We report a study of the suppressed $B^-\to DK^-\pi^+\pi^-$ and favored $B^-\to D\pi^-\pi^+\pi^-$ decays, where the neutral $D$ meson is detected through its decays to the $K^{\mp}\pi^{\pm}$ and CP-even $K^+K^-$ and $\pi^+\pi^-$ final states. The measurement is carried out using a proton-proton collision data sample collected by the LHCb experiment, corresponding to an integrated luminosity of 3.0 fb$^{-1}$. We observe the first significant signals in the CP-even final states of the $D$ meson for both the suppressed $B^-\to DK^-\pi^+\pi^-$ and favored $B^-\to D\pi^-\pi^+\pi^-$ modes, as well as in the doubly Cabibbo-suppressed $D\to K^+\pi^-$ final state of the $B^-\to D\pi^-\pi^+\pi^-$ decay. Evidence for the ADS suppressed decay $B^{-}\to DK^-\pi^+\pi^-$, with $D\to K^+\pi^-$, is also presented. From the observed yields in the $B^-\to DK^-\pi^+\pi^-$, $B^-\to D\pi^-\pi^+\pi^-$ and their charge conjugate decay modes, we measure the value of the weak phase to be $\gamma=(74^{+20}_{-19})^{\rm o}$. This is one of the most precise single-measurement determinations of $\gamma$ to date.
Signal efficiencies for the $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_d^-$ decay when applying the GLW and ADS selections. The efficiencies are shown as a function of five different two- and three-body masses. |
EffOve[..].pdf [24 KiB] HiDef png [261 KiB] Thumbnail [167 KiB] *.C file |
|
Signal efficiencies for the $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_s^-$ decay when applying the GLW and ADS selections. The efficiencies are shown as a function of five different two- and three-body masses. |
EffOve[..].pdf [23 KiB] HiDef png [253 KiB] Thumbnail [168 KiB] *.C file |
|
Signal distributions of the (left) $X_d^-$ invariant mass in $ B ^- \rightarrow DX_d^-$ decays and (right) $X_s^-$ invariant mass, in $ B ^- \rightarrow DX_s^-$ decays, for $D\rightarrow K ^- \pi ^+ $. The distributions are obtained using the sPlot method. In both cases, all selections, except the $M(X^-)<2$ $ {\mathrm{ Ge V /}c^2}$ and the $ K ^{*0} $ mass selection, are applied. The dip at 1.97 $ {\mathrm{ Ge V /}c^2}$ is due to the $ D ^+_ s $ meson veto. |
Xdm_mass.pdf [15 KiB] HiDef png [92 KiB] Thumbnail [48 KiB] *.C file |
|
Xsm_mass.pdf [16 KiB] HiDef png [105 KiB] Thumbnail [57 KiB] *.C file |
||
Mass distributions of $ B ^- \rightarrow DX_s^-$ candidates using the ADS selections, for (top left) $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_s^-$, (top right) $ B ^+ \rightarrow [ K ^+ \pi ^- ]_DX_s^+$, (bottom left) $ B ^- \rightarrow [ K ^+ \pi ^- ]_DX_s^-$, and (bottom right) $ B ^+ \rightarrow [ K ^- \pi ^+ ]_DX_s^+$. |
ADS_Km[..].pdf [25 KiB] HiDef png [328 KiB] Thumbnail [249 KiB] *.C file |
|
ADS_Kp[..].pdf [22 KiB] HiDef png [330 KiB] Thumbnail [250 KiB] *.C file |
||
ADS_Kp[..].pdf [25 KiB] HiDef png [319 KiB] Thumbnail [263 KiB] *.C file |
||
ADS_Km[..].pdf [25 KiB] HiDef png [331 KiB] Thumbnail [272 KiB] *.C file |
||
Mass distributions of $ B ^- \rightarrow DX_s^-$ candidates using the GLW selections, for (top left) $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_s^-$, (top right) $ B ^+ \rightarrow [ K ^+ \pi ^- ]_DX_s^+$, (middle left) $ B ^- \rightarrow [ K ^+ K ^- ]_DX_s^-$, (middle right) $ B ^+ \rightarrow [ K ^+ K ^- ]_DX_s^+$, (bottom left) $ B ^- \rightarrow [\pi ^+ \pi ^- ]_DX_s^-$, and (bottom right) $ B ^+ \rightarrow [\pi ^+ \pi ^- ]_DX_s^+$. |
GLW_kp[..].pdf [26 KiB] HiDef png [344 KiB] Thumbnail [259 KiB] *.C file |
|
GLW_kp[..].pdf [26 KiB] HiDef png [349 KiB] Thumbnail [261 KiB] *.C file |
||
