On December 2017 Consortium of two universities - RTU and UL joined the CMS experiment. Following areas of collaboration have been identified:
The Compact Muon Solenoid (CMS) experiment was created to:
A significant part of the research is on the top quark, the heaviest of all known particles. Its decay triggers many interesting physics processes.
The detector relies on a 4T magnetic field created by a superconducting solenoid. The ratio of the stored energy in the magnetic field to its mass is the largest among all detectors - it is a compact solenoid. The muons are created in many elementary particle processes and they are relatively simple to observe.
The CMS detector covers the point of interaction from all angles. Its different subdetectors are arranged in radial layers like in an onion.
The silicon tracker sits in the innermost layer. While traversing the tracker charged particles leave signals in silicon cells. The particle trajectory is reconstructed and the interaction point determined by connecting the activated cells
The next layer is the electromagnetic calorimeter which measures the electron and photon energy. It consists of scintillating crystals. The light energy generated by absorbed electrons and photons is measured by photodiodes.
Hadron energy is measured in the hadron calorimeter. The hadrons are absorbed in the brass layer, producing a hadron jet. The jet of hadrons induces a glow in a scintillating plastic material. The energy in this light is measured by photodiodes.
The tracker and the calorimeters are surrounded by a superconducting solenoid, which sets up a uniform magnetic field. The solenoid is cooled to a temperature of 4.5 K. The charged particles are deflected in the magnetic field. From the deflection the momentum of these particles can be measured.
Muons which are similar to electrons but much heavier elementary particles, pass through all of these layers and their trajectories are observed in the muon chambers. The muon chambers are filled with gas that is ionised when its atoms collide with the muons passing through the camera. The electric field in the chamber accelerates ions. When ions reach the electrodes, the signal for reconstructing the trajectory of the muons is generated.
The neutrino passes through all the layers of the detector without leaving any signal. We can infer about the existence of the neutrino only from the observation that they carry away a fraction of the energy and momentum.
The CMS experiment collects 5 petabytes of data a year. Their storage and processing are spread across the Worldwide Large Hadron Collider Computing Grid.
CMS is one of the four major experiments of the Large Hadron Collider. It is run by around 4,000 scientists, engineers and students from around 200 different institutes and universities in approximately 40 countries worldwide.
RTU participates in the top quark physics group, undertaking a study of colour flow in top quark pair decays.