Essays about: "NNLO"
Found 5 essays containing the word NNLO.
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1. Studies of the axial-vector transition form factors of the process Ω− → W−Ξ0 in chiral perturbation theory
University essay from Uppsala universitet/KärnfysikAbstract : This work is included in a broader research of the hadron theory group of Uppsala University and its collaborators tackling the quest for an understanding of the quark distribution inside hadrons by joining threedifferent approaches of QCD namely chiral perturbation theory, dispersion theory and lattice QCD. This thesis contributes by computing in chiral perturbation theory, the quark-masses dependence of form factors. READ MORE
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2. On the vector transition form factors in the Ω- → Ξ0 W- decay
University essay from Uppsala universitet/KärnfysikAbstract : To learn more about the structure of hadrons we study form factors. In the semi-leptonic decay Ω- → Ξ0W- two types of form factors arise namely the vector and axial-vector transition form factors. READ MORE
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3. Fitting the pion and kaon mass and decay constant to lattice data
University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationAbstract : We use lattice QCD data to perform a fit of the pion and kaon mass and decay constant to next-to-next-to-leading order (NNLO) in three-flavor Chiral Perturbation Theory (ChPT). To improve our fits, we make use of finite volume corrections at both one- and two-loop order. This turns out to provide a small but noticeable improvement of our fits. READ MORE
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4. Fitting the three loop pion mass and decay constant to lattice data
University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationAbstract : We perform a fit to three loop order (NNNLO) in Chiral perturbation theory of the pion mass and decay constant. In particular we investigate if the NNNLO fit is an improvement of the fit to two loop order (NNLO) to lattice QCD data, which was done in a lattice gauge group collaboration. READ MORE
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5. Transverse Momentum Dependent Soft Function in SCET to NNLO
University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisationAbstract : We review the factorization theorem for the production of a heavy color-neutral final state with a transverse momentum much smaller than its invariant mass in the framework of soft collinear effective field theory (SCET). This phase space region is plagued by large logarithms of widely separated scales, including large logarithms of rapidity ratios, that need to be resummed for sensible results. READ MORE
