Scalar strange content of the nucleon from lattice QCD

Junnarkar, Parikshit; Walker-Loud, André

doi:10.1103/physrevd.87.114510

Cited by 238 publications

(229 citation statements)

References 119 publications

(169 reference statements)

Supporting

Mentioning

217

Contrasting

Order By: Relevance

“…in good agreement with the scalar strange content of the nucleon from lattice QCD calculations [51]. The gluon scalar form factor is given by f (p,n)…”

Section: A Constraints From Direct Dm Searchessupporting

confidence: 74%

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

et al. 2015

View full text Add to dashboard Cite

We study the vacuum stability of a minimal Higgs portal model in which the standard model (SM) particle spectrum is extended to include one complex scalar field and one Dirac fermion. These new fields are singlets under the SM gauge group and are charged under a global U (1) symmetry. Breaking of this U (1) symmetry results in a massless Goldstone boson, a massive CPeven scalar, and splits the Dirac fermion into two new mass-eigenstates, corresponding to Majorana fermions. The lightest Majorana fermion (w) is absolutely stable, providing a plausible dark matter (DM) candidate. We show that interactions between the Higgs sector and the lightest Majorana fermion which are strong enough to yield a thermal relic abundance consistent with observation can easily destabilize the electroweak vacuum or drive the theory into a non-perturbative regime at an energy scale well below the Planck mass. However, we also demonstrate that there is a region of the parameter space which develops a stable vacuum (up to the Planck scale), satisfies the relic abundance, and is in agreement with direct DM searches. Such an interesting region of the parameter space corresponds to DM masses 350 GeV mw 1 TeV. The region of interest is within reach of second generation DM direct detection experiments.

show abstract

“…in good agreement with the scalar strange content of the nucleon from lattice QCD calculations [51]. The gluon scalar form factor is given by f (p,n)…”

Section: A Constraints From Direct Dm Searchessupporting

confidence: 74%

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Hence at the order one is working here, we unfortunately cannot disentangle a small from a large value of y. Similar picture appears when one takes an overall view on the previous determinations from BChPT [83][84][85] and Lattice QCD [87][88][89][90][91][92][93][94][95][96][97]. Within these two strategies, we predict all the octet baryon sigma terms as well.…”

Section: Jhep05(2016)038 8 Summary and Conclusionmentioning

confidence: 56%

Pion-nucleon scattering in covariant baryon chiral perturbation theory with explicit Delta resonances

Yao

Siemens

Bernard

et al. 2016

J. High Energ. Phys.

100

View full text Add to dashboard Cite

We present the results of a third order calculation of the pion-nucleon scattering amplitude in a chiral effective field theory with pions, nucleons and delta resonances as explicit degrees of freedom. We work in a manifestly Lorentz invariant formulation of baryon chiral perturbation theory using dimensional regularization and the extended on-mass-shell renormalization scheme. In the delta resonance sector, the on mass-shell renormalization is realized as a complex-mass scheme. By fitting the low-energy constants of the effective Lagrangian to the S-and P -partial waves a satisfactory description of the phase shifts from the analysis of the Roy-Steiner equations is obtained. We predict the phase shifts for the D and F waves and compare them with the results of the analysis of the George Washington University group. The threshold parameters are calculated both in the delta-less and delta-full cases. Based on the determined low-energy constants, we discuss the pion-nucleon sigma term. Additionally, in order to determine the strangeness content of the nucleon, we calculate the octet baryon masses in the presence of decuplet resonances up to next-to-next-to-leading order in SU(3) baryon chiral perturbation theory. The octet baryon sigma terms are predicted as a byproduct of this calculation.

show abstract

“…Those calculations gave relatively large values for f Ts on the order of ∼ 0.19(1) [7]. More recent calculations with Wilson-Clover dynamical fermions also yield large values (f Ts ∼ 0.1-0.46) [9][10][11], whereas calculations with fermions incorporating chiral symmetry result in much smaller f Ts on the order of a few percent [12][13][14][15][16][17][18][19].…”

mentioning

confidence: 99%

Strangeness and charmness content of the nucleon from overlap fermions on2+1-flavor domain-wall fermion configurations

et al. 2013

View full text Add to dashboard Cite

We present a calculation of the strangeness and charmness contents N |ss|N and N |cc|N of the nucleon from dynamical lattice QCD with 2 + 1 flavors. The calculation is performed with overlap valence quarks on 2+1-flavor domain-wall fermion gauge configurations. The configurations are generated by the RBC collaboration on a 24 3 × 64 lattice with sea quark mass am l = 0.005, am s = 0.04, and inverse lattice spacing a −1 = 1.73 GeV. Both actions have chiral symmetry which is essential in avoiding contamination due to the operator mixing with other flavors. Nucleon propagator and the quark loops are both computed with stochastic grid sources, while low-mode substitution and low-mode averaging methods are used respectively which substantially improve the signal to noise ratio. We obtain the strangeness matrix element f Ts = m s N |ss|N /M N = 0.0334(62), and the charmness content f Tc = m c N |cc|N /M N = 0.094(31) which is resolved from zero by 3 σ precision for the first time.

show abstract

Scalar strange content of the nucleon from lattice QCD

Cited by 238 publications

References 119 publications

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

Majorana dark matter through the Higgs portal under the vacuum stability lamppost

Pion-nucleon scattering in covariant baryon chiral perturbation theory with explicit Delta resonances

Strangeness and charmness content of the nucleon from overlap fermions on2+1-flavor domain-wall fermion configurations

Contact Info

Product

Resources

About