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The branching ratios of K^- absorption at rest in nuclear matter aretheoretically investigated in order to understand the mechanism of K^-absorption into nuclei. For this purpose mesonic and nonmesonic absorptionpotentials are evaluated as functions of nuclear density, the kaon momentum andenergy from one- and two-body K^- self-energy, respectively. By using a chiralunitary approach for the s-wave Kbar N amplitude we find that both the mesonicand nonmesonic absorption potentials are dominated by the Lambda(1405)contributions. The fraction of the mesonic and nonmesonic absorptions areevaluated to be respectively about 70% and 30% at the saturation density almostindependently on the kaon momentum. We also observe different behavior of thebranching ratios to pi ^+ Sigma^- and pi^- Sigma^+ channels in mesonicabsorption due to the interference between Lambda(1405) and the I=1 nonresonantbackground, which is consistent with experimental results. The nonmesonicabsorption ratios [Lambda p]/[Sigma^0 p] and [Lambda n]/[Sigma^0 n] are aboutunity while [Sigma^+ n]/[Sigma^0 p] and [Sigma^- p]/[Sigma^0 n] are about twodue to the Lambda(1405) dominance in absorption. Taking into account the kaonmomenta and energies, the absorption potentials become weaker due to thedownward shift of the initial K^-N two-body energy, but this does notdrastirally change the nonmesonic fraction. The Sigma(1385) contribution in thep-wave Kbar N amplitude is examined and found to be very small compared to theLambda(1405) contribution in slow K^- absorption.

Branching ratios of mesonic and nonmesonic antikaon absorptions in nuclear medium