Conveners
HI: Precision Physics at High Intensities: HI-1: Precision Measurements using Muons and Pions
- Mark Pitt (Virginia Tech)
- Luchang Jin (UCONN / RBRC)
- Sophie Middleton (Caltech)
HI: Precision Physics at High Intensities: HI-2: g-2
- Luchang Jin (UCONN / RBRC)
- Sophie Middleton (Caltech)
- Mark Pitt (Virginia Tech)
HI: Precision Physics at High Intensities: HI-3
- Mark Pitt (Virginia Tech)
- Sophie Middleton (Caltech)
- Luchang Jin (UCONN / RBRC)
HI: Precision Physics at High Intensities: Joint HI-DM: Dark Matter at High Intensities
- Sophie Middleton (Caltech)
- Bjoern Penning (Unive)
- Luchang Jin (UCONN / RBRC)
- Deborah Pinna (Boston University)
- Mark Pitt (Virginia Tech)
HI: Precision Physics at High Intensities: Joint HI-HF: Rare Decays
- Racha Cheaib (DESY)
- Luchang Jin (UCONN / RBRC)
- Sophie Middleton (Caltech)
- Alejandro Vaquero Aviles-Casco (University of Utah)
- Mark Pitt (Virginia Tech)
- Carla Marin Benito (Universitat de Barcelona)
HI: Precision Physics at High Intensities: Joint HI / EW
- Stéphanie Roccia
- Sophie Middleton (Caltech)
- Nadia Fomin (University of Tennesee - Knoxville)
- Luchang Jin (UCONN / RBRC)
- Mark Pitt (Virginia Tech)
HI: Precision Physics at High Intensities: Joint HI-HF: CLFV and LFU
- Alejandro Vaquero Aviles-Casco (University of Utah)
- Mark Pitt (Virginia Tech)
- Carla Marin Benito (Universitat de Barcelona)
- Sophie Middleton (Caltech)
- Racha Cheaib (DESY)
- Luchang Jin (UCONN / RBRC)
HI: Precision Physics at High Intensities: Joint HI-QCD
- Sophie Middleton (Caltech)
- Tomasz Skwarnicki (Syracuse University)
- Luchang Jin (UCONN / RBRC)
- Mark Pitt (Virginia Tech)
- Martha Constantinou (Temple University)
- Justin Stevens (William & Mary)
Description
Precision Physics at High Intensities
The PIONEER experiment [1] will investigate rate pion decays and aims to measure the branch-
ing ratio $R_{e/μ} ≡ Γ(π^+ → e^+ν(γ))/Γ(π^+ → μ^+ν(γ))$ with a precision of 0.01 % in its first phase.
This marks an improvement by an order of magnitude with respect to the current experimental
uncertainty and would match the uncertainties of the theoretical predictions. This allows to test
lepton...
Limits on the charged lepton flavor violating (CLFV) process of $\mu\rightarrow e$ conversion are expected to improve by four orders of magnitude due to the next generation of experiments, Mu2e at Fermilab and COMET at J-PARC. While the kinematics of the decay of a trapped muon are ideal for detecting a signal of CLFV, the intervening nuclear physics presents a significant roadblock to the...
Lepton-flavor-violating decays of light pseudoscalars, $P=\pi^0,\eta,\eta'\to\mu e$, are stringently suppressed in the Standard Model up to tiny contributions from neutrino oscillations, so that their observation would be a clear indication for physics beyond the Standard Model. However, in effective field theory such decays proceed via axial-vector, pseudoscalar, or gluonic operators, which...
The AlCap experiment is set to measure comprehensive details of charged particles, photons and neutrons emitted after nuclear muon capture in Al and Ti at PSI, Switzerland. For photons, a high purity Ge detector was used to capture the spectra from these targets. In addition to those targets, measurements were made on W, Pb, stainless steel, poly and mylar to check for possible interferences...
Flavor-violating processes in the lepton sector have highly suppressed branching ratios in the standard model, mainly due to the tiny neutrino mass. This means that observing lepton flavor violating processes, such as muonium-antimuonium oscillations, in the next round of experiments would indicate the presence of physics beyond the standard model (BSM). We review theoretical calculations of...
The Fermilab E989 Muon g-2 experiment is a precise measurement of the muon anomalous magnetic moment $a_{\mu}$ by detecting decays of muons stored in a ring. The first result of the E989 Muon g-2 experiment, with $a_{\mu}$ uncertainty of 460 ppb, deviated by 4.2 standard deviations from the Standard Model theory prediction. The goal of E989 is to reach the precise of 140 ppb in $a_{\mu}$. Two...
The muon anomalous magnetic moment $(g-2)_{\mu}$ and the electric dipole moment are sensitive to new physics beyond the Standard Model (SM). There is a discrepancy between the Standard Model prediction for the $(g-2)_{\mu}$ and the values measured by the E821 collaboration at Brookhaven National Laboratory (BNL) and E989 collaboration at Fermilab at the more than $4 \sigma$ level. This may...
We present the recent lattice QCD computation of the hadronic vacuum polarization by the Budapest-Marseille-Wuppertal collaboration. We will also discuss ongoing improvements.
The production of cold antihydrogen atoms at CERN's Antiproton Decelerator (AD) has opened up the possibility to perform direct measurements of the Earth's gravitational acceleration on antimatter bodies. This is the main goal of the AEgIS collaboration: to measure the value of g using a pulsed source of cold horizontally travelling antihydrogen via a moiré deflectometer/Talbot-Lau...
