Quenched lattice calculation of the B --> D l nu decay rate

We calculate, in the continuum limit of quenched lattice QCD, the form factor that enters in the decay rate of the semileptonic decay B --> D l nu. Making use of the step scaling method (SSM), previously introduced to handle two scale problems in lattice QCD, and of flavour twisted boundary conditions we extract G(w) at finite momentum transfer and at the physical values of the heavy quark masses. Our results can be used in order to extract the CKM matrix element Vcb by the experimental decay rate without model dependent extrapolations.Comment: 5 pages, 4 figures, accepted for publication on Phys. Lett. B, corrected one typ

A low complexity resource allocation algorithm for multicast service delivery in OFDMA networks

Allocating and managing radio resources to multicast transmissions in Orthogonal Frequency-Division Multiple Access (OFDMA) systems is the challenging research issue addressed by this paper. A subgrouping technique, which divides the subscribers into subgroups according to the experienced channel quality, is considered to overcome the throughput limitations of conventional multicast data delivery schemes. A low complexity algorithm, designed to work with different resource allocation strategies, is also proposed to reduce the computational complexity of the subgroup formation problem. Simulation results, carried out by considering the Long Term Evolution (LTE) system based on OFDMA, testify the effectiveness of the proposed solution, which achieves a near-optimal performance with a limited computational load for the system

The impact of ISO 45001 on firms' performance: An empirical analysis

The aim of this study is to shed light on the relationship between ISO 45001 adoption and firm performance. To explore the issue, we conduct an event study and a weighted least squares regression on a dataset of 157 publicly listed companies – operating in various countries and sectors – that have given public announcement of the attainment of the ISO 45001 certification. The results show that, when compared to non-adopters, ISO 45001-certified companies display better performance in terms of productivity and profitability, while no significant differences emerge for sales. The effects of ISO 45001 adoption are significantly influenced by industry- and company-related contextual factors. The study contributes to the academic literature by developing the first large-scale empirical investigation on the performance implications of ISO 45001. Furthermore, it informs managers that by ensuring healthy and safe workplaces companies can also achieve higher financial performance