Double hadron lepto-production in the current and target fragmentation regions

We study the inclusive production of two hadrons in deep inelastic processes, l N ---> l h_1 h_2 X, with h_1 in the current fragmentation region (CFR) and h_2 in the target fragmentation region (TFR). Assuming a factorized scheme, the recently introduced polarized and transverse momentum dependent fracture functions couple to the transverse momentum dependent fragmentation functions. This allows the full exploration of the fracture functions for transversely polarized quarks. Some particular cases are considered.Comment: 14 pages, 2 figure

SIDIS in the target fragmentation region: polarized and transverse momentum dependent fracture functions

The target fragmentation region of semi-inclusive deep inelastic scattering is described at leading twist, taking beam and target polarizations into account. The formalism of polarized and transverse-momentum dependent fracture functions is developed and the observables for some specific processes are presented.Comment: 18 pages, 2 figures. Some equations modified and text shortened; main conclusions unchange

Correlations between SIDIS azimuthal asymmetries in target and current fragmentation regions

We shortly describe the leading twist formalism for spin and transverse-momentum dependent fracture functions recently developed and present results for the production of spinless hadrons in the target fragmentation region (TFR) of SIDIS. In this case not all fracture functions can be accessed and only a Sivers-like single spin azimuthal asymmetry shows up at LO cross-section. Then, we show that the process of double hadron production in polarized SIDIS -- with one spinless hadron produced in the current fragmentation region (CFR) and another in the TFR -- would provide access to all 16 leading twist fracture functions. Some particular cases are presented.Comment: Talk given by Aram Kotzinian at the Third International Workshop on Transverse Polarization Phenomena in Hard Scattering (Transversity 2011), in Veli Losinj, Croatia, 29 August - 2 September 2011. 6 page

The Sivers asymmetry in Drell–Yan production at the J /Ψ peak at COMPASS

The abundant production of lepton pairs via J/Ψ creation at COMPASS, π±p↑→J/ΨX→ℓ+ℓ−X, allows a measurement of the transverse single spin asymmetry, ANJ/Ψ, generated by the Sivers effect. The crucial issue of the sign change of the Sivers function in Drell–Yan lepton pair production, with respect to Semi Inclusive Deep Inelastic Scattering processes, can be addressed in a different context. Assuming that the Sivers asymmetry is related to a universal and intrinsic property of the proton, predictions for the expected magnitude of ANJ/Ψ, which turns out to be large, are given. A comparison with the suggested measurement of this single spin asymmetry – an important quantity by itself – should give valuable information

IMPIEGO DI METODOLOGIE DI CLASSIFICAZIONE NELLA PIANIFICAZIONE DEI CONTROLLI FISCALI

L’evasione fiscale in Italia è un fenomeno diffuso, stimato in oltre 120 mld € annui. Si vuole quindi valutare se tecniche di data mining (alberi e regole su tutti) possano essere applicate con successo in questo ambito. Dai test effettuati appare come l’impiego di tali tecniche possa fornire una guida flessibile ed efficace nella selezione dei soggetti da controllare

