First observation of the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay

Abstract

The $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay is observed for the first time using proton-proton collision data collected by the LHCb detector at centre-of-mass energies of $7$, $8$ and $13\text{TeV}$, corresponding to an integrated luminosity of $9{\text{fb}}^{-1}$. Its branching fraction relative to that of the $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decay is measured to be $$\frac{B\left(B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}\right)}{B\left(B^{+}\to D^{+}{D}^{-}{K}^{+}\right)}=0.525\pm 0.033\pm 0.027\pm 0.034,$$ where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the $D_s^{\pm }\to K^{\mp }{K}^{\pm }{\pi }^{\pm }$ and $D^{\pm }\to K^{\mp }{\pi }^{\pm }{\pi }^{\pm }$ decays. This measurement fills an experimental gap in the knowledge of the family of Cabibbo$-$favoured $\bar{b}\to \bar{c}c\bar{s}$ transitions and opens the path for unique studies of spectroscopy in future.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-019.html (LHCb public pages)

References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Performance of the LHCb Vertex Locator
• Measurement of the Absolute Branching Fractions for $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ and Extraction of the Decay Constant $f_{D_s}$
• Kernel density estimation of a multidimensional efficiency profile
• Observation of a resonant structure near the $D_s^{+}{D}_s^{-}$ threshold in the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay
• Dalitz plot analyses of $B^0\to D^{-}{D}^0{K}^{+}$ and $B^{+}\to {\overline{D}}^0{D}^0{K}^{+}$ decays
• Observation of a new excited $D_s^{+}$ meson in $B^0\to D^{-}{D}^{+}{K}^{+}{\pi }^{-}$ decays
• Measurement of the B -> Dbar(*)D(*)K branching fractions
• Study of the decays B->D_s1(2536)+ anti-D(*)
• First observation of the decay $B^0\to D^0\overline{D}{}^0{K}^{+}{\pi }^{-}$

Cited by in corpus (3)

• Observation of a resonant structure near the $D_s^{+}{D}_s^{-}$ threshold in the $B^{+}\to D_s^{+}{D}_s^{-}{K}^{+}$ decay
• Classification of Coupled-Channel Near-Threshold Structures
• Decoding the near-threshold $X_{0,1}(4140)$ and $X_1(4685)$ states via OZI-suppressed coupled-channel scattering