European Physical Journal C (EUR PHYS J C )

Publisher: Springer Verlag

Description

The European Physical Journal C Particles and Fields A merger of Il Nuovo Cimento A and Zeitschrift für Physik C The physics of elementary particles lies at the frontier of our understanding of nature. The journal EPJ C publishes most recent experimental and theoretical results obtained in this field. Experimental results come from the high energy physics laboratories such as CERN (Switzerland) DESY (Germany) SLAC and Fermilab (both USA) and KEK (Japan) with their accelerators and experimentral facilities and also from nonaccelerator laboratories such as Kamioka (Japan) Gran-Sasso (Italy) and others. Theoretical topics include studies and tests of the Standard Model computer simulations of Quantum Chromodynamics search for the Higgs particle and supersymmetry and the investigation of new ideas beyond the standard model. Experimental Physics e + e - experiments Lepton nucleon scattering Hadron hadron scattering B physics Neutrino physics Non-accelerator experiments High-energy nuclear reactions Theoretical Physics The standard model: Electroweak interactions and QCD Nonperturbative strong interactions Soft hadron physics Lattice field theory High temperature QCD and heavy ion physics Beyond the standard model Astroparticle physics and cosmology Quantum field theory

  • Impact factor
    5.25
    Show impact factor history
     
    Impact factor
  • 5-year impact
    3.60
  • Cited half-life
    4.00
  • Immediacy index
    2.22
  • Eigenfactor
    0.05
  • Article influence
    1.52
  • Website
    European Physical Journal C (EPJ C), The - Particles and Fields website
  • Other titles
    European physical journal., Particles and fields, EPJ., Eur. phys. j
  • ISSN
    1434-6044
  • OCLC
    39166324
  • Material type
    Document, Periodical, Internet resource
  • Document type
    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

Springer Verlag

  • Pre-print
    • Author can archive a pre-print version
  • Post-print
    • Author can archive a post-print version
  • Conditions
    • Authors own final version only can be archived
    • Publisher's version/PDF cannot be used
    • On author's website or institutional repository
    • On funders designated website/repository after 12 months at the funders request or as a result of legal obligation
    • Published source must be acknowledged
    • Must link to publisher version
    • Set phrase to accompany link to published version (The original publication is available at www.springerlink.com)
    • Articles in some journals can be made Open Access on payment of additional charge
  • Classification
    ​ green

