arXiv subjects

I. J. Hsu

Publications and source records attributed to I. J. Hsu.

3 recordsLinked to original sources

arXiv1996

Study of Long Distance Contributions to $K\to nπν\barν$

We calculate long distance contributions to $K\toπν\barν\,,\ ππν\barν$, and $πππν\barν$ modes within the framework of chiral perturbation theory. We find that these contributions to decay rates of $K\to πν\barν$ and $K\to ππν\barν$ in the chiral logarithmic approximation are at least seven orders of magnitude suppressed relative to those from the short distance parts. The long distance effects in this class of decays are therefore negligible.

hep-ph↗

arXiv1995

Comments on long distance contribution to $K^+\toπ^+ν\barν$

We study the long distance contribution to $K^+\toπ^+ν\bar{ν$ by using chiral perturbation theory. We find that the tree level $O(P^2)$ contribution vanishes identically without assuming the large $N_c$ limit. The leading contribution arises from the one-loop amplitude, which is $O(P^4)$ in the chiral power counting. The branching ratio of the long distance contribution is found to be of order $10^{-7}$ smaller compared with that of short distance one and hence is completely negligible.

hep-ph↗

arXiv1994

CP Conserving and Violating Contributions to $K_L\toπ^+π^-ν\barν$

We study both CP conserving and violating contributions to the decay $K_L\toπ^+π^-ν\barν$. We find that the decay branching ratio is dominated by the CP conserving part. In the standard CKM model, we estimate that for $m_t\sim 174\ GeV$, the branching ratio due to the CP conserving (violating) contributions can be as large as $4.4 \times 10^{-13}$ ($1.0\times 10^{-14}$).

hep-ph↗