Small eigenvalues of the low temperature linear relaxation Boltzmann equation with a confining potential

We study the linear relaxation Boltzmann equation, a simple semiclassical kinetic model. We provide a resolvent estimate for an associated non-selfadjoint operator as well as an estimate on the return to equilibrium. This is done using a scaling argument and non-semiclassical hypocoercive estimate.Comment: 17 page

Non-leptonic charmless Bc decays and their search at LHCb

We discuss the decay of Bc mesons into two light mesons (pi, K^(*), eta', rho, omega, phi). All these decay channels come from a single type of diagram, namely tree annihilation. This allows us to derive extremely simple SU(3) relations among these processes. The size of annihilation contributions is an important issue in B physics, and we provide two different estimates in the case of non-leptonic charmless Bc decays, either a comparison with annihilation decays of heavy-light mesons or a perturbative model inspired by QCD factorisation. We finally discuss a possible search for these channels at LHCb.Comment: 22 pages, 1 figur

RecoNoC: a reconfigurable network-on-chip

This article presents the design of RecoNoC: a compact, highly flexible FPGA-based network-on-chip (NoC), that can be easily adapted for various experiments. In this work, we enhanced this NoC with dynamically reconfigurable shortcuts. These can be used to alter the NoC's topology to adapt to the system's communication needs. The design has been implemented and tested on a Xilinx Virtex-2 Pro FPGA, using the TMAP dynamic datafolding toolflow to automatically generate the reconfigurable hardware and the software reconfiguration procedures. The results show that, using dynamic datafolding, the overhead of introducing this shortcut mechanism is limited

Prompt Jpsi and b->Jpsi X production in pp collisions

International audienceThe LHCb measurement of the J/ψ production cross-section is presented. The double differential cross-section is measured as a function of the J/ψ transverse momentum pT and of the J/ψ rapidity y in the fiducial region pT∈[0;14],GeV/c and y∈[2.0;4.5]. The analysis is based on a sample of 5.2 pb−1 collected in September 2010 at the pp Large Hadron Collider at CERN, at a centre-of-mass energy of s = 7TeV. The contributions from prompt J/ψ and J/ψ from b are separated using the J/ψ pseudo-proper time