European Physical Journal C (EUR PHYS J C)

Publisher: Springer Verlag (Germany)

Journal 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 Rankings

2016 Impact Factor Available summer 2017 5.084 5.436 5.247 3.631 3.248 2.746 2.805 3.255 3.251 3.209 3.486 3.58 6.162 5.194 5.408 6.872

Impact factor over time

Impact factor
.
Year

5-year impact 4.12 4.20 1.43 0.05 1.54 European Physical Journal C (EPJ C), The - Particles and Fields website European physical journal., Particles and fields, EPJ., Eur. phys. j 1434-6044 39166324 Document, Periodical, Internet resource Internet Resource, Computer File, Journal / Magazine / Newspaper

Publisher details

• Pre-print
• Author can archive a pre-print version
• Post-print
• Author can archive a post-print version
• Conditions
• On open access repositories
• Published source must be acknowledged
• Publisher's version/PDF may be used
• Applies to Journal of High Energy Physics and European Physical Journal C: Particles and Fields
• All titles are open access journals
• Titles are funded by SCOAP3
• This policy is an exception to the default policies of 'Springer Verlag (Germany)'
• Classification
green

Publications in this journal

• Article: Production of $$a_1$$ a 1 in heavy meson decays
[Hide abstract]
ABSTRACT: In this work, we study various decays of heavy B / D mesons into the $$a_1(1260)$$, based on the form factors derived in different nonperturbative or factorization approaches. These decay modes are helpful to explore the dynamics in the heavy to light transitions. Meanwhile they can also provide insights to a newly discovered state, the $$a_1(1420)$$ with $$I^G(J^{PC})= 1^-(1^{++})$$ observed in the $$\pi ^+ f_0(980)$$ final state in the $$\pi ^-p\rightarrow \pi ^+\pi ^-\pi ^- p$$ process. Available theoretical explanations include tetraquark or rescattering effects due to $$a_1(1260)$$ decays. If the $$a_1(1420)$$ were induced by the rescattering, its production rates are completely determined by those of the $$a_1(1260)$$. Our numerical results for decays into the $$a_1(1260)$$ indicate that there is a promising prospect to study these decays on experiments including BES-III, LHCb, Babar, Belle, and CLEO-c, the forthcoming Super-KEKB factory and the under-design Circular Electron–Positron Collider.
No preview · Article · Feb 2016 · European Physical Journal C
• Article: Search for single top-quark production via flavour-changing neutral currents at 8 TeV with the ATLAS detector
G. Aad · B. Abbott · J. Abdallah · O. Abdinov · R. Aben · M. Abolins · O. S. AbouZeid · H. Abramowicz · H. Abreu · R. Abreu · [...] · S. Zimmermann · Z. Zinonos · M. Zinser · M. Ziolkowski · L. Živković · G. Zobernig · A. Zoccoli · M. zur Nedden · G. Zurzolo · L. Zwalinski ·

No preview · Article · Feb 2016 · European Physical Journal C
• Article: Anomalies in B-decays and U(2) flavor symmetry

