We report the first observation of the decays $B^{+}\to {\mathrm{\Sigma }}_c(2455{)}^{++}{\overline{\mathrm{\Xi }}}_c^{\prime -}$ and $B^0\to {\mathrm{\Sigma }}_c(2455{)}^0{\overline{\mathrm{\Xi }}}_c^{\prime 0}$, with significances of $6.4\sigma$ and $5.3\sigma$, respectively, including systematic uncertainties. This analysis is based on data samples containing $771.6\times {10}^6$ $\mathrm{\Upsilon }(4S)$ decays collected with the Belle detector at the KEKB collider and $520.6\times {10}^6$ $\mathrm{\Upsilon }(4S)$ decays collected with the Belle II detector at the SuperKEKB collider. The branching fractions are measured to be $\mathcal{B}(B^{+}\to {\mathrm{\Sigma }}_c(2455{)}^{++}{\overline{\mathrm{\Xi }}}_c^{\prime -})=(1.69\pm 0.31\pm 0.12_{-0.56}^{+1.39})\times {10}^{-3}$ and $\mathcal{B}(B^0\to {\mathrm{\Sigma }}_c(2455{)}^0{\overline{\mathrm{\Xi }}}_c^{\prime 0})=(1.28\pm 0.32\pm 0.10_{-0.22}^{+0.26})\times {10}^{-3}$, where the first and second uncertainties are statistical and systematic, respectively, and the third arises from the uncertainties in the absolute branching fractions of ${\overline{\mathrm{\Xi }}}_c^{-}$ and ${\overline{\mathrm{\Xi }}}_c^0$ decays. This result represents the first observation of $B$-meson decays into a pair of charmed baryon-antibaryon states belonging to the same $SU(3)$ flavor sextet.

Close

PrevNext

Reuse & PermissionsView figure in article

• 
• 
• 
• 

• Particle decays
• Baryons
• Hadrons
• Mesons