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Dr Yang Ma (INFN Bologna)29/04/2023, 10:00
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Prudhvi Bhattiprolu (University of Michigan)29/04/2023, 10:30
Vectorlike leptons are an intriguing possibility for physics beyond the Standard Model. This talk is concerned with the example of weak isosinglet vectorlike leptons that decay through a small mixing with the tau lepton, for which the discovery and exclusion reach of the Large Hadron Collider and future proposed hadron colliders is limited. For this minimal model, I will argue that an $e^+...
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Tom Steudtner29/04/2023, 10:45
This talk addresses the notorious metastability of the Standard Model and promotes it to a model building task. We explore the ingredients required to stabilize the SM up to the Planck scale without encountering sub-Planckian Landau poles. Using the SM extended by vectorlike fermions, we chart out the corresponding landscape of Higgs stability. We find that the "gauge portal mechanism",...
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Evan Petrosky29/04/2023, 11:00
The dark photon is a well-motivated and well-studied extension to the Standard Model. The strongest bounds on a dark photon with a mass near the Z pole come from precision electroweak analysis while for higher masses, collider bounds dominate. Existing tensions involving the heavy flavor observables, the W boson mass, and the muon magnetic moment motivate a revisiting of the precision...
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Joachim Brod (University of Cincinnati)29/04/2023, 11:35
Kaon physics observables are among our most sensitive indirect probes of high-energy dynamics. I review recent progress in kaon physics, with a focus on CP violation and rare decays.
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Roberto Bruschini29/04/2023, 12:05
Quantum ChromoDynamics (QCD) is universally accepted as the theory of strong interactions. However, because of the nonperturbative nature of QCD at low energies, calculating the hadron spectrum from the fundamental theory is a daunting task. In this talk, I focus on mesons containing a pair of heavy quarks. This is particularly interesting because some of these mesons, like the famous X(3872),...
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Maria Stefaniak29/04/2023, 12:20
A coherent description of nuclear matter properties at low and high baryon densities is of utmost importance. The limited number of experimental references at the region of the phase diagram corresponding to Neutron Stars (NS) and NS mergers poses major challenges for constructing a universal Equation of State (EoS). In order to constrain the EoS from heavy-ion collisions, experimental...
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Emmanuel Fonseca (West Virginia University)29/04/2023, 14:00
Pulsars are rotating neutron stars that emit beamed emission observed as periodic pulses on Earth. The practice of "pulsar timing" yields a wealth of uniquely powerful measurements across different astrophysical phenomena. Among these is the gradual detection of a stochastic background of gravitational waves (GWs) using a collection of pulsars rotating with millisecond spin periods. In my...
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Xucheng Gan29/04/2023, 14:30
The portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, we construct the scalar-controlled kinetic mixing varying with the ultralight CP-even scalar's cosmological evolution. To realize this and...
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Jan Schütte-Engel29/04/2023, 14:45
The thermal plasma in the early universe produced a guaranteed stochastic gravitational wave (GW) background, which peaks today in the microwave regime and was dubbed the cosmic gravitational microwave background (CGMB). We show that the CGMB spectrum encodes fundamental information about particle physics and gravity at ultra high energies. In particular, one can determine from the CGMB...
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Tony Menzo29/04/2023, 15:00
We introduce a novel, testable low scale baryogenesis scenario involving the CP violating decays of sterile neutrinos. In contrast to the conventional leptogenesis mechanisms we transfer the produced lepton asymmetry into a baryon asymmetry via scatterings with dark matter particles which conserve total baryon and lepton number but violate visible baryon number. We show that the mechanism...
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Keping Xie (University of Pittsburgh)29/04/2023, 15:15
We present a state-of-the-art prediction for cross sections of neutrino deeply inelastic scattering (DIS) from nucleon at high neutrino energies, $E_\nu$, from 100 GeV to 1000 EeV ($10^{12}~\GeV$). Our calculations are based on the latest CT18 NNLO parton distribution functions (PDFs) and their associated uncertainties. In order to make predictions for the highest energies, we extrapolate the...
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Hannah Day29/04/2023, 16:00
Neural networks (NNs) have gained significant attention in the physics community because of their ability to find non-trivial patterns in large datasets. However, developing a theory of NN learning has proven to be quite challenging because of the vast number of degrees of freedom in a typical NN. But fortunately, statistical field theory already provides tools for analyzing similar many-body...
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Anupam Ray29/04/2023, 16:15
Dark Matter (DM) remains mysterious. Despite decades of experimental efforts, its microscopic identity is still unknown. Terrestrial detectors are placing stringent exclusions on various parts of the DM parameter space, however, there exist a few blind-spots. In this talk, I will demonstrate how existing GW detectors can be used to unravel the particle nature of DM. More specifically, by...
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Robert McGehee29/04/2023, 16:30
While the experimental program to detect ever lighter dark matter is proceeding full steam ahead, the theory of such light, detectable dark matter is at a crossroads. I will detail two examples of sub-GeV hadrophilic dark matter models which these future direct detection endeavors may discover while highlighting the serious challenges model builders face. The first achieves probe-able direct...
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GEORGE WOJCIK29/04/2023, 16:45
In this talk, I discuss recent work on model building for the anomalous magnetic moment of the muon in the framework of so-called ``portal matter'', vector-like fermions charged under both the SM hypercharge and a hidden Abelian gauge group $U(1)_D$, which can induce kinetic mixing between the two groups at one loop. The portal matter fields are a well-motivated extension of simplified dark...
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