5,542 research outputs found
ADRION : Charter routes from antiquity to modern times.
The Adriatic Sea has always been a busy sea from every point of view. Egidio Ivetich explains it well in an essay presented in this volume and in one of his recent works called âHistory of the Adriaticâ. The traffic in this Sea can be measured according to the number of ships that, before the pandemic, used to land and depart from the Adriatic ports: more than 40.000 in total. An impressive number especially if compared to its Western sibling, the Tyrrhenian Sea whose yachting traffics are more intense.
If we compare the current situation with a not too distant past, we can understand how the role of this âliquid territoryâ (a neologism invented by the memorable Fernand Braudel) - as a system of relationships- has not changed much. An immense âspace-movementâ, an impressive traffic system made of liquid plains connected through a series of wide or narrow doors. Herodotus, who believed the Adriatic was not a sea but rather a piece of land, was the first one to recognize the ambivalence of this Sea whose function has always been to connect rather than divide
Sport and deradicalization: a proposal for an analysis and prevention model
Based on Bronfenbrennerâs (1979) ecological model, this article focus- es on the multidimensionality of radicalization and its relationship with community culture by observing the problem of social isolation. In this framework, sports pro- vide contexts in which forms of social collaboration are necessary, the ârules of the gameâ must be embraced, and there is close interaction among fellow players. These characteristics can turn organized sports into observatories on (potential) juvenile radicalization through identifying âearly warning signalsâ that are mainly detected by observing those conducts that may reveal a potential risk. In the provided extensive literature review, it comes that these signs can be traced, for instance, in the lack of self-esteem, in the absence of significant bonds, in the intolerance towards values, as well as in extreme introverted behaviour of the young subjects. Alongside such premises, this paper aims to understand whether and to what extent it is possible to hypothesize the shaping of strategies able to prevent radicalization in various con- texts. Alongside such premises, this paper is aimed at understanding whether, and to what extent, it is possible to hypothesize the shaping of strategies able to avert radicalisation in various contexts, prevention based on the idea that the interaction between the individual and the environmentâin the sense provided by the Chicago Schoolâis heavily influenced by the progressive adaptation of human organism to its surrounding environment
Editorial. Sport in the Context of Migration and Health Crises
Recent crises, from the economic and migratory to the recent COVID-19 pandemic, have dramatically affected all areas of individual and collective life â and sport and physical activity are no exception. The main aim of this special issue is to bring researchers interested in sports and physical activity to propose their works. The focus of this special issue lays in the new challenges that sociology of sports and physical activity have to face to understand these new complex scenarios, the main issues we had to face, the successes, the criticalities and the lessons learned
Analyticity Properties and Unitarity Constraints of Heavy Meson Form Factors
We derive new bounds on the b-number form factor of the B meson.
(Revised version of hep-ph/9306214).Comment: 22 page
Relativistic Description of Exclusive Semileptonic Decays of Heavy Mesons
Using quasipotential approach, we have studied exclusive semileptonic decays
of heavy mesons with the account of relativistic effects. Due to more complete
relativistic description of the quark more precise expressions for
semileptonic form factors are obtained. Various differential distributions in
exclusive semileptonic decays of heavy mesons are calculated. It is argued that
consistent account of relativistic effects and HQET motivated choice of the
parameters of quark-antiquark potential allow to get reliable value for the
ratio in the decay as well as the
ratio~. All calculated branching
ratios are in accord with available experimental data.Comment: 18 pages, LATEX, 2 figures inclosed + 4 Postscript figure
Weak Phase From Ratio of Rates
The ratio of partial decay rates for charged and neutral mesons to final states provides information on the weak phase when augmented with information on the CP-violating asymmetry
in the mode. The requirements for a useful determination of
are examined in the light of present information about the decays , , and the corresponding charge-conjugate
modes. The effects of electroweak penguins and rescattering corrections are
noted, and proposals are made for estimating and measuring their importance.Comment: 16 pages, latex, 3 figures, revised version sent to Phys. Rev.
Momentum Distribution in the Decay B-->J/psi+X
We combine the NRQCD formalism for the inclusive color singlet and octet
production of charmonium states with the parton and the ACCMM model,
respectively, and calculate the momentum distribution in the decay B-->J/psi+X.
Neglecting the kinematics of soft gluon radiation, we find that the motion of
the b quark in the bound state can account, to a large extent, for the observed
spectrum. The parton model gives a satisfactory presentation of the data,
provided that the heavy quark momentum distribution is taken to be soft. To be
explicit, we obtain epsilon_p=O(0.008-0.012) for the parameter of the Peterson
et al. distribution function. The ACCMM model can account for the data more
accurately. The preferred Fermi momentum p_F=O(0.57 GeV) is in good agreement
with recent studies of the heavy quark's kinetic energy.Comment: revised version to be published in Phys. Rev. D; 27 pages, LaTeX, 7
eps figures, uses a4wide.sty, epsfig.sty and amssymb.st
Charm production in nonresonant e(+)e(-) annihilations at âs =10.55 GeV
This is the publisher's version also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.37.1719We report results on the differential and total cross sections for inclusive production of the charmed particles D*+, D*(0), D(0), D(+), D(s), and Îc in e(+)e(-) annihilations at âs=10.55 GeV. Widely used quark fragmentation models are discussed and compared with the measured charmed-particle momentum distributions. This comparison, as well as that with measurements at other center-of-mass energies, shows the need to take QCD corrections into account and their importance for a correct interpretation of the model parameters. The observed rate of D(0) and D(+) production is compared to the expected total charm production cross section. We measure the probability of a charmed meson being produced as a vector meson and the D*(+) decay branching fraction into D(0)Ï+
A Measurement of the Cross Section in Two-Photon Processes
We have measured the inclusive production cross section in a
two-photon collision at the TRISTAN collider. The mean of
the collider was 57.16 GeV and the integrated luminosity was 150 . The
differential cross section () was obtained in the
range between 1.6 and 6.6 GeV and compared with theoretical predictions, such
as those involving direct and resolved photon processes.Comment: 8 pages, Latex format (article), figures corrected, published in
Phys. Rev. D 50 (1994) 187
Heavy Quark Symmetry Violation in Semileptonic Decays of D Mesons
The decays of mesons to and final states exhibit
significant deviations from the predictions of heavy-quark symmetry, as one
might expect since the strange quark's mass is of the same order as the QCD
scale. Nonetheless, in order to understand where the most significant effects
might lie for heavier systems (such as and ),
the pattern of these deviations is analyzed from the standpoint of perturbative
QCD and corrections. Two main effects are noted. First, the
perturbative QCD corrections lead to an overall decrease of predicted rates,
which can be understood in terms of production of excited kaonic states.
Second, effects tend to cancel the perturbative QCD
corrections in the case of decay, while they have minimal effect in
decay.Comment: 25 pages (LaTeX) + 7 pages of Postscript figures (included at end),
EFI-92-3
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