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High Gradient Acceleration Studies at SLAC

Accelerating gradient is one of the crucial parameters affecting the design, construction, cost, and energy reach of the next generation linear accelerators. The main phenomenon that limits the gradient of rf linacs is vacuum rf breakdown. I present recent R&D efforts directed toward increasing the operating gradients of normal conducting accelerating structures. This work includes study of the basic physics of rf breakdown phenomena and novel methods of building the accelerating structures. The study of the basic physics includes high power tests of short X-band accelerating cavities at room and cryogenic temperatures, and high gradient tests of mm-wave accelerating structures. Novel methods of manufacturing include precision milling of full scale accelerating structures and use of new materials such as hard copper-silver alloy.

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Autumn Institute – Challenges in collider physics

Aim of the workshop: This meeting aims at gathering theorists and experimentalists working in the Rome area in the field of collider physics. In an informal environment, we shall discuss several issues, which are relevant at present (LHC) and future accelerators. In particolar, we shall debate the phenomenology of dark photons, parton distribution functions, the state of the art of higher order QCD corrections as well as top-quark phenomenology, paying special attention to CP violation in top decays. Speakers: Roberto Bonciani (Universita' di Roma `La Sapienza') "Planar two-loop corrections to Higgs+jet production in QCD" Marco Bonvini (Universita' di Roma `La Sapienza') "Theory uncertainty from missing higher orders" Lucio Cerrito (Universita' di Roma `Tor Vergata') "Top B physics with the ATLAS experiment" Marco Guzzi (Manchester University) "The structure of the proton global analysis in QCD and LHC precision physics" Barbara Mele (INFN Roma) "Massless dark-photon phenomenology at colliders"

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The Extreme Energy Events project: a sparse array of telescopes for cosmic radiation

The Extreme Energy Events project is meant to be the most extensive experiment to detect secondary cosmic particles in Italy. To this aim, a network of more than 50 telescopes has been built at CERN and installed in high schools distributed all over the Italian territory. Each EEE telescope comprises three layers of large area (80 x 160 cm2) Multi-gap Resistive Plate Chambers (MRPCs) with six 300 µm gas gaps each, based on the same technology used for the ALICE time-of-flight detector at LHC. The telescopes are capable of reconstructing the trajectories of the charged particles traversing them with a good angular resolution. The excellent performance of the EEE telescopes allows a large variety of studies, ranging from the measure of the local muon flux in a single telescope, to detecting extensive air showers producing time correlations in the same metropolitan area, to searching for large-scale correlations between showers detected in telescopes tens, hundreds or thousands of kilometers apart. Together with its scientific goals, the EEE Project also aims to involve high school students and teachers in the construction, testing and start-up of the EEE telescope in their school, later on in its maintenance and data-acquisition, and finally in the analysis of the data. During the last couple of years the experiment entered its maturity phase, and a great boost has been given to the EEE project by organizing simultaneous and centralized data taking with the whole telescope array contributing. The raw data from all telescopes are transferred to CNAF ...

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Terzo Incontro Nazionale di Fisica Nucleare INFN2016

Il Terzo Incontro Nazionale di Fisica Nucleare si terrà a Frascati presso i Laboratori Nazionali di Frascati dal 14 al 16 novembre 2016. Questa serie di incontri, di cui il primo si è tenuto a Catania presso i Laboratori Nazionali del Sud nel novembre del 2012 e il secondo a Padova e ai Laboratori Nazionali di Legnaro nel marzo del 2014, nasce come iniziativa di ricercatori INFN e universitari con l'obiettivo di creare un'occasione di confronto per la comunità italiana di fisici, teorici e sperimentali, attivi nel campo della fisica nucleare. L’incontro, promosso dalle Commissioni Scientifiche Nazionali 3, 4 e 5, è organizzato in cinque sessioni plenarie nel corso delle quali saranno esaminate e discusse problematiche relative a diversi ambiti della fisica adronica e nucleare: Dinamica dei quark e degli adroni Transizioni di fase e plasma di quark e gluoni Struttura nucleare e dinamica delle reazioni Astrofisica nucleare Applicazioni e interdisciplinarietà della fisica nucleare Le sessioni prevedono relazioni su invito di carattere generale che illustreranno le attività della nostra comunità nei vari settori, inquadrandole nel contesto internazionale, mettendo in evidenza i punti di contatto con altre linee di ricerca e delineandone le prospettive. In questo incontro saranno previste delle presentazioni da parte di giovani ricercatori, selezionati dal Comitato Organizzatore sulla base degli abstracts che verranno ricevuti. È inoltre fissata una sessione di posters per martedi pomeriggio. Verranno premiati  i tre migliori poster e le tre migliori presentazioni dei giovani ricercatori. Affinché tutti i partecipanti abbiano la possibilità di intervenire, alla ...

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Dark matter: an historical perspective

I will review in this seminar this historical evolution of the concept of"Dark Matter", from the first observations of "anomalies" in the 30's until the development of the hypothesis of the existence of a dark halo. The presentation will be entirely based on the original historical authors, reconstructing (by their ideas but also their mistakes) the appearance of a dark side of the Universe. The talk will include discussions of original articles by Poincaré, Zwicky, Oort, Jansky, Gamow, Peebles, Zeldovich, Bond and many others, opening on the prospect for the near future.

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New physics in B-meson decays

Current B-physics data contain two intriguing tensions. First, the LHCb collaboration has reported on some anomalies in b-s transitions, with discrepancies with the Standard Model predictions in some angular observables and branching ratios and an intriguing hint for lepton universality violation. And second, BaBar, Belle and LHCb have found compatible deviations in observables associated to b-c transitions, again hinting at the violation of lepton universality. We will review the proposed explanations for these tensions and focus on new physics models that can simultaneously address both anomalies. In particular, we will show that a simple gauge extension of the Standard Model can achieve such goal.

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KLOE-2 Workshop on e+e- collision physics at 1 GeV

The Workshop will be devoted to a thoroughly discussion of the KLOE-2 Physics program at DAPHNE, and more in general about topics related to e+e- Physics at 1 GeV c.m energy: – CP and T violation, CPT and QM tests – KS decays, eta decays and chiral lagrangians – Phi decays, light hadron spectroscopy and transition form factors – gamma-gamma Physics – Dark force searches – Hadronic contribution to the anomalous magnetic moment of the muon – Low energy kaon interactions – Future machines and new detectors A special session on Friday 28th will be devoted to new proposals for the measurement of the hadronic contribution to the muon g-2. The Conference will consist of plenary sessions held at the LNF Bruno Touschek Auditorium Hall, with invited talks.

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Spin-Statistics, Quantum Decoherence and CPT Violation: models, consequences and searches

In the presence of quantum gravity space-time fluctuations, Lorentz invariance and/or spin-statistic relation and quantum coherence of particles may be lost and the latter may lead to an ill-defined nature of the quantum mechanical CPT operator. I first discuss theoretical motivations and estimates for such a CPT Violation, and then proceed to describe current experimental searches, including the VIP experiment and its upgrades for searches of violation of the Pauli principle, as well as searches of quantum-gravity-decoherence-induced CPT violation in entangled states of mesons of interest to this laboratory. Specifically, in the latter case, there is an effect, termed the omega-effect, which affects the Einstein-Podolsky-Rosen correlations of entangled particle states, in a characteristic way to be detected in principle in entangled neutral Kaon or B systems.

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