XENON10/100 dark matter constraints in comparison with CoGeNT and DAMA: Examining the L eff dependence
We consider the compatibility of DAMA/LIBRA, CoGeNT, XENON10 and XENON100 results for spin-independent (SI) dark matter weakly interacting massive particles, particularly at low masses ({approx}10 GeV), assuming a standard dark matter halo. The XENON bounds depend on the scintillation efficiency factor L{sub eff} for which there is considerable uncertainty. Thus we consider various extrapolations for L{sub eff} at low energy. With the L{sub eff} measurements we consider, XENON100 results are found to be insensitive to the low-energy extrapolation. We find the strongest bounds are from XENON10, rather than XENON100, due to the lower energy threshold. For reasonable choices of L{sub eff} and for the case of SI elastic scattering, XENON10 is incompatible with the DAMA/LIBRA 3{sigma} region and severely constrains the 7-12 GeV WIMP mass region of interest published by the CoGeNT Collaboration.