TY  - JOUR
AU  - Albaladejo, M.
AU  - Nieves, J.
AU  - Oset, E.
AU  - Sun, Z. F.
AU  - Liu, X.
PY  - 2016
DA  - 2016//
TI  - Can X(5568) be described as a B-s pi, B(K)over-bar resonant state?
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 515
EP  - 519
VL  - 757
PB  - Elsevier Science Bv
AB  - The DO Collaboration has recently seen a resonant-like peak in the B-s pi invariant mass spectrum, claimed to be a new state called X(5568). Using a B-s pi-B (K) over bar coupled channel analysis, implementing unitarity, and with the interaction derived from Heavy Meson Chiral Perturbation Theory, we are able to reproduce the reported spectrum, with a pole that can be associated to the claimed X(5568) state, and with mass and width in agreement with the ones reported in the experimental analysis. However, if the T-matrix regularization is performed by means of a momentum cutoff, the value for the latter needed to reproduce the spectrum is Lambda = 2.80 +/- 0.04 GeV, which is much larger than a "natural" value Lambda similar or equal to 1 GeV. In view of this, it is difficult to interpret the nature of this new state. This state would not qualify as a resonance dynamically generated by the unitarity loops. Assuming the observed peak to correspond to a physical state, we make predictions for partners in the D, D*, and B* sectors. Their observation (or lack thereof) would shed light into this issue.
SN  - 0370-2693
UR  - http://arxiv.org/abs/1603.09230
UR  - https://doi.org/10.1016/j.physletb.2016.04.033
DO  - 10.1016/j.physletb.2016.04.033
LA  - English
N1  - WOS:000376800300072
ID  - Albaladejo_etal2016
ER  -