[en] The Grueneisen parameter of alkali halides is calculated by an ab initio quantum-statistical method and then compared with the experimental data. The crystal model applied assumes the crystal ions to be compressible but impenetrable spheres. The ions are described with the aid of a modified Thomas-Fermi theory with exchange. At the next step it is possible to calculate the energy needed to transform the system of the non-interacting ions into the ionic system represented by the crystal lattice. This calculation allows for an ab initio estimate of the parameters entering the Born, or the Born-Mayer, repulsive part of the crystal energy. The parameters are then used in the calculation of the Grueneisen parameter and its dependence on the crystal compression. (author)

[en] The role of coupling between two quantum wells in TE optical modal gain is analysed within the self-consistent solution of the Poisson, Schroedinger and 4x4 Luttinger-Kohn equations. The many-body effects of bandgap renormalization, coulombic scattering interactions and a non-Markovian distribution are also included. The analysis is performed for a 1.55 μm InGaAsP/InP lattice-matched system grown in the [001] direction. It shows that electrostatics significantly changes the modal gain in both amplitude and spectrum. The gain amplitude is larger when electrostatic effects are included due to better charge localization in the wells. The gain spectrum also changes due to the modification of the heterostructure potential and hence different coupling between the wells. (author). Letter-to-the-editor

[en] The LHCb detector has been designed to study CP violation and other rare phenomena in B-meson decays up to a luminosity of 5 x 10³² cm^-2s^-1. We will describe the current limitations that prevent LHCb from exploiting the much higher luminosities available at the LHC, and what modifications can be made that allow data taking at an order of magnitude higher instantaneous luminosity. The aim of the LHCb upgrade is to increase the yields in hadronic B-decay channels by about a factor twenty, while for channels with leptons in the final state a factor ten increase in statistics is envisaged. (author)

[en] This paper continues the study of the consequences of the Bjorken-Gottfried hypothesis for the HBT parameters measured in e⁺e^- annihilation. It is shown that introducing a natural cut-off for transverse momenta of emitted particles, one can describe the observed ratio of transverse and longitudinal HBT radii for pions without destroying the good description of the mass dependence of the HBT parameters for heavier particles. (author)

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[en] With the recent startup of operation at the Large Hadron Collider (LHC), the physics of the strong interaction described by the theory of Quantum Chromodynamics (QCD) explores a new territory in proton-proton and Pb-Pb collisions at energies never reached before: √(s)=7 TeV for p-p collisions and √=2.76 TeV for Pb-Pb collisions. The topics of the workshop are organized around 3 main axes: perturbative QCD (including jets, high-P_T, direct photons, heavy quarks, quarkonia,...), QCD in the non-perturbative regime (including inclusive hadron production, diffraction,...) and low-x QCD. This document gathers the slides of all the presentations

[en] In 2018, a test run with muons in the North Area at CERN was performed, running parasitically downstream of the COMPASS spectrometer. The aim of the test was to investigate the elastic interactions of muons on atomic electrons, in an experimental configuration similar to the one proposed by the project MUonE, which plans to perform a very precise measurement of the differential cross-section of the elastic interactions. COMPASS was taking data with a 190 GeV π beam, stopped in a tungsten beam dump: the muons from these π decays passed through a setup including a graphite target followed by 10 planes of Si tracker and a BGO crystal electromagnetic calorimeter placed at the end of the tracker. The elastic scattering events were selected and analysed, and compared to expectations from MonteCarlo simulation. The agreement found was satisfactory and demonstrated that measuring the angles of the outgoing particles, a clean sample of elastic interaction could be identified. (paper)

[en] The LHCb experiment has been taking data at the Large Hadron Collider (LHC) at CERN since the end of 2009. One of its key detector components is the Ring-Imaging Cherenkov (RICH) system. This provides charged particle identification over a wide momentum range, from 2-100 GeV/c. The operation and control, software, and online monitoring of the RICH system are described. The particle identification performance is presented, as measured using data from the LHC. Excellent separation of hadronic particle types (π, K, p) is achieved. (orig.)

[en] The Compact Linear Collider (CLIC) is an option for a future e"+e"- collider operating at centre-of-mass energies up to 3 TeV, providing sensitivity to a wide range of new physics phenomena and precision physics measurements at the energy frontier. This paper is the first comprehensive presentation of the Higgs physics reach of CLIC operating at three energy stages: √(s) = 350 GeV, 1.4 and 3 TeV. The initial stage of operation allows the study of Higgs boson production in Higgsstrahlung (e"+e"- → ZH) and WW-fusion (e"+e"- → Hν_e anti ν_e), resulting in precise measurements of the production cross sections, the Higgs total decay width Γ_H, and model-independent determinations of the Higgs couplings. Operation at √(s) > 1 TeV provides high-statistics samples of Higgs bosons produced through WW-fusion, enabling tight constraints on the Higgs boson couplings. Studies of the rarer processes e"+e"- → t anti tH and e"+e"- → HHν_e anti ν_e allow measurements of the top Yukawa coupling and the Higgs boson self-coupling. This paper presents detailed studies of the precision achievable with Higgs measurements at CLIC and describes the interpretation of these measurements in a global fit. (orig.)