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Radiative Width of K*(892) from Lattice Quantum Chromodynamics
Radhakrishnan, Archana
Radhakrishnan, Archana
Abstract
In this dissertation, we use lattice quantum chromodynamics to explore the radiative transitions of πK to K, to calculate the radiative width of the resonant K*(892) which appears in the P-wave πK → γK transition amplitude. The matrix elements are extracted from three-point functions calculated in a finite-volume discretized lattice with a pion mass of 284 MeV. The finite-volume amplitudes, which are constrained over a large number of πK energy points and four-momentum transfers, are mapped to the infinite volume transition amplitude by using the Lellouch-Lüscher formalism. The radiative width is determined to be 35(8) keV by analytically continuing the amplitude into the complex energy plane and calculating the residue at the K* pole.
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Date
2022-01-01
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Physics
DOI
https://doi.org/10.21220/xj1s-pw61