TY  - JOUR
AU  - Liang, W. H.
AU  - Sakai, S.
AU  - Xie, J. J.
AU  - Oset, E.
PY  - 2018
DA  - 2018//
TI  - Triangle singularity enhancing isospin violation in (B)over-bar(s)(0)-> J/psi pi(0)f(0)(980)
T2  - Chin. Phys. C
JO  - Chinese Physics C
SP  - 044101
EP  - 9pp
VL  - 42
IS  - 4
PB  - Iop Publishing Ltd
KW  - triangle singularity
KW  - light scalar meson
KW  - isospin violation
KW  - bottom meson decay
AB  - We perform calculations for the (B) over bar (0)(s)-> J/psi pi(0)f(0)(980) and (B) over bar (0)(s)-> J/psi pi(0)a(0)(980) reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, with (B) over bar (0)(s)-> J/psi K*(K) over bar +c.c., followed by the decay K*-> K pi and a further fusion of K (K) over bar into the f(0)(980) or a(0)(980). We show that the mechanism develops a singularity around the pi(0)f(0)(980) or pi(0)a(0)(980) invariant mass of 1420 MeV, where the pi(0)f(0) and pi(0)a(0) decay modes are magnified and also the ratio of pi(0)f(0) to pi(0)a(0) production. Using experimental information for the (B) over bar (0)(s)-> J/psi K*(K) over bar +c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.
SN  - 1674-1137
UR  - http://arxiv.org/abs/1711.04603
UR  - https://doi.org/10.1088/1674-1137/42/4/044101
DO  - 10.1088/1674-1137/42/4/044101
LA  - English
N1  - WOS:000430884300013
ID  - Liang_etal2018
ER  -