No preview · Article · Feb 2016 · European Physical Journal C
• Article: Traces of Lorentz symmetry breaking in a Hydrogen atom at ground state
[Hide abstract]
ABSTRACT: Some traces of a specific Lorentz symmetry breaking scenario in the ground state of the Hydrogen atom are investigated. It is used standard Rayleigh-Schr\"odinger perturbation theory in order to obtain the corrections to the the ground state energy and wave function. It is shown that an induced four-pole moment arises, due to the Lorentz symmetry breaking. The model considered is the one studied in reference Eur. Phys. J. C {\bf 74}, 2937 (2014), where the Lorentz symmetry is broken in the electromagnetic sector.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Measurements of the Higgs boson production and decay rates and coupling strengths using pp collision data at $$\sqrt{s}=7$$ s = 7 and 8 TeV in the ATLAS experiment
[Hide abstract]
ABSTRACT: Combined analyses of the Higgs boson production and decay rates as well as its coupling strengths to vector bosons and fermions are presented. The combinations include the results of the analyses of the $$H\rightarrow \gamma \gamma ,\, ZZ^*,\, WW^*,\, Z\gamma ,\, b\bar{b},\, \tau \tau$$ and $$\mu \mu$$ decay modes, and the constraints on the associated production with a pair of top quarks and on the off-shell coupling strengths of the Higgs boson. The results are based on the LHC proton-proton collision datasets, with integrated luminosities of up to 4.7 $$\mathrm {fb}^{-1}$$ at $$\sqrt{s}=7$$ TeV and 20.3 $$\mathrm {fb}^{-1}$$ at $$\sqrt{s}=8$$ TeV, recorded by the ATLAS detector in 2011 and 2012. Combining all production modes and decay channels, the measured signal yield, normalised to the Standard Model expectation, is $$1.18^{+0.15}_{-0.14}$$. The observed Higgs boson production and decay rates are interpreted in a leading-order coupling framework, exploring a wide range of benchmark coupling models both with and without assumptions on the Higgs boson width and on the Standard Model particle content in loop processes. The data are found to be compatible with the Standard Model expectations for a Higgs boson at a mass of 125.36 GeV for all models considered.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Searches for scalar leptoquarks in pp collisions at $$\varvec{\sqrt{s}}$$ s = 8 TeV with the ATLAS detector
[Hide abstract]
ABSTRACT: Searches for pair-produced scalar leptoquarks are performed using 20 fb$$^{-1}$$ of proton–proton collision data provided by the LHC and recorded by the ATLAS detector at $$\sqrt{s}=8$$ TeV. Events with two electrons (muons) and two or more jets in the final state are used to search for first (second)-generation leptoquarks. The results from two previously published ATLAS analyses are interpreted in terms of third-generation leptoquarks decaying to $$b\nu _{\tau }\bar{b}\bar{\nu _{\tau }}$$ and $$t\nu _{\tau }\bar{t}\bar{\nu _{\tau }}$$ final states. No statistically significant excess above the Standard Model expectation is observed in any channel and scalar leptoquarks are excluded at 95 % CL with masses up to $$m_{\mathrm {LQ1}}<$$ 1050 GeV for first-generation leptoquarks, $$m_{\mathrm {LQ2}}<$$ 1000 GeV for second-generation leptoquarks, $$m_{\mathrm {LQ3}}<$$ 625 GeV for third-generation leptoquarks in the $$b\nu _{\tau }\bar{b}\bar{\nu _{\tau }}$$ channel, and 200 $$< m_{\mathrm {LQ3}}<$$ 640 GeV in the $$t\nu _{\tau }\bar{t}\bar{\nu _{\tau }}$$ channel.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Measurements of fiducial cross-sections for $$t\bar{t}$$ t t ¯ production with one or two additional b-jets in pp collisions at $$\sqrt{s}$$ s =8 TeV using the ATLAS detector
[Hide abstract]
ABSTRACT: Fiducial cross-sections for $$t\bar{t}$$ production with one or two additional b-jets are reported, using an integrated luminosity of 20.3 fb$$^{-1}$$ of proton–proton collisions at a centre-of-mass energy of 8 TeV at the Large Hadron Collider, collected with the ATLAS detector. The cross-section times branching ratio for $$t\bar{t}$$ events with at least one additional b-jet is measured to be 950 $$\pm$$ 70 (stat.) $$^{+240}_{-190}$$ (syst.) fb in the lepton-plus-jets channel and 50 $$\pm$$ 10 (stat.) $$^{+15}_{-10}$$ (syst.) fb in the $$e \mu$$ channel. The cross-section times branching ratio for events with at least two additional b-jets is measured to be 19.3 $$\pm$$ 3.5 (stat.) $$\pm$$ 5.7 (syst.) fb in the dilepton channel ($$e \mu$$, $$\mu \mu$$, and ee) using a method based on tight selection criteria, and 13.5 $$\pm$$ 3.3 (stat.) $$\pm$$ 3.6 (syst.) fb using a looser selection that allows the background normalisation to be extracted from data. The latter method also measures a value of 1.30 $$\pm$$ 0.33 (stat.) $$\pm$$ 0.28 (syst.)% for the ratio of $$t\bar{t}$$ production with two additional b-jets to $$t\bar{t}$$ production with any two additional jets. All measurements are in good agreement with recent theory predictions.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Measurement of differential cross sections for Higgs boson production in the diphoton decay channel in pp collisions at $$\sqrt{s}=8\,\text {TeV}$$ s = 8 TeV
[Hide abstract]
