M. C. Sánchez
A5086811361- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Noncommutative and Quantum Gravity Theories
- Planetary Science and Exploration
- Cosmology and Gravitation Theories
- Magnetic Field Sensors Techniques
- Stellar, planetary, and galactic studies
- Quantum, superfluid, helium dynamics
- Non-Destructive Testing Techniques
- Pulsars and Gravitational Waves Research
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Sensor Technology and Measurement Systems
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
Florida State University
2023-2025
Iowa State University
2016-2025
Florida Department of State
2024-2025
Fermi National Accelerator Laboratory
2002-2022
University of California, Berkeley
2009-2022
Argonne National Laboratory
2010-2020
Universidad de Antioquia
2015
Harvard University
2004-2012
Universidade de Santiago de Compostela
2005-2012
Harvard University Press
2005-2011
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 report measurements of oscillation parameters from ν(μ) and disappearance using beam atmospheric data MINOS. The comprise exposures 10.71×10(20) protons on target in the ν(μ)-dominated beam, 3.36×10(20) ν(μ)-enhanced 37.88 kton yr neutrinos. Assuming identical ν parameters, we measure |Δm2| = (2.41(-0.10)(+0.09))×10(-3) eV2 sin2(2θ) 0.950(-0.036)(+0.035). Allowing independent oscillations, antineutrino (2.50(-0.25)(+0.23))×10(-3) 0.97(-0.08)(+0.03), with minimal change to neutrino parameters.
We report on a new analysis of neutrino oscillations in MINOS using the complete set accelerator and atmospheric data. The combines $\nu_{\mu}$ disappearance $\nu_{e}$ appearance data three-flavor formalism. measure $|\Delta m^{2}_{32}|=[2.28-2.46]\times10^{-3}\mbox{\,eV}^{2}$ (68% C.L.) $\sin^{2}\theta_{23}=0.35-0.65$ (90% normal hierarchy, m^{2}_{32}|=[2.32-2.53]\times10^{-3}\mbox{\,eV}^{2}$ $\sin^{2}\theta_{23}=0.34-0.67$ inverted hierarchy. also constrain $\delta_{CP}$, $\theta_{23}$...
We report on ν(e) and appearance in ν(μ) beams using the full MINOS data sample. The comparison of these at a 735 km baseline with θ13 measurements by reactor experiments probes δ, θ23 octant degeneracy, mass hierarchy. This analysis is first use this technique includes accelerator long-baseline search for → ν(e). Our disfavor 31% (5%) three-parameter space defined θ23, hierarchy 68% (90%) C.L. measure value 2sin(2)(2θ13)sin(2)(θ23) that consistent experiments.
A search for mixing between active neutrinos and light sterile has been performed by looking muon neutrino disappearance in two detectors at baselines of 1.04 735 km, using a combined MINOS MINOS+ exposure 16.36×10^{20} protons on target. simultaneous fit to the charged-current neutral-current energy spectra yields no evidence 3+1 model. The most stringent limit date is set parameter sin^{2}θ_{24} values mass splitting Δm_{41}^{2}>10^{-4} eV^{2}.
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...
Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov scintillation signals. Such could reconstruct particle direction species using light while also having excellent energy resolution low threshold of scintillator detector. Situated deep underground, utilizing new techniques computing reconstruction, this achieve unprecedented...
We report results of a search for oscillations involving light sterile neutrino over distances 1.04 and 735 km in ν_{μ}-dominated beam with peak energy 3 GeV. The data, from an exposure 10.56×10^{20} protons on target, are analyzed using phenomenological model one neutrino. constrain the mixing parameters θ_{24} Δm_{41}^{2} set limits four-dimensional Pontecorvo-Maki-Nakagawa-Sakata matrix, |U_{μ4}|^{2} |U_{τ4}|^{2}, under assumption that between ν_{e} ν_{s} is negligible (|U_{e4}|^{2}=0)....
A deficit of atmospheric ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ events, consistent with the hypothesis neutrino oscillations, is observed in 5.90 kiloton-year fiducial exposure Soudan 2 detector. An unbinned maximum likelihood analysis $L/E$ distribution has been carried out using Feldman-Cousins prescription. The probability no oscillation $5.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}.$ 90% confidence allowed region...
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.
Kinematic distributions from an inclusive sample of $1.41\ifmmode\times\else\texttimes\fi{}{10}^{6}$ charged-current ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ interactions on iron, obtained using the MINOS near detector exposed to a wide-band beam with peak flux at 3 GeV, are compared conventional treatment neutrino scattering within Fermi gas nucleus. Results used guide selection subsample enriched in quasielastic ${\ensuremath{\nu}}_{\ensuremath{\mu}}\mathrm{Fe}$ interactions, containing...
