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Implications on Inelastic Dark Matter from 100 Live Days of XENON100 Data

XENON100 Collaboration, E. Aprile, K. Arisaka, F. Arneodo, A. Askin, L. Baudis, A. Behrens, K. Bokeloh, E. Brown, T. Bruch, G. Bruno, J. M. R. Cardoso, W. -T. Chen, B. Choi, D. Cline, E. Duchovni, S. Fattori, A. D. Ferella, F. Gao, K. -L. Giboni, E. Gross, A. Kish, C. W. Lam, J. Lamblin, R. F. Lang, C. Levy, K. E. Lim, Q. Lin, S. Lindemann, M. Lindner, J. A. M. Lopes, K. Lung, T. Marrodán Undagoitia, Y. Mei, A. J. Melgarejo Fernandez, K. Ni, U. Oberlack, S. E. A. Orrigo, E. Pantic, R. Persiani, G. Plante, A. C. C. Ribeiro, R. Santorelli, J. M. F. dos Santos, G. Sartorelli, M. Schumann, M. Selvi, P. Shagin, H. Simgen, A. Teymourian, D. Thers, O. Vitells, H. Wang, M. Weber, C. Weinheimer

Abstract

The XENON100 experiment has recently completed a dark matter run with 100.9 live-days of data, taken from January to June 2010. Events in a 48kg fiducial volume in the energy range between 8.4 and 44.6 keVnr have been analyzed. A total of three events have been found in the predefined signal region, compatible with the background prediction of (1.8 \pm 0.6) events. Based on this analysis we present limits on the WIMP-nucleon cross section for inelastic dark matter. With the present data we are able to rule out the explanation for the observed DAMA/LIBRA modulation as being due to inelastic dark matter scattering off iodine at a 90% confidence level.

Implications on Inelastic Dark Matter from 100 Live Days of XENON100 Data

Abstract

The XENON100 experiment has recently completed a dark matter run with 100.9 live-days of data, taken from January to June 2010. Events in a 48kg fiducial volume in the energy range between 8.4 and 44.6 keVnr have been analyzed. A total of three events have been found in the predefined signal region, compatible with the background prediction of (1.8 \pm 0.6) events. Based on this analysis we present limits on the WIMP-nucleon cross section for inelastic dark matter. With the present data we are able to rule out the explanation for the observed DAMA/LIBRA modulation as being due to inelastic dark matter scattering off iodine at a 90% confidence level.

Paper Structure

This paper contains 2 equations, 3 figures.

Figures (3)

  • Figure 1: Expected iDM nuclear recoil spectrum in XENON100 for 100.9 live days measured between January and June for a WIMP with $M_\chi=50~\mathrm{GeV}$, $\delta=110\,\mathrm{keV}$ (black, solid); $M_\chi=55~\mathrm{GeV}$, $\delta=115\,\mathrm{keV}$ (blue, dotted), and $M_\chi=60~\mathrm{GeV}$, $\delta=120\,\mathrm{keV}$ (green, dashed) and a $\sigma$ corresponding to the lower 90% confidence limit of the DAMA/LIBRA signal. The XENON100 observed spectrum is shown in red. Vertical dotted lines show the analysis energy interval.
  • Figure 2: DAMA/LIBRA 90% confidence level signal region for $\delta=120~\mathrm{keV}$ (gray region). Superimposed are the 90% confidence level exclusion curves for XENON100 (black, solid), CDMS Ahmed:2009zw (red, dashed) and ZEPLIN-III akimov2010 (blue, dash-dotted). The whole DAMA/LIBRA WIMP region is excluded by XENON100.
  • Figure 3: Parameter space to explain the DAMA/LIBRA annual modulation with iDM (light blue area), and parameter space excluded by the CDMS-II Ahmed:2009zw experiment (blue horizontal lines), the ZEPLIN-III akimov2010 experiment (green descending lines). XENON100 (red ascending lines) excludes the whole allowed DAMA/LIBRA region. The orange region corresponds to the parameter space which is not accessible to any xenon experiment. $v_0=220\,\mathrm{km/s}$ and $v_{esc}=544\,\mathrm{km/s}$ have been assumed.