Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-08-26
Phys.Rev.D80:115017,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 2 figures; v2: added reference, fixed typos, small changes in wording
Scientific paper
10.1103/PhysRevD.80.115017
The possibility of direct detection of light fermionic dark matter in neutrino detectors is explored from a model-independent standpoint. We consider all operators of dimension six or lower which can contribute to the interaction $\bar{f} p \to e^+ n$, where $f$ is a dark Majorana or Dirac fermion. Constraints on these operators are then obtained from the $f$ lifetime and its decays which produce visible $\gamma$ rays or electrons. We find one operator which would allow $\bar{f} p \to e^+ n$ at interesting rates in neutrino detectors, as long as $m_f \lesssim m_{\pi}$. The existing constraints on light dark matter from relic density arguments, supernova cooling rates, and big-bang nucleosynthesis are then reviewed. We calculate the cross-section for $\bar{f} p \to e^+ n$ in neutrino detectors implied by this operator, and find that Super-K can probe the new physics scale $\Lambda$ for this interaction up to ${\cal O}(100 {TeV})$
Kile Jennifer
Soni Amarjit
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