@Article{Molina+Oset2020,
author="Molina, R.
and Oset, E.",
title="Triangle singularity in B- ->K- X(3872); X ->pi 0 pi+ pi- and the X(3872) mass",
journal="European Physical Journal C",
year="2020",
publisher="Springer",
volume="80",
number="5",
pages="451--9pp",
abstract="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={\textquoteleft}{\textquoteleft}true{\textquoteright}{\textquoteright}>D<mml:mo stretchy={\textquoteleft}{\textquoteleft}false{\textquoteright}{\textquoteright}><overbar></mml:mover>0 state is bound or not, measurements like the one suggested here should be most welcome to clarify this issue.",
optnote="WOS:000546996400004",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4461), last updated on Fri, 24 Jul 2020 09:43:16 +0000",
issn="1434-6044",
doi="10.1140/epjc/s10052-020-8014-7",
opturl="https://arxiv.org/abs/2002.12821",
opturl="https://doi.org/10.1140/epjc/s10052-020-8014-7",
language="English"
}