L. Goodenough
A5013124094- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- History and Developments in Astronomy
- Advanced X-ray and CT Imaging
- Solar and Space Plasma Dynamics
- Muon and positron interactions and applications
- Astro and Planetary Science
- Quantum, superfluid, helium dynamics
- Gamma-ray bursts and supernovae
- Scientific Research and Discoveries
- High-Energy Particle Collisions Research
- Superconducting and THz Device Technology
- Galaxies: Formation, Evolution, Phenomena
Fermi National Accelerator Laboratory
2023-2024
Argonne National Laboratory
2013-2022
RWTH Aachen University
2014
New York University
2009-2011
We analyze the first two years of data from Fermi Gamma Ray Space Telescope direction inner 10 degrees around Galactic Center with intention constraining, or finding evidence of, annihilating dark matter. find that morphology and spectrum emission between 1.25 is well described by a processes decaying pions produced in cosmic ray collisions gas, inverse Compton scattering electrons both disk bulge Inner Galaxy, along gamma rays known points sources region. The observed within approximately...
We study the gamma rays observed by Fermi Gamma Ray Space Telescope from direction of Galactic Center and find that their angular distribution energy spectrum are well described a dark matter annihilation scenario. In particular, we good fit to data for particles with 25-30 GeV mass, an cross section ~9x10^-26 cm^3/s, distributed cusped halo profile within inner kiloparsec Galaxy. cannot, however, exclude possibility these photons originate astrophysical source or sources similar morphology...
We report results from the first search for νμ→νe transitions by NOvA experiment. In an exposure equivalent to 2.74×1020 protons on target in upgraded NuMI beam at Fermilab, we observe 6 events Far Detector, compared a background expectation of 0.99±0.11(syst) based Near Detector measurement. A secondary analysis observes 11 with 1.07±0.14(syst). The 3.3σ excess observed primary disfavors 0.1π<δCP<0.5π inverted mass hierarchy 90% C.L.Received 19 January...
The Double Chooz experiment presents improved measurements of the neutrino mixing angle θ 13 using data collected in 467.90 live days from a detector positioned at an average distance 1050 m two reactor cores nuclear power plant. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic uncertainties with respect previous publications, whereas efficiency $$ {\overline{\nu}}_e signal has increased. value is measured be sin2 2θ = 0.090 − 0.029 +...
We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, ω[over ˜]_{p}^{'}, anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From ratio...
Multiple lines of evidence indicate an anomalous injection high-energy ${e}^{+}{e}^{\ensuremath{-}}$ in the galactic halo. The recent ${e}^{+}$ fraction spectrum from payload for antimatter matter exploration and light-nuclei astrophysics (PAMELA) shows a sharp rise up to 100 GeV. Fermi gamma-ray space telescope has found significant hardening cosmic-ray above GeV, with break, confirmed by HESS at around 1 TeV. advanced thin ionization calorimeter (ATIC) also detected similar excess, falling...
Results from the PAMELA experiment indicate presence of an excess cosmic ray positrons above 10 GeV. In this paper, we consider possibility that signal is result dark matter annihilations taking place in halo Milky Way. Rather than focusing on a specific particle physics model, take phenomenological approach and variety masses two-body annihilation modes, including ${W}^{+}{W}^{\ensuremath{-}}$, ${Z}^{0}{Z}^{0}$, $b\overline{b}$, ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$,...
This paper reports the first measurement using NOvA detectors of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ disappearance in a beam. The analysis uses 14 kton-equivalent exposure $2.74\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons-on-target from Fermilab NuMI Assuming normal neutrino mass hierarchy, we measure $\mathrm{\ensuremath{\Delta}}{m}_{32}^{2}=({2.52}_{\ensuremath{-}0.18}^{+0.20})\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}\text{ }\text{ }{\mathrm{eV}}^{2}$ and...
The Double Chooz experiment has determined the value of neutrino oscillation parameter $\theta_{13}$ from an analysis inverse beta decay interactions with neutron capture on hydrogen. This uses a three times larger fiducial volume than standard assessment, which is restricted to region doped gadolinium (Gd), yielding exposure 113.1 GW-ton-years. data sample used in this distinct that Gd analysis, and systematic uncertainties are also largely independent, some exceptions, such as reactor flux...
We present details on a new measurement of the muon magnetic anomaly, $a_\mu = (g_\mu -2)/2$. The result is based positive data taken at Fermilab's Muon Campus during 2019 and 2020 accelerator runs. uses $3.1$ GeV$/c$ polarized muons stored in $7.1$-m-radius storage ring with $1.45$ T uniform field. value $ a_{\mu}$ determined from measured difference between spin precession frequency its cyclotron frequency. This normalized to strength field, using Nuclear Magnetic Resonance (NMR). ratio...
Recently published results from the PAMELA experiment have shown conclusive evidence for an excess of positrons at high ( ∼ 10–100 GeV) energies, confirming earlier indications HEAT and AMS-01. Such a signal is generally expected dark matter annihilations. However, hard positron spectrum large amplitude are difficult to achieve in most conventional WIMP models. The absence any associated anti-protons highly constraining on models with hadronic annihilation modes. We revisit proposal, wherein...
