TY  - JOUR
AU  - Wang, E.
AU  - Liang, W. H.
AU  - Oset, E.
PY  - 2021
DA  - 2021//
TI  - Analysis of the e(+)e(-) -> J/psi D(D)over-bar reaction close to the threshold concerning claims of a chi(c0)(2P) state
T2  - Eur. Phys. J. A
JO  - European Physical Journal A
SP  - 38
EP  - 9pp
VL  - 57
IS  - 1
PB  - Springer
AB  - We analyze the D (D) over bar mass distribution from a recent Belle experiment on the e(+)e(-) -> J/.D (D) over bar reaction, and show that the mass distribution divided by phase sp(c)e does not have a clear peak above the D (D) over bar threshold that justifies the experimental claim of chi(c0)(2P) state from those data. Then we use a unitary formalismwith coupled channels D+ D-, D-0 (D) over bar (0), D-s(D) over bar (s), and eta eta, with some of the interactions taken from a theoretical model, and use the data to fix other parameters. We then show that, given the poor quality of the data, we can get different fits leading to very different D (D) over bar amplitudes, some of them supporting a D (D) over bar bound state and others not. The main conclusion is that the claim for the chi(c0)(2P) state, already included in the PDG, is premature, but refined data can provide very valuable information on the D (D) over bar scattering amplitude. As side effects, we warn about the use of a Breit-Wigner amplitude parameterization close to threshold, and show that the D-s(D) over bar (s) channel plays an important role in this reaction.
SN  - 1434-6001
UR  - https://arxiv.org/abs/1902.06461
UR  - https://doi.org/10.1140/epja/s10050-021-00351-9
DO  - 10.1140/epja/s10050-021-00351-9
LA  - English
N1  - WOS:000613544900001
ID  - Wang_etal2021
ER  -