scholarly journals The static-light baryon spectrum from twisted mass lattice QCD

2011 ◽  
Vol 2011 (7) ◽  
Author(s):  
Marc Wagner ◽  
◽  
Christian Wiese
Keyword(s):  
Lattice Qcd ◽  
Baryon Spectrum ◽  
Twisted Mass ◽  
Light Baryon

scholarly journals The Rho Resonance from $N_f=2+1+1$ Twisted Mass Lattice QCD

2016 ◽  
Author(s):  
Markus Werner ◽  
Christopher Helmes ◽  
Christian Jost ◽  
Bastian Knippschild ◽  
Liuming Liu ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Twisted Mass

scholarly journals The π+π+ scattering length from maximally twisted mass lattice QCD

2010 ◽  
Vol 684 (4-5) ◽  
pp. 268-274 ◽  
Author(s):  
Xu Feng ◽  
Karl Jansen ◽  
Dru Renner
Keyword(s):  
Lattice Qcd ◽  
Scattering Length ◽  
Twisted Mass

EXACT DYNAMICAL EIGHTFOLD WAY BARYON SPECTRUM AND CONFINEMENT IN STRONGLY COUPLED LATTICE QCD

2009 ◽  
Vol 24 (16n17) ◽  
pp. 3053-3072 ◽  
Author(s):  
PAULO A. FARIA DA VEIGA ◽  
MICHAEL O'CARROLL
Keyword(s):  
Lattice Qcd ◽  
Rotational Symmetry ◽  
Mass Difference ◽  
Dispersion Curves ◽  
Momentum Spectrum ◽  
Functional Integral ◽  
Strong Coupling Regime ◽  
Partial Restoration ◽  
Baryon Spectrum ◽  
The Masses

We obtain from the quark–gluon dynamics the eightfold way baryon spectrum exactly in an imaginary time functional integral formulation of 3+1 lattice QCD with Wilson's action in the strong coupling regime (small hopping parameter 0 < κ ≪ 1 and much smaller plaquette coupling [Formula: see text]). The model has SU(3)c local gauge and global SU(3)f flavor symmetries. A decoupling of the hyperplane method naturally unveils the form of the baryon composite fields. In the subspace of the physical Hilbert space of vectors with an odd number of quarks, the baryons are associated with isolated dispersion curves in the energy–momentum spectrum. Spectral representations are derived for the two-baryon correlations, which allow us to detect the energy–momentum spectrum and particles as complex momentum space singularities. The spin 1/2 octet and spin 3/2 decuplet baryons have asymptotic mass -3ln κ and for each baryon there is an antibaryon with identical spectral properties. An auxiliary function method is used to obtain convergent expansions for the masses after subtracting the singular part -3ln κ. The nonsingular part of the mass is analytic in κ and β, i.e. the expansions are controlled to all orders. For β = 0, all the masses have the form M = -3ln κ - 3κ3/4 + κ6r(κ), with r(κ) real analytic. Although we have no Lorentz symmetry in our lattice model, we show that there is a partial restoration of the continuous rotational symmetry at zero spatial momentum, which implies that for all members of the octet (decuplet) r(κ) is the same. So, there is no mass splitting within the octet and within the decuplet. However, there is an octet–decuplet mass difference of [Formula: see text] at β = 0; the splitting persists for β ≠ 0. We also obtain the (anti)baryon dispersion curves which admit the representation [Formula: see text], where [Formula: see text] and [Formula: see text] is of [Formula: see text]. For the octet, [Formula: see text] is jointly analytic in κ and in each pj, for small [Formula: see text]. A new local symmetry, which we call spin flip, is used to establish constraints for the matrix-valued two-baryon correlation and show that all the octet dispersion curves are the same and that the four decuplet dispersion curves are pairwise-identical and depend only on the modulus of the spin z-component. Using a correlation subtraction method we show that the spectrum generated by the baryon and antibaryon fields is the only spectrum, in the odd quark subspace of physical states, up to near the baryon–meson threshold of ≈ -5ln κ. Combining this result with a similar result for the mesons, with mass ≈ -2ln κ, shows that the only spectrum in the entire space of states, up to near the two-meson threshold of ≈ -4ln κ, is generated by the eightfold way hadrons. Hence, for 0 < κ ≪ β ≪ 1, we have shown confinement up to near this threshold.

scholarly journals Chiral anomaly in lattice QCD with twisted mass Wilson fermion

2009 ◽  
Vol 682 (1) ◽  
pp. 150-154 ◽  
Author(s):  
Asit K. De ◽  
A. Harindranath ◽  
Santanu Mondal
Keyword(s):  
Lattice Qcd ◽  
Chiral Anomaly ◽  
Wilson Fermion ◽  
Twisted Mass
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