Hadronfizika a CMS detektorral = Hadronic physics at the CMS experiment

A CERN CMS kiserleteben kifejlesztettuk a toltott reszecskek nyomkovetesenek kis tevesztesű, nagyon kis impulzus eseten is jo hatasfoku modszeret. A sziliciumdetektorokban leadott energia, valamint a bomlasi topologia figyelembe vetelevel kidolgoztuk a toltott es semleges reszecskek azonositasanak technikajat. Megmutattuk, hogy uj matematikai eszkozokkel a semleges pionok spektruma az egyfoton eloszlasbol visszafejthető. A fenti eszkozok segitsegevel elkeszitettuk a 0.9-7-10 TeV-es proton-proton utkozesekben keletkezett hadronok szamaval es eloszlasaval foglalkozo pelda-analiziseket, melyek a 2009-es ev vegen a CMS kiserlet első publikacioi lesznek. A Pb-Pb utkozesben keletkezett anyagon athalado partonok energiavesztesegenek vizsgalatahoz kidolgoztuk a nuklearis elnyomasi faktorok meresenek modszeret, nagy transzverzalis impulzusokra, amely csak jet triggerek alkalmazasaval erhető el. A modszerrel varhatoan tobbszorosere nő majd az az impulzustartomany, ahol a meres elvegezhető. Letrehoztunk egy megbizhato, szcintillatorokon alapulo triggert, amely az első nehezion meresek alapvető triggere lehet 2010-ben. | Working in the CERN CMS experiment we have developed a new method of charged particle tracking that has good efficiency even at very low momentum. With help of the measured energy deposited in the silicon detectors, as well as by using the decay topology, we have worked out a technique of particle identification of charged and neutral hadrons. We have shown that with new mathematical methods the spectrum of neutral pions can be extracted from that of the photons. The above mentioned tools enabled us to prepare and accomplish the example analyses dealing with the measurement of the number distribution and momentum spectrum of hadrons produced in proton-proton collisions at 0.9-7-10 TeV. They will be the first publications of the CMS Collaboration at the end of 2009. For the study of energy loss of partons produced in Pb-Pb collisions, we have developed a method to measure the nuclear modification factors, for high transverse momenta. It was possible with help of jet triggers which multipled the reach of the measurement. We have created a reliable, scintillator based trigger, that can be a basic trigger for the first heavy ion collisions in 2010.