First measurement of the ${\Lambda}_c^{+}$ → pη′ decay

Abstract

We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay ${\Lambda}_c^{+}$ → pη′ with η′ → ηπ⁺π⁻, using a data sample corresponding to an integrated luminosity of 981 fb⁻¹, collected by the Belle detector at the KEKB e⁺e⁻ asymmetric-energy collider. A significant ${\Lambda}_c^{+}$ → pη′ signal is observed for the first time with a signal significance of 5.4σ. The relative branching fraction with respect to the normalization mode ${\Lambda}_c^{+}$ → pK⁻π⁺ is measured to be

$$ \frac{\mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)}{\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)}=\left(7.54\pm 1.32\pm 0.73\right)\times {10}^{-3}, $$

where the uncertainties are statistical and systematic, respectively. Using the world-average value of $\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)$ = (6.28 ± 0.32) × 10⁻², we obtain

$$ \mathcal{B}\left({\Lambda}_c^{+}\to p\eta^{\prime}\right)=\left(4.73\pm 0.82\pm 0.46\pm 0.24\right)\times {10}^{-4}, $$

where the uncertainties are statistical, systematic, and from $\mathcal{B}\left({\Lambda}_c^{+}\to {pK}^{-}{\pi}^{+}\right)$, respectively.