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The static-light baryon spectrum from twisted mass lattice QCD

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Abstract

We compute the static-light baryon spectrum by means of Wilson twisted mass lattice QCD using N f  = 2 flavors of sea quarks. As light u/d valence quarks we consider quarks, which have the same mass as the sea quarks with corresponding pion masses in the range 340 MeV ≲ ∼ m PS ≲ 525 MeV,aswellaspartially quenched s quarks, which have a mass around the physical value. We consider all possible combinations of two light valence quarks, i.e. Λ, Σ, Ξ and Ω baryons corresponding to isospin I ∈ {0, 1/2, 1} and strangeness S ∈{0, − 1, − 2} as well as angular momentum of the light degrees of freedom j ∈{0, 1} and parity P ∈{+ , −}. We extrapolate in the light u/d and in the heavy b quark mass to the physical point and compare with available experimental results. Besides experimentally known positive parity states we are also able to predict a number of negative parity states, which have neither been measured in experiments nor previously been computed by lattice methods.

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Authors and Affiliations

  1. Humboldt-Universität zu Berlin, Institut für Physik, Newtonstraße 15, D-12489, Berlin, Germany

    Marc Wagner & Christian Wiese

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  1. Marc Wagner
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  2. Christian Wiese
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European Collaboration

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Correspondence to Marc Wagner.

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ArXiv ePrint:1104.4921

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European Collaboration., Wagner, M. & Wiese, C. The static-light baryon spectrum from twisted mass lattice QCD. J. High Energ. Phys. 2011, 16 (2011). https://doi.org/10.1007/JHEP07(2011)016

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