Reports

This reports summarises the activities of the CBM Collaboration in the year 2020..

This note presents optimization results for an injector with a super-conducting gun for the cw operation of the European XFEL, the corresponding start-to-end simulation calculations for the beam transport to the undulators and SASE calculations of the X-ray intensities for the achievable photon energies.The optimizations for an injector with a super-conducting gun are done mainly for an already experimentally shown accelerating gradient of 40 MV/m. Different working points with respect to transverse emittance and bunch length are chosen to see whether the lower transverse emittance of the longer bunches survives the necessary stronger bunch compression to achieve comparable peak currents in the undulators. [...]

A detailed guidance of the approval workflow for the DESY Hamburg Theory group: Explanations of the combined procedure for DESY Red Reports preceding Journal publication..

A detailed guidance of the approval workflow at DESY..

THE INDUSTRIAL CHALLENGE: Foreign particles (inclusions) in steel, originating from early stages in the steel production process may reduce mechanical properties. As a world leading steel producer SSAB constantly strives to improve the cleanliness of the steel and one key is improved methods for the detection and quantification of inclusions [...]

A combination of measurements of Higgs boson production cross sections and branching fractions is presented. The combination is based on the analyses of the Higgs boson decay modes $H \to \gamma\gamma$, $ZZ^\ast$, $WW^\ast$, $\tau\tau$, $b\bar{b}$, $\mu\mu$, and searches for decays into invisible final states. [...]

The computing and software project in ATLAS exists to enable the Collaboration to fully exploit the LHC physics programme, while respecting the budgetary constraints associated with computing. This Conceptual Design Report summarises the current approaches being taken and plans being developed within ATLAS to meet the challenges of the HL-LHC era. [...]

Inclusive, differential and production mode cross sections of the Higgs boson are measured in the $H \to ZZ^{*} \to 4\ell$ decay channel. Additionally, cross sections are measured for the main production modes in several exclusive regions of the Higgs boson production phase space. [...]

Combined measurements of the total and differential cross sections of Higgs boson production are performed with proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider. The data correspond to an integrated luminosity of 139 $\textrm{fb}^{-1}$ produced at a center-of-mass energy of 13 TeV. [...]