Browsing Τμήμα Φυσικής / Department of Physics by Type "Conference Object"
Now showing items 1-20 of 93
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Conference Object
Aspects of string cosmology
(Trieste, SISSA: Proceedings of Science., 2013)We review recent progress in string cosmology, where string dualities are applied so as to obtain complete cosmological evolutions, free of any essential singularities. Two classes of models are analyzed. The first class ...
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Conference Object
Calculation of the decay width of decuplet baryons
(Proceedings of Science (PoS), 2015)We calculate the coupling constant and decay width of the decuplet to octet baryon transitions in lattice QCD using the transfer matrix method. The transition amplitude is related to the coupling constant and via the Fermi's ...
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Conference Object
Characteristics of fiber grating sensors and their relation to manufacturing techniques
(Society of Photo-Optical Instrumentation Engineers, 1995)This work examines the effects of different manufacturing techniques of fiber optic intracore Bragg gratings on their sensing and system parameters. Specifically, we have looked at tolerance with respect to center wavelength, ...
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Conference Object
The chromomagnetic operator on the lattice
(Proceedings of Science (PoS), 2013)We study matrix elements of the "chromomagnetic" operator on the lattice. This operator is contained in the strangeness-changing effective Hamiltonian which describes electroweak effects in the Standard Model and beyond. ...
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Conference Object
Coherence in electron transfer pathways
(2011)Central to the view of electron-transfer reactions is the idea that nuclear motion generates a transition state geometry at which the electron/hole amplitude propagates coherently from the electron donor to the electron ...
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Conference Object
Computation of correlation matrices for tetraquark candidates with Jp = 0+ and flavor structure q1q2q3q3
(Proceedings of Science (PoS), 2015)The conjecture that several recently observed mesons have a structure, which is not dominated by an ordinary quark-Antiquark pair, but by a four-quark structure, is being actively investigated both theoretical and ...
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Conference Object
Computation of disconnected contributions to nucleon observables
(Proceedings of Science (PoS), 2013)We compare several methods for computing disconnected fermion loops contributing to nucleon three-point functions. The comparison is carried out using one ensemble of Nf =2+1+1 twisted mass fermions with pion mass of 373 ...
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Conference Object
Correlation of hot carrier and hot phonon effects in semiconductors on a picosecond time scale
(Publ by Int Soc for Optical Engineering, 1990)Through simultaneous analysis of picosecond, time-resolved reflectivity and Raman scattering data we have been able to self-consistently relate hot carrier and hot phonon kinetics in bulk, crystalline Germanium. We show ...
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Conference Object
Coulomb repulsive correlation in A3B5 semiconductor quantum dots in the presence of a magnetic field
(2006)The ground state total and correlation energies of a negative ion-electron and electron-electron systems in a parabolic QD with standard dispersion law are theoretically investigated in an external magnetic field by a ...
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Conference Object
DDalphaAMG for twisted mass fermions
(Proceedings of Science (PoS), 2016)We present the Adaptive Aggregation-based Domain Decomposition Multigrid method extended to the twisted mass fermion discretization action. We show comparisons of results as a function of tuning the parameters that enter ...
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Conference Object
DEFECTS CHARACTERIZATION OF ARSENIC IMPLANTED SILICON BY AC HALL EFFECT MEASUREMENTS.
(Materials Research Soc, 1986)AC and DC Hall effects measurements as a function of temperature (77-300K) and frequency (1Hz-100KHz) have been performed to characterize implanted Silicon films. This technique enables the determination of the annihilation ...
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Conference Object
Determination of the Δ resonance width from lattice QCD
(Proceedings of Science (PoS), 2013)A method suitable for extracting resonance parameters of unstable baryons in lattice QCD is examined. The method is applied to the strong decay of the Δ to a pion-nucleon state, extracting the pND coupling constant and Δ ...
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Conference Object
Di-pion and di-electron production in NN reactions with HADES at 1.25GeV incident beam energy.
(2013)Significant isospin effects are observed by the HADES collaboration in inclusive dilepton production channels in the pp and quasi free np experiments at 1.25 GeV kinetic beam energy. Triggered by this observation, analyses ...
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Conference Object
Dilepton production in ion-ion collisions studied using HADES
(2007)The High-Acceptance Di-Electron Spectrometer installed at GSI Darmstadt is a second generation experiment to study production of dielectron pairs from proton, pion and nucleus induced reactions at the SIS/BEVALAC energy ...
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Conference Object
Disconnected diagrams with twisted-mass fermions
(Proceedings of Science (PoS), 2016)The latest results from the Twisted-Mass collaboration on disconnected diagrams at the physical value of the pion mass are presented. In particular, we focus on the sigma terms, the axial charges and the momentum fraction, ...
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Conference Object
Disconnected quark loop contributions to nucleon observables using Nf = 2 twisted clover fermions at the physical value of the light quark mass
(Proceedings of Science (PoS), 2015)We compute the disconnected quark loops contributions entering the determination of nucleon observables, by using a Nf = 2 ensemble of twisted mass fermions with a clover term at a pION mass mπ = 133 MeV. We employ exact ...
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Conference Object
Double pion production in np and pp collisions at 1.25 GeV with HADES
(Proceedings of Science (PoS), 2012)The results of double pion production in np and pp collisions at an incident beam energy of 1.25 GeV with the HADES spectrometer at GSI are presented. The np-reactions were studied in d p collisions at 1.25 GeV/u using ...
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Conference Object
The dp-elastic cross section measurement at the deuteron kinetic energy of 2.5 GeV
(2012)New results on the differential cross section in deuteron-proton elastic scattering are obtained at the deuteron kinetic energy of 2.5 GeV with the HADES spectrometer. The angular range of 69° - 125° in the center of mass ...
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Conference Object
Efficient förster transfer mediated by excitons in InGaN/GaN quantum well/polyfluorene heterostructures
(2007)We report on novel InGaN/GaN quantum well/polyfluorene heterostructures where efficient Förster energy transfer from the well to the organic layer occurs. We show that Mott-Wannier excitons dominate the quantum well ...
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Conference Object
The electric dipole moment of the neutron from Nf = 2+1+1 twisted mass fermions
(Proceedings of Science (PoS), 2015)We extract the neutron electric dipole moment (nEDM) dn on configurations produced with Nf = 2+1+1 twisted mass fermions with lattice spacing of a ≃ 0.082fm and a light quark mass that correpsonds to Mπ ≃ 373 MeV. We do ...