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Review   Open Access

Stochastic backgrounds of relic gravitons: a theoretical appraisal

Massimo Giovannini PMC Physics A 2010, 4:1 (19 February 2010)

Abstract | Full text | PDF |  Editor’s summary

Stochastic backgrounds or relic gravitons, if ever detected, will constitute a prima facie evidence of physical processes taking place during the earliest stages of the evolution of the plasma. The essentials of the stochastic backgrounds of relic gravitons are hereby introduced and reviewed.

Letter   Open Access

First evidence of new physics in b ↔ s transitions

Marcella Bona, Marco Ciuchini, Enrico Franco, Vittorio Lubicz, Guido Martinelli, Fabrizio Parodi, Maurizio Pierini, Carlo Schiavi, Luca Silvestrini, Viola Sordini, Achille Stocchi, Vincenzo Vagnoni PMC Physics A 2009, 3:6 (18 December 2009)

Abstract | Full text | PDF |  Editor’s summary

We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs to J/Psi phi by the CDF and D0 collaborations. We find that the phase of the Bs mixing amplitude deviates more than 3 sigma from the Standard Model prediction. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.

Research   Open Access

Quantum cosmology of a classically constrained nonsingular Universe

Abhik Sanyal PMC Physics A 2009, 3:5 (22 October 2009)

Abstract | Full text | PDF |  Editor’s summary

The quantum cosmological version of a nonsingular Universe has been developed and the Hamilton Jacobi equation found under semiclassical (WKB) approximation. It has been pointed out that parameterization of classical trajectories with semiclassicaltime parameter for such a classically constrained system is a nontrivial task and requires Lagrangian formulation rather than the Hamiltonian formalism.

Mini-review   Open Access Highly Accessed

Four statements about the fourth generation

Bob Holdom, WS Hou, Tobias Hurth, Michelangelo L Mangano, Saleh Sultansoy, Gokhan Ünel PMC Physics A 2009, 3:4 (28 September 2009)

Abstract | Full text | PDF |  Editor’s summary

This summary of the Workshop “Beyond the 3-generation SM in the LHC era” presents a brief discussion of the fourth generation.

Review   Open Access Highly Accessed

B meson decays

Marina Artuso, Elisabetta Barberio, Sheldon Stone PMC Physics A 2009, 3:3 (20 February 2009)

Abstract | Full text | PDF |  Editor’s summary

This review article discusses the most important Physics thus far extracted from studies of B meson decays. We also point out where CP-violating and rare decays could lead to observations of physics beyond that of the Standard Model. If such physics is found by directly observation of new particles, e.g. in LHC experiments, B decays can play a decisive role in interpreting the nature of these particles.

Research   Open Access

Universal nonlinear filtering using Feynman path integrals II: the continuous-continuous model with additive noise

Bhashyam Balaji PMC Physics A 2009, 3:2 (10 February 2009)

Abstract | Full text | PDF |  Editor’s summary

In this paper, the Feynman path integral formulation of the continuous-continuous filtering problem, a fundamental problem of applied science, is investigated for the case when the noise in the signal and measurement model is Gaussian and additive. It is shown that it leads to an independent and self-contained analysis and solution of the problem.

Mini-review   Open Access

Weinberg like sum rules revisited

Sergey S Afonin PMC Physics A 2009, 3:1 (8 January 2009)

Abstract | Full text | PDF |  Editor’s summary

The generalized Weinberg sum rules containing the difference of isovector vector and axial-vector spectral functions saturated by both finite and infinite number of narrow resonances are considered. We give a historical survey and summarize the status of these sum rules analyzing their overall agreement with phenomenological Lagrangians, low-energy relations, parity doubling, hadron string models, and experimental data.

Research   Open Access

Study of hadronic event shape in flavour tagged events in e+e- annihilation at 〈s〉 = 197 GeV

Salvatore Mele, the L3 Collaboration PMC Physics A 2008, 2:6 (8 December 2008)

Abstract | Full text | PDF |  Editor’s summary

Results are presented from a study of the structure of hadronic events in high-energy e+e- interactions detected by the L3 detector at LEP. Various event shape distributions and their moments are measured at several energy points at and above the Z-boson mass. A good description of the data is provided by the models.

Research   Open Access Highly Accessed

Plasma focus based repetitive source of fusion neutrons and hard x-rays

V Raspa, F Di Lorenzo, P Knoblauch, A Lazarte, A Tartaglione, A Clausse, C Moreno PMC Physics A 2008, 2:5 (29 October 2008)

Abstract | Full text | PDF |  Editor’s summary

A plasma focus device that operates up to 0.2 Hz for several minutes is used as a source of hard x-rays and fast neutrons, for the detection of hydrogenated substances, different concentrations of water, submillimetric defects in metal, and producing clear images of metallic objects through thick iron walls.

Editorial   Open Access

The dawn of a new era of discovery?

Ken Peach PMC Physics A 2008, 2:4 (10 September 2008)

Abstract | Full text | PDF |  Editor’s summary

Editor in Chief Ken Peach reflects upon the LHC and the questions it seeks to answer.

