A5078445366- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Crystallography and molecular interactions
- Computational Physics and Python Applications
- Black Holes and Theoretical Physics
- Electron and X-Ray Spectroscopy Techniques
- Gyrotron and Vacuum Electronics Research
- Photocathodes and Microchannel Plates
- Nuclear physics research studies
- Noncommutative and Quantum Gravity Theories
- Radioactive Decay and Measurement Techniques
Leipzig University
2023-2024
The University of Texas at Austin
2005-2015
Syracuse University
1995-2005
Fermi National Accelerator Laboratory
1993-2002
University of California, Santa Barbara
2000-2002
University of Cincinnati
2000-2001
Yonsei University
2000-2001
California Institute of Technology
1998-2001
Purdue University West Lafayette
1998-2001
Carleton University
2001
We report the results of a search for ${\ensuremath{\nu}}_{e}$ appearance in ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ beam MINOS long-baseline neutrino experiment. With an improved analysis and increased exposure $8.2\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on NuMI target at Fermilab, we find that $2{sin}^{2}({\ensuremath{\theta}}_{23}){sin}^{2}(2{\ensuremath{\theta}}_{13})<0.12(0.20)$ 90% confidence level $\ensuremath{\delta}=0$ normal (inverted) mass hierarchy, with best-fit...
We have measured the branching fraction and photon energy spectrum for radiative penguin process b-->s gamma. find Beta(b-->s gamma) = (3.21+/-0.43+/-0.27(+0.18)(-0.10))x10(-4), where errors are statistical, systematic, from theory corrections. obtain first second moments of above 2.0 GeV, <E( gamma)> 2.346+/-0.032+/-0.011 <E(2)(gamma)>-<E(gamma)>(2) 0.0226+/-0.0066+/-0.0020 GeV(2), statistical systematic. From moment, we (in modified minimal subtraction renormalization scheme, to order...
This Letter reports new results from the MINOS experiment based on a two-year exposure to muon neutrinos Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of neutrino flavor mass splitting |Deltam2| = (2.43+/-0.13) x 10(-3) eV2 (68% C.L.) and mixing angle sin2(2theta) > 0.90 (90% C.L.). disfavor two alternative explanations for disappearance in flight: namely, decays into lighter particles quantum decoherence neutrinos, at 3.7 5.7 standard-deviation levels,...
Measurements of neutrino oscillations using the disappearance muon neutrinos from Fermilab NuMI beam as observed by two MINOS detectors are reported. New analysis methods have been applied to an enlarged data sample exposure 7.25×10(20) protons on target. A fit yields values |Δm(2)|=(2.32(-0.08)(+0.12))×10(-3) eV(2) for atmospheric mass splitting and sin(2)(2θ)>0.90 (90% C.L.) mixing angle. Pure decay quantum decoherence hypotheses excluded at 7 9 standard deviations, respectively.
We report the results of a search for ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance by Main Injector Neutrino Oscillation Search [D. G. Michael et al. (MINOS), Phys. Rev. Lett. 97, 191801 (2006).]. The experiment uses two detectors separated 734 km to observe beam neutrinos created Neutrinos at facility Fermi National Accelerator Laboratory. data were collected in first 282 days operations and correspond an exposure $1.27\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target....
The velocity of a ∼3 GeV neutrino beam is measured by comparing detection times at the near and far detectors MINOS experiment, separated 734 km. A total 473 detector events was used to measure (v−c)/c=5.1±2.9×10−5 (at 68% C.L.). By correlating energies 258 charged-current their arrival detector, limit imposed on mass mν<50 MeV/c2 (99% C.L.).Received 4 June 2007DOI:https://doi.org/10.1103/PhysRevD.76.072005©2007 American Physical Society
Results are reported from a search for active to sterile neutrino oscillations in the MINOS long-baseline experiment, based on observation of neutral-current interactions, an exposure NuMI beam 7.07×1020 protons target. A total 802 event candidates is observed Far Detector, compared expected number 754±28(stat)±37(syst) among three flavors. The fraction fs disappearing νμ that may transition νs found be less than 22% at 90% C.L.Received 19 April...
The energy dependence of the neutrino-iron and antineutrino-iron inclusive charged-current cross sections their ratio have been measured using a high-statistics sample with MINOS Near Detector exposed to NuMI beam from Main Injector at Fermilab. Neutrino antineutrino fluxes were determined low hadronic subsample events. We report measurements neutrino-Fe (antineutrinoFe) section in range 3-50 GeV (5-50 GeV) precision 2-8% (3-9%) which is 2-8%. data set spans region energy, where accurate are...
We present the first measurement of D*+ width using 9/fb e+ e- data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size CESR beam spot to measure energy release distribution from -> D0 pi+ decay. find Gamma(D*+) = 96 +- 4 (Statistical) 22 (Systematic) keV. also in decay compute Delta m m(D*+) - m(D0) 145.412 0.002 0.012 MeV/c^2
We report on a study of the invariant mass spectrum hadronic system in decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}}.$ This was performed with data obtained CLEO II detector operating at CESR ${e}^{+}{e}^{\ensuremath{-}}$ collider. present fits to phenomenological models which resonance parameters associated $\ensuremath{\rho}(770)$ and $\ensuremath{\rho}(1450)$ mesons are...
