%0 Journal Article
%T Triangle singularity in B- ->K- X(3872); X ->pi 0 pi+ pi- and the X(3872) mass
%A Molina, R.
%A Oset, E.
%J European Physical Journal C
%D 2020
%V 80
%N 5
%I Springer
%@ 1434-6044
%G English
%F Molina+Oset2020
%O WOS:000546996400004
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4461), last updated on Fri, 24 Jul 2020 09:43:16 +0000
%X We evaluate the contribution to the X(3872) width from a triangle mechanism in which the X decays into D0D<overbar></mml:mover>0-cc, then the D0(D<overbar></mml:mover>0) decays into D0 pi 0 (D<overbar></mml:mover>0 pi 0) and the D0D<overbar></mml:mover>0 fuse to produce pi+pi-. This mechanism produces an asymmetric peak from a triangle singularity in the pi+pi- invariant mass with a shape very sensitive to the X mass. We evaluate the branching ratios for a reaction where this effect can be seen in the B--> K-pi 0 pi+pi- reaction and show that the determination of the peak in the invariant mass distribution of pi <mml:mo>+pi <mml:mo>- is all that is needed to determine the X mass. Given the present uncertainties in the X mass, which do not allow to know whether the D<mml:mo>0<mml:mover accent="true">D<mml:mo stretchy="false"><overbar></mml:mover>0 state is bound or not, measurements like the one suggested here should be most welcome to clarify this issue.
%R 10.1140/epjc/s10052-020-8014-7
%U https://arxiv.org/abs/2002.12821
%U https://doi.org/10.1140/epjc/s10052-020-8014-7
%P 451-9pp