A5055261013- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Astronomy and Astrophysical Research
- Muon and positron interactions and applications
- Physics of Superconductivity and Magnetism
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Antenna Design and Optimization
- Advanced Thermodynamic Systems and Engines
- Radio Frequency Integrated Circuit Design
- Galaxies: Formation, Evolution, Phenomena
- Radiation Detection and Scintillator Technologies
Fermi National Accelerator Laboratory
2014-2024
University of Virginia
2024
California Institute of Technology
2024
University of Mississippi
2019-2021
University of Colorado System
2016
University of California, Riverside
2010-2015
United States Department of Energy
2015
University of Chicago
1990-2014
Stanford University
2014
European Organization for Nuclear Research
2013
We present measurements of the $E$-mode ($EE$) polarization power spectrum and temperature-$E$-mode ($TE$) cross-power cosmic microwave background using data collected by SPT-3G, latest instrument installed on South Pole Telescope. This analysis uses observations a $1500\text{ }\text{ }{\mathrm{deg}}^{2}$ region at 95, 150, 220 GHz taken over four-month period in 2018. report binned values $EE$ $TE$ spectra angular multipole range $300\ensuremath{\le}\ensuremath{\ell}<3000$, multifrequency...
We have compared the decay rates of ${K}_{L}$ and ${K}_{S}$ to ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ ${\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ final states using a subset data from KTeV experiment (E832) at Fermilab. find that direct-CP-violation parameter $\mathrm{Re}({\ensuremath{\epsilon}}^{\ensuremath{'}}/\ensuremath{\epsilon})$ is equal...
We present precise tests of CP and CPT symmetry based on the full dataset K to pipi decays collected by KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, 1999. This contains 16 million 2pi0 69 pi+pi- decays. measure direct violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. find KL-KS mass difference Deltam (5270 12)x10^6 hbar/s KS lifetime tauS (89.62 0.05)x10-12 s. also several parameters that test invariance. between phase indirect parameter, epsilon,...
Bubble Chambers provided the dominant particle detection technology in accelerator experiments for several decades, eventually falling into disuse with advent of other techniques. We report here on first period operation an ultra-clean, room-temperature bubble chamber containing 1.5 kg superheated CF$_{3}$I, a target maximally sensitive to spin-dependent and -independent Weakly Interacting Massive Particle (WIMP) couplings. An exposure excess 250 kg-days is obtained, live-time fraction...
SPT-3G is the third survey receiver operating on South Pole Telescope dedicated to high-resolution observations of cosmic microwave background (CMB). Sensitive measurements temperature and polarization anisotropies CMB provide a powerful dataset for constraining cosmology. Additionally, surveys with arcminute-scale resolution are capable detecting galaxy clusters, millimeter-wave bright galaxies, variety transient phenomena. The instrument provides significant improvement in mapping speed...
We present a series of measurements based on ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}_{L,S}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}$ decays collected in 1996--1997 by the $\mathrm{KTeV}$ experiment (E832) at Fermilab. compare these four $\stackrel{\ensuremath{\rightarrow}}{K}\ensuremath{\pi}\ensuremath{\pi}$ decay rates to measure direct $\mathrm{CP}$ violation parameter...
The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay KL→π0e+e− . This mode is expected to have a significant CP violating component. measurement of its branching ratio could support standard model or indicate existence new physics. Letter reports results from 1999–2000 data set. One event observed with an background 0.99±0.35 events. We set limit on 3.5×10−10 90% confidence level. Combining previous result based taken in 1997 yields final KTeV result:...
The Q/U Imaging ExperimenT (QUIET) employs coherent receivers at 43GHz and 95GHz, operating on the Chajnantor plateau in Atacama Desert Chile, to measure anisotropy polarization of CMB. QUIET primarily targets B modes from primordial gravitational waves. combination these frequencies gives sensitivity foreground contributions diffuse Galactic synchrotron radiation. Between 2008 October 2010 December, >10,000hours data were collected, first with 19-element array (3458hours) then 90-element...
The branching ratio of the rare decay ${\ensuremath{\pi}}^{0}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}$ has been measured precisely, using complete data set from KTeV E799-II experiment at Fermilab. We observe 794 candidate events ${K}_{L}\ensuremath{\rightarrow}3{\ensuremath{\pi}}^{0}$ as a source tagged ${\ensuremath{\pi}}^{0}$s. expected background is $52.7\ifmmode\pm\else\textpm\fi{}11.2$ events, predominantly high ${e}^{+}{e}^{\ensuremath{-}}$ mass...
