BORIS Theses

BORIS Theses
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Automated Transverse Momentum Resummation for Electroweak Boson Production

Hager, Monika (2019). Automated Transverse Momentum Resummation for Electroweak Boson Production. (Thesis). Universität Bern, Bern

19hager_m.pdf - Thesis
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The production of electroweak bosons, followed by leptonic decays, is among the most basic hard-scattering processes studied at hadron colliders. Such processes provide backgrounds to new physics searches, enable the study of possible anomalous gauge couplings and provide spectra for determining the W boson mass and the angle θW. At small transverse momentum qT , the electroweak boson production processes involve disparate scales, namely the small qT and the large mass M of the bosonic states. Fixed-order perturbative results suffer from large logarithms of the ratio of these scales and hence become unreliable. The appropriate treatment of these logarithms is their resummation. This thesis presents a framework for transverse momentum resummation for quark-induced boson production processes with arbitrary electroweak final states. The resummation is performed in an automated way and is based on reweighting events generated using a tree-level event generator. The kinematics of the electroweak final states are accessible, and this allows for the analysis of general observables in the small transverse momentum region. Making use of the event generator MadGraph5_aMC@NLO, the resummation is implemented at next-to-next-to-leading logarithmic accuracy and matched to next-to-leading fixed-order results. Results for Z and W boson production with leptonic decay as well as for WZ production are presented. The predictions are validated using an existing resummation code and compared to experimental measurements.

Item Type: Thesis
Dissertation Type: Single
Date of Defense: 4 June 2019
Subjects: 500 Science > 530 Physics
Institute / Center: 08 Faculty of Science > Institute of Theoretical Physics
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
Depositing User: Hammer Igor
Date Deposited: 10 Sep 2019 07:49
Last Modified: 11 Nov 2019 18:16

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