Abstract
A wealth of new physics models which are motivated by questions such as the nature of dark matter, the origin of the neutrino masses and the baryon asymmetry in the universe, predict the existence of hidden sectors featuring new particles. Among the possibilities are heavy neutral leptons, vectors and scalars, that feebly interact with the Standard Model (SM) sector and are typically light and long lived. Such new states could be produced in high-intensity facilities, the so-called beam dump experiments, either directly in the hard interaction or as a decay product of heavier mesons. They could then decay back to the SM or to hidden sector particles, giving rise to peculiar decay or interaction signatures in a far-placed detector. Simulating such kind of events presents a challenge, as not only short-distance new physics (hard production, hadron decays, and interaction with the detector) and usual SM phenomena need to be described but also the geometry of the detector has to be taken into account for a reliable estimate of the event yield and distributions. In this work, we describe a new plugin to the MadGraph5_aMC@NLO platform, which allows the complete simulation of new physics processes relevant for beam dump experiments, including the various mechanisms for the production of hidden particles, namely their decays or scattering off SM particles, as well as their far detection, keeping into account spatial correlations and the geometry of the experiment.
Highlights
Others, more ambitious, providing solutions to two or more open questions at the same time
We describe a new plugin to the MadGraph5 aMC@NLO platform, which allows the complete simulation of new physics processes relevant for beam dump experiments, including the various mechanisms for the production of hidden particles, namely their decays or scattering off Standard Model (SM) particles, as well as their far detection, keeping into account spatial correlations and the geometry of the experiment
In this paper we have presented a new MG5aMC plugin called MadDump that allows for the generation of events where the production of a particle and its detection are separated by a long distance
Summary
The first important aspect of our implementation is the idea of considering the beam dump experiment as a two-step process:. Detection: interaction of the hidden particles (or their decay products) in the (possibly far-placed) detector While both steps depend on the details of the new physics model and they have to be considered together, it is possible to factorise the simulation into two independent steps: the results of the Production phase simulation are used to build a (two-dimensional) parametrisation of the incoming hidden particle flux hitting the detector and leading to different signatures in the detector. The new physics short-distance part by definition depends on the details of the model and has to be generated/considered for each different data interpretation It can be described quite from first principles and dealt with by usual or especially developed MG5aMC modules
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