QCD Sum Rule Study for a Possible Charmed Pentaquark \Theta c(3250)
R.M. Albuquerque, S.H. Lee, M. Nielsen
TL;DR
This paper employs QCD sum rules to investigate the potential existence of a charmed pentaquark (3250), estimating its mass and comparing it with experimental observations and previous theoretical models.
Contribution
It provides a QCD sum rule analysis considering condensates up to dimension-10 for the (3250) pentaquark, offering a mass estimate consistent with experimental data.
Findings
Estimated mass of (3250) is 3.21 1.3 GeV.
The state aligns with structures observed by BaBar.
Results support the pentaquark's compatibility with previous models.
Abstract
We use QCD sum rules to study the possible existence of a \Theta c(3250) charmed pentaquark. We consider the contributions of condensates up to dimension-10 and work at leading order in \alpha_s. We obtain m(\Theta c) = (3.21 +/- 0.13) GeV, compatible with the mass of the structure seen by BaBar Collaboration in the decay channel B- -> p- \Sigma c++ pi- pi-. The proposed state is compatible with a previous proposed pentaquark state in the anti-charmed sector.
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