Inclusive V0V^0 Production Cross Sections from 920 GeV Fixed Target Proton-Nucleus Collisions

Inclusive differential cross sections $d\sigma_{pA}/dx_F$ and $d\sigma_{pA}/dp_t^2$ for the production of \kzeros, \lambdazero, and \antilambda particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to $\sqrt {s} = 41.6$ GeV in the proton-nucleon system. The ratios of differential cross sections \rklpa and \rllpa are measured to be $6.2\pm 0.5$ and $0.66\pm 0.07$, respectively, for \xf $\approx-0.06$. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions $d\sigma_{pA}/dp_t^2$ also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections $\sigma_{pA}$ on the atomic mass $A$ of the target material is discussed, and the deduced cross sections per nucleon $\sigma_{pN}$ are compared with results obtained at other energies.Comment: 17 pages, 7 figures, 5 table

Design of a prototype frontend and bias generator for a new readout chip for LHCb

This paper presents the design and simulation results of components for a new LHCb readout chip for the silicon vertex detector, the inner tracking system, the pile-up veto trigger and the RICH. It is planned to use the same readout chip for these subdetectors. However, different versions of the analog input stages might be developed depending on the choice of the detector type.In section 1, the specification of the new readout chip named Beetle with respect to the different subdetector systems is described. Sections 2 and 3 describe the design and the simulation results of two test chips. The first chip contains different types of frontends for the vertex detector and the second chip bias generators. Section 4 gives a brief overview on the future plans for the development towards a readout chip for LHCb

Beetle - a radiation hard readout chip for the LHCb experiment

A new radiation hard pipelined readout chip is being developed for the LHCb-experiment. Appropriate design measures have been taken to ensure the radiation hardness against total ionising dose effects in excess of 45 Mrad, as well as radiation effects induced by single particles. (C) 2003 Elsevier B.V. All rights reserved

Species diversification – which species should we use?

Large detector systems for particle and astroparticle physics; Particle tracking detectors; Gaseous detectors; Calorimeters; Cherenkov detectors; Particle identification methods; Photon detectors for UV. visible and IR photons; Detector alignment and calibration methods; Detector cooling and thermo-stabilization; Detector design and construction technologies and materials. The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems. as established by test beam measurements and simulation studies. is described. © 2008 IOP Publishing Ltd and SISSA

Parameterisation of radiation effects on CVD diamond for proton irradiation

The paper reviews measurements of the radiation hardness of CVD diamond for 24 GeV/c proton irradiation at fluences up to $5 \times 10^{15}$ protons/cm$^2$ . The results not only show radiation damage but also an annealing effect that is dominant at levels around %10^{15}$protons/cm$^2$ . A model describing both effects is introduced, enabling a prediction of the distribution curve of the charge signal for other levels

Charm, beauty and charmonium production at HERA-B

HERA-B is a fixed target experiment working on the 920 GeV proton beam of the HERA accelerator at the DESY laboratory in Hamburg. During the last data taking period (2002-2003), about 150 million dilepton triggers, 220 million minimum bias events and 35 million hard photon triggers were acquired. These large statistics allow detailed studies on the production of charmonium states in proton-nucleus p-A collisions, which extend for the first time into the negative Feynman-x (xF) region. Measurements of the inclusive b (b) over bar. and open charm cross sections are also ongoing. After a brief discussion of the detector and of the data samples, we report on preliminary results obtained on these physics topics