ABSTRACT: A measurement is presented of differential cross sections for Higgs boson (H) production in pp collisions at $$\sqrt{s}=8$$ $$\,\text {TeV}$$. The analysis exploits the $${H} \rightarrow {\gamma }{\gamma }$$ decay in data corresponding to an integrated luminosity of 19.7$$\,\text {fb}^\text {-1}$$ collected by the CMS experiment at the LHC. The cross section is measured as a function of the kinematic properties of the diphoton system and of the associated jets. Results corrected for detector effects are compared with predictions at next-to-leading order and next-to-next-to-leading order in perturbative quantum chromodynamics, as well as with predictions beyond the standard model. For isolated photons with pseudorapidities $$|\eta |<2.5$$, and with the photon of largest and next-to-largest transverse momentum ($$p_{\mathrm {T}} ^{\gamma }$$) divided by the diphoton mass $$m_{\gamma \gamma }$$ satisfying the respective conditions of $$p_{\mathrm {T}} ^{\gamma }/m_{\gamma \gamma }> 1/3$$ and $${>}1/4$$, the total fiducial cross section is $$32 \pm 10$$ $$\text {\,fb}$$.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Exclusive $$\rho ^0$$ ρ 0 meson photoproduction with a leading neutron at HERA
V. Andreev · A. Baghdasaryan · K. Begzsuren · A. Belousov · A. Bolz · V. Boudry · G. Brandt · V. Brisson · D. Britzger · A. Buniatyan · [...] · C. Vallée · P. Van Mechelen · Y. Vazdik · D. Wegener · E. Wünsch · J. Žáček · Z. Zhang · R. Žlebčík · H. Zohrabyan · F. Zomer ·
[Hide abstract]
ABSTRACT: A first measurement is presented of exclusive photoproduction of $$\rho ^0$$ mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of $$\sqrt{s}=319$$ GeV and correspond to an integrated luminosity of 1.16 pb$$^{-1}$$. The $$\rho ^0$$ mesons with transverse momenta $$p_T<1$$ GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, $$x_L>0.35$$, are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality $$Q^2 < 2$$ GeV$$^2$$, the total energy of the photon–proton system $$20 < W_{\gamma p}< 100$$ GeV and the polar angle of the leading neutron $$\theta _n < 0.75$$ mrad. The cross section of the reaction $$\gamma p \rightarrow \rho ^0 n \pi ^+$$ is measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a $$\rho ^0$$ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, $$\sigma ^\mathrm{el}(\gamma \pi ^+ \rightarrow \rho ^0\pi ^+)$$, is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $$\gamma p \rightarrow \rho ^0 n \pi ^+$$.
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Natural NMSSM with a light Singlet Higgs and Singlino LSP
[Hide abstract]
ABSTRACT: Supersymmetry (SUSY) is an attractive extension of the Standard Model (SM) of particle physics which solves the SM hierarchy problem. Motivated by the theoretical $$\mu$$-term problem of the Minimal Supersymmetric Model (MSSM), the Next-to MSSM (NMSSM) can also account for experimental deviations from the SM like the anomalous muon magnetic moment and the dark matter relic density. Natural SUSY, motivated by naturalness considerations, exhibits small fine tuning and a characteristic phenomenology with light higgsinos, stops, and gluinos. We describe a scan in NMSSM parameter space motivated by Natural SUSY and guided by the phenomenology of an NMSSM with a slightly broken Peccei–Quinn symmetry and a lightly coupled singlet. We identify a scenario which survives experimental constraints with a light singlet Higgs and a singlino lightest SUSY particle. We then discuss how the scenario is not presently excluded by searches at the Large Hadron Collider (LHC) and which channels are promising for discovery at the LHC and International Linear Collider.
No preview · Article · Jan 2016 · European Physical Journal C
• Source
Article: Inflation in a viscous fluid model
[Hide abstract]
ABSTRACT: We explore a fluid description of the inflationary universe. In particular, we investigate a fluid model in which the equation of state (EoS) for a fluid includes bulk viscosity. We find that the three observables of inflationary cosmology, i.e., the spectral index of the curvature perturbations, the tensor-to-scalar ratio of the density perturbations, and the running of the spectral index, can be consistent with the recent Planck results. We also reconstruct the explicit EoS for a fluid from the spectral index of the curvature perturbations compatible with the Planck analysis. In the reconstructed models of a fluid, the tensor-to-scalar ratio of the density perturbations can satisfy the constraints obtained from the Planck satellite. The running of the spectral index can explain the Planck data. In addition, it is demonstrated that in the reconstructed models of a fluid, the graceful exit from inflation can be realized. Moreover, we show that the singular inflation can occur in a fluid model. Furthermore, we show that a fluid description of inflation can be equivalent to the description of inflation in terms of scalar field theories.
Preview · Article · Jan 2016 · European Physical Journal C
• Article: Wormhole solutions sourced by fluids, I: Two-fluid charged sources
[Hide abstract]
