A5104622572- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetic confinement fusion research
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- Quantum optics and atomic interactions
- Cosmology and Gravitation Theories
- Advanced NMR Techniques and Applications
- Medical Imaging Techniques and Applications
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Laser-Plasma Interactions and Diagnostics
Los Alamos National Laboratory
2015-2024
Universiti Putra Malaysia
2024
Campbell Collaboration
2022
University of Baltimore
2021
Johns Hopkins University
2021
University of Tennessee at Knoxville
2020
Duke University
2013-2019
Los Alamos Medical Center
2017
Triangle Universities Nuclear Laboratory
2013-2015
University of Illinois Urbana-Champaign
2006-2015
The observation of neutrinoless double-beta decay (0${\nu}{\beta}{\beta}$) would show that lepton number is violated, reveal neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective masses 15 - 50 meV, will require a tonne-scale excellent energy resolution extremely low backgrounds, at level $\sim$0.1 count /(FWHM$\cdot$t$\cdot$yr) in region signal. current generation $^{76}$Ge experiments...
The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. Demonstrator comprises 44.1 kg (29.7 enriched ^{76}Ge) split between two modules contained a low background shield at the Sanford Underground Research Facility Lead, South Dakota. Here we present results from data taken during construction, commissioning, and start full operations. We achieve unprecedented energy resolution 2.5 keV FWHM Q_{ββ} very with no...
The Majorana Demonstrator searched for neutrinoless double-β decay (0νββ) of ^{76}Ge using modular arrays high-purity Ge detectors operated in vacuum cryostats a low-background shield. with up to 40.4 kg (27.2 enriched ∼88% ^{76}Ge). From these measurements, the has accumulated 64.5 yr active exposure. With world-leading energy resolution 2.52 keV FWHM at 2039 Q_{ββ} (0.12%), we set half-life limit 0νββ T_{1/2}>8.3×10^{25} (90% C.L.). This provides range upper limits on m_{ββ} (113-269) meV...
We report the first measurements of inclusive W and Z boson cross sections times corresponding leptonic branching ratios for p pbar collisions at sqrt{s} = 1.96 TeV based on decays bosons into electrons muons. The data were recorded with CDF II detector Fermilab Tevatron correspond to an integrated luminosity 72.0 +/- 4.3 pb-1. test e-mu lepton universality in by measuring ratio W->mu nu W->e determine a value 0.991 0.004(stat.) 0.011(syst.) W-l-nu couplings (g_mu/g_e). Since there is no...
We present the first measurement of Bs-Bsbar oscillation frequency Delta m_s. use 1 fb^-1 data from p-pbar collisions at sqrt{s}=1.96 TeV collected with CDF II detector Fermilab Tevatron. The sample contains signals 3,600 fully reconstructed hadronic Bs decays and 37,000 partially semileptonic decays. measure probability as a function proper decay time that same, or opposite, flavor production, we find signal consistent oscillations. random fluctuations could produce comparable is 0.2%....
The Majorana Collaboration is operating an array of high-purity Ge detectors to search for the neutrinoless double-$\ensuremath{\beta}$ decay $^{76}\mathrm{Ge}$. Demonstrator consists 44.1 kg (29.7 enriched 88% in $^{76}\mathrm{Ge}$) split between two modules constructed from ultraclean materials. Both are contained a low-background shield at Sanford Underground Research Facility Lead, South Dakota. We present updated results on $^{76}\mathrm{Ge}$ with $26.0\ifmmode\pm\else\textpm\fi{}0.5$...
The Majorana Demonstrator neutrinoless double-beta decay experiment comprises a 44 kg (30 enriched in ^{76}Ge) array of p-type, point-contact germanium detectors. With its unprecedented energy resolution and ultralow backgrounds, also searches for rare event signatures from beyond standard model physics the low region below 100 keV. In this Letter, we test continuous spontaneous localization (CSL) model, one mathematically well-motivated wave function collapse models aimed at solving...
This article presents a measurement of the top quark mass using CDF II detector at Fermilab. Colliding beams protons and anti-protons Fermilab's Tevatron (sqrt{s}=1.96 TeV) produce top/anti-top pairs, which decay to W^+W^-bbbar; events are selected where one W decays hadrons, either e or mu plus neutrino. The data sample corresponds an integrated luminosity approximately 318 pb^-1. A total 165 ttbar separated into four subsamples based on jet transverse energy thresholds number b jets...
We measure the dipion mass spectrum in X(3872)--> J/psipi(+) pi(-) decays using 360 pb(-1) of pp collisions at square root s= 1.96 TeV collected with CDF II detector. The is fit predictions for odd C-parity ((3)S(1), (1)P(1), and (3)D(J)) charmonia decaying to pi(-), as well even states which pions are from rho(0) decay. latter case also encompasses exotic interpretations, such a D(0)D(*0) molecule. Only (3)S(1) J/psirho hypotheses compatible our data. Since untenable on other grounds, decay...
We report the results of a search for charged Higgs boson in decays top quarks produced pp collisions at center-of-mass energy 1.96 TeV. use data sample corresponding to an integrated luminosity 193 pb-1 collected by upgraded Collider Detector Fermilab. No evidence production is found, allowing 95% C.L. upper limits be placed on BR(t-->H+b) different decay scenarios. In addition, we present minimal supersymmetric standard model (mH+/-, tanbeta) plane first exclusion regions with radiative...
