Search for squarks and gluinos with the ATLAS detector in final states with jets and missing transverse momentum using root s=8 TeV proton-proton collision data

A search for squarks and gluinos in final states containing high-pT jets, missing transverse momentum and no electrons or muons is presented. The data were recorded in 2012 by the ATLAS experiment in root s = 8 TeV proton-proton collisions at the Large Hadron Collider, with a total integrated luminosity of 20.3 fb(-1). Results are interpreted in a variety of simplified and specific supersymmetry-breaking models assuming that R-parity is conserved and that the lightest neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 1330 GeV for a simplified model incorporating only a gluino and the lightest neutralino. For a simplified model involving the strong production of first- and second-generation squarks, squark masses below 850 GeV (440 GeV) are excluded for a massless lightest neutralino, assuming mass degenerate ( single light-flavour) squarks. In mSUGRA/CMSSM models with tan beta = 30, A(0) = -2m(0) and mu > 0, squarks and gluinos of equal mass are excluded for masses below 1700 GeV. Additional limits are set for non-universal Higgs mass models with gaugino mediation and for simplified models involving the pair production of gluinos, each decaying to a top squark and a top quark, with the top squark decaying to a charm quark and a neutralino. These limits extend the region of supersymmetric parameter space excluded by previous searches with the ATLAS detector

Il Partito Comunista d'Italia e l'organizzazione delle masse (1929-1934)

ItQuesto saggio analizza i condizionamenti che l'Internazionale Comunista (IC) esercitò sul Partito Comunista d'Italia (PCd'I) nella sua attività estera nel periodo 1929-1934. Secondo l'IC, la crisi economica del 1929 (a) costituiva la fine della fase di «relativa stabilizzazione» del capitalismo, (b) intensificava i processi di «radicalizzazione delle masse» e (c) riapriva per i partiti comunisti dell'IC la prospettiva di una nuova fase rivoluzionaria. A livello ideologico, sebbene con qualche esitazione, il Parito Comunista italiano adottò la categoria del «socialfascismo» e si impegnò in una dura lotta contro l'«opportunismo», tanto all'interno del gruppo dirigente quanto tra i quadri intermedi e alla base del partito. A livello politico vennero espulsi noti dirigenti, quali Angelo Tasca, Alfonso Leonetti, Pietro Tresso, Paolo Ravazzoli, Ignazio Silone. Analogamente, anche Vincenzo Gigante, un funzionario intermedio, fu costretto ad abbandonare l'attività politica: quest'ultimo avvenimento costituisce il caso di studio del presente lavoro.EnThis article analyses the restrictions that the Communist International (CI) imposed to the leadership of the Communist Party of Italy (CPI) to their abroad activity during the period 1929-1934. According to the CI, the crisis of the 1929 (a) caused the end of the «relative stabilization» of the capitalism, (b) intensified the process of «radicalization of the masses» and (c) opened up the perspective of a new revolutionary phase for the communist parties belonging to the CI itself. On the theoretical level and with some hesitation, the CPI endorsed the «social fascism» category and started to struggle heavily against the «opportunism» in the leadership, among the middle-ranking officers and in the party's base. On the political level, relevant leaders were expelled, such as Angelo Tasca, Alfonso Leonetti, Pietro Tresso, Paolo Ravazzoli, Ignazio Silone, while Antonio Vincenzo Gigante, an - intermediate officer - was forced to leave the political activity: this latter event is the study case presented in this paper