The static-light baryon spectrum from twisted mass lattice QCD

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, as well as partially quenched s quarks, which have a mass around the physical value. We consider all possible combinations of two light valence quarks, i.e. Lambda, Sigma, Xi and Omega 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.

28 pages, 6 figures

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Cited by in corpus (12)

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• Lattice QCD signal for a bottom-bottom tetraquark
• Lattice investigation of the scalar mesons a_0(980) and κ using four-quark operators
• Polyakov loop in 2+1 flavor QCD
• Lambda_msbar from the static potential for QCD with n_f=2 dynamical quark flavors
• Masses of $D$ mesons, $D_s$ mesons and charmonium states from twisted mass lattice QCD
• Renormalization of the Polyakov loop with gradient flow
• Lattice QCD study of four-quark components of the isosinglet scalar mesons: Significance of disconnected diagrams
• Investigation of light and heavy tetraquark candidates using lattice QCD
• Extracting hadron masses from fixed topology simulations
• Investigating efficient methods for computing four-quark correlation functions
• Chiral symmetry restoration in static-light mesons: chiral restoration theorem, the quark running mass m(k) and first chiral restoration signals in the lattice QCD spectra