B{sub s0} meson and the B{sub s0}BK coupling from QCD sum rules

Journal Article · Sun Aug 01 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.034012· OSTI ID:21432852

Bracco, M E; Nielsen, M ^[1]

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1. Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, Rod. Presidente Dutra Km 298, Polo Industrial, CEP 27537-000, Resende, RJ (Brazil)

We evaluate the mass of the B{sub s0} scalar meson and the coupling constant in the B{sub s0}BK vertex in the framework of QCD sum rules. We consider the B{sub s0} as a tetraquark state to evaluate its mass. We get m{sub B{sub s0}}=(5.85{+-}0.13) GeV, which is in agreement, considering the uncertainties, with predictions supposing it as a bs state or a BK bound state with J{sup P}=0{sup +}. To evaluate the g{sub B{sub s0}BK} coupling, we use the three-point correlation functions of the vertex, considering B{sub s0} as a normal bs state. The obtained coupling constant is: g{sub B{sub s0}BK}=(16.3{+-}3.2) GeV. This number is in agreement with light-cone QCD sum rules calculation. We have also compared the decay width of the B{sub s0}{yields}BK process considering the B{sub s0} to be a bs state and a BK molecular state. The width obtained for the BK molecular state is twice as big as the width obtained for the bs state. Therefore, we conclude that with the knowledge of the mass and the decay width of the B{sub s0} meson, one can discriminate between the different theoretical proposals for its structure.

• OSTI ID: 21432852
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevD.82.034012; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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BOUND STATE
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CORRELATION FUNCTIONS
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FORECASTING
GEV RANGE
LIGHT CONE
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PARTICLE DECAY
QUANTUM CHROMODYNAMICS
SCALAR MESONS
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