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TRANSVERSITY 2017

Modern developments in hadron physics emphasize the role of parton intrinsic motion and spin, and their correlations, which are crucial to our full understanding of the nucleon structure in terms of the quark and gluon degrees of freedom in QCD. The main aim of the workshop is to provide an environment in which present theoretical and experimental knowledge in the field of transversity, transverse-momentum dependent distribution and fragmentation functions as well as generalized parton distribution functions will be presented and discussed in depth, together with new theoretical ideas and experimental perspectives. An attendance of about 80 participants is expected. The scientific program will consist of some 50 presentations (by invitation only) in addition to one or two round-table discussions. The Workshop follows the successful editions held in : 2005 on Lake Como (Italy), 2008 Ferrara (Italy), 2011 in Losinj (Croatia), 2014 Cagliari (Italy).

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Flavor physics anomalies

I will discuss the recent B-physics results which indicate intriguing deviations from the Standards Model expectations. I will focus on several New Physics scenarios which are currently being explored. I will then go through several flavor physics observables and argue that they too could provide us with access to New Physics if the hadronic uncertainties are tamed by means of Lattice QCD.

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Strange and non-strange mesons induced processes studies at DAFNE, J-PARC and RIKEN: present and future

                                                  During the Symposium the strange and non-strange mesons induced processes studies at the DAFNE collider at LNF-INFN, Italy, and at the J-PARC and RIKEN facilities in Japan will be discussed in a unitary framework. The experimental research is focused on several complementary key processes, resulting either from stopped or low-energy kaon induced reactions at the DAFNE collider, from high-energy kaons induced reactions at J-PARC to pionic atoms studied at RIKEN. Studies of kaonic atoms and pionic atoms , of the hyperon-nucleon interactions, as well as the search for deeply bound kaonic nuclear states deliver new constraints on the antikaon-nucleon/nuclei and pion-nucleon/nuclei interactions. Taking advantage of advanced detector systems, such as high precision X-ray detectors, active targets, trackers and calorimeters, and considering the opportunity to use the Italian and Japanese facilities in the coming years, we face the unique chance for resolving the ambiguities and shed new light on the structure of the neutron stars and arrive to a new understanding of the role of strangeness in the Universe. The Symposium is organized with the support of the StrangeMatter (Strangeness in the compact stars? High precision experimental and theoretical studies of the strange matter nuclear interactions at low-energies) project, financed by the Ministero degli Affari Esteri e della Cooperazione Internazionale, Direzione Generale per la Promozione del Sistema Paese.   Organizers: Catalina Curceanu, LNF-INFN (Chair) Kenta Itahashi, RIKEN (Japan) Masahiko Iwasaki, RIKEN (Japan) Fuminori Sakuma, RIKEN (Japan) Alessandro Scordo, LNF-INFN (Italy) Johann Zmeskal, SMI-Vienna (Austria)  

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Charged lepton flavour violation: precise background calculation and effective field theoretical interpretation

This seminar reviews recent theoretical developments in the study of charged lepton flavour violation. The first part illustrates the status of precise next-to-leading order quantum electrodynamics calculations for the background of charged lepton flavour-violating processes, with a focus on the muonic “rare” and “radiative” decays. Phenomenological implications of these computations and their impact on present and future experiments will be discussed. The second part describes the recent progress in the effective field theory interpretation of charged lepton-flavour violating observables in connection with different energy scales. A systematic approach is briefly presented and applications on muonic and tauonic observables are reported.

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Highlights from the CMS experiment

A selection of the most recent results from the CMS experiment will be presented. The results are based on the analysis of the proton-proton (pp) collision data delivered by the LHC in year 2016, at an energy of 13 TeV in the pp centre of mass system, corresponding to an integrated luminosity of about 40/fb. The LHC and CMS performance will be briefly described. The latest updated results on the standard model (SM) precision measurements for the scalar and top sectors will be first presented. It includes the new H scalar property measurements from the 4 lepton decay channel and the 3 sigma evidence for the ttH coupling, in the multi lepton final states. In the second part, the latest results on the searches for new physics beyond the SM will be presented, including searches for dark matter particles.

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The REDTOP experiment: Rare Eta Decays with a TPC for Optical Photons

The $eta$ meson is almost unique in the particle universe since it is a Goldstone boson and the dynamics of its decay are strongly constrained. Because the eta has no charge, decays that violate conservation laws can occur without interfering with a corresponding current. The integrated eta meson samples collected in earlier experiments have been less than ~$10^8$ events, limiting considerably the search for such rare decays. Only recently, WASA-at-Cosy produced about 10^9 eta, starting to breach into new physics. A new experiment, REDTOP, is being proposed to the scientific community with the intent of collecting more than $10^{13}$ triggers/year for studies of rare $eta$ decays. Such statistics are sufficient for investigating several symmetry violations, and for searches for new particles beyond the Standard Model. The physics program, the accelerator systems and the detector for REDTOP will be discussed during the colloquium.

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Rainbows with positrons and carbon nanotubes

The lecture is devoted to a quantum mechanical consideration of the transmission of positrons of a kinetic energy of 1 MeV through very short (11, 9) single-wall chiral carbon nanotubes. The nanotube lengths are between 50 and 320 nm. The transmission process is determined by the rainbow effects. The interaction potential of a positron and the nanotube is deduced from the Molière’s interaction potential of the positron and a nanotube atom using the continuum approximation. The time-dependent Schrödinger equation is solved numerically, and the spatial and angular distributions of transmitted positrons are calculated. The initial positron beam is assumed to be an ensemble of non-interacting Gaussian wave packets. The spatial and angular distributions are generated using a computer simulation method. The examination is focused on the spatial and angular primary rainbows. It begins with an analysis of the corresponding classical rainbows, and continues with a detailed investigation of the amplitudes and phases of the wave functions of transmitted positrons. These analyses enable one to identify the principal and supernumerary primary rainbows appearing in the spatial and angular distributions. They also result in a detailed explanation of the way of their generation, which includes the effects of wrinkling of each wave packet during its deflection from the nanotube wall, and of its concentration just before a virtual barrier lying close to the corresponding classical rainbow. The wrinkling of the wave packets occurs due to their internal focusing. In addition, the wave packets wrinkle in a mutually coordinated way.

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