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[en] The imaginary potential and entropic force are two important different mechanisms to characterize the dissociation of heavy quarkonia. In this paper, we calculate these two quantities in strongly coupled theories with anisotropic Lifshitz scaling and hyperscaling violation exponent using holographic methods. We study how the results are affected by the hyperscaling violation parameter and the dynamical exponent z at finite temperature and chemical potential. Also, we investigate the effect of the chemical potential on these quantities. As a result, we find that both mechanisms show the same results: the thermal width and the dissociation length decrease as the dynamical exponent and chemical potential increase or as the hyperscaling violating parameter decreases.
[en] We present a brief overview of the most relevant current issues related to quarkonium production in high energy proton-proton and proton-nucleus collisions along with some perspectives. After reviewing recent experimental and theoretical results on quarkonium production in pp and pA collisions, we discuss the emerging field of polarization studies. Afterwards, we report on issues related to heavy-quark production, both in pp and pA collisions, complemented by AA collisions. To put the work in broader perpectives, we emphasize the need for new observables to investigate the quarkonium production mechanisms and reiterate the qualities that make quarkonia a unique tool for many investigations in particle and nuclear physics.
[en] It is pointed out that in models of quark confinement the usual analysis of spin dependent forces in terms of scalar or vector potentials may be inappropriate. The special role that the self energy plays in such models and its consequences for heavy quarkonia are discussed
[en] The analysis of data collected by the CMS experiment in 2010 (equivalent to an integrated luminosity of 40 pb-1) has yielded several physics results concerning the production mechanisms of heavy flavors at the unprecedented center-of-mass energy of 7TeV. Reconstruction techniques of heavy-flavored particles will be discussed, with particular focus on the triggers expressly designed to select them. Measurements of the bb cross-section both with jet 'b-tagging' techniques and exclusive states, such as B0, B+- and B0s, will be presented, along with comparisons with theoretical predictions. Charmonium and bottomonium cross-section measurements, as well as the first determinations of the B-decay feed-down fraction for J/ψ, will be shown.