Strangeness in the baryon ground states

Semke, A.; Lutz, Matthias

doi:10.1016/j.physletb.2012.09.008

Cited by 47 publications

(130 citation statements)

References 33 publications

Supporting

Mentioning

116

Contrasting

Order By: Relevance

“…There are several groups who have used the Feynman-Hellmann theorem [21,27,[31][32][33][34][35][36] as well as more determinations with a direct calculation of the matrix element [22][23][24][25][26][27][28] and results from a hybrid approach [29,30]. Before making a detailed comparison with other works, we first highlight advantages and disadvantages of the present work.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Scalar strange content of the nucleon from lattice QCD

2013

View full text Add to dashboard Cite

The scalar strange-quark matrix element of the nucleon is computed with lattice QCD. A mixedaction scheme is used with domain-wall valence fermions computed on the staggered MILC seaquark configurations. The matrix element is determined by making use of the Feynman-Hellmann theorem which relates this strange matrix element to the change in the nucleon mass with respect to the strange-quark mass. The final result of this calculation is m s N |ss|N = 49 ± 10 ± 15 MeV and, correspondingly f s = m s N |ss|N /m N = 0.053 ± 0.011 ± 0.016.Given the lack of a quantitative comparison of this phenomenologically important quantity determined from various lattice QCD calculations, we take the opportunity to present such an average. The resulting conservative determination is f s = 0.043 ± 0.011.Typeset by REVT E X 1

show abstract

Section: Resultsmentioning

confidence: 99%

“…These include a direct calculation of the matrix element employed by some groups [22][23][24][25][26][27][28], an indirect determination through the FeynmanHellmann theorem [21,[31][32][33][34][35][36], Eq. (2) 2 , and a hybrid approach [29,30].…”

Section: The Strange Scalar Matrix Element In the Nucleonmentioning

confidence: 99%

Scalar strange content of the nucleon from lattice QCD

2013

View full text Add to dashboard Cite

show abstract

“…The extrapolation to the physical point allows to determine σ πN together with other sigma terms and strangeness content of baryons. The difficulties encountered in HBχPT [58,65] to accomplish this program were overcome applying cut-off regularization schemes [66,67], using covariant formalisms up to O(p 3 ) [68][69][70] and O(p 4 ) [71][72][73][74][75], or complementing HBχPT with an expansion in the inverse number of colors (large-N C ) [74,76,77]. Although SU (3)-flavor calculations have reached a considerable degree of maturity, the large number of unknown LECs at O(p 4 ) and the size of the current lQCD data set limits, at present, on the accuracy attainable in the sigma terms.…”

mentioning

confidence: 99%

Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD data

et al. 2013

View full text Add to dashboard Cite

The pion-mass dependence of the nucleon mass within the covariant SU (2) baryon chiral perturbation theory both without and with explicit ∆ (1232) degrees of freedom up to order p 4 is investigated. By fitting to a comprehensive set of lattice QCD data in 2 and 2+1 flavors from several collaborations, for pion masses Mπ < 420 MeV, we obtain low energy constants of natural size and compatible with pion nucleon scattering data. Our results are consistent with the rather linear pion-mass dependence showed by lattice QCD. In the 2 flavor case we have also performed simultaneous fits to nucleon mass and σπN data. As a result of our analysis, which encompasses the study of finite volume corrections and discretization effects, we report a value of σπN = 41(5)(4) MeV in the 2 flavor case and σπN = 52(3)(8) MeV for 2+1 flavors, where the inclusion of the ∆ (1232) resonance changes the results by around 9 MeV. In the 2 flavor case we are able to set independently the scale for lQCD data, given by a Sommer scale of r0 = 0.493(23) fm.

show abstract

“…We list the values extracted for the octet and decuplet baryons in Table IX. A number of other recent works [13,48,52,[59][60][61][62][63] have computed the light σ-terms for the octet and decuplet baryons by analyzing lattice QCD data from various collaborations. We compare our results with the results of these calculations in Figs.…”

Section: Chiral and Continuum Extrapolationmentioning

confidence: 99%

Baryon spectrum with Nf=2+1+1 twisted mass fermions

Alexandrou

Drach

Hadjiyiannakou

et al. 2015

Proceedings of the 32nd International Symposium on Lattice Field Theory — PoS(LATTICE2014)

View full text Add to dashboard Cite

The masses of the low lying baryons are evaluated using a total of ten ensembles of dynamical twisted mass fermion gauge configurations. The simulations are performed using two degenerate flavors of light quarks, and a strange and a charm quark fixed to approximately their physical values. The light sea quarks correspond to pseudo scalar masses in the range of about 210 MeV to 430 MeV. We use the Iwasaki improved gluonic action at three values of the coupling constant corresponding to lattice spacing a = 0.094 fm, 0.082 fm and 0.065 fm determined from the nucleon mass. We check for both finite volume and cut-off effects on the baryon masses. We examine the issue of isospin symmetry breaking for the octet and decuplet baryons and its dependence on the lattice spacing. We show that in the continuum limit isospin breaking is consistent with zero, as expected. We performed a chiral extrapolation of the forty baryon masses using SU(2) χPT. After taking the continuum limit and extrapolating to the physical pion mass our results are in good agreement with experiment. We provide predictions for the mass of the doubly charmed Ξ * cc , as well as of the doubly and triply charmed Ωs that have not yet been determined experimentally.

show abstract

Strangeness in the baryon ground states

Cited by 47 publications

References 33 publications

Scalar strange content of the nucleon from lattice QCD

Scalar strange content of the nucleon from lattice QCD

Nucleon mass and pion-nucleon sigma term from a chiral analysis of lattice QCD data

Baryon spectrum with Nf=2+1+1 twisted mass fermions

Contact Info

Product

Resources

About