Measurement of the CKM angle γusing B^\pm --> D K^\pm with D-->K_Sπ^+π^-, K_SK^+K^- decays

Abstract

A binned Dalitz plot analysis of $B^{\pm }\to D{K}^{\pm }$ decays, with $D\to K_S{\pi }^{+}{\pi }^{-}$ and $D\to K_S{K}^{+}{K}^{-}$, is performed to measure the \CP-violating observables $x_{\pm }$ and $y_{\pm }$, which are sensitive to the Cabibbo-Kobayashi-Maskawa angle $\gamma$. The analysis exploits a sample of proton-proton collision data corresponding to 3.0\invfb collected by the LHCb experiment. Measurements from CLEO-c of the variation of the strong-interaction phase of the $D$ decay over the Dalitz plot are used as inputs. The values of the parameters are found to be $x_{+}=(-7.7\pm 2.4\pm 1.0\pm 0.4)\times 10^{-2}$, $x_{-}=(2.5\pm 2.5\pm 1.0\pm 0.5)\times 10^{-2}$, $y_{+}=(-2.2\pm 2.5\pm 0.4\pm 1.0)\times 10^{-2}$, and $y_{-}=(7.5\pm 2.9\pm 0.5\pm 1.4)\times 10^{-2}$. The first, second, and third uncertainties are the statistical, the experimental systematic, and that associated with the precision of the strong-phase parameters. These are the most precise measurements of these observables and correspond to $\gamma =(62_{-14}^{+15}{)}^{\circ }$, with a second solution at $\gamma \to \gamma +180^{\circ }$, and $r_B=0.080_{-0.021}^{+0.019}$, where $r_B$ is the ratio between the suppressed and favoured $B$ decay amplitudes.

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Measurement of phi_3 with Dalitz plot analysis of B+ -> D(*)K(*)+ decay
• Evidence for direct CP violation in the measurement of the Cabibbo-Kobayashi-Maskawa angle gamma with B-+ --> D(*) K(*)-+ decays
• First Measurement of phi_3 with a Model-independent Dalitz Plot Analysis of B->DK, D->KsPiPi Decay
• Measurement of $CP$ asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays
• A model-independent Dalitz plot analysis of $B^{\pm }\to D{K}^{\pm }$ with $D\to K_{\mathrm{S}}^0{h}^{+}{h}^{-}$ ($h=\pi ,K$) decays and constraints on the CKM angle $\gamma$
• Measurement of $CP$ violation and constraints on the CKM angle $\gamma$ in $B^{\pm }\to D{K}^{\pm }$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays
• Analysis Tools for Next-Generation Hadron Spectroscopy Experiments
• Measurement of CP violation parameters in B0->D K*0 decays
• Contributions to the width difference in the neutral $D$ system from hadronic decays
• Measurement of CP asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays

Cited by in corpus (26)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Model-independent determination of the relative strong-phase difference between $D^0$ and ${\bar{D}}^0\to K_{S,L}^0{\pi }^{+}{\pi }^{-}$ and its impact on the measurement of the CKM angle $\gamma /{\varphi }_3$
• The CKM Parameters
• Determination of strong-phase parameters in $D\to K_{S,L}^0{\pi }^{+}{\pi }^{-}$
• CP violation in the B system
• Direct CP violation in beauty and charm hadron decays
• A study of $CP$ violation in $B^{\mp }\to D{h}^{\mp }$ ($h=K,\pi$) with the modes $D\to K^{\mp }{\pi }^{\pm }{\pi }^0$, $D\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $D\to K^{+}{K}^{-}{\pi }^0$
• Flavor Physics and CP Violation
• Study of $B^{-}\to D{K}^{-}{\pi }^{+}{\pi }^{-}$ and $B^{-}\to D{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decays and determination of the CKM angle $\gamma$
• Model independent determination of the CKM phase $\gamma$ using input from $D^0-{\bar{D}}^0$ mixing
• Model-independent measurement of the CKM angle $\gamma$ using $B^0\to D{K}^{\ast 0}$ decays with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ and $K_S^0{K}^{+}{K}^{-}$
• Measurement of $CP$ observables in $B^{\pm }\to D{K}^{\ast \pm }$ decays using two- and four-body $D$ final states
• Heavy Flavour Physics at the LHC
• Electroweak effects in the extraction of the CKM angle $\gamma$ from $B\to D\pi$ decays
• Optimising sensitivity to $\gamma$ with $B^0\to D{K}^{+}{\pi }^{-}$, $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ double Dalitz plot analysis
• Measurement of the CKM angle $\gamma$ using $B^0\to D{K}^{\ast 0}$ with $D\to K_S^0{\pi }^{+}{\pi }^{-}$ decays
• Study of CKM angle $\gamma$ sensitivity using flavor untagged $B_s^0\to {\tilde{D}}^{(\ast )0}\varphi$ decays
• Experimental Status of the CKM Matrix
• Origins of the method to determine the CKM angle $\gamma$ using $B^{\pm }\to D{K}^{\pm }$, $D\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$ decays
• CP violation and CKM studies (and first LHCb Run II results)
• Constrain the UT angle $\gamma$ by CP violation parameters in $B^0\to {\pi }^{+}{\pi }^{-}$
• Toward extracting $\gamma$ from $B\to DK$ without binning
• CKM studies from b physics at hadron machines