We use QCD sum rules to study the possible existence of Q Q - over(u, ̄) over(d, ̄) mesons, assumed to be a state with JP = 1+. For definiteness, we work with a current with an axial heavy diquark and a scalar light anti-diquark, at leading order in αs. We consider the contributions of condensates up to dimension eight. For the b-quark, we predict MTb b = (10.2 ± 0.3) GeV, which is below the over(B, ̄) over(B, ̄)* threshold. For the c-quark, we predict MTc c = (4.0 ± 0.2) GeV, in agreement with quark model predictions.
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2007 May 31|
Bibliographical noteFunding Information:
This work has been partly supported by FAPESP and CNPq-Brazil, and by the Korea Research Foundation KRF-2006-C00011.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics