New determination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">S</mml:mi><mml:mi mathvariant="script">T</mml:mi><mml:mo stretchy="false">⟨</mml:mo><mml:mi>N</mml:mi><mml:mo stretchy="false">|</mml:mo><mml:mover accent="true"><mml:mi>q</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:msub><mml:mi>D</mml:mi><mml:mi>μ</mml:mi></mml:msub><mml:msub><mml:mi>D</mml:mi><mml:mi>ν</mml:mi></mml:msub><mml:mi>q</mml:mi><mml:mo stretchy="false">|</m

Gubler, Philipp; Jeong, Kie Sang; Lee, Su Houng

doi:10.1103/physrevd.92.014010

Cited by 18 publications

(15 citation statements)

References 27 publications

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“…[199], while the same condensates containing strange quarks were considered in Ref. [145]. Estimates of the nucleon expectation values of gluonic dimension 6 operators are provided in Ref.…”

Section: Condensates Of Dimensionmentioning

confidence: 99%

Recent progress in QCD condensate evaluations and sum rules

Gubler

Satow

2019

Progress in Particle and Nuclear Physics

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We review the recent status of the QCD sum rule approach to study the properties of hadrons in vacuum and in hot or dense matter. Special focus is laid on the progress made in the evaluation of the QCD condensates, which are the input of all QCD sum rule calculations, and for which much new information has become available through high precision lattice QCD calculations, chiral perturbation theory and experimental measurements. Furthermore, we critically examine common analysis methods for QCD sum rules and contrast them with potential alternative strategies. The status of QCD sum rule studies investigating the modification of hadrons at finite density as well as recent derivations of exact sum rules applicable to finite temperature spectral functions, are also reviewed.

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Section: Condensates Of Dimensionmentioning

confidence: 99%

Recent progress in QCD condensate evaluations and sum rules

Gubler

Satow

2019

Progress in Particle and Nuclear Physics

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“…These involve expectation values of twist-2 or twist-4 operators which can be constructed from both quark and gluon fields. The OPE for the quark-operators was recently worked out in [63], the full result for the gluonic sector is however still missing (see [64] for a discussion of such operators in the context of quarkonium sum rules). In this work, we will ignore all those non-scalar operators of dimension 6 in order to get a rough idea on the value of κ N at normal nuclear matter density.…”

Section: Strange Four-quark Condensates In Vacuum and Nuclear Mattermentioning

confidence: 99%

Phi meson spectral moments and QCD condensates in nuclear matter

Gubler

Weise

2016

Nuclear Physics A

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A detailed analysis of the lowest two moments of the φ meson spectral function in vacuum and nuclear matter is performed. The consistency is examined between the constraints derived from finite energy QCD sum rules and the spectra computed within an improved vector dominance model, incorporating the coupling of kaonic degrees of freedom with the bare φ meson. In the vacuum, recent accurate measurements of the e + e − → K + K − cross section allow us to determine the spectral function with high precision. In nuclear matter, the modification of the spectral function can be described by the interactions of the kaons from φ → KK with the surrounding nuclear medium. This leads primarily to a strong broadening and an asymmetric deformation of the φ meson peak structure. We confirm that, both in vacuum and nuclear matter, the zeroth and first moments of the corresponding spectral functions satisfy the requirements of the finite energy sum rules to a remarkable degree of accuracy. Limits on the strangeness sigma term of the nucleon are examined in this context. Applying our results to the second moment of the spectrum, we furthermore discuss constraints on four-quark condensates and the validity of the commonly used ground state saturation approximation.

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“…In the work of [7], some of these corrections are taken into account. We also note here that some of these corrections have been determined only recently thanks to new experimental data [41]. Keeping here only the above twist-2 operator, resulting in-medium corrections to the coefficient c 4 of Eq.…”

Section: Qcd Sum Rules At Finite Densitymentioning

confidence: 98%

The ϕ Meson in Nuclear Matter and the Strangeness Content of the Nucleon

Gubler¹

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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Recent progress related to the description of the ϕ meson in nuclear matter is reviewed and summarized. These proceedings in particular focus on the relation between the ϕ meson spectral function and the strangeness content of the nucleon, ⟨N|ss|N⟩. This relation is established through the socalled QCD sum rules, which provide a link between certain integrals of the spectral function and QCD condensates. We furthermore examine the modification of the ϕ meson spectral function at finite density using a simple model based on effective hadronic degrees of freedom and discuss its implication for the future E16 experiment at J-PARC.

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New determination ofST⟨N|q¯DμDνq|

Cited by 18 publications

References 27 publications

Recent progress in QCD condensate evaluations and sum rules

Recent progress in QCD condensate evaluations and sum rules

Phi meson spectral moments and QCD condensates in nuclear matter

The ϕ Meson in Nuclear Matter and the Strangeness Content of the Nucleon

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