Meson masses and decay constants from unquenched lattice QCD

Jansen, Karl; McNeile, Craig; Michael, C.; Urbach, Carsten

doi:10.1103/physrevd.80.054510

Cited by 65 publications

(56 citation statements)

References 129 publications

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“…This approach is by now well established, with many physical results obtained with two light degenerate twisted mass flavours (N f = 2) by our European Twisted Mass (ETM) Collaboration, see refs. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For a review see ref.…”

Section: Introduction and Main Resultsmentioning

confidence: 99%

Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks

Baron

Boucaud

Carbonell

et al. 2010

J. High Energ. Phys.

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215

257

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We present results of lattice QCD simulations with mass-degenerate up and down and mass-split strange and charm (N f = 2 + 1 + 1) dynamical quarks using Wilson twisted mass fermions at maximal twist. The tuning of the strange and charm quark masses is performed at two values of the lattice spacing a ≈ 0.078 fm and a ≈ 0.086 fm with lattice sizes ranging from L ≈ 1.9 fm to L ≈ 2.8 fm. We measure with high statistical precision the light pseudoscalar mass m PS and decay constant f PS in a range 270 m PS 510 MeV and determine the low energy parameters f 0 andl 3,4 of SU(2) chiral perturbation theory. We use the two values of the lattice spacing, several lattice sizes as well as different values of the light, strange and charm quark masses to explore the systematic effects. A first study of discretisation effects in light-quark observables and a comparison to N f = 2 results are performed.

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Section: Introduction and Main Resultsmentioning

confidence: 99%

Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks

Baron

Boucaud

Carbonell

et al. 2010

J. High Energ. Phys.

Self Cite

215

257

View full text Add to dashboard Cite

show abstract

“…refs. [14][15][16][17][18][19][20][21][22][23][24][25]. A detailed study of the continuum-limit scaling in the quenched approximation [26][27][28][29] revealed not only…”

Section: Introductionmentioning

confidence: 99%

Light meson physics from maximally twisted mass lattice QCD

Baron

Boucaud

Dimopoulos

et al. 2010

J. High Energ. Phys.

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128

142

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We present a comprehensive investigation of light meson physics using maximally twisted mass fermions for N f = 2 mass-degenerate quark flavours. By employing four values of the lattice spacing, spatial lattice extents ranging from 2.0 fm to 2.5 fm and pseudo scalar masses in the range 280 m PS 650 MeV we control the major systematic effects of our calculation. This enables us to confront our N f = 2 data with SU(2) chiral perturbation theory and extract low energy constants of the effective chiral Lagrangian and derived quantities, such as the light quark mass.

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“…A lattice QCD result for the coupling of I = 1 scalars tō ud is presented in [25]. Studies of couplings to tetraquark operators have also been recently undertaken [26,27].…”

mentioning

confidence: 99%

Couplings of light I=0 scalar mesons to simple operators in the complex plane

Moussallam

2011

Eur. Phys. J. C

141

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The flavour and glue structure of the light scalar mesons in QCD are probed by studying the couplings of the I = 0 mesons σ(600) and f 0 (980) to the operatorsqq, α s G 2 and to two photons. The Roy dispersive representation for the ππ amplitude t 0 0 (s) is used to determine the pole positions as well as the residues in the complex plane. On the real axis, t 0 0 is constrained to solve the Roy equation together with elastic unitarity up to the KK threshold leading to an improved description of the f 0 (980). The problem of using a two-particle threshold as a matching point is discussed. A simple relation is established between the coupling of a scalar meson to an operator j S and the value of the related pion form-factor computed at the resonance pole. Pion scalar form-factors as well as two-photon partial-wave amplitudes are expressed as coupled-channel Omnès dispersive representations. Subtraction constants are constrained by chiral symmetry and experimental data. Comparison of our results for theqq couplings with earlier determinations of the analogous couplings of the lightest I = 1 and I = 1/2 scalar mesons are compatible with an assignment of the σ, κ, a 0 (980), f 0 (980) into a nonet. Concerning the gluonic operator α s G 2 we find a significant coupling to both the σ and the f 0 (980).

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Meson masses and decay constants from unquenched lattice QCD

Cited by 65 publications

References 129 publications

Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks

Light hadrons from lattice QCD with light (u, d), strange and charm dynamical quarks

Light meson physics from maximally twisted mass lattice QCD

Couplings of light I=0 scalar mesons to simple operators in the complex plane

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