Boosting Stop Searches with a 100 TeV Proton Collider

A proton-proton collider with center of mass energy around 100 TeV is the energy frontier machine that is likely to succeed the LHC. One of the primary physics goals will be the continued exploration of weak scale naturalness. Here we focus on the pair-production of stops that decay to a top and a neutralino. Most of the heavy stop parameter space results in highly boosted tops, populating kinematic regimes inaccessible at the LHC. New strategies for boosted top-tagging are needed and a simple, detector-independent tagger can be constructed by requiring a muon inside a jet. Assuming 20% systematic uncertainties, this future collider can discover (exclude) stops with masses up to 6.5 (8) TeV with 3000 fb^-1 of integrated luminosity. Studying how the exclusion limits scale with luminosity motivates going beyond this benchmark in order to saturate the discovery potential of the machine.Comment: v2: 16 pages, 17 figures, results updated using NLL+NLO cross sections, journal versio

Inaudibility criteria and alternative methods for controlling music noise levels from late night entertainment

The methods and criteria for controlling music noise levels from late night entertainment has always been a controversial and highly debated topic. Since the early 1980s a subjective criterion of inaudibility has been commonly used in many parts of the UK. It has faced fierce criticism in many respects, such as in legal proceedings where it has been argued to not be compliant with the Licensing Act 2003. However, as no mainstream alternative has been adopted, the requirement for inaudibility continues to be used in many premises’ licences that are either for fixed or temporary sites, and for both indoor and outdoor events. This paper aims to evaluate recently proposed alternative methods and to start an open discussion on the topic of music and entertainment noise levels, particularly during late-night hours

Backscatter and spontaneous four-wave mixing in micro-ring resonators

We model backscatter for electric fields propagating through optical micro-ring resonators, as occurring both in-ring and in-coupler. These provide useful tools for modelling transmission and in-ring fields in these optical devices. We then discuss spontaneous four-wave mixing and use the models to obtain heralding efficiencies and rates. We observe a trade-off between these, which becomes more extreme as the rings become more strongly backscattered.Comment: 8 pages, 8 figures - matches version published in J. Phys. Photonic