The Hindered M1 Radiative Decay Υ(2S) → η_b(1S)γ from Lattice NRQCD
dc.creator | Hughes, Ciaran | |
dc.creator | Dowdall, Rachel J | |
dc.creator | Davies, Christine TH | |
dc.creator | Horgan, Ronald Raymond | |
dc.creator | von, Hippel Georg | |
dc.creator | Wingate, Matthew Bowen | |
dc.date.accessioned | 2018-11-24T23:18:24Z | |
dc.date.available | 2015-09-21T11:09:27Z | |
dc.date.available | 2018-11-24T23:18:24Z | |
dc.date.issued | 2015-11-03 | |
dc.identifier | https://www.repository.cam.ac.uk/handle/1810/251080 | |
dc.identifier.uri | http://repository.aust.edu.ng/xmlui/handle/123456789/3268 | |
dc.description.abstract | We present a calculation of the hindered M1 Υ(2S) → η_b(1S)γ decay rate using lattice nonrelativistic QCD. The calculation includes spin-dependent relativistic corrections to the NRQCD action through O(v⁶ ) in the quark’s relative velocity, relativistic corrections to the leading order current which mediates the transition through the quark’s magnetic moment, radiative corrections to the leading spin-magnetic coupling and for the first time a full error budget. We also use gluon field ensembles at multiple lattice spacing values, all of which include u, d, s and c quark vacuum polarisation. Our result for the branching fraction is B(Υ(2S) → η_b(1S)γ) = 5.4(1.8) × 10‾⁴ , which agrees with the current experimental value. | |
dc.language | en | |
dc.publisher | APS | |
dc.publisher | Physical Review D | |
dc.title | The Hindered M1 Radiative Decay Υ(2S) → η_b(1S)γ from Lattice NRQCD | |
dc.type | Article |
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Hughes et al. 2015 Physical Review D.pdf | 2.071Mb | application/pdf | View/ |