Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 77: QCD II
T 77.2: Vortrag
Donnerstag, 18. März 2021, 16:15–16:30, Tb
Event shape analysis in deep-inelastic e±p scattering — •Johannes Hessler, Daniel Britzger, Stefan Kluth, and Andrii Verbytskiy — Max Planck Institut für Physik, München
Event shape observables are sensitive to the strong coupling constant αs and parton distribution functions (PDFs). A new measurement of the 1-jettiness observable τ1b in neutral-current deep-inelastic scattering will be performed. Data from the H1 experiment at the HERA electron-proton collider at DESY will be used. The data was taken in the years 2003 to 2007. It includes electron-proton and positron-proton scattering. Due to momentum conservation τ1b has an analogy to the observable thrust. Precise theoretical calculations are available for τ1b. The observable is defined in the Breit frame. Only the hadronic final state in the current hemisphere contributes. A triple differential measurement in the observables τ1b, xBj (momentum fraction of the scattered parton) and Q2 (virtuality of the exchanged boson) will be performed. The sensitivity to the strong coupling constant αs and to proton PDFs are explored. In the talk preliminary results for the triple-differential cross section measurement will be presented.