A5068093971- Particle physics theoretical and experimental studies
- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Neutrino Physics Research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Fusion materials and technologies
- Nuclear Materials and Properties
- Molecular Junctions and Nanostructures
- Radiation Therapy and Dosimetry
- Physics of Superconductivity and Magnetism
- Surface and Thin Film Phenomena
Fermi National Accelerator Laboratory
2022-2024
City College
2021
York College, City University of New York
2013-2018
City University of New York
2015-2018
The Graduate Center, CUNY
2018
Uppsala University
2018
Boston University
2001-2013
We report a measurement of the positive muon lifetime to precision 1.0 ppm; it is most precise particle ever measured. The experiment used time-structured, low-energy beam and segmented plastic scintillator array record more than 2×1012 decays. Two different stopping target configurations were employed in independent data-taking periods. combined results give τμ+(MuLan)=2 196 980.3(2.2) ps, 15 times as any previous experiment. gives value for Fermi constant: GF(MuLan)=1.166 378 8(7)×10−5...
We present a detailed report of the method, setup, analysis and results precision measurement positive muon lifetime. The experiment was conducted at Paul Scherrer Institute using time-structured, nearly 100%-polarized, surface beam segmented, fast-timing, plastic scintillator array. employed two target arrangements; magnetized ferromagnetic with ~4 kG internal magnetic field crystal quartz in 130 G external field. Approximately 1.6 x 10^{12} positrons were accumulated together data yield...
The MuCap experiment at the Paul Scherrer Institute has measured rate L_S of muon capture from singlet state muonic hydrogen atom to a precision 1%. A beam was stopped in time projection chamber filled with 10-bar, ultra-pure gas. Cylindrical wire chambers and segmented scintillator barrel detected electrons decay. is determined difference between mu- disappearance free decay rate. result based on analysis 1.2 10^10 decays, which we extract = (714.9 +- 5.4(stat) 5.1(syst)) s^-1 derive...
The mean life of the positive muon has been measured to a precision 11 ppm using low-energy, pulsed beam stopped in ferromagnetic target, which was surrounded by scintillator detector array. result, tau(micro)=2.197 013(24) micros, is excellent agreement with previous world average. new average 019(21) micros determines Fermi constant G(F)=1.166 371(6)x10(-5) GeV-2 (5 ppm). Additionally, measurement positive-muon lifetime needed determine nucleon pseudoscalar coupling g(P).
Z' bosons that couple preferentially to the third generation fermions can arise in models with extended weak (SU(2)xSU(2)) or hypercharge (U(1)xU(1)) gauge groups. We show existing limits on quark-lepton compositeness set by LEP and Tevatron experiments translate into lower bounds of order a few hundred GeV masses these bosons. Resonances this mass be directly produced at Tevatron. Accordingly, we explore detail Run II using process p pbar -> tau e mu. also comment possibility...
Background: The rate \lambda_pp\mu\ characterizes the formation of pp\mu\ molecules in collisions muonic p\mu\ atoms with hydrogen. In measurements basic weak muon capture reaction on proton to determine pseudoscalar coupling g_P, occurs from both atomic and molecular states. Thus knowledge is required for a correct interpretation these experiments. Purpose: Recently MuCap experiment has measured \Lambda_S singlet atom, employing low density active target suppress (PRL 110, 12504 (2013))....
Received 7 February 2011DOI:https://doi.org/10.1103/PhysRevLett.106.079901© 2011 American Physical Society
We look at a number of simple, but representative, models extended electroweak gauge structures, and present the general contributions to ${a}_{\ensuremath{\mu}}$ from heavy ${Z}^{\ensuremath{'}}$ ${W}^{\ensuremath{'}}$ bosons. Of we have examined, none can explain observed discrepancy between current experimental value standard model prediction if require that fields by themselves. In context with new matter as well additional discussed here, however, field be substantial important part discrepancy.
CERN LEP I and II data can be used to constrain technicolor models with light, neutral pseudo-- Nambu-Goldstone bosons ${P}^{a}.$ We use published limits on branching ratios cross sections for final states photons, large missing energy, jet pairs, or $b\overline{b}$ pairs the anomalous ${P}^{a}{Z}^{0}{Z}^{0},$ ${P}^{a}{Z}^{0}\ensuremath{\gamma},$ ${P}^{a}\ensuremath{\gamma}\ensuremath{\gamma}$ couplings. From these results, we derive bounds size of gauge group number technifermion doublets...
In this note we present general expressions at one loop order that can be used to calculate the contributions anomalous magnetic moment of fundamental, charged Dirac fermions. particular, provide for and neutral scalar gauge boson with vector axial couplings fermion interest. The calculations presented in were originally derived use author's letter, hep-ph/0108080. We have chosen document make available results derivations hope they will also useful others. Our reproduce Standard Model...
Lepton collider experiments can search for light technipions in final states made striking by the presence of an energetic photon: $e+e- \to \photon\technipion$. To date, searches have focused on either production through anomalous coupling to electroweak gauge bosons or a technivector meson (\technirho, \techniomega) resonance. This paper creates combined framework which both contributions are included. will allow stronger and more accurate limits technipion be set using existing data from...
The Snowmass report on rare processes and precision measurements recommended Mu2e-II a next generation muon facility at Fermilab (Advanced Muon Facility) as priorities for the frontier. Workshop future program FNAL was held in March 2023 to discuss design studies Mu2e-II, organizing efforts facility, identify synergies with other (e.g., collider). Topics included high-power targetry, status of R&D development compressor rings, FFA concepts experiments (conversion, decays, muonium...
The Mu2e experiment at Fermilab is devoted to search for the conversion of a negative muon into an electron in field nucleus without emission neutrinos. One main parts experimental setup its Target Station which pions are generated interactions 8-GeV primary proton beam with tungsten target. A large-aperture 5-T superconducting production solenoid (PS) enhances pion collection, and S-shaped transport (TS) delivers muons detector. heat radiation shield (HRS) protects PS first TS coils. dump...
The MuLan experiment will measure the lifetime of positive muon to 1 ppm. Within Standard Model framework, this permit a determination Fermi Constant 0.5 I present an update on our progress and achievements date.