GLW_kk[..].pdf [25 KiB] HiDef png [364 KiB] Thumbnail [279 KiB] *.C file |
||
GLW_kk[..].pdf [25 KiB] HiDef png [372 KiB] Thumbnail [282 KiB] *.C file |
||
GLW_pi[..].pdf [25 KiB] HiDef png [355 KiB] Thumbnail [279 KiB] *.C file |
||
GLW_pi[..].pdf [25 KiB] HiDef png [370 KiB] Thumbnail [290 KiB] *.C file |
||
Mass distributions of $ B ^- \rightarrow DX_d^-$ candidates using the ADS selections, for (top left) $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_d^-$, (top right) $ B ^+ \rightarrow [ K ^+ \pi ^- ]_DX_d^+$, (bottom left) $ B ^- \rightarrow [ K ^+ \pi ^- ]_DX_d^-$, and (bottom right) $ B ^+ \rightarrow [ K ^- \pi ^+ ]_DX_d^+$. |
ADS_Km[..].pdf [20 KiB] HiDef png [254 KiB] Thumbnail [199 KiB] *.C file |
|
ADS_Kp[..].pdf [20 KiB] HiDef png [258 KiB] Thumbnail [202 KiB] *.C file |
||
ADS_Kp[..].pdf [25 KiB] HiDef png [330 KiB] Thumbnail [267 KiB] *.C file |
||
ADS_Km[..].pdf [24 KiB] HiDef png [332 KiB] Thumbnail [267 KiB] *.C file |
||
Mass distributions of $ B ^- \rightarrow DX_d^-$ candidates using the GLW selections, for (top left) $ B ^- \rightarrow [ K ^- \pi ^+ ]_DX_d^-$, (top right) $ B ^+ \rightarrow [ K ^+ \pi ^- ]_DX_d^+$, (middle left) $ B ^- \rightarrow [ K ^+ K ^- ]_DX_d^-$, and (middle right) $ B ^+ \rightarrow [ K ^+ K ^- ]_DX_d^+$, (bottom left) $ B ^- \rightarrow [\pi ^+ \pi ^- ]_DX_d^-$, and (bottom right) $ B ^+ \rightarrow [\pi ^+ \pi ^- ]_DX_d^+$ |
GLW_kp[..].pdf [20 KiB] HiDef png [267 KiB] Thumbnail [208 KiB] *.C file |
|
GLW_kp[..].pdf [20 KiB] HiDef png [269 KiB] Thumbnail [210 KiB] *.C file |
||
GLW_kk[..].pdf [20 KiB] HiDef png [273 KiB] Thumbnail [207 KiB] *.C file |
||
GLW_kk[..].pdf [20 KiB] HiDef png [276 KiB] Thumbnail [210 KiB] *.C file |
||
GLW_pi[..].pdf [21 KiB] HiDef png [296 KiB] Thumbnail [223 KiB] *.C file |
||
GLW_pi[..].pdf [21 KiB] HiDef png [300 KiB] Thumbnail [226 KiB] *.C file |
||
Mass distributions for the suppressed ADS mode, $B^{\pm}\rightarrow [K^{\mp}\pi^{\pm}]_DK^{\pm}\pi^{\mp}\pi^{\pm}$ (sum of $ B ^+ $ and $ B ^- $). |
chgcom[..].pdf [25 KiB] HiDef png [322 KiB] Thumbnail [267 KiB] *.C file |
|
Projections of 1$-$CL versus (left) $\gamma$, (right) $r_B^{ B ^- \rightarrow D K ^- \pi ^+ \pi ^- }$, and (bottom) $r_B^{ B ^- \rightarrow D K ^- \pi ^+ \pi ^- }$ versus $\gamma$, using only $ B ^- \rightarrow \ D K ^- \pi ^+ \pi ^- $ decays, and the combination of $ B ^- \rightarrow \ D K ^- \pi ^+ \pi ^- $ and $ B ^- \rightarrow \ D\pi ^- \pi ^+ \pi ^- $ decays. The 68.3% and 95.5% confidence level (CL) limits are indicated for the $\gamma$ and $r_B$ projections. The 39% level contours in $r_B^{ B ^- \rightarrow D K ^- \pi ^+ \pi ^- }$ versus $\gamma$ correspond to the 68.3% level contours in the one-dimensional projections. |
gammac[..].pdf [15 KiB] HiDef png [280 KiB] Thumbnail [186 KiB] *.C file |
|
gammac[..].pdf [15 KiB] HiDef png [298 KiB] Thumbnail [208 KiB] *.C file |
||
rb_vs_g.pdf [15 KiB] HiDef png [181 KiB] Thumbnail [117 KiB] *.C file |
||
Animated gif made out of all figures. |
PAPER-2015-020.gif Thumbnail |
Fitted yields in the ADS modes with $f=K\pi$, for the signal and corresponding normalization modes. |
Table_1.pdf [74 KiB] HiDef png [72 KiB] Thumbnail [37 KiB] tex code |
|
Fitted yields used in the GLW analysis with $f=K^{\pm}\pi^{\pm}, K ^+ K ^- $ and $\pi ^+ \pi ^- $, for the signal and corresponding normalization modes. |
Table_2.pdf [74 KiB] HiDef png [91 KiB] Thumbnail [46 KiB] tex code |
|
Systematic uncertainties, in percent, on the fitted parameters. |
Table_3.pdf [64 KiB] HiDef png [68 KiB] Thumbnail [32 KiB] tex code |
Created on 02 May 2024.