The ALPHA experiment has conducted the highest precision measurements on antihydrogen to date in order to test matter / antimatter symmetries. Our recent demonstration of laser cooling antihydrogen represented not only a novel spectroscopic survey in the antiatom, but also an important technical milestone in improving our comparisons against hydrogen [1]. A cooled population of antihydrogen...
Two critical questions in particle physics remain unanswered--what is the particle nature of dark matter, and why is there no antimatter in the universe? Searches for neutron oscillations are an essential component of the worldwide program to understand baryon number violation and what comprises dark matter, but are underexplored experimentally. If dark matter is made up of a rich hidden...
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...
The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for a thermal origin of dark matter sharpen this mass range to within about an MeV to 100 TeV. Most of the stable constituents of known matter have masses in the MeV to GeV range, and a thermal origin for dark matter works in a simple and predictive manner in this...
Elucidating the nature of dark matter remains a central challenge in fundamental physics. A growing interest in light (sub-GeV) dark matter consisting of new particles coupling only feebly to ordinary matter has recently emerged. Low-energy, high luminosity colliders such as BABAR are ideally suited to probe these possibilities. In this talk, we will review searches for dark sectors and light...
Despite the success of the Standard Model (SM) of particle physics, there exist phenomena that it cannot explain, suggesting the existence of a more complete theory which is yet unknown. Rare decays of hadrons containing a b-quark provide a powerful way of exploring theories of physics beyond the SM. Hypothetical new particles could enhance the decay rates of these rare processes to a level...
Charged lepton flavor violation has long been recognized as unambiguous signature
of New Physics. Here we describe the physics capabilities and discovery potential
of New Physics models with charged lepton flavor violation in the tau sector as its
experimental signature. Current experimental status from the B-Factory experiments
BaBar, Belle and Belle II, and future prospects at Super Tau...
PREX-II and CREX were two experiments designed to measure the neutron skin thickness in $^{208}$Pb and $^{48}$Ca respectively. Both experiments used the parity-violating electron scattering (PVES) technique, which involved measuring the parity-violating cross-section asymmetry ($A_{pv}$) between left- and right-handed longitudinally polarized electron scattering off an unpolarized target. The...
The technique of parity-violating electron scattering, involving measurements of the asymmetry in the scattering of longitudinally polarized electrons off fixed targets, has become increasingly precise over the past three decades. Such asymmetries are sensitive to weak neutral current interactions (mediated by the Z boson) between electrons and quarks, or between two electrons, and can be...
The hadronic weak interaction provides unique probe of the strong dynamics that confine quarks into nucleons in the low energy non-perturbative QCD regime. Precision measurements of parity violating observables in few body NN systems can provide important benchmarks for models that aim to describe this low-energy non-perturbative QCD regime, as well as effective models that seek to describe...
A nuclear anapole moment (NAM)--a magnetic moment associated with a localized toroidal current--arises due to hadronic parity violating interactions between nucleons. The NAM can be detected via the coupling of its local magnetic field to the spin of a penetrating electron, such as an unpaired valence electron in a neutral atom. ZOMBIES is an experiment to measure NAMs using neutral polar...
In this talk I will start by reviewing the current status of the so-called neutral $B$-anomalies, a set of measurements in channels mediated by the $b \to s$ transition and involving muons in the final states. Several of these measurements disagree with SM predictions, and are coherently hinting at the presence of LFUV NP coupled to muons. After introducing the main groups performing global...
Charged lepton flavor violation refers to processes in which lepton family number is not conserved. Transitions among the $e$, $\mu$, and $\tau$ leptons without the emission of neutrinos --- not through the weak force –- would be unambiguous proof of a new force in nature outside the Standard Model. The discovery of the muon in 1937 immediately led to searching for the decay $\mu \rightarrow e...
The rate of semitauonic B decays has been consistently above theory expectations since these decays were first measured. Recently significant differences between the forward-backward asymmetry in $B\to D^{∗}e\nu$ and $B\to D^{*}\mu\nu$ were also reported. This talk presents recent results on lepton flavor universality tests from Belle II and LHCb.
The NA62 experiment at CERN collected world's largest dataset of charged kaon decays in 2016-2018, leading to the first observation of the ultra-rare K+ --> pi+ nu nu decay based on 20 candidates. Dedicated trigger lines were employed for collection of di-lepton final states, which allowed establishing stringent upper limits on the rates lepton flavor and lepton number violating kaon decays....
For years, it was agreed that the radius of the proton was $0.88$ fm. A 2010 measurement using a new muonic-hydrogen spectroscopy technique reported a result of $0.84$ fm, a $5\sigma$ discrepancy with the the accepted value, launching what has come to be known as the ``proton radius puzzle''. A flurry of explanations emerged in the aftermath, ranging from new physics to incorrect analysis...
In this talk, I will review the lattice QCD calculation of the electric and magnetic electric form factors and the extraction of the proton charge radius. I will use the recent work done by the NME collaboration [1], and updates to it (preliminary results with improved data sets) to illustrate the issues. These high statistics lattice QCD calculations, show that the electric and magnetic...
Relativistic heavy-ion beams at the LHC are accompanied by a large flux of equivalent photons, leading to multiple photon-induced processes. This talk presents a series of measurements of such processes performed by the ATLAS Collaboration. New measurements of exclusive dilepton production (electron, muon, and tau pairs) are discussed. Furthermore, the tau-pair production measurements can...
