2016/12/20 by Ze Zhao, Dan-Dan Ye, Dandan Ye +1 · 1 citation
Physics and Astronomy · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #High-Energy Particle Collisions Research
paper · doi:10.1103/physrevd.94.114020
The hadronic decay widths and some ratios of branching fractions of the newly observed charmed strange baryons, \mathrm\ensuremathΞc(3055)0, \mathrm\ensuremathΞc(3055)+, and \mathrm\ensuremathΞc(3080)+ are calculated in a 3P0 model. In the calculation, they are considered as 34 kinds of D-wave charmed strange baryons. Among these assignments, \mathrm\ensuremathΞc(3055)+ is very possibly a JP=(5)/(2)+ \stackrel^\mathrm\ensuremathΞc3^\ensuremath'((5)/(2)+) or \stackrel\textasciicaron\mathrm\ensuremathΞc32((5)/(2)+). In these two assignments, \mathrm\ensuremathΞc(3055)+ has the total decay width \mathrm\ensuremathΓ=10.1 MeV and \mathrm\ensuremathΓ=7.6 MeV, respectively. The predicted ratios \mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)+\ensuremath→\mathrm\ensuremathΛD+)/\mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)+\ensuremath→\mathrm\ensuremathΣc++K^\ensuremath-)=3.39. \mathrm\ensuremathΞc(3055)+ is also very possibly a JP=(7)/(2)+ \stackrel^\mathrm\ensuremathΞc3^\ensuremath'((7)/(2)+) or \stackrel\textasciicaron\mathrm\ensuremathΞc32((7)/(2)+). In these two assignments, \mathrm\ensuremathΞc(3055)+ has the total decay width \mathrm\ensuremathΓ=9.7 MeV and \mathrm\ensuremathΓ=6.3 MeV, respectively. The predicted ratios \mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)+\ensuremath→\mathrm\ensuremathΛD+)/\mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)+\ensuremath→\mathrm\ensuremathΣc++K^\ensuremath-)=5.91 or 6.04. As an isospin partner of \mathrm\ensuremathΞc(3055)+, \mathrm\ensuremathΞc(3055)0 is also very possibly a JP=(5)/(2)+ \stackrel^\mathrm\ensuremathΞc3^\ensuremath'((5)/(2)+) or \stackrel\textasciicaron\mathrm\ensuremathΞc32((5)/(2)+). In these assignments, \mathrm\ensuremathΞc(3055)0 has the total decay width \mathrm\ensuremathΓ=10.9 MeV and \mathrm\ensuremathΓ=7.0 MeV. The predicted ratios \mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)0\ensuremath→\mathrm\ensuremathΛD0)/\mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)0\ensuremath→\mathrm\ensuremathΣc+K^\ensuremath-)=4.24 or 4.20. \mathrm\ensuremathΞc(3055)0 is also very possibly a JP=(7)/(2)+ \stackrel^\mathrm\ensuremathΞc3^\ensuremath'((7)/(2)+) or \stackrel\textasciicaron\mathrm\ensuremathΞc32((7)/(2)+). In these assignments, \mathrm\ensuremathΞc(3055)0 has the total decay width \mathrm\ensuremathΓ=10.3 MeV and \mathrm\ensuremathΓ=7.1 MeV. The predicted ratios \mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)0\ensuremath→\mathrm\ensuremathΛD0)/\mathrm\ensuremathΓ(\mathrm\ensuremathΞc(3055)0\ensuremath→\mathrm\ensuremathΣc+K^\ensuremath-)=7.47 or 7.56. The results agree well with recent experimental data from Belle. \mathrm\ensuremathΞc(3080)+ seems impossible to identify with a D-wave charmed strange baryon.