Space- and time-like form factors for $ω\toπγ^*$ and $K^*\to Kγ^*$ in light-front quark model

Details Space- and time-like form factors for $ω\toπγ^*$ and $K^*\to Kγ^*$ in light-front quark model Space- and time-like form factors for $ω\toπγ^*$ and $K^*\to Kγ^*$ in light-front quark model

2008-03-21

arxiv.org/abs/0803.3100v1

Phys.Rev.D77:097301,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

4pages, 4figures

Scientific paper

10.1103/PhysRevD.77.097301

We investigate space- and time-like form factors for $\omega\to\pi\gamma^*$ and $K^*\to K\gamma^*$ decays using the light-front quark model constrained by the variational principle for the QCD-motivated effective Hamiltonian. The momentum dependent space-like form factors are obtained in the $q^+=0$ frame and then analytically continued to the time-like region. Our prediction for the time-like form factor $F_{\omega\pi}(q^2)$ is in good agreement with the experimental data. We also find that the space-like form factor $F_{K^{*\pm}K^{\pm}}(Q^2)$ for charged kaons encounters a zero because of the negative interference between the two currents to the quark and the antiquark.

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