2001/04/30 by Stephen Godfrey, Jonathan L. Rosner · 2 citations
Physics and Astronomy · #Nuclear physics research studies #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.64.074011
published as Phys.Rev.D64:074011,2001; Erratum-ibid.D65:039901,2002 · 8 pages, LaTeX, 1 figure, correction of version published in Phys. Rev. D (Errata sent to journal)
openalex publication_date 2001/09/05 · arxiv created 2001/10/23 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The rates for magnetic dipole (M1) transitions \ensuremathΥ(nS)\ensuremath→\ensuremathηb(n^\ensuremath'S)+\ensuremathγ, n^\ensuremath'<~n are compared. The photon energies for allowed (n^\ensuremath'=n) M1 transitions are very small, so hindered (n^\ensuremath'<n) transitions could be more favorable for discovering the \ensuremathηb(1S,2S). The question then arises whether \ensuremathΥ(2S) or \ensuremathΥ(3S) is a better source of \ensuremathηb(1S). Whereas one nonrelativistic model favors \ensuremathηb(1S) production from \ensuremathΥ(2S), this advantage is lost when relativistic corrections are taken into account, and is not common to all sets of wave functions even in the purely nonrelativistic limit. Thus the prospects for discovering \ensuremathηb(1S) in \ensuremathΥ(3S) radiative decays could be comparable to those in \ensuremathΥ(2S) decays. We also discuss a suggestion for discovering \ensuremathηb via \ensuremathΥ(3S)\ensuremath→hb(1P1)\ensuremathπ\ensuremathπ, followed by hb\ensuremath→\ensuremathηb\ensuremathγ.