We continue the study of the boundedness of the operator
![](//static-cambridge-org.ezproxyberklee.flo.org/binary/version/id/urn:cambridge.org:id:binary:75822:20160718031213938-0194:S0308210515000098_inline1.gif?pub-status=live)
on the set of decreasing functions in Lp(w). This operator was first introduced by Braverman and Lai and also studied by Andersen, and although the weighted weak-type estimate
was completely solved, the characterization of the weights w such that
is bounded is still open for the case in which p > 1. The solution of this problem will have applications in the study of the boundedness on weighted Lorentz spaces of important operators in harmonic analysis.