ABSTRACT: We briefly discuss some of the known and new properties of rotating geometries that are relevant to this work. We generalize the analytical method of superposition of fields, known for generating nonrotating solutions, and apply it to construct massless and massive rotating physical wormholes sourced by a source-free electromagnetic field and an exotic fluid both anisotropic. Their stress-energy tensors are presented in compact and general forms. For the massive rotating wormholes there exists a mass-charge constraint yielding almost no more dragging effects than ordinary stars. There are conical spirals through the throat along which no local negative energy densities are noticed for these rotating wormholes. This conclusion extends to nonrotating massive type I wormholes derived previously by the author that seem to be the first kind of nonrotating wormholes with this property. Based on the classification made in J. Cosmol. Astropart. Phys. 07 (2015) 037 [arXiv:1412.8282]: "Type I wormholes have their radial pressure dying out faster, as one moves away from the throat, than any other component of the stress-energy and thus violate the least the local energy conditions. In type II (resp. III) the radial and transverse pressures are asymptotically proportional and die out faster (resp. slower) than the energy density".
No preview · Article · Jan 2016 · European Physical Journal C
• Article: Search for an additional, heavy Higgs boson in the $$H\rightarrow ZZ$$ H → Z Z decay channel at $$\sqrt{s} = 8\;\text{ TeV }$$ s = 8 TeV in $$pp$$ p p collision data with the ATLAS detector
G. Aad · B. Abbott · J. Abdallah · O. Abdinov · R. Aben · M. Abolins · O. S. AbouZeid · H. Abramowicz · H. Abreu · R. Abreu · [...] · S. Zimmermann · Z. Zinonos · M. Zinser · M. Ziolkowski · L. Živković · G. Zobernig · A. Zoccoli · M. zur Nedden · G. Zurzolo · L. Zwalinski ·
[Hide abstract]
ABSTRACT: A search is presented for a high-mass Higgs boson in the $$H\rightarrow ZZ\rightarrow \ell ^+\ell ^-\ell ^+\ell ^-$$, $$H\rightarrow ZZ\rightarrow \ell ^+\ell ^-\nu \bar{\nu }$$, $$H\rightarrow ZZ\rightarrow \ell ^+\ell ^- q \bar{q}$$, and $$H\rightarrow ZZ\rightarrow \nu \bar{\nu } q \bar{q}$$ decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb$$^{-1}$$. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to $$1~\mathrm{TeV}$$ for all four decay modes and down to as low as 140 $$\mathrm{GeV}$$, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to $$Z$$ boson pairs. 95 % confidence level upper limits range from 0.53 pb at $$m_{H} =195$$ GeV to 0.008 pb at $$m_{H} =950$$ GeV for the gluon-fusion production mode and from 0.31 pb at $$m_{H} =195$$ GeV to 0.009 pb at $$m_{H} =950$$ GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.
No preview · Article · Jan 2016 · European Physical Journal C
• Source
Article: Infrared-improved soft-wall AdS/QCD model for mesons
[Hide abstract]
ABSTRACT: We construct and investigate an infrared-improved soft-wall AdS/QCD model for mesons. Both linear confinement and chiral symmetry breaking of low energy QCD are well characterized in such an infrared-improved soft-wall AdS/QCD model. The model enables us to obtain a more consistent numerical prediction for the mass spectra of resonance scalar, pseudoscalar, vector, and axial-vector mesons. In particular, the predicted mass for the lightest ground state scalar meson shows good agreement with the experimental data. The model also provides a remarkable check for the Gell-Mann–Oakes–Renner relation and a sensible result for the space-like pion form factor.
Preview · Article · Jan 2016 · European Physical Journal C
• Source
Article: A general thermodynamical description of the event horizon in the FRW universe
[Hide abstract]
ABSTRACT: The Friedmann equation in the Friedmann–Robertson–Walker (FRW) universe with any spatial curvature is derived from the first law of thermodynamics on the event horizon. The key idea is to redefine a Hawking temperature on the event horizon. Furthermore, we obtain the evolution equations of the universe including the quantum correction and explore the evolution of the universe in f(R) gravity. In addition, we also investigate the generalized second law of thermodynamics in Einstein gravity and f(R) gravity. This perspective also implies that the first law of thermodynamics on the event horizon has a general description in respect of the evolution of the FRW universe.
Preview · Article · Jan 2016 · European Physical Journal C
• Article: Wormhole solutions sourced by fluids, II: Three-fluid two-charged sources
[Hide abstract]
ABSTRACT: Lack of a consistent metric for generating rotating wormholes motivates us to present a new one endowed with interesting physical and geometrical properties. When combined with the generalized method of superposition of fields, which consists in attaching a form of matter to each moving frame, it generates massive and charged (charge without charge) two-fluid-sourced, massive and two-charged three-fluid-sourced, rotating as well as new static wormholes which, otherwise, can hardly be derived by integration. If the lapse function of the static wormhole is bounded from above, no closed timelike curves occur in the rotating counterpart. For positive energy densities dying out faster than $1/r$, the angular velocity includes in its expansion a correction term, to the leading one that corresponds to ordinary stars, proportional to $\ln r/r^4$. Such a term is not present in the corresponding expansion for the Kerr-Newman black hole. Based on this observation and our previous work, the dragging effects of falling neutral objects may constitute a substitute for other known techniques used for testing the nature of the rotating black hole candidates that are harbored in the center of galaxies. We discuss the possibility of generating ($n+1$)-fluid-sourced, $n$-charged, rotating as well as static wormholes.
No preview · Article · Jan 2016 · European Physical Journal C