A search for depletion of the combined flux active neutrino species over a 735 km baseline is reported using neutral-current interaction data recorded by MINOS detectors in NuMI beam. Such not expected according to conventional interpretations oscillation involving three known flavors. would be signature oscillations or decay postulated noninteracting sterile neutrinos, scenarios ruled out existing data. From an exposure 3.18×1020 protons on target which neutrinos energies between ∼500 MeV...
This Letter reports the first direct observation of muon antineutrino disappearance. The MINOS experiment has taken data with an accelerator beam optimized for ν(μ) production, accumulating exposure 1.71 × 10²⁰ protons on target. In Far Detector, 97 charged current events are observed. no-oscillation hypothesis predicts 156 and is excluded at 6.3σ. best fit to oscillation yields |Δm²| = [3.36(-0.40)(+0.46)(stat) ± 0.06(syst)] 10⁻³ eV², sin²(2θ) 0.86(-0.12)(+0.11)(stat) 0.01(syst)....
We report an improved measurement of ν(μ) disappearance over a distance 735 km using the MINOS detectors and Fermilab Main Injector neutrino beam in ν(μ)-enhanced configuration. From total exposure 2.95×10(20) protons on target, which 42% have not been previously analyzed, we make most precise Δm2=[2.62(-0.28)(+0.31)(stat)±0.09(syst)]×10(-3) eV2 constrain mixing angle sin2(2θ)>0.75 (90% C.L.). These values are agreement with Δm2 sin2(2θ) measured for ν(μ), removing tension reported [P....
We have searched for sidereal variations in the rate of antineutrino interactions MINOS Near Detector. Using antineutrinos produced by NuMI beam, we find no statistically significant modulation rate. When this result is placed context Standard Model Extension theory are able to place upper limits on coefficients defining theory. These used combination with results from an earlier analysis neutrino data further constrain coefficients.
We have studied exclusive, radiative B meson decays to charmless mesons in 9.7x10(6) B&Bmacr; accumulated with the CLEO detector. measure B(B0-->K(*0)(892)gamma) = (4.55(+0.72)(-0. 68)+/-0.34)x10(-5) and B(B+-->K(*+)(892)gamma) (3.76(+0.89)(-0. 83)+/-0.28)x10(-5). searched for CP asymmetry B-->K(*)(892)gamma A(CP) +0.08+/-0.13+/-0.03. report first observation of B-->K(*)(2)(1430)gamma a branching fraction (1.66(+0.59)(-0.53)+/-0.13)x10(-5). No evidence B-->rhogamma B0-->omegagamma is found...
We use data collected with the CLEO II detector to perform a high-statistics measurement of resonant substructure in ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ decays. find that Dalitz plot is well represented by combination seven quasi-two-body decay channels...
We present the first measurement of D*(+) width using 9/fb e(+)e(-) data collected near Upsilon(4S) resonance by CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction that takes advantage small vertical size Cornell Electron-positron Storage Ring beam spot to measure energy release distribution from D*(+)-->D(0)pi(+) decay. find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. also in decay compute Delta m identical with m(D*(+))-m(D(0)) 145.412+/-0.002...
Using 13.7 fb(-1) of data recorded by the CLEO detector at Cornell Electron Storage Ring, we investigate spectrum charmed baryons which decay into Lambda+(c)pi(-)pi(+) and are more massive than Lambda+(c)(2625) baryon. We find evidence for two new states: one is broad has an invariant mass roughly 480 MeV above that Lambda+(c) baryon; other narrow with 596+/-1+/-2 mass.
A search for a sidereal modulation in the MINOS near detector neutrino data was performed. If present, this signature could be consequence of Lorentz and CPT violation as predicted by class extensions to Standard Model. No evidence signal set found, implying that there is no significant change propagation depends on direction beam sun-centered inertial frame. Upper limits magnitudes violating terms these Model lie between 0.01-1% maximum expected, assuming suppression signatures factor $10^{-17}$. \
We searched for a sidereal modulation in the MINOS far detector neutrino rate. Such signal would be consequence of Lorentz and CPT violation as described by standard-model extension framework. It also first detection perturbative effect to conventional mass oscillations. found no evidence this signature, upper limits placed on magnitudes violating coefficients describing theory are an improvement factors 20-510 over current best using near detector.
The temperature of the upper atmosphere affects height primary cosmic ray interactions and production high-energy muons which can be detected deep underground. MINOS far detector at Soudan MN, USA, has collected over 67 million induced muons. underground muon rate measured a period five years exhibits 4% peak-to-peak seasonal variation is highly correlated with in atmosphere. coefficient, $\alpha_T$, relating changes to atmospheric was found be: $\alpha_T = 0.874 \pm 0.009$ (stat.) $\pm...
This paper reports results from a search for ${\ensuremath{\nu}}_{\ensuremath{\mu}}\ensuremath{\rightarrow}{\ensuremath{\nu}}_{e}$ transitions by the MINOS experiment based on $7\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target exposure. Our observation of 54 candidate ${\ensuremath{\nu}}_{e}$ events in far detector with background $49.1\ifmmode\pm\else\textpm\fi{}7.0(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}2.7(\mathrm{syst})$ predicted measurements near requires...