Measurement of the CKM angle <i>γ</i> using <i>B</i> <SUP>0</SUP> → <i>DK</i> <SUP>*0</SUP> with <i>D</i> → <i>K</i><sub>S</sub><SUP>0</SUP> <i>π</i> <SUP>+</SUP> <i>π</i> <SUP>-</SUP> decays

Aaij, R, Abellan Beteta, C, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S
et al (show 709 more authors) (2016) Measurement of the CKM angle <i>γ</i> using <i>B</i> <SUP>0</SUP> → <i>DK</i> <SUP>*0</SUP> with <i>D</i> → <i>K</i><sub>S</sub><SUP>0</SUP> <i>π</i> <SUP>+</SUP> <i>π</i> <SUP>-</SUP> decays. JOURNAL OF HIGH ENERGY PHYSICS, 2016 (8). 137-.

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A model-dependent amplitude analysis of the decay $B^0\rightarrow D(K^0_S\pi^+\pi^-) K^{*0}$ is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb$^{-1}$, recorded at $\sqrt{s}=7$ and $8 TeV$ by the LHCb experiment. The CP violation observables $x_{\pm}$ and $y_{\pm}$, sensitive to the CKM angle $\gamma$, are measured to be \begin{eqnarray*} x_- &=& -0.15 \pm 0.14 \pm 0.03 \pm 0.01, y_- &=& 0.25 \pm 0.15 \pm 0.06 \pm 0.01, x_+ &=& 0.05 \pm 0.24 \pm 0.04 \pm 0.01, y_+ &=& -0.65^{+0.24}_{-0.23} \pm 0.08 \pm 0.01, \end{eqnarray*} where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the $D\rightarrow K^0_S \pi^+\pi^-$ amplitude model. These are the most precise measurements of these observables. They correspond to $\gamma=(80^{+21}_{-22})^{\circ}$ and $r_{B^0}=0.39\pm0.13$, where $r_{B^0}$ is the magnitude of the ratio of the suppressed and favoured $B^0\rightarrow D K^+ \pi^-$ decay amplitudes, in a $K\pi$ mass region of $\pm50 MeV$ around the $K^*(892)^0$ mass and for an absolute value of the cosine of the $K^{*0}$ decay angle larger than $0.4$.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at
Uncontrolled Keywords: B physics, CKM angle gamma, CP violation, Flavor physics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 06 Oct 2016 08:13
Last Modified: 15 Mar 2024 00:13
DOI: 10.1007/JHEP08(2016)137
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