Browsing Τμήμα Φυσικής / Department of Physics by Title
Now showing items 1394-1411 of 1411
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Article
Zn3N2nanowires: Growth, properties and oxidation
(2013)Zinc nitride (Zn3N2) nanowires (NWs) with diameters of 50 to 100 nm and a cubic crystal structure have been grown on 1 nm Au/Al2O3via the reaction of Zn with NH3including H2between 500°C and 600°C. These exhibited an optical ...
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Article
αs from the non-perturbatively renormalised lattice three-gluon vertex
(1997)We compute the running QCD coupling on the lattice by evaluating two-point and three-point off-shell gluon Green's functions in a fixed gauge and imposing non-perturbative renormalisation conditions on them. Our exploratory ...
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Article
γN → Δ transition form factors in Quenched and NF = 2 QCD
(2004)Calculations of the magnetic dipole, electric quadrupole and Coulomb quadrupole amplitudes for the transition γN → Δ are presented both in quenched QCD and with two flavours of degenerate dynamical quarks. © 2004 Published ...
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Article
Δ(1232) axial charge and form factors from lattice QCD
(2011)We present the first calculation on the Δ axial vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial ...
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Article
Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI
(2017)We report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e- and ppe+e-γ have been studied and ...
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Article
Δ-baryon electromagnetic form factors in lattice QCD
(2009)We develop techniques to calculate the four Δ electromagnetic form factors using lattice QCD, with particular emphasis on the subdominant electric quadrupole form factor that probes deformation of the Δ. Results are presented ...
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Conference Object
θ Dependence of 4D SU(N) gauge theories at finite temperature
(Proceedings of Science (PoS), 2013)We report a study of the dependence of 4D SU(N) gauge theories on the topological θ term at finite temperature, and in particular in the large-N limit. We show that theθ dependence drastically changes across the deconfinement ...
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Article
θ dependence of S U (N) gauge theories in the presence of a topological term
(2009)We review results concerning the θ dependence of 4D S U (N) gauge theories and QCD, where θ is the coefficient of the CP-violating topological term in the Lagrangian. In particular, we discuss θ dependence in the large-N ...
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Article
θ dependence of SU (N) gauge theories
(2002)We study the θ dependence of four-dimensional SU(N) gauge theories, for N ≥ 3 and in the large-N limit. We use numerical simulations of the Wilson lattice formulation of gauge theories to compute the first few terms of the ...
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Article
θ Dependence of the spectrum of SU(N) gauge theories
(2006)We study the θ dependence of the spectrum of four-dimensional SU(N) gauge theories, where θ is the coefficient of the topological term in the Lagrangian, for N 3 and in the large-N limit. We compute the O(θ2) terms of the ...
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Article
Λ-p femtoscopy in collisions of Ar+KCl at 1.76AGeV
(2010)Results on Λp femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76AGeV, the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and ...
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Article
Λ-parameter of lattice QCD with Symanzik improved gluon actions
(2007)We compute the ratio ΛL/ΛMS̄, where the scale parameter ΛL is associated with a lattice formulation of QCD. We consider a 3-parameter family of gluon actions, which are most frequently used for O(a) improvement à la Symanzik. ...
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Article
λ-parameter of lattice QCD with the overlap-Dirac operator
(2000)We compute the ratio ΛL/Λ/MS between the scale parameter ΛL, associated with a lattice formulation of QCD using the overlap-Dirac operator, and Λ/MS of the MS renormalization scheme. To this end, the necessary one-loop ...
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Article
Λp interaction studied via femtoscopy in p + Nb reactions at s NN =3.18 GeV
(2016)We report on the first measurement of pΛ and pp correlations via the femtoscopy method in p + Nb reactions at sNN=3.18GeV, studied with the High Acceptance Di-Electron Spectrometer (HADES). By comparing the experimental ...
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Article
The μτ and eτ decays of top quark pairs produced in pp̄ collisions at √s = 1.8 TeV
(1997)We present a search for dilepton events from tt̄ production with one electron or muon and one hadronically decaying τ lepton from the decay tt̄ → (ℓνℓ)(τντ)bb̄, (ℓ = e, μ), using the Collider Detector at Fermilab. In a 109 ...
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Book
Ταξίδι στη μεγάλη αρχέγονη έκρηξη (Big Bang) η εξέλιξη του σύμπαντος υπό το φώς της πυρηνικής και σωματιδιακής φυσικής
([Εργαστήριο Πυρηνικής Φυσικής. Πανεπιστήμιο Κύπρου], 2002)
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Book
Το κενό που κοχλάζει το κενό ως έννοια δυναμική στον σύγχρονο πολιτισμό
(Δίαυλος, 1999)
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Article
φ decay: A relevant source for K- production at energies available at the GSI schwerionen-synchrotron (SIS)?
(2009)We present phase space distributions and multiplicities of K+, K-, and φ mesons produced in Ar+KCl reactions at a kinetic beam energy of 1.756 GeV/nucleon and measured with the HADES spectrometer. The inverse slope parameters ...