CMS is a general-purpose detector designed for use in the large hadron collider (LHC) at CERN. The electromagnetic calorimeter will play an important role in electron and photon energy measurements. The benchmark process to evaluate and optimize its performance is H −→ γγ in the intermediate mass range (90 < mH < 150 GeV). For this purpose, each element of the readout chain has to be optimized....

Theoretical analysis and Computer simulations have proven to be cost-effective and powerful tools in scientific studies of materials, particularly at nano-scale where synthesis of nano-structures, interpretation of their observed character and exploration of new structures are not always straight forward. We present here fundamental principles of techniques used today for computational simulati...

The light produced in each of the 60 thousand PbWO4 (PWO) crystals of the CMS barrel electromagnetic calorimeter will be readout by Avalanche Photodiodes (APD). The ratio detected to emitted photons also depends on the PWO//APD gluing quality that must be checked before the crystal mounting inside the calorimeter. In this paper two different tools are proposed: one for the visual inspection of ...

A beam line for electrons with energies in the range of 1 to 45 GeV, low contamination of hadrons and muons and high intensity up to 10 per accelerator spill at 27 GeV was setup at U70 accelerator in Protvino, Russia. A beam tagging system based on drift chambers with 160 μm resolution was able to measure relative electron beam momentum precisely. The resolution σp/p was 0.13% at 45 GeV where m...

An experimental program to study η rare decays with high precision and high statistics has been under development at Jefferson Lab with a 12 GeV energy upgrade to test fundamental symmetries of QCD. The first suggested experiment is to measure η → π0γγ and η → π0π0 channels simultaneously in Hall D. Three experimental techniques will be used to obtain the desired precision and statistics. This ...