Analysis of $K^+ \to e^+ ν_{e}γ$ in light-front quark model and chiral perturbation theory of order $p^6$

Details Analysis of $K^+ \to e^+ ν_{e}γ$ in light-front quark model and chiral perturbation theory of order $p^6$ Analysis of $K^+ \to e^+ ν_{e}γ$ in light-front quark model and chiral perturbation theory of order $p^6$

2007-10-16

arxiv.org/abs/0710.2971v2

Phys.Rev.D77:014004,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures, final version to be published in PRD

Scientific paper

10.1103/PhysRevD.77.014004

Within the frameworks of the light-front quark model (LFQM) and chiral perturbation theory (ChPT) of $O(p^6)$, we reevaluate the form factors of the $K^+ \to \gamma$ transition. We use these form factors to study the decay of $K^+ \to e^+ \nu_{e}\gamma$, which is dominated by the structure dependent contribution. We show the differential decay branching ratio as a function of $x=2E_\gamma/m_K$, where $E_\gamma$ ($m_K$) is the photon energy (kaon mass). Explicitly, we find that, in the standard model with the cut of $x=0.01$ (0.1), the decay branching ratio of $K^+ \to e^+ \nu_{e}\gamma$ is $1.54 (1.44)\times 10^{-5}$ and $1.57 (1.47)\times 10^{-5}$ in the LFQM and ChPT, respectively.

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