TY  - JOUR
AU  - Sakai, S.
AU  - Oset, E.
AU  - Guo, F. K.
PY  - 2020
DA  - 2020//
TI  - Triangle singularity in the B-> K- pi X-0 (3872) reaction and sensitivity to the X(3872) mass
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 054030
EP  - 10pp
VL  - 101
IS  - 5
PB  - Amer Physical Soc
AB  - We have done a study of the B--> K-pi X-0(3872) reaction by means of a triangle mechanism via the chain of reactions: B--> K-D*(0);(D) over bar*(0); D*(0)-> pi D-0(0); D-0(D) over bar*(0)-> X(3872). We show that this mechanism generates a triangle singularity in the pi X-0(3872) invariant mass for a very narrow window of the X(3872) mass, around the present measured values, and show that the peak positions and the shape of the mass distributions arc sensitive to the X(3872) mass, such that a measurement of the reaction can serve to improve on the present values of this mass. In particular, we point out that the X(3872) mass relative to the D-0(D) over bar*(0) threshold may be extracted from the asymmetry of the pi X-0 line shape.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2002.03160
UR  - https://doi.org/10.1103/PhysRevD.101.054030
DO  - 10.1103/PhysRevD.101.054030
LA  - English
N1  - WOS:000521093600001
ID  - Sakai_etal2020
ER  -