2023-11-29T19:41:33Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/72582023-07-19T06:14:40Zcom_20.500.14352_14col_20.500.14352_15
00925njm 22002777a 4500
dc
Molina, Raquel
author
Oset, Eulogio
author
2020-05-20
We evaluate the contribution to the X(3872) width from a triangle mechanism in which the X decays into D∗0D¯0−cc, then the D∗0(D¯∗0) decays into D0π0 (D¯0π0) and the D0D¯0 fuse to produce π+π−. This mechanism produces an asymmetric peak from a triangle singularity in the π+π− 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−π0π+π− reaction and show that the determination of the peak in the invariant mass distribution of π+π− 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∗0D¯0 state is bound or not, measurements like the one suggested here should be most welcome to clarify this issue.
1434-6044
10.1140/epjc/s10052-020-8014-7
https://hdl.handle.net/20.500.14352/7258
https://doi.org/10.1140/epjc%2Fs10052-020-8014-7
Triangle singularity in B− → K−X(3872); X → π0π+π− and the X(3872) mass