2016/08/31 by BESIII collaboration, M. Ablikim, M. N. Achasov +440
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Branching fraction #Chemistry #Crystallography #Energy (signal processing) #Geometry #High-Energy Particle Collisions Research #Lambda #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Pi #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #hep-ex
paper · pdf · doi:10.1103/physrevlett.117.232002
published as Phys. Rev. Lett. 117, 232002 (2016)
openalex created_date 2016/08/23 · openalex publication_date 2016/12/02 · arxiv created 2017/11/15 · arxiv updated 2017/11/16 · openalex updated_date 2026/08/05
Using 567 pb^\ensuremath-1 of data collected with the BESIII detector at a center-of-mass energy of √(s)=4.599 GeV, near the \mathrm\ensuremathΛc+\mathrm\ensuremathΛc^\ensuremath- threshold, we study the singly Cabibbo-suppressed decays \mathrm\ensuremathΛc+\ensuremath→p\ensuremathπ+\ensuremathπ^\ensuremath- and \mathrm\ensuremathΛc+\ensuremath→pK+K^\ensuremath-. By normalizing with respect to the Cabibbo-favored decay \mathrm\ensuremathΛc+\ensuremath→pK^\ensuremath-\ensuremathπ+, we obtain ratios of branching fractions: [B(\mathrm\ensuremathΛc+\ensuremath→p\ensuremathπ+\ensuremathπ^\ensuremath-)/B(\mathrm\ensuremathΛc+\ensuremath→pK^\ensuremath-\ensuremathπ+)]=(6.70\ifmmode±\else\textpm\fi0.48\ifmmode±\else\textpm\fi0.25)%, [B(\mathrm\ensuremathΛc+\ensuremath→p\ensuremathφ)/B(\mathrm\ensuremathΛc+\ensuremath→pK^\ensuremath-\ensuremathπ+)]=(1.81\ifmmode±\else\textpm\fi0.33\ifmmode±\else\textpm\fi0.13)%, and [B(\mathrm\ensuremathΛc+\ensuremath→pK+K_non\ensuremath-\ensuremathφ^\ensuremath-)/B(\mathrm\ensuremathΛc+\ensuremath→pK^\ensuremath-\ensuremathπ+)]=\phantom\rule0ex0ex(9.36\ifmmode±\else\textpm\fi2.22\ifmmode±\else\textpm\fi0.71)\ifmmode×\else\texttimes\fi10^\ensuremath-3, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay \mathrm\ensuremathΛc+\ensuremath→p\ensuremathπ+\ensuremathπ^\ensuremath- is observed for the first time, and the precision of the branching fraction for \mathrm\ensuremathΛc+\ensuremath→pK+K_non\text\ensuremath-\ensuremathφ^\ensuremath- and \mathrm\ensuremathΛc+\ensuremath→p\ensuremathφ is significantly improved.