European Physical Journal C (EUR PHYS J C )
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) GranSasso (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 Nonaccelerator experiments Highenergy 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 factor5.25Show impact factor historyImpact factorYear
 5year impact3.60
 Cited halflife4.00
 Immediacy index2.22
 Eigenfactor0.05
 Article influence1.52
 WebsiteEuropean Physical Journal C (EPJ C), The  Particles and Fields website
 Other titlesEuropean physical journal., Particles and fields, EPJ., Eur. phys. j
 ISSN14346044
 OCLC39166324
 Material typeDocument, Periodical, Internet resource
 Document typeInternet Resource, Computer File, Journal / Magazine / Newspaper
Publisher details
 Preprint
 Author can archive a preprint version
 Postprint
 Author can archive a postprint 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
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 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

Article: Decoupling of the DGLAP evolution equations at nexttonexttoleading order (NNLO) at lowx
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ABSTRACT: We present a set of formulas to extract two secondorder 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 hardPomeron behavior at lowx. In this approach, both singlet quarks and gluons have the same highenergy behavior at lowx. 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 hardPomeron description of the lowx 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).  [show abstract] [hide abstract]
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 timeindependent 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).  [show abstract] [hide abstract]
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 threeloop results for fermion bilinears in the Lattice QCD regularization defined by treelevel 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 nonperturbative 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).  [show abstract] [hide abstract]
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).  [show abstract] [hide abstract]
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 Schwarzschildde 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).  [show abstract] [hide abstract]
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).  [show abstract] [hide abstract]
ABSTRACT: Pilgrim dark energy is an interesting proposal which is based on the conjecture that phantomlike 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 nonflat 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 nonflat universe.European Physical Journal C 10/2013; 73(10). 
Article: Ionbeam excitation of liquid argon
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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 wavelengthspectra 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 timeresolved 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 singlettotriplet intensity ratio in the second excimer continuum range is a useful parameter for particle discrimination, which can also be employed in wavelengthintegrated 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 singlettotriplet 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).  [show abstract] [hide abstract]
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 nonrelativistic 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).  [show abstract] [hide abstract]
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).  [show abstract] [hide abstract]
ABSTRACT: We analyze newphysics contributions to e +e −→W +W − at the TeV energy scale, employing an effective field theory framework. A complete basis of nexttoleadingorder operators in the standardmodel effective Lagrangian is used, both for the nonlinear and the linear realization of the electroweak sector. The elimination of redundant operators via equationsofmotion constraints is discussed in detail. Polarized cross sections for e +e −→W +W − (onshell) are computed and the corrections to the standardmodel 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 gaugefermion couplings. These corrections are interpreted in the context of the Goldstoneboson equivalence theorem. Explicit newphysics 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).  [show abstract] [hide abstract]
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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