The Q/U Imaging ExperimenT (QUIET) has observed the cosmic microwave background (CMB) at 43 and 95GHz. 43-GHz results have been published in QUIET Collaboration et al. (2011), here we report measurement of CMB polarization power spectra using 95-GHz data. This data set comprises 5337 hours observations recorded by an array 84 polarized coherent receivers with a total sensitivity 87 uK sqrt(s). Four low-foreground fields were observed, covering ~1000 square degrees effective angular...
The Q/U Imaging ExperimenT (QUIET) is designed to measure polarization in the Cosmic Microwave Background, targeting imprint of inflationary gravitational waves at large angular scales (~ 1 degree). Between 2008 October and 2010 December, two independent receiver arrays were deployed sequentially on a 1.4 m side-fed Dragonian telescope. polarimeters which form focal planes use highly compact design based High Electron Mobility Transistors (HEMTs) that provides simultaneous measurements...
The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the KL meson in three decay modes. We observe no events signal region any modes studied, and we set following upper limits their branching ratios at 90% C.L.: BR(KL→π0μ±e∓)<7.6×10−11; BR(KL→π0π0μ±e∓)<1.7×10−10; BR(π0→μ±e∓)<3.6×10−10. This result represents a factor 82 improvement ratio limit KL→π0μ±e∓ is first reported KL→π0π0μ±e∓.Received 21 November 2007DOI:https://doi.org/10.1103/PhysRevLett.100.131803©2008...
We present new measurements of ${K}_{L}$ semileptonic form factors using data collected in 1997 by the KTeV (E832) experiment at Fermilab. The are based on $1.9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}\ensuremath{\nu}$ and $1.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$...
We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V(us)| based on new measurements six largest K(L) branching fractions and semileptonic form factors by KTeV (E832) experiment at Fermilab. find |V(us)|=0.2252+/-0.0008(KTeV)+/-0.0021(ext), where errors are from external sources. also use measured to determine CP violation |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).
We report on a new measurement of the branching ratio B(KL→π0γγ) using KTeV detector. reconstruct 1982 events with an estimated background 608, that results in B(KL→π0γγ)=(1.29±0.03stat±0.05syst)×10−6. also measure parameter, aV, which characterizes strength vector meson exchange terms this decay. find aV=−0.31±0.05stat±0.07syst. These utilize full data set collected from 1997 to 2000 and supersede earlier measurements aV.1 MoreReceived 28 April...
This work presents the procedures used at Argonne National Laboratory to fabricate large arrays of multichroic transition-edge sensor (TES) bolometers for cosmic microwave background (CMB) measurements. These detectors will be assembled into focal plane SPT-3G camera, third generation CMB camera installed in South Pole Telescope. The complete have approximately 2690 pixels, a total 16 140 TES bolometric detectors. Each pixel is comprised broad-band sinuous antenna coupled Nb microstrip line....
We report the first observation of a manifestly CP violating effect in K(L)-->pi(+)pi(-)e(+)e(-) decay mode. A large asymmetry was observed distribution these decays CP-odd and T-odd angle straight phi between planes e(+)e(-) pi(+)pi(-) pairs K(L) center mass system. After acceptance corrections, overall is found to be [13.6+/-2. 5(stat)+/-1.2(syst)]%. This largest CP-violating yet when integrating over entire phase space mode such an angular variable.
We present new measurements of the six largest branching fractions ${K}_{L}$ using data collected in 1997 by KTeV experiment (E832) at Fermilab. The results are $B({K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}{\mathrm{e}}^{\ensuremath{\mp}}\ensuremath{\nu})=0.4067\ifmmode\pm\else\textpm\fi{}0.0011$,...
We present a measurement of the charge asymmetry delta(L) in mode K(L)-->pi(+/-)e(-/+)nu based on 298 x 10(6) analyzed decays. measure value = [3322+/-58(stat)+/-47(syst)]x10(-6), good agreement with previous measurements and 2.4 times more precise than current best published result. The result is used to place stringent limits CPT DeltaS DeltaQ violation neutral kaon system.
We present a new determination of the parity neutral pion via double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at KTeV-E799 experiment Fermi National Accelerator Laboratory. confirm negative pi0 and place limit on scalar contributions to pi0-->e+e-e+e- amplitude less than 3.3% assuming CPT conservation. The pi0gamma*gamma* form factor is well described by momentum-dependent model with slope parameter...
The third generation receiver for the South Pole Telescope, SPT-3G, will make extremely deep, arcminuteresolution maps of temperature and polarization cosmic microwave background. SPT-3G enable studies B-mode signature, constraining primordial gravitational waves as well effect massive neutrinos on structure formation in late universe. achieve exceptional sensitivity through a focal plane ~16,000 transition-edge sensor bolometers, an order magnitude more than current SPTpol receiver. uses...