A5105505358- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- Astrophysics and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Muon and positron interactions and applications
- Nuclear physics research studies
- Astronomy and Astrophysical Research
- advanced mathematical theories
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Digital Radiography and Breast Imaging
- Stellar, planetary, and galactic studies
- Structural Analysis of Composite Materials
University of Arizona
2016-2025
University of California, Santa Cruz
2017-2024
Istanbul University
2024
A. Alikhanyan National Laboratory
2024
Rutherford Appleton Laboratory
2023-2024
Atlas Scientific (United States)
2024
National Tsing Hua University
2020-2023
The University of Adelaide
2013-2023
University of Göttingen
2023
Boğaziçi University
2023
We report the observation of X(3872) in J/psipi(+)pi(-) channel, with J/psi decaying to mu(+)mu(-), pp collisions at sqrt[s]=1.96 TeV. Using approximately 230 pb(-1) data collected Run II D0 detector, we observe 522+/-100 candidates. The mass difference between state and is measured be 774.9+/-3.1(stat)+/-3.0(syst) MeV/c(2). have investigated production decay characteristics find them similar those psi(2S) state.
We report observation of the electroweak production single top quarks in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$ based on $2.3\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected by D0 detector Fermilab Tevatron Collider. Using events containing an isolated electron or muon and missing transverse energy, together with jets originating from fragmentation $b$ quarks, we measure a cross section...
We have used a sample of $\ensuremath{\gamma}+3$ jets events collected by the D0 experiment with an integrated luminosity about $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ to determine fraction double parton scattering (${f}_{\mathrm{DP}}$) in single $p\overline{p}$ collision at $\sqrt{s}=1.96\text{ }\mathrm{TeV}$. The DP and effective cross section (${\ensuremath{\sigma}}_{\mathrm{eff}}$), process-independent scale parameter related density inside nucleon, are measured three...
We report the first evidence of charmless semileptonic decays B mesons. In momentum interval 2.4–2.6 GeV/c where background from b→clν is negligible, average measured b→ueν and b→uμν partial branching ratios ΔBub(2.4,2.6) =(1.8±0.4±0.3)×10−4. Inclusion data 2.2–2.4 GeV/c, lepton yield dominated by b→clν, gives ΔBub(2.2,2.6) =(3.3±0.8±0.8)×10−4. ‖Vub/Vcb‖ depends on theoretical model b→ulν decay approximately 0.1.Received 8 November 1989DOI:https://doi.org/10.1103/PhysRevLett.64.16©1990...
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,...
We present a search for charged Higgs bosons in top quark decays. analyze the \eplus, \muplus, $ee$, $eμ$, $μμ$, \etau and \mutau final states from pair production events, using data about 1${\text{fb}}^{-1}$ of integrated luminosity recorded by \dzero experiment at Fermilab Tevatron Collider. consider different scenarios possible boson decays, one where decays purely hadronically into charm strange quark, another it $τ$ lepton neutrino third both appear. extract limits on branching ratio...
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...
We have measured ${B}^{0}$B${\ifmmode\bar\else\textasciimacron\fi{}}^{0}$ mixing by observing like-sign dilepton events in \ensuremath{\Upsilon}(4S) decay. Assuming that the semileptonic branching fractions of charged and neutral B mesons are equal decays to ${B}^{+}$${B}^{\mathrm{\ensuremath{-}}}$ 55% time 45% time, we measure parameter r be 0.19\ifmmode\pm\else\textpm\fi{}0.06\ifmmode\pm\else\textpm\fi{}0.06, where first error is statistical second systematic.
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:...
We combine measurements of the top quark pair production cross section in p¯p collisions ℓ+jets, ℓℓ, and τℓ final states (where ℓ is an electron or muon) at a center mass energy √s=1.96 TeV 1 fb−1 data collected with D0 detector. For 170 GeV/c2, we obtain σt¯t=8.18+0.98−0.87 pb agreement theoretical prediction. Based on predictions from higher order quantum chromodynamics, extract for combined t¯t section, consistent world average mass. In addition, ratios sections different are used to set...
