QCD sum rules study of the meson Z+(4430)

We use QCD sum rules to study the recently observed meson Z+(4430), considered as a D∗D1 molecule with JP=0−. We consider the contributions of condensates up to dimension eight and work at leading order in αs. We get mZ=(4.40±0.10) GeV in a very good agreement with the experimental value. We also ma...

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Bibliographic Details
Published in:Physics letters. B 2008-03, Vol.661 (1), p.28-32
Main Authors: Lee, Su Houng, Mihara, Antonio, Navarra, Fernando S., Nielsen, Marina
Format: Article
Language:English
Subjects:
Exact sciences and technology
Nuclear physics
Physics
The physics of elementary particles and fields
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Summary:We use QCD sum rules to study the recently observed meson Z+(4430), considered as a D∗D1 molecule with JP=0−. We consider the contributions of condensates up to dimension eight and work at leading order in αs. We get mZ=(4.40±0.10) GeV in a very good agreement with the experimental value. We also make predictions for the analogous mesons Zs and Zbb considered as Ds∗D1 and B∗B1 molecules, respectively. For Zs we predict mZs=(4.70±0.06) GeV, which is above the Ds∗D1 threshold, indicating that it is probably a very broad state and, therefore, difficult to observe experimentally. For Zbb we predict mZbb=(10.74±0.12) GeV, in agreement with quark model predictions.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2008.01.062