Entanglement plays an important role in quantum information processing and communication, such as quantum computation, secret sharing, teleportation, and quantum key distribution [1-3]. Over the last decade, characterizing or/and quantifying entanglement has been recognized as one of central tasks in quantum information science. Correspondingly, there have been many efforts in this direction, f...

The rare decay B0 → φφ can occur only via penguin annihilation topology in the standard model. We calculate this channel in the perturbative QCD approach. The predicted branching ratio is very small at (10−8). We also give the polarization fractions, which shows that the transverse polarization contribution is comparable to the longitudinal one, due to a big transverse contribution from factori...

In this paper, we present the first tests performed after full installation of SIDDHARTA-2 experimental apparatus on Interaction Region DA{\Phi}NE collider at INFN National Laboratories Frascati. Before starting measurement kaonic deuterium 2p{\rightarrow}1s transition, accurate evaluation background rejection. mainly achieved with Kaon Trigger system, was required. This run, in period 04-26/05...

We estimate the contribution of Massive Compact Halo Objects (Machos) and their stellar progenitors to the mass density of the Universe. If the Machos that have been detected reside in the Halo of our Galaxy, then a simple extrapolation of the Galactic population (out to 50 kpc) of Machos to cosmic scales gives a cosmic density ρMacho = (1 − 5) × 10 hM Mpc , which in terms of the critical densi...