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Motivated by evidence for the existence of dark matter, many new physics models predict the pair production of new particles, followed by the decays into two invisible particles, leading to a momentum imbalance in the visible system. For the cases where all four components of the vector sum of the two `missing momenta are measured from the momentum imbalance, we present analytic solutions of the final state system in terms of measureable momenta, with the mass shell constraints taken into account. We then introduce new variables which allow the masses involved in the new physics process, including that of the dark matter particles, to be extracted. These are compared with a selection of variables in the literature, and possible applications at lepton and hadron colliders are discussed.
Dark photons are hypothetical massive vector particles that could mix with ordinary photons. The simplest theoretical model is fully characterised by only two parameters: the mass of the dark photon m$_{gamma^{mathrm{D}}}$ and its mixing parameter wi
A new imaging technique for $alpha$-particles using a fast optical camera focused on a thin scintillator is presented. As $alpha$-particles interact in a thin layer of LYSO fast scintillator, they produce a localized flash of light. The light is coll
The gravitational force on antimatter has never been directly measured. A method is suggested for measuring the acceleration of antimatter $(bar g)$ by measuring the deflection of a beam of neutral antihydrogen atoms in the Earths gravitational field
In this paper, we point out a novel signature of physics beyond the Standard Model which could potentially be observed both at the Large Hadron Collider (LHC) and at future colliders. This signature, which emerges naturally within many proposed exten
(abbreviated) In this note we consider, in a weak-field limit, a relativistic linear motion of two particles with opposite signs of masses having a small difference between their absolute values $m_{1,2}=pm (mupm Delta mu) $, $mu > 0$, $|Delta mu | l