Research   Open Access

Hadron multiplicity in e+e- events induced by top quark pairs at the ILC energy

Alexandre V Kisselev, Vladimir A Petrov PMC Physics A 2008, 2:3 (4 April 2008)

Abstract | Full text | PDF |  Editor’s summary

The average charged hadron multiplicity in the e+e− events with the primary t¯t-pair at the collision energy 500 GeV, as well as the average multiplicity of charged hadrons from the top quark are calculated in QCD to be 86.7 ± 1.11 and 41.0 ± 0.54, respectively.

Research   Open Access

Effects of supersymmetric threshold corrections on high-scale flavour textures

Altan Çakir, Levent Solmaz PMC Physics A 2008, 2:2 (7 March 2008)

Abstract | Full text | PDF |  Editor’s summary

Integration of superpartners out of the spectrum induces potentially large contributions to Yukawa couplings. Supersymmetric threshold corrections therefore influence the CKM matrix prediction in a non-trivial way. We study the effects of threshold corrections on high-scale flavor structures specified at the gauge coupling unification scale in supersymmetry.

Research   Open Access

Supernova Ia observations in the Lemaître-Tolman model

Krzysztof Bolejko PMC Physics A 2008, 2:1 (12 February 2008)

Abstract | Full text | PDF |  Editor’s summary

This paper investigates whether models including realistic inhomogeneous matter distribution but without the cosmological constant can produce dimming of high-redshift supernovae consistent with acceleration of the Universe. It is found that, although the model mimics observations at small scales, the cosmological constant must be invoked to account for dimming over larger scales.

Research   Open Access

The luminosity-redshift relation in brane-worlds: II. Confrontation with experimental data

Gyula M Szabó, László Á Gergely, Zoltán Keresztes PMC Physics A 2007, 1:8 (12 December 2007)

Abstract | Full text | PDF |  Editor’s summary

The luminosity distance-redshift relation for a wide class of generalized Randall-Sundrum type II brane-world models with Weyl fluid is compared to the presently available supernova data. We find that there is a class of spacially flat models with different amounts of matter and Weyl fluid, which have a very similar fitting quality.

Research   Open Access

Interactive visualization of multidimensional coincidence spectra

Miroslav Morháč, Vladislav Matoušek PMC Physics A 2007, 1:7 (23 November 2007)

Abstract | Full text | PDF |  Editor’s summary

Direct visualization techniques of multidimensional nuclear spectra are presented, as well as visualization techniques based on projections of embedded subspaces. While the first group of graphical models is limited to four dimensions, the second one can be theoretically extended to any dimension.

Research   Open Access

Exclusive ρ0 production in deep inelastic scattering at HERA

ZEUS Collaboration PMC Physics A 2007, 1:6 (12 November 2007)

Abstract | Full text | PDF |  Editor’s summary

Exclusive rho^0 electroproduction at HERA has been studied with the ZEUS detector using 120 pb^{-1} of integrated luminosity collected during 1996-2000. The results include the Q^2 and W dependence of the gamma^* p --> rho^0 p cross section and the distribution of the squared-four-momentum transfer to the proton.

Research   Open Access

Semi-analytical approach to magnetized temperature autocorrelations

Massimo Giovannini PMC Physics A 2007, 1:5 (18 October 2007)

Abstract | Full text | PDF |  Editor’s summary

Cosmic microwave background temperature autocorrelations, induced by a magnetized adiabatic mode of curvature inhomogeneities, are computed with semi-analytical methods. The implications of this investigation for the origin of large-scale magnetic fields in the Universe are discussed, as are connections with forthcoming experimental observations.

Research   Open Access

The luminosity-redshift relation in brane-worlds: I. Analytical results

Zoltán Keresztes, László Á Gergely, Botond Nagy, Gyula M Szabó PMC Physics A 2007, 1:4 (2 October 2007)

Abstract | Full text | PDF |  Editor’s summary

The luminosity distance-redshift relation is analytically given for generalized Randall-Sundrum type II brane-world models containing Weyl fluid either as dark radiation or as a radiation field from the brane. The derived analytical results are suitable for future testing of the models.

Research   Open Access

Ricci Flow Gravity

Wolfgang Graf PMC Physics A 2007, 1:3 (2 October 2007)

Abstract | Full text | PDF

Research   Open Access

Dilaton and off-shell (non-critical string) effects in Boltzmann equation for species abundances

AB Lahanas, NE Mavromatos, DV Nanopoulos PMC Physics A 2007, 1:2 (2 October 2007)

Abstract | Full text | PDF |  Editor’s summary

The amount of dark matter left over from the early universe may be less than previously believed. This paper shows that the "relic abundance" of stable dark matter particles such as the neutralino may be reduced as compared to standard cosmology theories due to the effects of the dilaton.

Editorial   Open Access

Welcome to PMC Physics A

Ken Peach PMC Physics A 2007, 1:1 (2 October 2007)

Abstract | Full text | PDF

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