%0 Journal Article
%T Can X(5568) be described as a B-s pi, B(K)over-bar resonant state?
%A Albaladejo, M.
%A Nieves, J.
%A Oset, E.
%A Sun, Z. F.
%A Liu, X.
%J Physics Letters B
%D 2016
%V 757
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F Albaladejo_etal2016
%O WOS:000376800300072
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2698), last updated on Mon, 06 Nov 2017 15:53:38 +0000
%X 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.
%R 10.1016/j.physletb.2016.04.033
%U http://arxiv.org/abs/1603.09230
%U https://doi.org/10.1016/j.physletb.2016.04.033
%P 515-519