Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-08-21
Phys.Lett.B676:88,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 5 figures. Title changed, pi-A mixing included. Version to appear in PLB
Scientific paper
10.1016/j.physletb.2009.04.081
We constrain the light CP-odd Higgs $A_{1}^{0}$ in NMSSM via the rare decay $\pi^{0}\to e^{+}e^{-}$. It is shown that the possible $3\sigma$ discrepancy between theoretical predictions and the recent KTeV measurement of ${\cal B}({\pi}^{0}\to e^+ e^-)$ cannot be resolved when the constraints from $\Upsilon\to\gamma A_1^0$, $a_{\mu}$ and $\pi^{0}\to \gamma \gamma$ are combined. Furthermore, the combined constraints also exclude the scenario involving $m_{A_1^0}=214.3$ MeV, which is invoked to explain the anomaly in the $\Sigma^{+}\to p \mu^{+}\mu^{-}$ decay found by the HyperCP Collaboration.
Chang Qin
Yang Ya-Dong
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