Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-01-13
Phys.Lett. B326 (1994) 14-20
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages and 2 figures(LaTeX), SNUTP-93-81. (References are added in the reference [21])
Scientific paper
10.1016/0370-2693(94)91185-1
The s-wave $K^{\pm}N$ scattering amplitude is computed up to one-loop order corresponding to next-to-next-to-leading order (or N$^2$LO in short) with a heavy-baryon effective chiral Lagrangian. Constraining the low-energy constants by on-shell scattering lengths, we obtain contributions of each chiral order up to N$^2$LO and find that the chiral corrections are ``natural" in the sense of viable effective field theories. We have also calculated off-shell $s$-wave $K^-N$ scattering amplitudes relevant to kaonic atoms and $K^-$ condensation in ``nuclear star" matter including the effect of $\Lambda (1405)$. The $K^-p$ amplitude is found to be quite sensitive to the intermediate $\Lambda (1405)$ contribution, while the $K^-n$ amplitude varies smoothly with the C.M. energy. The crossing-even one-loop corrections are found to play an important role in determining the higher-order chiral corrections.
Jung Hong
Lee Chang-Hwan
Min Dong-Pil
Rho Mannque
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