Study of pi+pi-, K+K-, ppbar and pi+pi+pi-pi- production in central exclusive processes with the STAR detector at RHIC
Studie produkce pi+pi-, K+K-, ppbar a pi+pi+pi-pi- v centrálních exkluzivních procesech s detektorem STAR na RHIC
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České vysoké učení technické v Praze
Czech Technical University in Prague
Czech Technical University in Prague
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Tato práce se zabývá prvním měřením centrální exkluzivní produkce v proton-protonových srážkách při energii sqrt s = 510 GeV naměřených na experimentu STAR. Při této energie dominuje dvojitá výměna pomeronů. Z toho důvodu jsou tyto srážky velmi slibné pro hledání vázaných stavů gluonů, glueballů. Experimentální potvrzení jejich existence by silně podpořilo platnost kvantové chromodynamiky. Difrakčně rozptýlené protony pohybující se neporušeny uvnitř svazkové trubice byly změřeny pomocí detektorů Roman Pot, což umožnilo plnou kontrolu nad kinematikou interakce a tedy ověření exkluzivity. První výsledky ve formě distribuce invariantní hmotnosti centrálně produkovaných pi+pi-, K+K− a ppbar párů jsou prezentovány v této práci.
This thesis is dedicated to the first measurement of the central exclusive production process in proton-proton collisions at RHIC with the STAR detector at sqrt s = 510 GeV. At this energy, this process is dominated by a Double Pomeron Exchange mechanism. Therefore, it is very promising for the search of gluon bound states, glueballs. The experimental confirmation of their existence would be yet another strong support for the validity of the quantum chromodynamics theory. The diffractively scattered protons, moving intact inside the RHIC beam pipe after the collision, were measured in the Roman Pots system allowing full control of the interaction’s kinematics, and thus verification of the exclusivity. The preliminary results on the invariant mass distributions of centrally exclusively produced pi+pi−, K+K− and ppbar pairs measured within the STAR acceptance are presented in this thesis.
This thesis is dedicated to the first measurement of the central exclusive production process in proton-proton collisions at RHIC with the STAR detector at sqrt s = 510 GeV. At this energy, this process is dominated by a Double Pomeron Exchange mechanism. Therefore, it is very promising for the search of gluon bound states, glueballs. The experimental confirmation of their existence would be yet another strong support for the validity of the quantum chromodynamics theory. The diffractively scattered protons, moving intact inside the RHIC beam pipe after the collision, were measured in the Roman Pots system allowing full control of the interaction’s kinematics, and thus verification of the exclusivity. The preliminary results on the invariant mass distributions of centrally exclusively produced pi+pi−, K+K− and ppbar pairs measured within the STAR acceptance are presented in this thesis.