Arte, scienza e storia in un mondo globalizzato: il caso Italia-Cina

Art and science, over the centuries, though starting from different positions, have very often led to the same conclusions. History, on the other hand, establishes identities that derive from our past and allows for exchanges and unity between people of different nationalities, in both a commercial and scientific context, in a world without borders, in spite of obvious contradictions related to this globalized world. The case of Italy-China bears witness to this in a significant way.A case in point is represented by the scientific collaboration between the Alma Mater University of Bologna and Zhejiang University, as well as that between the Salesian Pontifical University of Rome and Fudan University in Shanghai, Zhejiang University and the Foreign Studies University of Beijing.In the first case, the ongoing research project “Historical anamnesis, preservation and valorization of the statues of the Longxing Buddhist Temple of Qingzhou (China)” is being carried out between the Department of Cultural Heritage Diagnostic Laboratory for Cultural Heritage of the University of Bologna and the Cultural Heritage Institute of Zhejiang University. In the second case, collaboration between the Salesian Pontifical University and the Chinese Universities, covers activities relating to the study of philosophy, pedagogy and Latin language and literature.The paper highlights the importance of drawing value of a cultural, conservative, social, identitary nature within the context of the holistic value of cultural heritage and respecting ethical aspects at a personal and interpersonal level, in particular, by offering young people the opportunity to enter the employment market and of which they are currently experiencing all the problematic fluctuations.Arte e scienza, nel corso dei secoli, pur partendo da posizioni iniziali differenti, molto spesso conducono alle stesse conclusioni. D’altra parte la storia stabilisce le identità che nascono dal passato e permette scambi e coesioni fra genti di diversa nazionalità, in campo sia commerciale sia scientifico, in un mondo senza confini. Pur con contraddizioni evidenti riconducibili a questo mondo globalizzato, una significativa testimonianza è rappresentata da Italia-Cina. Al riguardo, si fa riferimento alla collaborazione scientifica fra l’Alma Mater Studiorum Università di Bologna e Zhejiang University nonché fra l’Università Pontificia Salesiana di Roma e Fudan University di Shanghai, Zhejiang University e Beijing Foreign Studies University. Nel primo caso è in atto il progetto di ricerca “Historical anamnesis, preservation and valorization of the statues of the Longxing Buddhist Temple of Qinzhou (Cina)” fra il Dipartimento di Beni Culturali - Laboratorio Diagnostico per i Beni Culturali dell’Università di Bologna e il Cultural Heritage Institute di Zhejiang University. Nel secondo caso la collaborazione fra l’Università Pontificia Salesiana e le Università cinesi riguarda attività relative agli studi di filosofia, pedagogia e lettere latine. Si fa presente l ’importanza di trarre benefici di carattere culturale, conservativo, sociale, identitario nell’ ambito del valore olistico del bene culturale e nel rispetto degli aspetti etici a livello personale e interpersonale, offrendo in particolare ai giovani la possibilità di entrare nel mercato del lavoro del quale vivono le attuali e problematiche fluttuazioni

Interaction of Cd(II) and Ni(II) terpyridine complexes with model polynucleotides: a multidisciplinary approach

Two metal complexes of 2,2′:6′,2″-terpyridine (terpy), i.e. Cd(terpy)Cl2 and Ni(terpy)Cl2·3H2O, have been prepared and extensively characterized. The interaction of Cd(terpy)Cl2 with synthetic DNA models, poly(dA-dT)·poly(dA-dT) (polyAT) and poly(dG-dC)·poly(dG-dC) (polyGC), has been studied by CD, fluorescence and UV-vis electronic absorption spectroscopy at several metal/polynucleotide-phosphate ratios and for different NaCl concentrations. All the experimental results indicate an intercalative mechanism of interaction. The optimized geometry of the cadmium complex intercalated between the sixth and seventh base pairs of (AT) and (GC) dodecanucleotide duplexes, obtained by quantum mechanics/molecular mechanics (QM/MM) calculations, lends support to the proposed mechanism. The calculated models provide some additional structural details of the intercalation complex at the molecular level. To evidence the influence of the charge and geometry of the metal complex on the mechanism of interaction with polynucleotides, the nickel complex-polyAT system has been studied to some extent by means of CD and UV-vis spectroscopy, and by thermal melting experiments. The results suggest that the octahedral complex cation [Ni(terpy)(H2O)2Cl]+ interacts with polyAT by partial intercalation assisted by electrostatic interaction with the negative charges of the backbone phosphate groups

Current-Resistance Effects Inducing Nonlinear Fluctuation Mechanisms in Granular Aluminum Oxide Nanowires

The unusual superconducting properties of granular aluminum oxide have been recently investigated for application in quantum circuits. However, the intrinsic irregular structure of this material requires a good understanding of the transport mechanisms and, in particular, the effect of disorder, especially when patterned at the nanoscale level. In view of these aspects, electric transport and voltage fluctuations have been investigated on thin-film based granular aluminum oxide nanowires, in the normal state and at temperatures between 8 and 300 K. The nonlinear resistivity and two-level tunneling fluctuators have been observed. Regarding the nature of the noise processes, the experimental findings give a clear indication in favor of a dynamic random resistor network model, rather than the possible existence of a local ordering of magnetic origin. The identification of the charge carrier fluctuations in the normal state of granular aluminum oxide nanowires is very useful for improving the fabrication process and, therefore, reducing the possible sources of decoherence in the superconducting state, where quantum technologies that are based on these nanostructures should work