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- Alessandro Cafarella, Costas G. Papadopoulos, Malgorzata Worek
- Computer Physics Communications
- 2009

We present next-to-leading order predictions for double transverse-spin asymmetries in Drell–Yan dilepton production initiated by proton–antiproton scattering. The kinematic region of the proposed PAX experiment at GSI: 30 . s . 200GeV and 2 . M . 7GeV is examined. The Drell–Yan asymmetries turn out to be large, in the range 20 − 40%. We show that the… (More)

We present a study of the multiplicities, of the lateral distributions and of the ratio of the electromagnetic to the hadronic components in the air showers, generated by the collision in the atmosphere of an incoming high energy cosmic ray and mediated by the formation of a mini black hole, predicted in TeV scale gravity models with large extra dimensions.… (More)

Theories with large extra dimensions [1] invoke a brane picture of the universe, with matter confined on a brane embedded in a higher D-dimensional space (D = 4 + N), and only gravity free to propagate in the extra dimensions. A certain number, say n, of the N extra dimensions may be large, with size of the order of a millimeter. These scenarios are… (More)

- A Cafarella, M Leo, R A Leo
- Physical review. E, Statistical, nonlinear, and…
- 2004

The stability of the one-mode nonlinear solutions of the Fermi-Pasta-Ulam beta system is numerically investigated. No external perturbation is considered for the one-mode exact analytical solutions, the only perturbation being that introduced by computational errors in the numerical integration of motion equations. The threshold energy for the excitation of… (More)

We present a study of the decay of an intermediate mini black hole at the first impact of a cosmic ray particle with the atmosphere, in the context of D-brane world scenarios with TeV scale gravity and large extra dimensions. We model the decay of the black hole using the semiclassical approximation and include the corrections coming from energy loss into… (More)

- A Cafarella, C Corianò, A E Faraggi
- 2003

Stable Superstring Relics (SSR) provide some of the candidates for the possible origin of the Ultra High Energy Cosmic Rays (UHECR). After a brief overview of the motivations for introducing such relics, we address the question whether statistical fluctuations in the formation of the air showers generated by the primary spectrum of protons can be separated… (More)

- A Cafarella, C Corian ` O And, M Guzzi
- 2002

Renormalization Group Equations in integro-differential form describing the evolution of cascades or resumming logarithmic scaling violations have been known in quantum field theory for a long time. These equations have been traditionally solved by turning to Mellin moments, since in this space they become algebraic. x-space solutions are less known, but… (More)

New methods of solutions of the DGLAP equation and their implementation through NNLO in QCD are briefly reviewed. We organize the perturbative expansion that describes in xspace the evolved parton distributions in terms of scale invariant functions, which are determined recursively, and logarithms of the ratio of the running couplings at the initial and… (More)

A NNLO analysis of certain logarithmic expansions, developed for precision studies of the evolution of the QCD parton distributions (pdf) at the large hadron collider, is presented. We elaborate on their relations to all the solutions of the DGLAP equations that have been hitherto obtained from Mellin space, to which are equivalent. Exact expansions,… (More)