Meson Mixing and Dilepton Production in Heavy Ion Collisions

We study the possibility of $\rho-a_0$ mixing via N-N excitations in dense nuclear matter. This mixing is found to induce a peak in the dilepton spectra at an invariant mass equal to that of the $a_0$. We calculate the cross section for dilepton production through mixing and we compare its size with that of $\pi-\pi$ annihilation. In-medium masses and mixing angles are also calculated. Some preliminary results of the mixing effect on the dilepton production rates at finite temperature are also presented.Comment: To be published in the proceedings of CIPANP 200

Squeezing lepton pairs out of broken symmetries

We discuss two possible signatures of symmetry breaking that can appear in dilepton spectra, as measured in relativistic heavy ion collisions. The first involves scalar-vector meson mixing and is related to the breaking of Lorentz symmetry by a hot medium. The second is related to the breaking of Furry's theorem by a charged quark-gluon plasma. Those signals will be accessible to upcoming measurements to be performed at the GSI, RHIC, and the LHC.Comment: 5 pages, 4 figures, talk given at the INPC 2001 (International Conference on Nuclear Physics), 30 July - 3 August 2001, Berkeley, C

The Relationship Between the Sociology of Christian Religion and the Metaphysics of Morality

The objective reality of the moral Christian act is composed of four structural elements of social organization: 1. the individual human subject; 2. its manifestation as a concrete act; 3. the moral rules of the Scripture and 4. the Holy Spirit, the informational energy of Divinity, which binds the first three structural elements into a unitary whole through the mediation of the individual human consciousness.The implementation of the social moral act in the religious experience can be achieved by adopting a paradigmatic model whereby an attempt is made at an empirical match between the practical social aspects of morality and the objective existence of the real social system of humanity, integrated in the structure of the universe as a whole, through the intermediary of the uncreated informational energy of the Holy Spirit

Aspects of meson properties in dense nuclear matter

We investigate the modification of meson spectral densities in dense nuclear matter at zero temperature. These effects are studied in a fully relativistic mean field model which goes beyond the linear density approximation and also includes baryon resonances. In particular, the role of N*(1520) and N*(1720) on the rho meson spectral density is highlighted. Even though the nucleon-nucleon loop and the nucleon-resonance loop contribute with the opposite sign, an overall reduction of rho meson mass is still observed at high density. Importantly, it is shown that the resonances cause substantial broadening of the rho meson spectral density in matter and also induces non-trivial momentum dependence. The spectral density of the a0 meson is also shown. We study the dispersion relations and collective oscillations induced by the rho meson propagation in nuclear matter together with the influence of the mixing of rho with the a0 meson. The relevant expression for the plasma frequency is also recovered analytically in the appropriate limit.Comment: 19 pages, 17 figure

Tirosyne Kinase Inhibithors (TKIs) in the Treatment of Non –Small Cell Lung Cancer (NSCLC), Practical Pharmacological Aspects

Tyrosine Kinase Inhibitors are new drugs developed in the last decade. For Non-Small Cell Lung Cancer this drug brought more hope for patients with this disease. Also TKIs are better tolerated then chemotherapy. The efficacy of TKIs is dependent of the presence of Epidermal Grows Factor Receptor gene mutation. This mutation account for about 9% of patients with lung cancer in Europe. This short review try to give the minimal knowledge to clinicians, especially medical oncologists, about mechanism of action, pharmacokinetics of TKIs used in the treatment NSCLC. Keywords: Tyrosine Kinase Inhibitors (TKI); Non -Small Cell Lung Cancer; Pharmacokinetics aspect

An ‘Ethical Black Box’, Learning From Disagreement in Shared Control Systems

Shared control, where a human user cooperates with an algorithm to operate a device, has the potential to greatly expand access to powered mobility, but also raises unique ethical challenges. A shared-control wheelchair may perform actions that do not reflect its user’s intent in order to protect their safety, causing frustration or distrust in the process. Unlike physical accidents there is currently no framework for investigating or adjudicating these events, leading to a reduced capability to improve the shared control algorithm’s user experience. In this paper we suggest a system based on the idea of an ‘ethical black box’ that records the sensor context of sub-critical disagreements and collision risks in order to allow human investigators to examine them in retrospect and assess whether the algorithm has taken control from the user without justification

The effects of meson mixing on dilepton spectra

The effect of scalar and vector meson mixing on the dilepton radiation from hot and dense hadronic matter is estimated in different isospin channels. In particular, we study the effect of $\sigma$-$\omega$ and $\rho-a_0$ mixing and calculate the corresponding rates. Effects are found to be significant compared to standard $\pi$-$\pi$ and $K$-${\bar K}$ annihilations. While the mixing in the isoscalar channel mostly gives a contribution in the invariant mass range between the two-pion threshold and the $\omega$ peak, the isovector channel mixing induces an additional peak just below that of the $\phi$. Experimentally, the dilepton signals from $\rho$-$a_0$ mixing seem to be more tractable than those from $\sigma$-$\omega$ mixing.Comment: 10 pages, 9 figure