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QCD at FAIR: A cross-community network for hadron physics
No full textThe newly launched “QCD at FAIR” network targets to address open questions in the field of non-perturbative QCD leveraging high-intensity (anti)proton, deuteron and secondary pion beams at GSI/FAIR aligned with state-of-the-art theoretical advances. The program includes precision studies of hadron–hadron interactions, baryon spectroscopy, transition form factors, and in-medium modifications under extreme conditions, with implications for the nuclear equation of state, neutron star physics, and searches for physics beyond the Standard Model. In this talk, I will present the planned physics program and the roadmap currently being consolidated in a White Paper to be released soon
The asymmetry of white dwarf double detonations and the observed scatter around the Phillips relation
No full textMeasurement of the deuteron static and oscillating electricdipole moment at the COoler SYnchrotron COSY
No full textExcited cluster states: A new source for proton number fluctuations in the high baryon density regime
No full textWe calculate the contribution of the decay products of excited nuclear cluster states to the event-by-event fluctuations of protons in the energy range from sNN=2−5 GeV within the statistical model. We find that the inclusion of the excited nuclear clusters yields corrections to all cumulant ratios, ranging from 1% for ratio of second to first-order cumulant to 100% for the sixth to second order cumulant towards the lowest inspected energy. As expected the contribution of excited cluster states is most important at low energies sNN<3.5 GeV and becomes negligible at higher collision energies. Especially in light of the expected ultra-high precision data from CBM at FAIR, this new contribution is important to allow for a quantitative comparison with (potentially later available) lattice QCD or effective model results
SOFIA Software
No full textThe SOFIA software module, integrated into the R3BRoot framework, provides comprehensive tools for configuring and managing the SOFIA detector analysis, specifically designed for nuclear fission experiments performed with the GLAD superconducting spectrometer. Sofia-R3BRoot, built on the FairRoot framework, offers a robust software environment for conducting detailed Monte Carlo simulations and processing experimental data from R3B (Reactions with Relativistic Radioactive Beams) experiments. Key features include precise detector geometry modeling, particle tracking, event reconstruction, and physics analysis, all of which support the study of fission dynamics and nuclear structure in high-energy heavy-ion collision scenarios at the GSI-FAIR facility. The SOFIA software package is distributed as a source release, with regular updates available for MacOS and Linux
Emergence of new systematics for open charm production in high energy collisions
No full textWe present the production systematics of open charm hadron yields in high-energy collisions and their description based on the Statistical Hadronization Model of charm (SHMc). The rapidity density of D0, D+, D*+, mesons and baryons in heavy ion and proton-proton collisions is analyzed for different collision energies and centralities. The SHMc is extended to open charm production in minimum-bias and high-multiplicity pp collisions. In this context, we use the link established in [1, 2], between the rapidity density of open charm hadron yields, dNi/dy, and the rapidity density of charm-anticharm quark pairs, . We demonstrate that, in pp, pA and AA collisions, dNi/dy scales in leading order with and for open charm mesons, D0, D+ and D*+ the slope coefficient is quantified by the appropriate thermal density ratio calculated in the SHMc at the chiral crossover temperature, Tc = 156.5 MeV. The slope coefficient for differs at Tc by a factor of 1.97 ± 0.14 which is attributed to missing charmed-baryon resonances in the PDG. It is also shown that dNi/dy exhibits power-law scaling with the charged-particle pseudo-rapidity density in high energy collisions and within uncertainties. Furthermore, presently available data on different ratios of open charm rapidity densities in high-energy collisions are independent of collision energy and system size, as expected in the SHMc
Gluon mass scale through the Schwinger mechanism
No full textIt has long been argued that the action of the Schwinger mechanism in the gauge sector of Quantum Chromodynamics leads to the generation of a gluon mass scale. Within this scenario, the analytic structure of the fundamental vertices is modified by the creation of scalar colored excitations with vanishing mass. In the limit of zero momentum transfer, these terms act as massless poles, providing the required conditions for the infrared stabilization of the gluon propagator, and producing a characteristic displacement to the associated Ward identities. In this article we offer an extensive overview of the salient notions and techniques underlying this dynamical picture. We place particular emphasis on recent developments related to the exact renormalization of the mass, the nonlinear nature of the pole equation, and the key role played by the Fredholm alternative theorem
