Abstract
The current status of searches for ultra-high energy neutrinos and photons using air showers is reviewed. Regarding both physics and observational aspects, possible future research directions are indicated.
Highlights
What is the status of searches for ultra-high energy neutrinos and photons using air showers? What might be the future prospects, in particular in the couple of years? What is the physics case(s) for multimessenger observations, and what are the observational experiences and challenges? These questions may summarize the main objective of the Multimessenger Working Group that was formed, together with four other Working Groups, a few months before the UHECR-2012 symposium
Both UHE neutrinos and photons are thought to be typically produced as decay secondaries, i.e. they come from higher-energy cosmic rays
Top-down models were proposed where the pions can emerge from the decay or annihilation of exotic particles; as will be commented on below, these models are strongly constrained by searches for UHE photons and neutrinos. Both messengers can emerge from the same type of initial process, and from decay. Both UHE neutrinos and photons propagate along a straight line and are not deflected by magnetic fields, in contrast to charged cosmic rays
Summary
These questions may summarize the main objective of the Multimessenger Working Group that was formed, together with four other Working Groups, a few months before the UHECR-2012 symposium At this symposium, possible future directions of the field of ultra-high energy cosmic rays were discussed, bringing the major collaborations from air-shower experiments as well as colleagues from theory together. One can compare neutrinos versus photons; neutrinos and photons versus charged cosmic rays; air shower observations versus other techniques; shower observations from ground versus those from space; ground shower techniques versus each other; current data versus models; various models versus each other; and, above all, the present status versus future directions Given these many aspects in a highly dynamic field, it is evident this review does not claim to be complete, or even finished. We start with both neutrinos and photons before each one is examined individually
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