2017/07/31 by Belle Collaboration, B. Pal, A. J. Schwartz +164 · 1 citation
Chemistry · Mathematics · Physics and Astronomy · #Analytical Chemistry (journal) #Branching (polymer chemistry) #Branching fraction #Chemistry #Collider #Combinatorics #Electron–positron annihilation #High-Energy Particle Collisions Research #KEKB #Mathematics #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1103/physrevd.96.051102
published as Phys. Rev. D 96, 051102 (2017) · 8 pages, 5 figures, 1 table, minor text change in version 2
openalex publication_date 2017/09/22 · arxiv created 2017/09/25 · arxiv updated 2017/09/27 · openalex created_date 2017/10/06 · openalex updated_date 2026/08/06
We have searched for the Cabibbo-suppressed decay \mathrm\ensuremathΛc+\ensuremath→\ensuremathφp\ensuremathπ0 in e+e^\ensuremath- collisions using a data sample corresponding to an integrated luminosity of 915 fb^\ensuremath-1. The data were collected by the Belle experiment at the KEKB e+e^\ensuremath- asymmetric-energy collider running at or near the \mathrm\ensuremathΥ(4S) and \mathrm\ensuremathΥ(5S) resonances. No significant signal is observed, and we set an upper limit on the branching fraction of B(\mathrm\ensuremathΛc+\ensuremath→\ensuremathφp\ensuremathπ0)<15.3\ifmmode×\else\texttimes\fi10^\ensuremath-5 at 90% confidence level. The contribution of nonresonant \mathrm\ensuremathΛc+\ensuremath→K+K^\ensuremath-p\ensuremathπ0 decays is found to be consistent with zero, and the corresponding upper limit on its branching fraction is set to be B(\mathrm\ensuremathΛc+\ensuremath→K+K^\ensuremath-p\ensuremathπ0)NR<6.3\ifmmode×\else\texttimes\fi10^\ensuremath-5 at 90% confidence level. We also search for an intermediate hidden-strangeness pentaquark decay Ps+\ensuremath→\ensuremathφp. We see no evidence for this intermediate decay and set an upper limit on the product branching fraction of B(\mathrm\ensuremathΛc+\ensuremath→Ps+\ensuremathπ0)\ifmmode×\else\texttimes\fiB(Ps+\ensuremath→\ensuremathφp)<8.3\ifmmode×\else\texttimes\fi10^\ensuremath-5 at 90% confidence level. Finally, we measure the branching fraction for the Cabibbo-favored decay \mathrm\ensuremathΛc+\ensuremath→K^\ensuremath-\ensuremathπ+p\ensuremathπ0; the result is B(\mathrm\ensuremathΛc+\ensuremath→K^\ensuremath-\ensuremathπ+p\ensuremathπ0)=(4.42\ifmmode±\else\textpm\fi0.05(stat)\ifmmode±\else\textpm\fi0.12(syst)\ifmmode±\else\textpm\fi0.16(norm))%, which is the most precise measurement to date.