The discovery of neutrino oscillations requires an extension of the Standard Model that generates neutrino masses and mixing. One of the simplest possibility is the addition of right-handed neutrinos which are fermionic gauge singlets. Low-scale realisations of this idea have a very rich phenomenology and their experimental signatures can be strikingly different depending on the masses of the right-handed neutrinos. … Read More
Motivated by the possible existence of other universes as part of the multiverse framework, we investigate how changing the fundamental constants of nature can change the prospects for the existence of astrophysical structures. This talk will focus on nucleosynthesis by considering simple models for nuclear structure. These modifications are then used to estimate the corresponding changes in binding energies and … Read More
Abstract: With the discovery of the Higgs boson, the LHC has entered an era of precision Higgs physics. The precision determination of the properties of the Higgs boson provides an excellent window into potential new physics. High precision predictions for Higgs boson observables are therefore essential for the future LHC Higgs physics program. This requires highly accurate predictions for differential … Read More
Abstract: We show that new tools from the formal study of scattering amplitudes can be applied to two-loop QCD corrections at the LHC, required to reduce the theoretical uncertainties in the cross sections to a few percent. The key lessons are complex momenta and hidden symmetries. The method of numerical unitarity overcomes the worse-than-factorial growth of the number of Feynman … Read More
abstract： Cosmic-ray anti-deuterium and anti-helium have long been suggested as probes of dark matter, as their secondary astrophysical production was thought extremely scarce. But how does one actually predict the secondary flux? Anti-nuclei are dominantly produced in pp collisions, where laboratory cross section data is lacking. We make a new attempt at tackling this problem by appealing to a scaling … Read More
Abstract: I will discuss a class of models in which thermal dark matter is lighter than an MeV. If dark matter thermalizes with the Standard Model below the temperature of neutrino-photon decoupling, constraints from measurements of the effective number of neutrino species are alleviated. This framework motivates new experiments in the direct search for sub-MeV thermal dark matter and light … Read More
Title: Cosmology and Signals of Strongly Interacting Dark Sectors Abstract: Standard Model particles account for a small fraction of the matter content of the universe. If the remaining dark matter (DM) was ever in thermal equilibrium with itself or with the Standard Model (SM) sector, there must exist interactions that allowed its number density to be depleted to its present … Read More
Abstract: Supernova 1987A created an environment of extremely high temperatures and nucleon densities. The rough agreement between predictions of core collapse models and observations of a “neutrino burst” provide an opportunity to set bounds on a wide range of theories of new physics. I’ll present new bounds on dark sector models, incorporating finite-temperature effects on the production and trapping of … Read More
Abstract: Although weakly interacting massive particles (WIMPs) have long been the leading class of candidates for the dark matter of our universe, the lack of a confirmed detection of these particles has left the community increasingly skeptical of their existence. In this talk, I will ask the following questions: How surprised should we be that WIMPs have not yet been … Read More
Abstract: We are entering a new era of neutrino astronomy with the recent IceCube discovery of high-energy astrophysical neutrinos. Important questions, such as what their sources are, arise with these events. The flavor composition of these neutrinos has been identified as a rich observable, containing information about the production processes and neutrino properties. So far, only $\nu_\mu$ charged current interactions … Read More