Determination of alpha_s via the Differential 2-Jet-Rate

with ATLAS at LHC

Markus Lichtnecker (Autor)

Buch | Softcover

128 Seiten

2011
Südwestdeutscher Verlag für Hochschulschriften
978-3-8381-2861-0 (ISBN)

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The first determination of the strong coupling constant alpha_s via the differential 2-jet-rate in pp collisions at the LHC (at a center-of-mass-energy of 7 TeV) is presented. Data gathered by the ATLAS experiment are fitted by next-to-leading order (NLO) perturbative QCD predictions from calculations with the program NLOJET++. As an observable, the jet-flip-parameter from 3 to 2 reconstructed jets is investigated, using the infrared and collinear safe kT jet algorithm in the exclusive reconstruction mode. The jet-flip-parameters from real data are compared to simulated data from Monte Carlo generators. For the determination of alpha_s, real data have been corrected for the jet-energy-scale, whereas the calculations from NLOJET++ have been corrected for the influence of hadronization effects as well as the impact of the Underlying Event by applying bin-by-bin corrections. The fit between real data and the calculations from NLOJET++ yields a value of alpha_s(M_Z) = 0.120±0.001(stat.)±0.005(syst.), which is in very good agreement with the current world average.

Lichtnecker, MarkusDr. rer. nat. Markus Lichtnecker was born in the year 1984. He studied Physics at the Ludwig-Maximilians-Universität in Munich, Germany. After his diploma he did his PhD at the LMU with researches at CERN, Switzerland.

Sprache	deutsch
Gewicht	207 g
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
Schlagworte	2-jet-rate • 3-jet-rate • alpha_s • alphas • Atlas • ATLAS-Experiment • CERN • LHC • paticle physics • QCD • starke Kopplungskonstante • Strong Coupling Constant • Teilchenphysik
ISBN-10	3-8381-2861-3 / 3838128613
ISBN-13	978-3-8381-2861-0 / 9783838128610
Zustand	Neuware