Conveners
QCD and New Physics: E1a (Parallel E)
- Ross Young
QCD and New Physics: E1b (Parallel E)
- Daniel Nogradi
QCD and New Physics: E2a (Parallel E)
- Wolfgang Korsch (University of Kentucky)
QCD and New Physics: E3a (Parallel E)
- Giulia Ricciardi
QCD and New Physics: E4b (Parallel E)
- Rajan Gupta (Los Alamos National Lab)
QCD and New Physics: E4c (Parallel E)
- Susan Gardner
A 22 GeV upgrade to the CEBAF accelerator at Jefferson Lab has been made possible by recent novel advances in accelerator technology. CEBAF’s envisioned capabilities, at the highest luminosities, will enable exciting opportunities to give scientists the full suite of tools necessary to comprehensively understand how QCD builds hadronic matter in the valence region. This talk will focus on the...
There is a flavor number range of $SU(3)$ gauge theory, $N_f^* < N_f < 16.5$, where spontaneous chiral symmetry breaking does not occur and the model is conformal. The upper end $16.5$ is determined by the 1-loop $\beta$-function but the lower end $N_f^*$ may be determined by non-perturbative phenomena. In this contribution a new approach is presented to estimate or constrain $N_f^*$: high...
The Belle II collaboration recently announced that they observed the $B^+ \rightarrow K^+ \nu \bar{\nu}$ decay process for the first time. This mode has been theoretically identified as a very clean channel. However, their result encounters a 2.7 $\sigma$ deviation from the Standard Model (SM) calculation. On the other hand, last year, Fermilab released new data on muon g−2 away from the SM...
At the TeV scale, low-energy precision observations of neutron characteristics provide unique probes of novel physics. Precision studies of neutron decay observables are susceptible to beyond the Standard Model (BSM) tensor and scalar interactions, while the neutron electric dipole moment, $d_n$, also has high sensitivity to new BSM CP-violating interactions. To fully utilise the potential of...
We detail dispersive evaluations of various window quantities relevant to the determination of the HVP contribution to the anomalous magnetic moment of the muon in the Standard Model, and compare these to lattice evaluations of the same quantities. Of particular interest are the light-quark connected window quantities, where dispersive results obtained using data prior to the new CMD-3 2-pion...
I will discuss the first lattice QCD calculation of the universal axial γW-box contribution to both superallowed nuclear and neutron beta decays. This contribution emerges as a significant component within the theoretical uncertainties surrounding the extraction of |Vud| from superallowed decays, thereby making an important impact on the precision test of the first-row CKM unitarity.
A method to sum over (unknown) final states is proposed in
the lattice QCD calculation. Systematically improvable in principle,
but it induces new problems, including the one related to the
approximation of the kernel function. Potential applications other than
the inclusive decays will be discussed too.
Observables that violate lepton flavor symmetry are sensitive probes of physics beyond the Standard Model (BSM), since any observation would be a clear BSM signal. Limits on $\mu\to e$ conversion in nuclei are amongst the most stringent ones available, and are even expected to improve by up to four orders of magnitude at Mu2e and COMET. In this talk, I will discuss, based on an...
The forthcoming Mu2e and COMET experiments will search for electrons produced via the neutrinoless conversion of muons captured onto the atomic nucleus $^{27}$Al, improving existing limits on charged lepton flavor violation (CLFV) by roughly four orders of magnitude and probing new physics at scales in excess of 10,000 TeV. Many proposed extensions of the standard model give rise to observable...
We propose a new approach to search for light dark matter (DM) in the mass range of keV-GeV via inelastic nucleus scattering at large-volume neutrino detectors such as Borexino, DUNE, JUNO, and Super-/Hyper-K. The approach uses inelastic nuclear scattering of cosmic-ray boosted DM, enabling a low-background search for DM in these experiments. The large-volume neutrino detectors with higher...
Ab initio nuclear structure theory aims to predict the structure of atomic nuclei from "first principles," employing systematically improvable approximations for nuclear forces and many-body wave functions. This ab initio paradigm has been established as a consistent, precise framework for predicting the structure of medium-mass nuclei with the ability to fully quantify uncertainties. In...
Since the 2017 observation of gravitational wave and electromagnetic signals from a neutron star merger, binary mergers have emerged as a powerful environment in which to study physics beyond the standard model (BSM). As an example of BSM physics, and due to their connection to QCD, I will focus on axions and describe the various roles they may play in neutron star mergers, as well as the...
FASER, the Forward Search Experiment, at the Large Hadron Collider (LHC) aims to study neutrino interactions with the unexplored high energy range and to search for light, weakly-interacting new particles. The detector is located 480 m downstream of the ATLAS interaction point along the beam axis.
The FASER collaboration announced the first direct observation of collider neutrinos, using the...
The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the KEK laboratory. Belle II will be able to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the matrix elements and their phases, with unprecedented precision and explore flavor physics with B, charmed mesons, and τ leptons. We report on recent results obtained by...
Sp(4) gauge theory coupled to fermions in the fundamental and two-index antisymmetric representations is a viable candidate for the ultra-violet completion of composite Higgs models. This theory facilitates the generation of the top-quark mass through the partial-compositeness mechanism, where the chimera baryons (spin-1/2 bound states of fermions in two different representations) serve as...
Non-Abelian confinement of quarks in QCD is responsible for 98% of the energy density of visible matter in the Universe whereas the Higgs mechanism is responsible for the remaining 2%. Dark matter has five times the energy density of normal matter so we consider dark matter energy models where non-Abelian confinement of dark quarks also occurs. Dark confinement enables a new feature where...
The confinement of elementary particles and the decay of the false vacuum are two paradigmatic predictions of quantum field theory. In their simplest formulation, the two phenomena can be understood as two facets of an underlying symmetry-breaking mechanism: the degeneracy of a double-degenerate vacuum is lifted by adding an explicit symmetry-breaking external field. Confined states are false...
Assesment of values and uncertainties of the cross section of quasi-elastic scattering of electron (anti-)neutrinos on nucleons, also known as inverse beta decay in the case of antineutrinos.
The coherent elastic scattering of neutrinos from nuclei can act as a
probe of not only standard model and nuclear physics but also beyond-standard model physics - including some models of dark matter. To make the most of future high-statistics experiments, we require precise predictions for the scattering cross sections. I will present results of nuclear shell model calculations that we've...
Simulations of lattice QCD have emerged as the most reliable tool for making predictions of the low energy properties of hadrons and of quarks and gluons composing them with control over all systematic uncertainties. In this review, I will cover the status of the calculations of quantities that are needed in the analysis of neutrinos scattering off nuclear targets. These include the axial...
We discuss a tantalizing possibility that misinterpretation of the reconstructed missing momentum may have yielded the observed discrepancies among measurements of the W-mass in different collider experiments. We introduce a proof-of-principle scenario characterized by a new physics particle, which can be produced associated with the W-boson in hadron collisions and contributes to the net...
In this talk we show that inclusive single-spin asymmetries (SSAs) with transversely
polarized electrons or protons at a future electron ion collider (EIC) are sensitive to new physics
contributions to electroweak dipole operators of electrons and quarks. We use the Standard Model
Effective Field Theory (SMEFT) to parameterize possible heavy new physics contributions to these
couplings. We...
We discuss searches for new physics at both the LHC and the EIC within
the Standard Model Effective Field Theory (SMEFT) framework. Drell-Yan
probes of the SMEFT parameter space suffer from degeneracies due to
the limited number of measured observables. The EIC, with the
potential to polarize both beams, can resolve these blind spots in the
LHC coverage. We quantify the important role...