Publications in this journal

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    ABSTRACT: We present a set of formulas to extract two second-order independent differential equations for the gluon and singlet distribution functions. Our results extend from the LO up to NNLO DGLAP evolution equations with respect to the hard-Pomeron behavior at low-x. In this approach, both singlet quarks and gluons have the same high-energy behavior at low-x. We solve the independent DGLAP evolution equations for the functions $F_{2}^{s}(x,Q^{2})$ and G(x,Q 2) as a function of their initial parameterization at the starting scale $Q_{0}^{2}$ . The results not only give striking support to the hard-Pomeron description of the low-x behavior, but give a rather clean test of perturbative QCD showing an increase of the gluon distribution and singlet structure functions as x decreases. We compared our numerical results with the published BDM (Block et al. Phys. Rev. D 77:094003 (2008)) gluon and singlet distributions, starting from their initial values at $Q_{0}^{2}=1\ \mathrm{GeV}^{2}$ .
    European Physical Journal C 02/2014; 73(5).
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    ABSTRACT: We describe the electromagnetic field by the massless limit of a massive vector field in the presence of a Coulomb gauge fixing term. The gauge fixing term ensures that, in the massless limit, the longitudinal mode is removed from the spectrum and only the two transverse modes survive. The system, coupled to a classical conserved current, is quantized in the canonical formalism. The classical field configurations due to time-independent electric charges and currents are represented by coherent states of longitudinal and transverse photons, respectively. The occupation number in these states is finite. In particular, the number of longitudinal photons bound by an electric charge q is given by N=q^2/(16\pi\hbar).
    European Physical Journal C 10/2013; 73(12).
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    ABSTRACT: Numerical Stochastic Perturbation Theory was able to get three- (and even four-) loop results for finite Lattice QCD renormalization constants. More recently, a conceptual and technical framework has been devised to tame finite size effects, which had been reported to be significant for (logarithmically) divergent renormalization constants. In this work we present three-loop results for fermion bilinears in the Lattice QCD regularization defined by tree-level Symanzik improved gauge action and n_f=2 Wilson fermions. We discuss both finite and divergent renormalization constants in the RI'-MOM scheme. Since renormalization conditions are defined in the chiral limit, our results also apply to Twisted Mass QCD, for which non-perturbative computations of the same quantities are available. We emphasize the importance of carefully accounting for both finite lattice space and finite volume effects. In our opinion the latter have in general not attracted the attention they would deserve.
    European Physical Journal C 10/2013; 73(12).
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    ABSTRACT: We discuss the high temperature behavior of retarded thermal loops in static external fields. We employ an analytic continuation of the imaginary time formalism and use a spectral representation of the thermal amplitudes. We show that, to all orders, the leading contributions of static hard thermal loops can be directly obtained by evaluating them at zero external energies and momenta.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: We study the quasinormal modes of the massless scalar field of Park black hole in the Ho\v{r}ava gravity using the third order WKB approximation method and found that black hole is stable against these perturbation. We compare and discuss the results with that of Schwarzschild-de Sitter black hole. Thermodynamic properties of Park black hole are investigated and the thermodynamic behavior of upper mass bound is also studied.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: A Cellular Automaton algorithm has been implemented in three dimensions for automated track reconstruction of neutrino interactions in a Liquid Argon Time Projection Chamber. We present details of the algorithm and characterise its performance on simulated data sets.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: Pilgrim dark energy is an interesting proposal which is based on the conjecture that phantom-like dark energy with strong enough repulsive force can prevent the formation of a black hole. We investigate this conjecture by assuming the apparent and event horizons in non-flat universe and we develop different cosmological parameters. We construct the corresponding equation of state parameter, which indicates that its present values lie in the phantom era of the universe for different ranges of μ (pilgrim dark energy parameter) as well as ξ 2 (interacting parameter). It is interesting to mention here that the pilgrim dark energy with event horizon yields a phantom region for all cases of ξ 2 with μ<0. We also develop the ω Λ – $\omega'_{\varLambda}$ plane and explore the thawing as well as freezing region and ΛCDM limit for these models. The statefinders plane is also constructed, which shows the correspondence with different models such as quintessence and phantom dark energy, ΛCDM and Chaplygin gas. Finally, we investigate the validity of the generalized second law of thermodynamics with event horizon in a flat as well as non-flat universe.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: The scintillation light of liquid argon has been recorded wavelength and time resolved with very good statistics in a wavelength interval ranging from 118 nm through 970 nm. Three different ion beams, protons, sulfur ions and gold ions, were used to excite liquid argon. Only minor differences were observed in the wavelength-spectra obtained with the different incident particles. Light emission in the wavelength range of the third excimer continuum was found to be strongly suppressed in the liquid phase. In time-resolved measurements, the time structure of the scintillation light can be directly attributed to wavelength in our studies, as no wavelength shifter has been used. These measurements confirm that the singlet-to-triplet intensity ratio in the second excimer continuum range is a useful parameter for particle discrimination, which can also be employed in wavelength-integrated measurements as long as the sensitivity of the detector system does not rise steeply for wavelengths longer than 190 nm. Using our values for the singlet-to-triplet ratio down to low energies deposited a discrimination threshold between incident protons and sulfur ions as low as ∼2.5 keV seems possible, which represents the principle limit for the discrimination of these two species in liquid argon.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: We investigate the generalized second law (GSL) and the constraints imposed by it for two types of Friedmann universes. The first one is the Friedmann universe with radiation and a positive cosmological constant, and the second one consists of non-relativistic matter and a positive cosmological constant. The time evolution of the event horizon entropy and the entropy of the contents within the horizon are studied by obtaining the Hubble parameter. It is shown that the GSL constrains the temperature of both the radiation and matter of the Friedmann universe. It is also shown that, even though the net entropy of the radiation (or matter) is decreasing at sufficiently large times as the universe expands, it exhibits an increase during the early times when the universe is decelerating. That is, the entropy of the radiation within the comoving volume is decreasing only when the universe is undergoing an accelerated expansion.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: By employing some modification to the normal NJL model, we discuss the Wigner solution of quark gap equation at finite temperature and chemical potential when the current quark mass m is nonzero. The discovery of the coexistence of the Nambu solution and the Wigner solution at finite temperature and chemical potential beyond the chiral limit is of great importance in the study of the chiral phase transition of QCD. Using the pressure difference between Nambu phase and Wigner phase (or in other words, the bag constant) as an order parameter for chiral phase transition, we draw a possible phase diagram based on our calculations.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: We analyze new-physics contributions to e +e −→W +W − at the TeV energy scale, employing an effective field theory framework. A complete basis of next-to-leading-order operators in the standard-model effective Lagrangian is used, both for the nonlinear and the linear realization of the electroweak sector. The elimination of redundant operators via equations-of-motion constraints is discussed in detail. Polarized cross sections for e +e −→W +W − (on-shell) are computed and the corrections to the standard-model results are given in an expansion for large $s/M^{2}_{W}$ . The dominant relative corrections grow with s and can be fully expressed in terms of modified gauge-fermion couplings. These corrections are interpreted in the context of the Goldstone-boson equivalence theorem. Explicit new-physics models are considered to illustrate the generation and the potential size of the coefficients in the effective Lagrangian. Brief comments are made on the production of W +W − pairs at the LHC.
    European Physical Journal C 10/2013; 73(10).
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    ABSTRACT: We find exact energy eigenvalues and eigenfunctions of the quantum bouncer in the presence of the minimal length uncertainty and the maximal momentum. This form of Generalized (Gravitational) Uncertainty Principle (GUP) agrees with various theories of quantum gravity and predicts a minimal length uncertainty proportional to $\hbar\sqrt{\beta}$ and a maximal momentum proportional to $1/\sqrt{\beta}$, where $\beta$ is the deformation parameter. We also find the semiclassical energy spectrum and discuss the effects of this GUP on the transition rate of the ultra cold neutrons in gravitational spectrometers. Then, based on the Nesvizhevsky's famous experiment, we obtain an upper bound on the dimensionless GUP parameter.
    European Physical Journal C 09/2013; 73(10).

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