We present new limits on exotic keV-scale physics based 478 kg d of Majorana Demonstrator commissioning data. Constraints at the 90% confidence level are derived bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, electron decay using monoenergetic peak signal above our background. Our most stringent DM constraints set for 11.8 keV mass particles, limiting g_{Ae}<4.5×10^{-13} pseudoscalars (α^{'}/α)<9.7×10^{-28} vectors. also report a 14.4...
We report the first evidence for a fully reconstructed decay mode of B±c meson in channel B±c→J/ψπ±, with J/ψ→μ+μ−. The analysis is based on an integrated luminosity 360 pb−1 p¯p collisions at 1.96 TeV center mass energy collected by Collider Detector Fermilab. observe 14.6±4.6 signal events background 7.1±0.9 events, and fit to J/ψπ± spectrum yields 6285.7±5.3(stat)±1.2(syst) MeV/c2. probability peak this magnitude occurring random fluctuation search region estimated as 0.012%.Received 23...
The possible existence of short-range forces between unpolarized and polarized spin-1/2 particles has attracted the attention physicists for decades. These are predicted in various theories provide a new source parity (P) time reversal (T) symmetry violation. We use an ensemble 3He gas cell with 250 um thickness glass window to search force from scalar boson exchange over sub-millimeter ranges. This interaction would produce NMR frequency shift as mass is moved near far ensemble. report...
We propose the construction of LEGEND-1000, ton-scale Large Enriched Germanium Experiment for Neutrinoless $\beta \beta$ Decay. This international experiment is designed to answer one highest priority questions in fundamental physics. It consists 1000 kg Ge detectors enriched more than 90% $^{76}$Ge isotope operated a liquid argon active shield at deep underground laboratory. By combining lowest background levels with best energy resolution field, LEGEND-1000 will perform...
Considerable effort has been made to better understand why some people suffer from severe COVID-19 while others remain asymptomatic. This led important clinical findings; with generally experience persistently high levels of inflammation, slower viral load decay, display a dysregulated type-I interferon response, have less active natural killer cells and increased neutrophil extracellular traps. How these findings are connected the pathogenesis remains unclear. We propose mathematical model...
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough justify building tonne-scale experiment search for the neutrinoless double-beta decay ($\beta\beta(0\nu)$) $^{76}\mathrm{Ge}$. Purpose: This paper presents description instrument, its commissioning, and operations. It covers electroforming, underground infrastructure, enrichment, detector fabrication, low-background...
We present a measurement of the Bc+ meson lifetime in decay mode --> J/Psie+nue using Collider Detector at Fermilab II detector Tevatron Collider. From sample about 360 pb(-1) pp collisions square root s = 1.96 TeV, we reconstruct J/Psie+ pairs with invariant mass kinematically allowed range 4< M(J/Psie) < 6 GeV/c2. A fit to decay-length distribution 238 signal events yields measured 0.463(-0.065)(+0.073)(stat) +/- 0.036(syst) ps.
We present a measurement of the tt¯ production cross section using events with one charged lepton and jets from pp¯ collisions at center-of-mass energy 1.96 TeV. A b-tagging algorithm based on probability displaced tracks coming event interaction vertex is applied to identify b quarks top decay. Using 318 pb−1 data collected CDF II detector, we measure in least restrictive (tight) b-tagged jet obtain 8.9−1.0+1.0(stat)−1.0+1.1(syst) pb. The value assumes quark mass mt=178 GeV/c2 acceptance...
We present a measurement of the top quark pair production cross section in p¯p collisions at √s=1.96 TeV using 318 pb−1 data collected with Collider Detector Fermilab. select t¯t decays into final states eν+jets and μν+jets, which least one b from t-quark is identified secondary vertex-finding algorithm. Assuming mass 178 GeV/c2, we measure 8.7±0.9(stat)+1.1−0.9(syst) pb. also report first observation significance greater than 5σ subsample both quarks are identified, corresponding to...
We search for Z' bosons in dielectron events produced pp collisions at square root of s = 1.96 TeV, using 0.45 fb(-1) data accumulated with the Collider Detector Fermilab II detector Tevatron. To identify --> e+ e- signal, both invariant mass distribution and angular electron pair are used. No evidence a signal is found, 95% confidence level lower limits set on several models. Limits also placed gauge coupling generic Z', as well contact-interaction scales different helicity structure scenarios.
We present a search for neutral supersymmetric Higgs bosons decaying to $\ensuremath{\tau}$ pairs produced in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$. The data, corresponding $310\text{ }{\mathrm{pb}}^{\ensuremath{-}1}$ integrated luminosity, were collected with the Collider Detector Fermilab run II of Tevatron. No significant excess above standard model backgrounds is observed. set exclusion limits on production cross section times branching fraction boson...
The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility Lead, South Dakota, also allows searches new exotic physics. Free, relativistic, lightly ionizing particles with electrical charge less than e are forbidden by standard model but predicted some its extensions. If such exist, they might be detected...
We conducted a search for an exotic spin- and velocity-dependent interaction polarized electrons with experimental approach based on high-sensitivity spin-exchange relaxation-free (SERF) magnetometer, which serves as both source of magnetic-field sensor. The experiment aims to sensitively detect magnetic-fieldlike effects from the between in SERF vapor cell unpolarized nucleons closely located solid-state mass. report results 82 h data averaging, sets limit coupling strength around 10^{-19}...
Ta180m is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to large K-spin differences small energy between isomeric lower-energy states. Detecting its presents significant experimental challenge but could shed light on neutrino-induced nucleosynthesis mechanisms, nature dark matter, violation. For this study, we repurposed Majorana Demonstrator, an search for neutrinoless...