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Charm penguin diagrams are known to be the main contribution to charmless Bdecay process with strangeness variation equal to minus one, which is the caseof $B^\pm \to K^\pm K^+ K^-$ decay. The large phase space available in this andother B three-body decays allows non trivial final state interactions with allsort of rescattering processes and also access high momentum transfers in thecentral region of the Dalitz plane. In this work we investigate the charmPenguin contribution to $B^\pm \to K^\pm K^+ K^-$, described by a hadronictriangle loop in nonperturbative regions of the phase space, and by a partonicloop at the quasi perturbative region. These nonresonant amplitudes should havea particular structure in the Dalitz plane and their contributions to the finaldecay amplitude can be confirmed by a data amplitude analysis in this channel.In particular, the hadronic amplitude has a changing sign in the phase at$D\bar{D}$ threshold which can result in a change of sign for the CP asymmetry.

Charm Penguin in $B^\pm \to K^\pm K^+ K^-$: partonic and hadronic loops