1207.1661 (M. Bayar et al.)

$\bar{K}NN$ Absorption within the Framework of the Fixed Center
Approximation to Faddeev equations    [PDF]

M. Bayar, E. Oset

We present a method to evaluate the $\bar{K}$ absorption width in the bound $\bar{K}NN$ system. Most calculations of this system ignore this channel and only consider the $\bar{K}N \rightarrow \pi \Sigma$ conversion. Other works make a qualitative calculation using perturbative methods. Since the $ \Lambda(1405) $ resonance is playing a role in the process, the same resonance is changed by the presence of the absorption channels and we find that a full nonperturbative calculation is demanded, which we present here. We employ the Fixed Center Approximation to Faddeev equations to account for $\bar{K}$ rescattering on the $ (NN) $ cluster and we find that the width of the states found previously for $ S=0 $ and $ S=1 $ increases by about 30 MeV due to the $\bar{K}NN$ absorption, to a total width of about 80 MeV.

View original: http://arxiv.org/abs/1207.1661