The strangeness content of the nucleon from effective field theory and phenomenology

Alarcón, José Manuel; Geng, Li-Sheng; Camalich, J. Martin; Oller, J. A.

doi:10.1016/j.physletb.2014.01.065

Cited by 202 publications

(203 citation statements)

References 44 publications

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“…[15,80,81], and of the strangeness content, see refs. [83][84][85][86] for instance. A high-precision determination of the σ πN was done from RS-equation analysis based on the improved Cheng-Dashen low-energy theorem and σ πN = (59.1 ± 3.5) MeV was reported in ref.…”

Section: Baryon Sigma Terms and The Strangeness Content Of The Nucleonmentioning

confidence: 99%

“…(6.5) with Q = M π /Λ χ , are taken into account, these fit results overlap. The previous determinations are as follows: y = 0.15(10) and σ 0 = 33(5) of the NLO calculation [83], y = 0.21 (20) and σ 0 = 36(7) of the NNLO calculation within HBChPT [84], y = 0.02(23) and σ 0 = 58(8) of the NNLO calculation within Covariant BChPT [85]. We therefore conclude that to this order in the chiral expansion, one is not able to make a precise statement about the strangeness content of the nucleon.…”

Section: Jhep05(2016)038mentioning

confidence: 99%

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

Yao

Siemens

Bernard

et al. 2016

J. High Energ. Phys.

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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.

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Section: Baryon Sigma Terms and The Strangeness Content Of The Nucleonmentioning

confidence: 99%

Section: Jhep05(2016)038mentioning

confidence: 99%

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

Yao

Siemens

Bernard

et al. 2016

J. High Energ. Phys.

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“…We also show the constraint provided by the estimates σ I 0 [13] and σ II 0 [14]. As can be seen the value of y N can constrain the value of σ s to be smaller than about 250 MeV.…”

Section: Discussionmentioning

confidence: 73%

“…in [13] and reads σ I 0 ¼ 36 AE 7 MeV. A more recent calculation using an improved method based on Lorentz covariant chiral perturbation theory with explicit decuplet-baryon resonance fields suggests σ II 0 ¼ 58 AE 8 MeV [14]. Using the aforementioned values for σ πN and σ I 0 we obtain the following phenomenological estimates of the y N parameter:…”

Section: Introductionmentioning

confidence: 77%

Strangeness of the nucleon from lattice QCD

et al. 2015

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We present a nonperturbative calculation of the strangeness of the nucleon y N within the framework of lattice QCD. This observable is known to be an important cornerstone to interpret results from direct dark matter detection experiments. We perform a lattice computation for y N with an analysis of systematic effects originating from discretization, finite size, chiral extrapolation and excited state effects leading to the value of y N ¼ 0.173ð50Þ. The rather large uncertainty of this value of y N is dominated by systematic uncertainties which we are able to quantify in this work.

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“…For this end, we focus on the effective spin independent (SI) DM-nucleon scattering cross section σ SI eff , which is defined by σ SI eff = × σ SĨ χ 0 1 p with being the fraction of theχ 0 1 in total DM and σ SĨ χ 0 1 p being the SIχ 0 1 − p scattering rate, and calculate it by the package micrOMEGAs [66] with its default setting σ πN = 34 MeV and σ 0 = 42 MeV. 4 In figure 4, we display σ SI eff versus mχ0 1 for the samples surviving the constraints considered in section 3 and section 4 together with 4 We note that if we take σπN = 59 MeV from [81] and σ0 = 58 MeV from [82], the SI cross section will be enhanced by a factor from 20% to 40%. the detection capabilities of future underground DM direct searches LZ-7.2T and XENON-1T [83].…”

Section: Future Dm Direct Searchesmentioning

confidence: 99%

Testing the light dark matter scenario of the MSSM at the LHC

Cao

Shang

et al. 2016

J. High Energ. Phys.

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In the light dark matter (DM) scenario of the MSSM, the DM relic density puts non-trivial requirements on the spectrum of supersymmetric particles. As a result, the direct search for multi-lepton signals at the LHC has great impact on the scenario. In this work, we concentrate on the searches for sleptons and electroweak-inos at the LHC, investigate their constraints on the light DM scenario with the 8 TeV LHC data, and also study their capability to test the scenario at the 14 TeV LHC. For this purpose, we first get the samples of the scenario by scanning the vast parameter space of the MSSM with various available constraints considered. Then for the surviving samples, we simulate the 2l +E miss T signal from slepton pair production process and the 2l + E miss T and 3l + E miss T signals from chargino and neutralino associated production processes at both the 8 TeV LHC and the 14 TeV LHC. Our simulations indicate that the 8 TeV LHC data have excluded a sizable portion of the samples, and the capability of the 14 TeV LHC will be much more powerful in testing the scenario. For example, in case that no excess of the multi-lepton signals is observed at the 14 TeV LHC, most samples of the light DM scenario will be excluded, especially a lower limit on the lightest neutralino mass will be set at 42 GeV and 44 GeV with 30 fb −1 and 100 fb −1 data respectively, and this limit can be further pushed up to 55 GeV with 300 fb −1 data.

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The strangeness content of the nucleon from effective field theory and phenomenology

Cited by 202 publications

References 44 publications

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

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

Strangeness of the nucleon from lattice QCD

Testing the light dark matter scenario of the MSSM at the LHC

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