Journal
PHYSICAL REVIEW D
Volume 87, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.034032
Keywords
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Funding
- DGI fund
- FEDER fund [FIS2011-28853-C02-02, FIS2011-24149, FPA2010-16963]
- Spanish Consolider-Ingenio Program CPAN [CSD2007-00042]
- Junta de Andalucia [FQM-225]
- Generalitat Valenciana [PROMETEO/2009/0090]
- EU HadronPhysics2 project [227431]
- Rosalind Franklin Fellowship
- Ramon y Cajal Research Program
- FP7-PEOPLE-CIG [PCIG09-GA-2011-291679]
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The LHCb Collaboration has recently observed two narrow baryon resonances with beauty. Their masses and decay modes look consistent with the quark model orbitally excited states Lambda(b)(5912) and Lambda(b)*(5920), with quantum numbers J(P) = 1/2(-) and 3/2(-), respectively. We predict the existence of these states within a unitarized meson-baryon coupled-channel dynamical model, which implements heavy-quark spin symmetry. Masses, quantum numbers and couplings of these resonances to the different meson-baryon channels are obtained. We find that the resonances Lambda(0)(b)(5912) and Lambda(0)(b)(5920) are heavy-quark spin symmetry partners, which naturally explains their approximate mass degeneracy. Corresponding bottom-strange baryon resonances are predicted at Xi(b)(6035.4) (J(P) = 1/2(-)) and Xi(b)(6043.3) (J(P) = 3/2(-)). The two Lambda(b) and two Xi(b) resonances complete a multiplet of the combined symmetry SU(3)-flavor times heavy-quark spin. DOI: 10.1103/PhysRevD.87.034032
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