M. Worcester
A5107944396- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Scientific Research and Discoveries
- Mass Spectrometry Techniques and Applications
- Radioactivity and Radon Measurements
- Black Holes and Theoretical Physics
- Lipid Membrane Structure and Behavior
- Nuclear physics research studies
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Radioactive contamination and transfer
Brookhaven National Laboratory
2013-2024
Brookhaven College
2018-2024
Central China Normal University
2024
Fermi National Accelerator Laboratory
2007-2023
University of Alabama
2023
McGill University
2021
European Organization for Nuclear Research
2021
University of Chicago
2007-2013
Délégation Provence et Corse
2006-2011
Campbell Collaboration
2011
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...
We present an analysis of the discovery reach for supersymmetric particles at upgraded Tevatron collider, assuming that SUSY breaking results in universal soft parameters grand unification scale, and lightest particle is stable neutral. first a review literature, including issues unification, renormalization group evolution supersymmetry effect radiative corrections on effective low energy couplings masses theory. consider experimental bounds coming from direct searches those arising...
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...
The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where X(0) is possible new neutral boson that was reported by HyperCP with mass of (214.3 ± 0.5) MeV/c(2). We find no evidence either decay. obtain upper limits Br(K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-)) < 1.0 × 10(-10) Br(K(L)→π(0)π(0)μ(+)μ(-)) 9.2 10(-11) at 90% confidence level. This result rules out pseudoscalar as an explanation under scenario dsX(0) coupling...
As a prototype of Deep Underground Neutrino Experiment far detector, ProtoDUNE single-phase liquid argon Time Projection Chamber will sit in H4 beam line at CERN to study detector response particles. It consists 6 full-size Anode Plane Assemblies (APAs) plus 2 Cathode (CPAs) form two 3.6m drift regions with total 15,360 readout channels. To achieve optimal noise performance, electronics developed for extremely low temperatures (77K-89K) operation has been studied an integral design concept...
The ICARUS T600 liquid argon (LAr) time projection chamber (TPC) underwent a major overhaul at CERN in 2016–2017 to prepare for the operation FNAL Short Baseline Neutrino (SBN) program. This included upgrade of photo-multiplier system and TPC wire read-out electronics. full electronics together with new biasing interconnection scheme are described. design signal feed-through flange is also fundamental piece this whose feature integration all components onto flange. Initial functionality...
In this paper the KTeV collaboration reports analysis of 112.1×103 candidate KL→π+π−γ decays including a background 671±41 events with objective determining photon production mechanisms intrinsic to decay process. These have been analyzed extract relative contributions CP violating bremsstrahlung process and conserving M1 E1 direct emission processes. The amplitude its associated vector form factor parameterized as |g˜M1|(1+a1/a2(Mρ2−MK2)+2MKEγ) measured be...
ProtoDUNE-SP and SBND are both liquid argon (LAr) TPCs for neutrino experiments, they share many common development of cold electronics system. Cold decouples the electrode cryostat design from readout design. With front-end (FE) integrated with detector electrodes, noise is independent fiducial volume (signal cable lengths), much lower than warm electronics. mainly consists 960 FE ASICs, ADC ASICs 120 FPGAs to form Front End Mother Board (FEMB) assemblies. Each FEMB assembly made up an...
Liquid argon time projection chamber technology is an attractive choice for large neutrino detectors, as it provides a high-resolution active target and expected to be scalable very masses. Consequently, has been chosen the first module of DUNE far detector. However, fiducial mass required "far detectors" next generation oscillation experiments exceeds what demonstrated so far. Scaling this larger mass, well requirement underground construction places number additional constraints on design....
