期刊
PHYSICS LETTERS B
卷 757, 期 -, 页码 515-519出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2016.04.033
关键词
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资金
- Juan de la Cierva program from the Spanish MINECO [27-13-463B-731]
- Spanish MINECO
- European FEDER funds [FIS2014-51948-C2-1-P, FIS2014-51948-C2-2-P, FIS2014-57026-REDT, SEV-2014-0398]
- Generalitat Valenciana [PROMETEOII/2014/0068]
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. (C) 2016 The Authors. Published by Elsevier B.V.
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