We report the final measurement of neutrino oscillation parameters $\mathrm{\ensuremath{\Delta}}{m}_{32}^{2}$ and ${\mathrm{sin}}^{2}{\ensuremath{\theta}}_{23}$ using all data from MINOS $\mathrm{MINOS}+$ experiments. These were collected a total exposure $23.76\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target producing ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}$ beams 60.75 kt yr to atmospheric neutrinos. The disappearance...
Upward-going stopping muons initiated by atmospheric νμ and ν¯μ interactions in the rock below Soudan 2 detector have been isolated, together with a companion sample of neutrino-induced single muons, created within detector, which travel downwards exit. The downward-going is consistent atmospheric-neutrino flux prediction, but upward-going exhibits sizable depletion. Both are previously reported neutrino-oscillation results. Inclusion two samples an all-event likelihood analysis, using...
This paper reports measurements of atmospheric neutrino and antineutrino interactions in the MINOS Far Detector, based on 2553 live-days (37.9 kton-years) data. A total 2072 candidate events are observed. These separated into 905 contained-vertex muons 466 neutrino-induced rock-muons, both produced by charged-current $\nu_{\mu}$ $\bar{\nu}_{\mu}$ interactions, 701 showers, composed mainly $\nu_{e}$ $\bar{\nu}_{e}$ neutral-current interactions. The curvature muon tracks magnetic field...
The recent development of Water-based Liquid Scintillator (WbLS), and the concurrent high-efficiency high-precision-timing light sensors, has opened up possibility for a new kind large-scale detector capable very broad program physics. would include determination neutrino mass hierarchy observation CP violation with long-baseline neutrinos, searches proton decay, ultra-precise solar measurements, geo- supernova neutrinos including diffuse antineutrinos, neutrinoless double beta decay. We...
DAEdALUS, a Decay-At-rest Experiment for delta_CP studies At the Laboratory Underground Science, provides new approach to search CP violation in neutrino sector. The design utilizes low-cost, high-power proton accelerators under development commercial uses. These provide beams with energy up 52 MeV from pion and muon decay-at-rest. experiment searches aninu_mu antinu_e at short baselines corresponding atmospheric Delta m^2 region. will be detected, via inverse beta decay, 300 kton...
We report new constraints on flavor-changing non-standard neutrino interactions from the MINOS experiment, in which versus antineutrino can be distinguished an event-by-event basis. analyzed a combined set of beam and data well-understood NuMI beam, found no evidence for deviations standard mixing. The observed energy spectra constrain parameter to range −0.20<εμτ<0.07(90%C.L.).Received 22 March 2013DOI:https://doi.org/10.1103/PhysRevD.88.072011© 2013 American Physical Society
The R&D mission of the Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is described in detail. ANNIE is: (1) an important measurement neutrino-nucleus interactions focusing specifically on neutron production, and (2) effort focused using new photodetector technology chemical additives to make advanced water-base neutrino detectors. experiment consists a small Water Cherenkov detector, instrumented with both conventional photomultiplier tubes (PMTs) Large Area Picosecond...
Abstract The Accelerator Neutrino Neutron Interaction Experiment (ANNIE) is a 26-ton water Cherenkov neutrino detector installed on the Booster Beam (BNB) at Fermilab. Its main physics goals are to perform measurement of neutron yield from neutrino-nucleus interactions, as well charged-current cross section muon neutrinos. An equally important focus research and development new technologies target media. Specifically, water-based liquid scintillator (WbLS) interest novel medium, it allows...
We have searched for neutron-antineutron oscillations using the 5.56 fiducial kiloton-year exposure of Soudan 2 iron tracking calorimeter. require candidate nn̄ occurrences to >~4 prongs (tracks and showers) kinematics compatible with n̄N annihilation within a nucleus. observe five events, an estimated background from atmospheric neutrino cosmic ray induced events 4.5±1.2 events. Previous experiments smaller exposures observed no candidates, rates similar this experiment. set lifetime lower...
Data on inclusive dielectron production are presented for the reaction p+p at 2.2 GeV measured with High Acceptance DiElectron Spectrometer (HADES). Our results supplement data obtained earlier in this bombarding energy regime by DLS and HADES. The comparison 2.09 is discussed. reconstructed e+e- distributions confronted simulated pair cocktails, revealing an excess yield invariant masses around 0.5 GeV/c2. Inclusive cross sections of neutral pion eta obtained.
A sample of $1.53\ifmmode\times\else\texttimes\fi{}{10}^{9}$ cosmic-ray-induced single muon events has been recorded at 225 m water equivalent using the MINOS near detector. The underground rate is observed to be highly correlated with effective atmospheric temperature. coefficient ${\ensuremath{\alpha}}_{T}$, relating change in vertical temperature, determined $0.428\ifmmode\pm\else\textpm\fi{}0.003(\text{stat}.)\ifmmode\pm\else\textpm\fi{}0.059(\text{syst}.)$. An alternative description...