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Recent searches for solar axions and large extra dimensions

We analyze the data from two recent experiments designed to search for solar within the context of multidimensional theories of the Kaluza-Klein type. In these experiments, axions were supposed to be emitted from the solar core in M1 transitions between the first excited state and the ground state if 57-Fe and 7-Li. Because of the high multiplicity of axionic Kaluza-Klein states which couple with the strength of ordinary QCD axions, we obtain much more stringent experimental limits on the four dimensional Peccei-Quinn breaking scale f_pQ+ compared with the solar QCD axion limit. Specifically, for the 57-Fe experiment, f_PQ>1 x 10^6 GeV in theories with two extra dimensions and a higher-dimensional gravitational scale M_H of order 1 TeV (to be compared with the QCD axion limit, f_PQ > 8x10^3 GeV). For the 7-Li experiment, f_PQ>1.4x10^5 GeV and 3.4x10^5 GeV, respectively (to be compared with the QCD axion limit, f_PQ>1.9x10^2 GeV). It is an interesting feature of our results, that in most cases, the obtained limit on f_PQ cannot be coupled with the mass of the axion, which is essentially set by the (common) radius of the extra dimensions.

large extra dimensions; solar axions

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