A5084331018- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Magnetic confinement fusion research
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- advanced mathematical theories
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Quantum, superfluid, helium dynamics
- Nuclear physics research studies
- Muon and positron interactions and applications
- Distributed and Parallel Computing Systems
- Black Holes and Theoretical Physics
- Atomic and Molecular Physics
Brookhaven National Laboratory
2014-2024
Massachusetts Institute of Technology
2020-2023
Thomas Jefferson National Accelerator Facility
2016-2023
Institute for Theoretical and Experimental Physics
2014-2019
Trinity College Dublin
2019
Moscow Institute of Physics and Technology
2014
The University of Adelaide
2013
European Organization for Nuclear Research
2012
Universidade de São Paulo
2012
RIKEN BNL Research Center
2012
We present the FP420 R&D project, which has been studying key aspects of development and installation a silicon tracker fast-timing detectors in LHC tunnel at 420 m from interaction points ATLAS CMS experiments. These would measure precisely very forward protons conjunction with corresponding central as means to study Standard Model (SM) physics, search for characterise new physics signals. This report includes detailed description case detector and, particular, measurement Central Exclusive...
A sample of 4 x 10(5) events from the decay K(+)-->pi(+)pi(-)e(+)nu(e) (K(e4)) has been collected in experiment E865 at Brookhaven Alternating Gradient Synchrotron. The analysis these data yields new measurements K(e4) branching ratio [(4.11+/-0.01+/-0.11) 10(-5)], s-wave pi scattering length [a(0)(0) = 0.216+/-0.013(stat)+/-0.004(syst)+/-0.005(theor)], and form factors F, G, H hadronic current their dependence on invariant mass.
We report experimental details and results of a new measurement the decay K+→π+π−e+νe(Ke4). A sample more than 400,000Ke4 events with low background has been collected by Experiment 865 at Brookhaven Alternate Gradient Synchrotron. From these data, branching ratio (4.11±0.01±0.11)×10−5 ππ invariant mass dependence form factors F,G, H weak hadronic current as well phase shift difference δ00−δ11 for scattering were extracted. Using constraints based on analyticity chiral symmetry, value...
A search for lepton flavor violating decays, K+ --> mu+ pi-, e+ pi+ mu-, and pi0 was performed using the data collected in Experiment E865 at Brookhaven Alternating Gradient Synchrotron. No signal found any of decay modes. At 90% confidence level, branching ratios are less than 3.0x10(-9), 6.4x10(-10), 5. 2x10(-10), 5.0x10(-10), 3.4x10(-9), respectively.
E865 at the Brookhaven National Laboratory AGS collected about 70 000 K(+)(e3) events to measure branching ratio relative observed K+-->pi(+)pi(0), K+-->pi(0)micro(+)nu, and K+-->pi(+)pi(0)pi(0) decays. The pi(0) in all decays was detected using e(+)e(-) pair from pi(0)-->e(+)e(-)gamma decay no photons were required. Using 2002 Particle Data Group ratios for normalization decays, we obtain BR(K(+)(e3(gamma)))=(5.13+/-0.02(stat)+/-0.09(syst)+/-0.04(norm))%, where K(+)(e3(gamma)) includes...
A low-background sample of 10 300 events has been collected for the decay mode ${K}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{e}^{+}{e}^{\ensuremath{-}}$ by experiment E865 at Brookhaven Alternating Gradient Synchrotron. The branching ratio is measured to be $[2.94\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.13(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.05(\mathrm{model})]\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$, vector nature this...
At the Relativistic Heavy Ion Collider (RHIC), Polarized Atomic Hydrogen Gas Jet Target polarimeter (HJET) is employed for precise measurement of absolute transverse (vertical) polarization proton beams, achieving low systematic uncertainties approximately σPsyst/P≤0.5%. The acquired experimental data not only facilitated determination single AN(t) and double ANN(t) spin analyzing powers 100 255 GeV but also revealed a non-zero Pomeron spin-flip contribution through Regge fit. Preliminary...
Based on results of a search for the lepton-family-number-violating decay K+→π+μ+e− with data collected by experiment E865 at Alternating Gradient Synchrotron Brookhaven National Laboratory, we place an upper limit branching ratio 2.1×10−11 (90% C.L.). Combining earlier and those previous experiment, E777, 1.3×10−11 C.L.) is obtained.3 MoreReceived 28 January 2005DOI:https://doi.org/10.1103/PhysRevD.72.012005©2005 American Physical Society
Experiment 865 at the Brookhaven Alternating Gradient Synchrotron obtained 410 K+→e+νe+e− and 2679 K+→μ+νe+e− events including 10% 19% background. The branching ratios were measured to be [2.48±0.14(stat)±0.14(syst)]×10−8 (mee>150 MeV) (7.06±0.16±0.26)×10−8 (mee>145 MeV), respectively. Results for decay form factors are presented.Received 5 April 2002DOI:https://doi.org/10.1103/PhysRevLett.89.061803©2002 American Physical Society
More than 400 K+-->pi(+)&mgr;(+)&mgr;(-) events were observed in a rare K+ decay experiment at the Brookhaven Alternating Gradient Synchrotron. Normalized to K+-->pi(+)pi(+)pi(-) decay, branching ratio is determined be [9.22+/-0.60(stat)+/-0. 49(syst)]x10(-8). This and &mgr;&mgr; mass spectrum very good agreement with measurement of K+-->pi(+)e(+)e(-) but deviates significantly from previous measurement.
The Polarized Atomic Hydrogen Gas Jet Target polarimeter is employed by the Relativistic Heavy Ion Collider (RHIC) to measure absolute polarization of each colliding proton beam. Polarimeter detectors and data acquisition were upgraded in 2015 increase solid angle, energy range, resolution. These upgrades advanced systematic error analysis along with improved beam intensity RHIC runs (E_{beam}=100 GeV) 2017 (255 allowed us greatly reduce statistical uncertainties for elastic spin...
We report results of a search for the lepton-family number violating decay K+-->pi(+)&mgr;(+)e(-) from data collected by experiment E865 in 1996 at Alternating Gradient Synchroton Brookhaven National Laboratory. place an upper limit on branching ratio 3.9x10(-11) ( 90% C.L.). Together with based 1995 and earlier experiment, E777, this result establishes combined confidence level 2.8x10(-11). also new pi(0)-->&mgr;(+)e(-) 3.8x10(-10) C. L.).
The requirements for hadron polarimetry at the future Electron-Ion Collider (EIC) include measurements of absolute helion $(^{3}\mathrm{He},h)$ beam polarization with systematic uncertainties better than ${\ensuremath{\sigma}}_{P}^{\text{syst}}/P\ensuremath{\le}1%$. Recently, it was proposed that Polarized Atomic Hydrogen Gas Jet Target (HJET) be utilized precision measurement $\ensuremath{\approx}100\phantom{\rule{4pt}{0ex}}\mathrm{GeV}/n$ beam. At Relativistic Heavy Ion Collider, HJET...