First measurement of the Lambda(+)(c) -> p eta ' decay

TR Number
2022-03-15, 2022-03-15
Journal Title
Journal ISSN
Volume Title

We present the first measurement of the branching fraction of the singly Cabibbo-suppressed (SCS) decay Λc+→ 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 Λc+→ 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 Λc+→ pK−π+ is measured to beB(Λc+→pη′)B(Λc+→pK−π+)=(7.54±1.32±0.73)×10−3, where the uncertainties are statistical and systematic, respectively. Using the world-average value of B(Λc+→pK−π+) = (6.28 ± 0.32) × 10−2, we obtainB(Λc+→pη′)=(4.73±0.82±0.46±0.24)×10−4, where the uncertainties are statistical, systematic, and from B(Λc+→pK−π+), respectively. [Figure not available: see fulltext.]

Science & Technology, Physical Sciences, Physics, Particles & Fields, Physics, Branching fraction, e(+)-e(-) Experiments, Charm Physics, Particle and Resonance Production, NONLEPTONIC DECAYS, FRAGMENTATION, QUARK, MODEL, 4902 Mathematical Physics, 5107 Particle and High Energy Physics, 49 Mathematical Sciences, 51 Physical Sciences, 5106 Nuclear and plasma physics