Super heavy dark matter origin of the PeV neutrino event: KM3-230213A
Kazunori Kohri, Partha Kumar Paul, Narendra Sahu
Abstract
The recent observation of the ultrahigh-energy neutrino event KM3-230213A by the KM3NeT experiment offers a compelling avenue to explore physics beyond the Standard Model (SM). In this paper, we explore a simplest possibility that this event originates from the decay of a super-heavy dark matter (SHDM). We consider a minimal scenario where the SHDM decays to neutrino and SM Higgs. We derive constraints on the DM lifetime as a function of DM mass, ensuring consistency with IceCube, Auger upper limits, and the observed KM3-230213A event, along with the gamma-ray constraints. We find that KM3-230213A gives stringent constraint on the DM mass ranging from <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mn>1.5</a:mn> <a:mo>×</a:mo> <a:msup> <a:mrow> <a:mn>10</a:mn> </a:mrow> <a:mrow> <a:mn>8</a:mn> </a:mrow> </a:msup> <a:mtext> </a:mtext> <a:mtext> </a:mtext> <a:mi>GeV</a:mi> </a:mrow> </a:math> to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>5.2</c:mn> <c:mo>×</c:mo> <c:msup> <c:mn>10</c:mn> <c:mn>9</c:mn> </c:msup> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:mi>GeV</c:mi> </c:math> with lifetime in the range: <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mn>1.42</e:mn> <e:mo>×</e:mo> <e:msup> <e:mn>10</e:mn> <e:mn>30</e:mn> </e:msup> <e:mtext> </e:mtext> <e:mtext> </e:mtext> <e:mi mathvariant="normal">s</e:mi> </e:math> to <h:math xmlns:h="http://www.w3.org/1998/Math/MathML" display="inline"> <h:mn>5.4</h:mn> <h:mo>×</h:mo> <h:msup> <h:mn>10</h:mn> <h:mn>29</h:mn> </h:msup> <h:mtext> </h:mtext> <h:mtext> </h:mtext> <h:mi mathvariant="normal">s</h:mi> </h:math> . Remarkably, in our SHDM scenario, the apparent tension between the KM3NeT observation and the nonobservation of this event by IceCube and Auger can be reduced to below <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"> <k:mn>1.2</k:mn> <k:mi>σ</k:mi> </k:math> . Our results are applicable to any neutrinophilic SHDM models while evading gamma-ray constraints.