We report on a new measurement of the branching ratio B(KL→π0e+e−γ) using KTeV detector. This analysis uses full data set collected from 1997 to 2000. reconstruct 139 events over background 14, which results in B(KL→π0e+e−γ)=(1.62±0.14stat±0.09syst)×10−8. result supersedes earlier this ratio.Received 27 June 2007DOI:https://doi.org/10.1103/PhysRevD.76.052001©2007 American Physical Society
The polarization of neutral Cascade and anti-Cascade hyperons produced by 800 GeV/c protons on a BeO target at fixed targeting angle 4.8 mrad is measured the KTeV experiment Fermilab. Our result 9.7% for shows no significant energy dependence when compared to obtained 400 production twice our angle. first time found be consistent with zero. We also examine transverse momentum.
The 35-ton prototype for the Deep Underground Neutrino Experiment far detector was a single-phase liquid argon time projection chamber with an integrated photon system, all situated inside membrane cryostat. took cosmic-ray data six weeks during period of February 1, 2016 to March 12, 2016. performance detection system checked these data. An installed demonstrated measure arrival times muons resolution better than 32 ns, limited by timing trigger system. A measurement using closely-spaced...
In this paper the KTeV collaboration reports analysis of 112.1*10^3 candidate KL->pi+pi-gamma decays including a background 671+/-41 events with objective determining photon production mechanisms intrinsic to decay process. These have been analyzed extract relative contributions CP violating bremsstrahlung process and conserving M1 E1 direct emission processes. The amplitude its associated vector form factor parameterized as |g_M1|(1+ (a_1/a_2)/(M(rho)^2-M(K)^2+2M(K)*E(gamma)) measured be...
The xi0 muon semileptonic decay has been observed for the first time with nine identified events using KTeV beam line and detector at Fermilab. is normalized to beta mode yields a value ratio of rates gamma(xi0 --> sigma+ mu- nu(mu))/gamma(xi0 e- nu(e)) [1.8(-0.5)(+0.7)(stat) +/- 0.2(syst)] x 10(-2). This in agreement SU(3) flavor symmetric quark model.
This Letter is the first report of KL→π±e∓νe+e− decay. Based on 19 208±144 events, we determine branching fraction, B(KL→π±e∓νe+e−;Me+e−>5 MeV/c2,E∗e+e−>30 MeV)=(1.285±0.041)×10−5, and Γ(Ke3ee;Me+e−>5 MeV/c2)/Γ(Ke3)=[4.57±0.04(stat)±0.14(syst)]×10−5. ratio agrees with a theoretical prediction based chiral perturbation theory (ChPT) calculated to O(p4). The measured kinematical distributions agree those predicted by just ChPT O(p4), but show significant disagreement ones leading-order...
The ProtoDUNE-SP detector is a large-scale prototype of the Single-Phase (SP) Liquid Argon Time Projection Chamber (LArTPC) design proposed for Deep Underground Neutrino Experiment (DUNE). 15,360 LArTPC wires are instrumented with low electronic noise pre-amplifier and digitization ASICs integrated into Front End Motherboards (FEMBs) operating at cryogenic temperature within cryostat. large number electronics channels high performance specifications required production quality control...
The KTeV E799 experiment has conducted a search for the rare decay ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}^{0}\ensuremath{\gamma}$ via topology ${K}_{L}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}{\ensuremath{\pi}}_{D}^{0}\ensuremath{\gamma}$ (where ${\ensuremath{\pi}}_{D}^{0}\ensuremath{\rightarrow}\ensuremath{\gamma}{e}^{+}{e}^{\ensuremath{-}}$). Because of Bose statistics ${\ensuremath{\pi}}^{0}$ pair and real nature photon, is restricted to proceed at...
This Letter is the first report of K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M_{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=[4.57+/-0.04(stat)+/-0.14(syst)]x10{-5}. ratio agrees with a theoretical prediction based chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree those...
We propose a like-sign dilepton search for chargino-neutralino production in p-pbar collisions at sqrt(s) = 1.8 TeV, which complements the previously published trilepton by CDF detector using Fermilab Run I data. Monte Carlo predictions signal and background efficiencies indicate significant increase sensitivity to compared traditional analysis alone.