Study of $π^{0}$ and $η$ decays containing dilepton

Details Study of $π^{0}$ and $η$ decays containing dilepton Study of $π^{0}$ and $η$ decays containing dilepton

2009-12-11

arxiv.org/abs/0912.2147v5

J.Phys.G38:065001,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 1 figures. 2 tables; Charge factors added and numerical results corrected

Scientific paper

10.1088/0954-3899/38/6/065001

We calculate the momentum dependent form factors of $P \to \gamma^* \gamma^*$($P=\pi^{0}, \eta$) within the light-front quark model. Using the form factors, we examine the decays of $P \to l^+ l^-$, $P \to l^+ l^- \gamma$ and $P \to l^+ l^- l^+ l^-$($l=e$ or $\mu$) and compare our results with the experimental data and other theoretical predictions. In particular, for $\pi^0 \to e^+e^-$, we find that the decay branching ratio is $6.68\times 10^{-8}$, which is consistent with the recent measurement of $(7.48\pm0.29\pm0.25)\times 10^{-8}$ by E799 of KTeV/Fermilab.

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