Abstract:

The physics performance of the second generation B-physics experiments, LHCb, BTeV, ATLAS and CMS, is reviewed. The differences in detector philosophies, the CP-reach of the experiments, and the sensitivities to rare B decays are compared.

Abstract:

Measurements of the proton structure function F2 for 0.6 < Q2 < 17 GeV2 and 1.2 × 10-5 < cursive Greek chi < 1.9 × 10 -3 from ZEUS 1995 shifted vertex data are presented. From ZEUS F2 data the slopes dF2/d ln Q2 at fixed cursive Greek chi and din F2/d ln(1/cursive Greek chi) for cursive Greek chi < 0.01 at fixed Q2 are derived. For the latter, E665 data are also used. The transition region in Q2 is explored using the simplest non-perturbative models and NLO QCD. The data at very low Q2 ≤ 0.65 GeV2 are described successfully by a combination of generalised vector meson dominance and Regge theory. From a NLO QCD fit to ZEUS data the gluon density in the proton is extracted in the range 3 × 10-5 < cursive Greek chi < 0.7. Data from NMC and BCDMS constrain the fit at large cursive Greek chi. Assuming the NLO QCD description to be valid down to Q2 ∼ 1 GeV2, it is found that the qq̄ sea distribution is still rising at small cursive Greek chi and the lowest Q2 values whereas the gluon distribution is strongly suppressed.

Abstract:

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.