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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Isolating top contributions in the production of the 750 GeV diphoton excess
Recently, both ATLAS and CMS collaborations report an excess at 750GeV in the diphoton invariant mass spectrum at 13TeV LHC. If it is a new scalar produced via loop induced gluon-gluon fusion process, it is important to know what is the particle in the loop. In this work, we investigate the possibility of determine the fraction of the contribution from the standard model top-quark in the loop.
Observation of e + e − → η ′ J / ψ at center-of-mass energies between 4.189 and 4.600 GeV
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S U ( 6 ) GUT origin of the TeV-scale vectorlike particles associated with the 750 GeV diphoton resonance
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Cross sections for ν μ and ν ¯ μ induced pion production on hydrocarbon in the few-GeV region using MINERvA
Separate samples of charged-current pion production events representing two semi-inclusive channels ν μ –CC(π + ) and ν¯ μ –CC(π 0 ) have been obtained using neutrino and antineutrino exposures of the MINERvA detector. Distributions in kinematic variables based upon μ±-track reconstructions are analyzed and compared for the two samples. The differential cross sections for muon production angle, muon momentum, and four-momentum transfer Q 2 are reported, and cross sections versus neutrino energy are obtained. Comparisons with predictions of current neutrino event generators are used to clarify the role of the Δ(1232) and higher-mass baryon resonances in CC pion production and to show the importance of pion final-state interactions. For the ν μ –CC(π + ) [ν¯ μ –CC(π 0 )] sample, the absolute data rate is observed to lie below (above) the predictions of some of the event generators by amounts that are typically 1-to- 2σ. Furthermore, the generators are able to reproduce the shapes of the differential cross sections for all kinematic variables of either data set.
Coherent photon scattering background in sub- GeV / c 2 direct dark matter searches
Here, proposed dark matter detectors with eV-scale sensitivities will detect a large background of atomic (nuclear) recoils from coherent photon scattering of MeV-scale photons. This background climbs steeply below ~10 eV, far exceeding the declining rate of low-energy Compton recoils. The upcoming generation of dark matter detectors will not be limited by this background, but further development of eV-scale and sub-eV detectors will require strategies, including the use of low nuclear mass target materials, to maximize dark matter sensitivity while minimizing the coherent photon scattering background.
Detection of sub-GeV dark matter and solar neutrinos via chemical-bond breaking
Here we explore a new low-threshold direct-detection concept for dark matter, based on the breaking of chemical bonds between atoms. This includes the dissociation of molecules and the creation of defects in a lattice. With thresholds of a few to 10s of eV, such an experiment could probe the nuclear couplings of dark matter particles as light as a few MeV. We calculate the expected rates for dark matter to break apart diatomic molecules, which we take as a case study for more general systems. We briefly mention ideas for how chemical-bond breaking might be detected in practice. We also discuss the possibility of detecting solar neutrinos, including pp neutrinos, with this experimental concept. With an event rate of $\mathscr{O}$(0.1/kg-year), large exposures are required, but measuring low-energy solar neutrinos would provide a crucial test of the solar model.
New constraints and prospects for sub-GeV dark matter scattering off electrons in xenon
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Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s = 500 GeV
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Observation of e + e − → ϕ χ c 1 and ϕ χ c 2 at s = 4.600 GeV
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Measurement of e + e − → π 0 π 0 ψ ( 3686 ) at s from 4.009 to 4.600 GeV and observation of a neutral charmoniumlike structure
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Measurement of the muon antineutrino double-differential cross section for quasielastic-like scattering on hydrocarbon at E ν ∼ 3.5 GeV
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Measurement of e + e − → K K ¯ J / ψ cross sections at center-of-mass energies from 4.189 to 4.600 GeV
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