Projects / Programmes
Determination of the performance of the RICH counter for the HERA-B experiment
| Code |
Science |
Field |
Subfield |
| 1.02.06 |
Natural sciences and mathematics |
Physics |
Experimental physics of elementary particles |
| Code |
Science |
Field |
| P210 |
Natural sciences and mathematics |
Elementary particle physics, quantum field theory |
| P211 |
Natural sciences and mathematics |
High energy interactions, cosmic rays |
Ring Imaging Cherenkov Counter, CP Symmetry, B mesons
Researchers (1)
| no. |
Code |
Name and surname |
Research area |
Role |
Period |
No. of publicationsNo. of publications |
| 1. |
10650 |
PhD Tomi Živko |
Physics |
Head |
1998 - 2001 |
196 |
Organisations (1)
| no. |
Code |
Research organisation |
City |
Registration number |
No. of publicationsNo. of publications |
| 1. |
0106 |
Jožef Stefan Institute |
Ljubljana |
5051606000 |
90,753 |
Abstract
One of the most interesting observations in particle physics is the violation of CP symmetry in decays of neutral kaons. Measurement of CP violation in system of $B$ mesons could substantially improve our understanding of the phenomenon and would be an important test of the Standard Model. The experiment HERA-B which will enable the measurement is in the final stage of construction.
The most promising decay channel for the CP measurement is decay of neutral meson $B$ to $J/Đpsi K_SČ0$. Because both of neutral mesons $B$ are allowed to decay to $J/Đpsi K_SČ0$, it has to be determined which of them actually decayed to this final state. The companion $B$ meson has the opposite flavour and we can determine it through charge of kaon from its decay chain. Namely, positively charged kaons are more frequent in the decay chains of $BČ0$ while negatively charged kaons are more frequent in decay chains of $ĐbaršBČ0ć$. For identification of kaons at the HERA-B experiment we shall use Ring Imaging Cherenkov detector. The elemnts of the RICH counter are a radiator, a mirror, a photon detector and a read-out system. The Cherenkov angle and consequently velocity of the charged particle can be deduced from the radius of ring. Comparing it with the particle''s momentum that is measured in tracking system the identity of charged particle can be determined. At the experiment HERA-B we expect enormous number of charged particles in final state what substantially complicates analysys of picture on the photon detector.
The main aim of the project is development and test of methods for separation between kaons and other charged particles using RICH as well as the determination of influence of the RICH construction parameters on the efficiency of the method.
In the first part of the project we developed and successfully tested on the simulated data several methods for identification of charged particles and for search of Cherenkov rings.
