KsKs resonances in deep inelastic scattering at HERA

Inclusive KsKs production in deep inelastic ep scattering at HERA has been studied with the ZEUS detector using an integrated luminosity of 120 pb-1. Two states are observed at masses of 1537{+9}{-8} MeV and 1726{+-7} MeV, as well as an enhancement around 1300 MeV. The state at 1537 MeV is consistent with the well established f'2(1525). The state at 1726 MeV may be the glueball candidate f0(1710). However, it's width of 38{+20}{-14} MeV is narrower than 125{+-10} MeV observed by previous experiments for the f0(1710).Comment: 5 pages, 3 figures, to appear in the proceedings of the 10th International Conference on Hadron Spectroscopy, Aschaffenburg (Germany), August 31 to September 6, 200

Hadron Spectroscopy at HERA

Inclusive photoproduction cross-sections of the neutral mesons eta, rho^0, f_0(980) and f_2(1270) have been measured by H1 and compared to the photoproduction of pi^+ in ep collisions at HERA. Also, inclusive KsKs production and evidence for a narrow baryonic state decaying to Ksp have been observed by ZEUS at HERA.Comment: 5 pages, 4 figures, to appear in the proceedings of the Lake Louise Winter Institute (LLWI 2004), Alberta, Canada, 15-21 February, 200

Assessing the rate of ageing of the human population

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On the ion-mediated interaction between protein and DNA

The mechanism allowing a protein to search of a target sequence on DNA is currently described as an intermittent process composed of 3D diffusion in bulk and 1D diffusion along the DNA molecule. Due to the relevant charge of protein and DNA, electrostatic interaction should play a crucial role during this search. In this paper, we explicitly derive the mean field theory allowing for a description of the protein-DNA electrostatics in solution. This approach leads to a unified model of the search process, where 1D and 3D diffusion appear as a natural consequence of the diffusion on an extended interaction energy profile.Comment: Proceedings of the 29th ICMP Conference, Tianjin, China (2013

Renormalization Group Analysis of Turbulent Hydrodynamics

Turbulent hydrodynamics is characterised by universal scaling properties of its structure functions. The basic framework for investigations of these functions has been set by Kolmogorov in 1941. His predictions for the scaling exponents, however, deviate from the numbers found in experiments and numerical simulations. It is a challenge for theoretical physics to derive these deviations on the basis of the Navier-Stokes equations. The renormalisation group is believed to be a very promising tool for the analysis of turbulent systems, but a derivation of the scaling properties of the structure functions has so far not been achieved. In this work, we recall the problems involved, present an approach in the framework of the exact renormalisation group to overcome them, and present first numerical results.Comment: 43 pages, revised version, to be published in Physics Research Internationa

Stabilization of ratchet dynamics by weak periodic signals

We study the influence of weak periodic signals on the transport properties of underdamped ratchets. We find that the constant current intervals related to the ratchet, can be significantly enlarged by a weak subharmonic signal which is in phase with the internal driver. This stabilization phenomenon is found to exist both in absence and in presence of noise. The dependence of this effect on the phase of the applied signal is also investigated.Comment: tex + 4 figures.ps in a .tar archive / submitted to PR

Cause-specific mortality as a sentinel indicator of current socioeconomic conditions in Italy

This study aims to assess whether simple, widely available demographic indexes, like mortality measures, may serve as sentinel indicators of the economic development and the social wellbeing in Italy. We analyze and compare the geographical patterns of all-cause mortality indexes and those of the mortality rates for leading causes of death, with the spatial pattern found for a more complex index, the vulnerability index, recently introduced by the Italian National Institute for Statistics, at provincial level in the contemporary Italy. We show that mortality data are a straightforward and powerful tool for driving policy makers in planning appropriate interventions

Vector Nonlinear Klein-Gordon Lattices: General Derivation of Small Amplitude Envelope Soliton Solutions

Group velocity and group velocity dispersion for a wave packet in vectorial discrete Klein-Gordon models are obtained by an expansion, based on perturbation theory, of the linear system giving the dispersion relation and the normal modes. We show how to map this expansion on the Multiple Scale Expansion in the real space and how to find Non Linear Schr\"odinger small amplitude solutions when a nonlinear one site potential balances the group velocity dispersion effect