Conveners
Standard Model and Beyond
- Oleg Popov
Standard Model and Beyond
- John Gargalionis
Standard Model and Beyond
- Otari Sakhelashvili (Sydney University)
I report the progress in the 5-loop QED computation of g-2. Currently, there seems to be discrepancy in the 5-loop results obtained by two groups. I am trying to get an independent result by using the lattice simulation on the FUGAKU supercomputer.
Current ton-scale direct detection experiments have begun observing solar neutrinos. We probe the weak mixing angle using existing direct detection data. Leveraging recent measurements of $^8$B solar neutrinos via coherent neutrino-nucleus scattering by PandaX-4T and XENONnT, we demonstrate that these experiments can probe the weak mixing angle in a region complementary to that of dedicated...
The standard model (SM) prediction of massless neutrinos is experimentally inconsistent. Introducing new high-energy physics allows for neutrino masses to be generated via effective operators in the SM. Naturally, the SM is therefore regarded as an effective field theory (EFT), namely the SMEFT, and calls for a complete EFT implementation of the new physics. This is especially poignant for so...
Composite Higgs Models offer an attractive solution to the hierarchy problem. We extend previously examined models based on a SO(5) → SO(4) symmetry breaking pattern and 3rd generation quarks, with two representations of the τ and its neutrino. We conduct Bayesian global fits of these models using a wide array of constraints in order to find regions in the parameter volume that best fit...
BABAR performed the first two-dimensional unbinned angular analysis of the semileptonic decay $\bar B \rightarrow D \ell^- \bar \nu_\ell$ with the full data set, where $\ell$ is either an electron or a muon. The other $B$ meson is tagged via hadronic reconstruction. A novel data-driven signal-background separation procedure with minimal dependence on simulation has been developed that...
High statistics data sets collected in the region of the $\Upsilon(4S)$ resonance can provide extremely powerful tests of possible physics beyond the standard model. Searches with the BABAR experiment at the SLAC PEP-II $B$ factory have placed stringent constraints on possible dark-sector particles and interactions across a variety of models, for masses spanning the MeV - GeV range. Recent...
Long Lived Particles (LLPs) are predicted in many models of possible physics beyond the Standard Model which seek to explain key questions in modern physics. The MATHUSLA experiment is a proposed LLP detection experiment for the CERN Large Hadron Collider (LHC). Consisting of a large decay volume instrumented with layers of scintillator tracking detectors positioned on the surface...
Supersymmetry (SUSY) remains a leading candidate for physics beyond the Standard Model (SM). However, thus far, the LHC has not found any evidence of supersymmetry. The lower bound of the gluino mass exceeds 2 TeV and around 1 TeV for the stop in the bulk of parameter space. The fine-tuning of the electroweak symmetry breaking (EWSB) in the Minimal Supersymmetric Standard Model (MSSM) is...
The Belle II collaboration recently announced that they observed the B→ Kνν decay process for the first time. However, their result encounters a 2.7σ deviation from the Standard Model calculation. Additionally, Fermilab released new data on muon g − 2 away from the SM expectation with 5.1σ. In this talk, I would like to talk about the simplest UV-complete U(1)Lµ−Lτ-charged complex scalar Dark...
The kinetic mixing can transfer the supersymmetry breaking from the hidden sector to the visible sector. We study dark gauge mediation supersymmetry breaking (dark GMSB) with large kinetic mixing. The massless dark photon allows such a large kinetic mixing, so the effect of the dark GMSB can become significant in the soft mass terms. For the neutralino sector, the dominant components in the...
Radiative symmetry breaking (i.e. classically conformal) theories provide an appealing explanation for electroweak symmetry breaking and address the hierarchy problem. Such theories also imply one or more first-order phase transitions (FOPTs) in the early Universe, deeply affecting the thermal history and potentially providing novel solutions to puzzles of dark matter and baryon asymmetry....
The present talk will cover an extension of a scotogenic and its modular $\mathcal{A}_4$ variation a step forward and demonstrates scotogenic modular $\mathcal{A}_4$ non-supersymmetric realization. To achieve this non-holomorphic modular symmetries come to rescue. Advantage of the current construction is the compactness of the model content and absence of the supersymmetric fields. Neutrino...
The Strong CP Problem is solved elegantly and economically by endowing the Standard Model of Particle Physics with a new complex scalar, and a spontaneously broken, anomalous global Peccei-Quinn (PQ) symmetry whose Goldstone boson is called the axion. Unfortunately, this solution may be spoiled by the global symmetry-breaking effects generically expected to arise in any effective theory of...
