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The experimental consequences of different order parameters in iron-basedsuperconductors are theoretically analyzed. We consider both nodeless and nodalorder parameters, with an emphasis on the $\cos(k_x)\cdot \cos(k_y)$ nodelessorder parameter recently derived by two of us. We analyze the effect of thisorder parameter on the spectral function, density of states, tunnelingdifferential conductance, penetration depth, and the NMR spin relaxation time.This extended s-wave symmetry has line-zeroes in between the electron and holepockets, but they do not intersect the two Fermi surfaces for moderate doping,and the superconductor is fully gapped. However, this suggests severalquantitative tests: the exponential decay of the penetration depth weakens andthe density of states reveals a smaller gap upon electron or hole doping.Moreover, the $\cos(k_x) \cdot \cos(k_y)$ superconducting gap is largest on thesmallest (hole) Fermi surface. For the $1/T_1$ NMR spin relaxation rate, theinter-band contribution is consistent with the current experimental results,including a (non-universal) $T^{3}$ behavior and the absence of a coherencepeak. However, the intra-band contribution is considerably larger than theinter-band contributions and still exhibits a small enhancement in the NMR spinrelaxation rate right below $T_c$ in the clean limit.

Experimental Consequences of the S-wave $\cos(k_x) \cdot \cos(k_y)$ Superconductivity in the Iron-Pnictides