Theory Division

The importance of detecting neutrinos from a Milky Way core-collapse supernova is well known.  An under-studied phase is proto-neutron star cooling.  With the high statistics expected for present and near-future detectors, it should be possible to obtain detailed neutrino signals from before the start of the cooling phase to very late times.  We present the... More »

The first results from the Muon g-2 experiment at Fermilab will be unveiled and discussed in a special seminar to be held Wednesday, April 7, 2021, at 10:00 AM US Central Time. The Muon g-2 experiment searches for telltale signs of new particles and forces by examining the muon’s interaction with a surrounding magnetic field. By precisely determining the... More »

There is a surprising connection between the top quark and Higgs alignment in Gildener-Weinberg multi-Higgs-doublet models. Were it not for the top quark and its large mass, the coupling of the 125 GeV Higgs boson H to gauge bosons and fermions would be indistinguishable from those of the Standard Model Higgs. The top quark’s coupling... More »

The traditional method of performing renormalization group (RG) transformations for spin systems is by spin-blocking, where the block spins are local averages of the original spins, and they live on a lattice with fewer sites than the original lattice. As such, this transformation is inherently discrete. By contrast, over the last decade a new technique known as... More »

Even though the LHC searches did not unveil the new physics particles so far, observations made at LHCb and the B-factories point towards lepton flavor universality violation in both tree-level and loop-induced B-meson semileptonic decays. After a review of the status of these anomalies, I will discuss general implications that can be derived by using... More »

Theoretical understandings of the neutrino-nucleus cross sections are critical for constraining neutrino parameters in future neutrino oscillation experiments such as DUNE and Hyper-K. For neutrino energies at around 1 GeV, uncertainties in the nucleon axial form factor, which parameterizes the weak response of a neutron or proton as a function of the four momentum transfer,... More »

The Muon g-2 collaboration at Fermilab has recently announced its first results for measurement of the muon magnetic anomaly aμ based on its 2018 Run-1 dataset. The measurement requires measurement of two frequencies, whose ratio forms the key input to the anomaly determination. The magnetic field strength measured in terms of the precession frequency of... More »