After a brief summary of the current status for experimental searches of a permanent electric dipole moments, I delve into the various sources of CP-violation and the computational challenges associated with calculating the corresponding hadronic matrix elements using the lattice as a regulator. I then proceed detailing recent results obtained
on the neutron EDM highlighting the primary...
We share results from our lattice QCD study of the contribution of the isovector quark chromo-electric dipole moment (qcEDM) operator to the nucleon electric dipole moments (nEDM). The calculation was done on four 2+1+1-flavor of highly improved staggered quark (HISQ) ensembles employing Wilson-clover quarks to construct correlation functions. We employ the non-singlet axial Ward identity...
The search for Electric Dipole Moments (EDMs) of elementary particles is a powerful tool for the investigation of physics beyond the Standard Model (SM) of Particle Physics. As a permanent EDM violates $CP$ symmetry, measuring the EDM of a fundamental particle is a potential source of $CP$-violation that could, e.g., explain the matter-antimatter asymmetry in the universe.
Storage rings...
We discuss the use of transverse single-spin asymmetries (SSAs) at a future EIC as a probe of beyond the Standard Model (SM) physics. Our calculation uses the SM Effective Field Theory framework. We show that transverse SSAs at an EIC can provide complementary probes of the same parameters responsible for anomalous electric and magnetic dipole moments of both leptons and quarks, and may help...
Rare-earth iron garnets constitute a model system for Néel ferrimagnetism. These materials exhibit temperature-dependent orbital cancellation of the magnetism associated with the electron spins, leaving a dense ensemble of polarized electrons which are of interest as a source for exotic spin-dependent fifth-force searches. We have conducted two novel investigations of a ferrimagnetic terbium...
Neutrinos in the early Universe decoupled essentially in helicity eigenstates. As they propagate through the Universe, their helicities could be modified via two effects. First, neutrinos with a finite magnetic moment would rotate their spins with respect to their momenta as they encounter cosmic magnetic fields, modifying their helicities. Second, the bending of neutrino's spin by a...
Spin is one of the intrinsic properties of the fundamental particles. Yet we know very little about the fundamental origin of spin. The model of an electron as a spinning charged sphere, which could explain its magnetic moment, does not work due to its clash with the special theory of relativity. As such, we accept the formulation of spin based on the Dirac equation. But it is experimentally...
Neutron-antineutron oscillations and proton decay are long-sought manifestations particle unification models. At least one of these phenomena is expected to exist due to the observed baryon asymmetry of the Universe. Constraints on unification and beyond-standard models from existing and newly proposed experiments depend heavily on nucleon and nuclear matrix elements of quark-level BNV...
Baryogenesis requires baryon number violation. Certain extensions to the Standard Model have proposed the existence of an exact, but parity-conjugated, copy of the ordinary elementary particles called mirror particles. This mirror universe has specific testable implications, especially in the domain of neutral particle oscillation, including neutron to mirror-neutron $nn'$ oscillation, which...
Parity-violating interactions between nucleons are the manifestation of an interplay of strong and weak interactions between quarks in the nucleons. Compared to the dominant parity-conserving part, the parity-violating component of the nucleon-nucleon interaction is expected to be suppressed by approximately seven orders of magnitude or more. Due to the short range of the weak interactions,...
We present a study of strong parity-violating contributions that can be included in inclusive Deep Inelastic Scattering (DIS) off an unpolarized proton target. We show that a non vanishing parity-violating structure function arise even in the case of pure photon exchange, in contrast with standard results.
The size of the additional strong parity-violating term is estimated by fitting...
The phenomenon of parity violation in the Weak interaction has been used to study the fundamental interactions between the constituents of matter since its discovery, at ever increasing levels of precision. This need for precision has driven the evolution of experimental techniques to such an extent that parity experiments can now be used to investigate interactions at the smallest scales in...
The well-known Dirac's relativistic quantum mechanics prediction of $g=2$ for the magnetic dipole moment of a point particle, e.g., an electron, breaks down at the $10^{-3}$ level. The resulting magnetic anomaly, $a_e = (g − 2)/2$, is due to couplings to virtual particles excited in the vacuum. Due to its greater mass, the muon probes significantly deeper into the high-mass excitations of...
The absence of any signature for new physics beyond the standard model at
the Large Hadron Collider has left the field of elementary particle physics in a quandary. We know there is new physics out there: where best to look for it? Searches for certain rare processes provide ultra-sensitive probes for new physics and can reach mass scales unobtainable by any conceivable accelerator,...
