decay amplitude over the Dalitz plot, but uses measurements of this quantity from CLEO-c as input. The values of the parameters are found to be x-=(0.0±4.3±1.5±0.6)×10-2, y-=(2.7±5.2±0.8±2.3)×10-2, x+=(-10.3±4.5±1.8±1.4)×10-2 ; y+=(-0.9±3.7±0.8±3.0)×10-2. The first, second, ; third uncertainties are the statistical, the experimental systematic, ; the error associated with the precision of the strong-phase parameters measured at CLEO-c, respectively. These results correspond to γ=(44-38+43)°, with a second solution at γ→γ+180°, ; rB=0.07±0.04, where rB is the ratio between the suppressed ; favoured B decay amplitudes. © 2012 CERN.

A model-independent Dalitz plot analysis of B±→DK± with D→KS0h+h- (h=π, K) decays ; constraints on the CKM angle γ

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012-01-01

Abstract

A binned Dalitz plot analysis of B±→DK± decays, with D→KS0π+π- ; D→KS0K+K-, is performed to measure the CP-violating observables x± ; y± which are sensitive to the CKM angle γ. The analysis exploits 1.0 fb-1 of data collected by the LHCb experiment. The study makes no model-based assumption on the variation of the strong phase of the D decay amplitude over the Dalitz plot, but uses measurements of this quantity from CLEO-c as input. The values of the parameters are found to be x-=(0.0±4.3±1.5±0.6)×10-2, y-=(2.7±5.2±0.8±2.3)×10-2, x+=(-10.3±4.5±1.8±1.4)×10-2 ; y+=(-0.9±3.7±0.8±3.0)×10-2. The first, second, ; third uncertainties are the statistical, the experimental systematic, ; the error associated with the precision of the strong-phase parameters measured at CLEO-c, respectively. These results correspond to γ=(44-38+43)°, with a second solution at γ→γ+180°, ; rB=0.07±0.04, where rB is the ratio between the suppressed ; favoured B decay amplitudes. © 2012 CERN.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179761
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