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Four-quark scatterings in QCD III
No full textWe study the full infrared dynamics of 2+1 flavor quantum chromodynamics (QCD) with the functional renormalization group approach. We resolve self-consistently the glue dynamics as well as the dynamics of chiral symmetry breaking. The computation hosts no phenomenological parameter or external input. The only ultraviolet input parameters are the physical ones in QCD: the light and strange quark masses. They are adjusted to the physical ratios of the pion and kaon masses, divided by the pion decay constant. The results for other observables of current first-principles computations are in quantitative agreement with the physical ones. This work completes the series of papers, initiated and furthered in [SciPost Phys. 14, 069 (2023); SciPost Phys. 17, 148 (2024)], on dynamical chiral symmetry breaking and the emergence of mesonic bound states within the functional renormalization group. As a first application we discuss the formation of light mesonic bound states. Among other applications such as the phase structure of QCD, the current work paves the way for studying QCD parton distribution functions within the functional renormalization group approach to first-principles QCD
Strong Electromagnetic Fields in Heavy Ion Collisions
No full textPhotons play a pivotal role in both theoretical and applied physics, ranging from elementary particle studies to practical technologies. This article explores how ultra-peripheral collisions of heavy ions act as sources of nearly real photons, enabling the investigation of a wide range of photon-induced processes. By applying the equivalent photon approximation, one can study nuclear structure, QED phenomena, and potential new physics, all in a backgroundsuppressed environment
Low-energy Measurement of the Reaction Cross Section and Its Impact on Weak R -process Nucleosynthesis
No full textIn-beam performance of neutron irradiated MIMOSIS-1 CMOS Monolithic Active Pixel Sensors
No full textMIMOSIS is the CMOS Monolithic Active Pixel Sensor designed for the Micro Vertex Detector (MVD) of the Compressed Baryonic Matter (CBM) experiment currently under development at FAIR. The sensors have to combine a spatial and a time resolution of 5 mu m and 5 mu s, handle a peak hit rate of similar to 80 MHz/cm(2), and to withstand Total Ionizing radiation Doses (TID) of similar to 5 MRad and Non-Ionizing Energy Loss (NIEL) fluences of similar to 7 x 10(13) n(eq)/cm(2) before being replaced. Prior to their use in the experiment, the sensors undergo lab and in-beam tests, to qualify their performance in charged particles detection. In this work we present the sensor design and concept, a summary of its requirements as a candidate for the CBM-MVD, followed by the performance results of the first full-size prototype, MIMOSIS-1, from in-beam tests done at DESY and CERN, after being irradiated to different TID and NIEL fluences