We present the first measurement of dijet angular distributions in pp collisions at square root(s) = 1.96 TeV Fermilab Tevatron Collider. The is based on a dataset corresponding to an integrated luminosity 0.7 fb(-1) collected with D0 detector. Dijet have been measured over range masses, from 0.25 above 1.1 TeV. data are good agreement predictions perturbative QCD and used constrain new physics models including quark compositeness, large extra dimensions, TeV(-1) scale dimensions. For all...
We present a measurement of the $W$ boson mass in $W\ensuremath{\rightarrow}e\ensuremath{\nu}$ decays using $1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected with D0 detector during Run II Fermilab Tevatron collider. With sample 499830 candidate events, we measure ${M}_{W}=80.401\ifmmode\pm\else\textpm\fi{}0.043\text{ }\mathrm{GeV}$. This is most precise from single experiment.
Fermilab experiment E773 has measured the phases ${\ensuremath{\Phi}}_{+\ensuremath{-}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}43.53}^{\ensuremath{\circ}}\ifmmode\pm\else\textpm\fi{}{0.97}^{\ensuremath{\circ}}$ and ${\ensuremath{\Phi}}_{00}\ensuremath{-}{\ensuremath{\Phi}}_{+\ensuremath{-}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.62}^{\ensuremath{\circ}}\ifmmode\pm\else\textpm\fi{}{1.03}^{\ensuremath{\circ}}$ of $\mathrm{CP}$ violating parameters...
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 report the observation of doubly strange b baryon Ω−b in decay channel Ω−b→J/ψΩ−, with J/ψ→μ+μ− and Ω−→ΛK−→(pπ−)K−, p¯p collisions at √s=1.96 TeV. Using approximately 1.3 fb−1 data collected D0 detector Fermilab Tevatron Collider, we observe 17.8±4.9(stat)±0.8(syst) signal events a mass 6.165±0.010(stat)±0.013(syst) GeV. The significance observed is 5.4σ, corresponding to probability 6.7×10−8 it arising from background fluctuation.Received 29 August...
We determine the strong coupling constant ${\ensuremath{\alpha}}_{s}$ and its energy dependence from ${p}_{T}$ of inclusive jet cross section in $p\overline{p}$ collisions at $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$. The is determined over transverse momentum range $50<{p}_{T}<145\text{ }\mathrm{GeV}$. Using perturbative QCD calculations to order $\mathcal{O}({\ensuremath{\alpha}}_{s}^{3})$ combined with $\mathcal{O}({\ensuremath{\alpha}}_{s}^{4})$ contributions threshold corrections, we...
We present a measurement of the electron charge asymmetry in $p\overline{p}\ensuremath{\rightarrow}W+X\ensuremath{\rightarrow}e\ensuremath{\nu}+X$ events at center mass energy 1.96 TeV using $0.75\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data collected with D0 detector Fermilab Tevatron Collider. The is measured as function transverse momentum and pseudorapidity interval ($\ensuremath{-}3.2$, 3.2) compared expectations from next-to-leading order calculations perturbative quantum...
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 search for long-lived charged massive particles using $1.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected by the D0 detector at Fermilab Tevatron $p\overline{p}$ Collider. Time-of-flight information is used to pair produced tau sleptons, gauginolike charginos, and Higgsino-like charginos. find no evidence a signal set 95% C.L. cross section upper limits staus, which vary from 0.31 0.04 pb stau masses between 60 300 GeV. also lower mass 206 GeV (171 GeV) gauginos (Higgsinos).
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 $1.5\ifmmode\times\else\texttimes\fi{}{10}^{6}$...
A search for pair production of doubly-charged Higgs bosons in the process p pbar to H++H-- mu+mu+mu-mu- is performed with D0 Run II detector at Fermilab Tevatron. The analysis based on a sample inclusive di-muon data collected an energy sqrt{s}=1.96 TeV, corresponding integrated luminosity 113 pb-1. In absence signal, 95 % confidence level mass limits M(H++L)>118.4 GeV/c2 and M(H++R)>98.2 are set left-handed right-handed bosons, respectively, assuming 100% branching into muon pairs.