Anomalies in direct and indirect detection have motivated models of dark matter consisting a multiplet nearly-degenerate states, coupled by new GeV-scale interaction. We perform careful analysis the thermal freezeout annihilation such scenario. compute range "boost factors" arising from Sommerfeld enhancement local halo for which produce correct relic density, show effect including constraints on saturated cosmic microwave background (CMB). find that boost factors up to ~800 are possible...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \overline{\nu_{\mathrm{e}}} observed via inverse beta decay reaction in which neutron is captured on hydrogen. This based 462.72 live days data, approximately twice as much data previous such analysis, collected with detector positioned at an average distance 1050 m from two cores. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic...
We consider the signals of positrons and electrons from ``exciting'' dark matter annihilation. Because light (${m}_{\ensuremath{\phi}}\ensuremath{\lesssim}1\text{ }\text{ }\mathrm{GeV}$) force carrier $\ensuremath{\phi}$ into which states can annihilate, are generally very boosted, yielding a hard spectrum, in addition to low energy needed for INTEGRAL observations Galactic center. relevance this scenario HEAT, PAMELA, WMAP ``haze,'' focusing on...
We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from Fermilab Muon $g\!-\!2$ Experiment using data collected in 2019 and 2020. have analyzed more than 4 times number positrons decay our previous result 2018 data. The systematic error is reduced by factor 2 due to better running conditions, stable beam, improved knowledge field weighted distribution, $\tilde{\omega}'^{}_p$, anomalous precession frequency corrected for beam dynamics effects,...
The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated reactor-on data. In this analysis, we present a background-model-independent measurement of mixing angle θ13 including 7.53 days reactor-off A global fit observed antineutrino rates for different reactor power conditions is performed, yielding both total rate. are improved significantly data fit, as it provides direct This rate modulation analysis considers candidates...
This article describes the setup and performance of near far detectors in Double Chooz experiment. The electron antineutrinos nuclear power plant were measured two identically designed with different average baselines about 400 m 1050 from reactor cores. Over many years data taking neutrino signals extracted interactions goal measuring a fundamental parameter context oscillation, mixing angle {\theta}13. central part was main detector comprising four cylindrical volumes filled organic...
Double Chooz is unique among modern reactor-based neutrino experiments studying $\bar \nu_e$ disappearance in that data can be collected with all reactors off. In this paper, we present from 7.53 days of reactor-off running. Applying the same selection criteria as used reactor-on oscillation analysis, a measured background rate 1.0$\pm$0.4 events/day obtained. The model for accidentals, cosmogenic $\beta$-$n$-emitting isotopes, fast neutrons cosmic muons, and stopped-$\mu$ decays analysis...
As very high energy ($\ensuremath{\gtrsim}100\text{ }\text{ }\mathrm{GeV}$) gamma rays travel over cosmological distances, their flux is attenuated through interactions with the extragalactic background light. Observations of distant ray sources at energies between $\ensuremath{\sim}200\text{ }\mathrm{GeV}$ and a few TeV by ground-based gamma-ray telescopes such as HESS, however, have motivated possibility that universe more transparent to photons than had been anticipated. One proposed...
The PAMELA and Fermi measurements of the cosmic-ray electron positron spectra have generated much interest over past two years, because they are consistent with a significant component fluxes between 20 GeV 1 TeV being produced through dark matter annihilation or decay. However, since also astrophysical interpretations, message is unclear. In this paper, we point out that can more distinct signal in cosmic rays, charge asymmetry. Such asymmetry result if matter's abundance due to relic...
We propose an evolution of the Mu2e experiment, called Mu2e-II, that would leverage advances in detector technology and utilize increased proton intensity provided by Fermilab PIP-II upgrade to improve sensitivity for neutrinoless muon-to-electron conversion one order magnitude beyond providing deepest probe charged lepton flavor violation foreseeable future. Mu2e-II will use as much infrastructure possible, providing, where required, improvements apparatus accommodate beam cope with...
Much attention has been given to dark matter explanations of the PAMELA positron fraction and Fermi electronic excesses. For those theories with a TeV-scale WIMP annihilating through light force-carrier, associated Sommerfeld enhancement provides natural explanation large boost factor needed explain signals, force-carrier naturally gives rise hard cosmic ray spectra without excess pi0 gamma rays or anti-protons. The annihilation rate, which at low relative velocities v scales as 1/v, relies...
The Double Chooz experiment measures the neutrino mixing angle θ 13 by detecting reactor $$ {\overline{\nu}}_e via inverse beta decay. positron-neutron space and time coincidence allows for a sizable background rejection, nonetheless liquid scintillator detectors would profit from positron/electron discrimination, if feasible in large detector, to suppress remaining background. Standard particle identification, based on dependent profile of photon emission scintillator, can not be used given...