Excited Upsilon Radiative Decays

Details Excited Upsilon Radiative Decays Excited Upsilon Radiative Decays

2011-08-04

arxiv.org/abs/1108.1137v2

Phys.Rev.D84:094501,2011

Physics

High Energy Physics

High Energy Physics - Lattice

9 pages, 13 figures, published version

Scientific paper

10.1103/PhysRevD.84.094501

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 Y(2S) and Y(3S) decay are considerably larger than values inferred from measured decay widths.

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