Conveners
Precision Physics at High Intensities: Parallel 1
- Allison Zec (University of New Hampshire)
Precision Physics at High Intensities: Parallel 3
- Dylan Palo (Fermilab)
Precision Physics at High Intensities: Parallel 9
- Paul King (Ohio University)
Precision Physics at High Intensities: Parallel 5
- Dylan Palo (Fermilab)
Precision Physics at High Intensities: Parallel 10
- Allison Zec (University of New Hampshire)
Modern first-principles (or “ab initio”) many-body simulations make it possible to compute the structure of atomic nuclei from scratch, starting from effective field theories of quantum chomodynamics. Recent developments have extended the reach of these simulations to the heaviest stable isotopes, to higher precision, and to new applications including many studies of fundamental interactions...
I will give a theory overview talk about lepton flavor violation and discuss the Effective Field Theory approach.
The Mu2e experiment at Fermilab aims to observe
neutrinoless muon to electron conversion in the presence of an Al nucleus ($\mu^{-}$Al \rightarrow e$^{-}$Al). The signal is a monochromatic conversion electron of energy 104.97\,MeV. This process is an example of the charged lepton flavor violation (CLFV) which is highly suppressed in the Standard Model (SM) and lies far beyond the reach of...
Mu2e experiment at Fermilab will search for the process of neutrino-less $\mu^- \to e^-$ conversion on Al. The signature of this process is a monocromatic electron with the energy of 104.97 MeV. The systematic uncertainty on the reconstructed electron momentum, $\sigma_P$, is required to be $\le$ 100 keV/c. For that, the momentum scale of the experiment has to be known with the relative...
The muon’s anomalous magnetic moment is now known experimentally to a precision of 0.19 ppm from the most recent results of the Fermilab g-2 experiment. Further improvement is expected this year, as the analysis of the final 4th, 5th and 6th runs are nearing completion. On the theoretical side, the largest source of uncertainty in the 0.37 ppm determination from the muon g-2 theory initiative...
The uncertainty in the Standard Model (SM) expectation for the anomalous magnetic moment of the muon is currently dominated by that on the hadronic vacuum polarization (HVP) contribution. Discrepancies have been observed between results for this contribution (and related “windowed” quantities) obtained on the lattice and those obtained dispersively, using experimentally measured $e^+...
The MUonE experiment at CERN aims to determine the leading-order hadronic contribution to the muon by an innovative approach, using elastic scattering of 160 GeV muons on atomic electrons in a low-Z target. The M2 beam line at CERN provides the necessary intensity needed to reach the statistical goal in few years of data taking. The experimental challenge relies in the precise control of the...
Working in an effective field theory framework, we consider the conversion of a muon to an electron in the presence of a nucleus, mediated by Lorentz- and CPT-violating operators. A subset of these operators are uniquely constrained by this channel, and their bounds (coming from the SINDRUM II experiment) are the first reported. We also provide sensitivity estimates for upcoming searches by...
PIONEER is a rare pion decay experiment that will run at the Paul Scherrer Institute (PSI) in Switzerland. In its initial phase, the primary objective is to improve the measurement of the $\pi\rightarrow e \nu$ branching ratio: $R_{e/\mu}=\mathcal{B}(\pi\rightarrow e \nu (\gamma)) / \mathcal{B}(\pi\rightarrow \mu \nu (\gamma))$. PIONEER aims to improve on, by more than an order of magnitude,...
The NA62 experiment at CERN collected the world's largest dataset of charged kaon decays, leading to the most precise measurement of the branching ratio of the ultra-rare $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay. In this talk NA62 reports recent results from precision measurements of kaon and pion decays, using data samples collected in 2017-2018. A sample of $K^+ \rightarrow \pi^+ \gamma...
The Belle and Belle~II experiments have collected a $1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains approximately 1.3 billion $e^+e^-\to \tau^+\tau^{-}$ events, which we use to search for lepton-flavour violating decays. We present searches for $\tau-\to \mu^-\mu^-\mu^+$, $\tau^-\to\Lambda\pi^-$, and...
The Fermilab Muon g-2 experiment measures the muon's anomalous magnetic moment to a precision of less than 140 parts per billion. The value is proportional to the anomalous spin precession frequency in the presence of a uniform magnetic field, for muons contained within the g-2 storage ring. Spin precession frequency is extracted from the time distribution of the muon's decay positrons...
The Muon g-2 experiment at Fermilab measures the muon magnetic moment anomaly in order to test a potential discrepancy between the experimental value and the Standard Model prediction. During the experiment, muons traveled through a 15-meter-diameter magnetic storage ring, with the magnetic moment anomaly revealed through the ratio between anomalous muon precession frequency and the strength...
The MuonEDM experiment at the Paul Scherrer Institut (PSI) aims to directly measure the muon's electric dipole moment (EDM), with a sensitivity better than $6\times 10^{-23} e\cdot cm$ in its final phase. Achieving a measurement greater than this sensitivity would indicate new physics, revealing a larger CP violation than the known sources in the standard model.
The experiment utilizes the...
The most precise measurements of the mean charge radius of the proton use muonic hydrogen spectroscopy. The significant disagreement between these measurements and earlier atomic hydrogen spectroscopy and electron-proton elastic scattering data is known as the "proton radius puzzle". More recent electronic measurements have produced a range of results, but with poor consistency, far exceeding...
Muonium is a pure leptonic binary system consisting of a positive muon and an electron, and its level structure can be calculated with high precision. The Muonium Spectroscopy Experiment Using Microwave (MuSEUM) experiment aims to verify the quantum electromagnetic dynamics theory and determine the positive muon magnetic moment and mass by precise measurements of the ground-state hyperfine...
This contribution presents the latest experimental results from the QUARTET collaboration on high-resolution muonic lithium spectroscopy, aiming for the precise determination of nuclear charge radii for lithium isotopes. Precise measurements of absolute nuclear charge radii are a crucial ingredient for precision QED tests and serve as ideal benchmarks for modern nuclear structure theory [1]....
