Year: 2011
Type: article
Abstract: Bottomonium $S$-wave states were studied using lattice NRQCD. Masses of ground and excited states were calculated using multiexponential fitting to a set of correlation functions constructed using both local and wavefunction-smeared operators. Three-point functions for M1 transitions between vector and pseudoscalar states were computed. Robust signals for transitions involving the first two excited states were obtained. The qualitative features of the transition matrix elements are in agreement with expectations. The calculated values of matrix elements for $\ensuremath{\Upsilon}(2S)$ and $\ensuremath{\Upsilon}(3S)$ decay are considerably larger than values inferred from measured decay widths.
Authors: Randy Lewis, R. M. Woloshyn
Institutions: York University, TRIUMF
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1974044760