Hunting for QCD strings in e+e−-annihilation

Kozhevnikova, Marina; Oganesian, A. G.; Teryaev, Oleg

doi:10.1051/epjconf/201920402005

Cited by 8 publications

(2 citation statements)

References 25 publications

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“…• Tachyonic gluon mass λ 2 ⋄ In [52,53], a systematic way to account for a such term is the introduction of a tachyonic gluon mass squared λ 2 . An estimate of this mass using e + e − → Hadrons data and some other data lead to, [36,52,54,55] :…”

Section: This Work Aleph [31]mentioning

confidence: 99%

QCD parameters and SM-high precisions from e+e−→ Hadrons

Narison

2023

Nuclear Physics A

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Section: This Work Aleph [31]mentioning

confidence: 99%

QCD parameters and SM-high precisions from e+e−→ Hadrons

Narison

2023

Nuclear Physics A

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“…where λ 2 is the tachyonic gluon mass determined from e + e − → hadrons data and the pion channel [9,55,56]:…”

Section: • Beyond the Standard Svz-expansionmentioning

confidence: 99%

Slope of the topological charge, proton spin and $0^{-+}$ pseudoscalar di-gluonia spectra

Narison

2021

Preprint

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In this paper, we attempt to discuss the topics mentioned in the title by scrutinizing and improving the 0 −+ pseudoscalar di-gluonia/glueballs sum rules within the standard SVZ-expansion at N2LO without instantons.First, we reconsider the estimate of the slope of the topological charge χ (0)(Q 2 = 2 GeV 2 ) = 23.9(3.4) MeV from low degree moments which imply 1 0 dx g P 1 (x) = 0.144(5) [data : 0.145(13)] for the first moment of the polarized proton structure function (proton spin) and G (0) A (10 GeV 2 ) ≡ ∆u+∆d+∆s = 0.337(50) [data = 0.330(39)] for the singlet form factor of the axial current. Second, we work with high degree moments and parametrize the spectral function beyond the minimal duality ansatz: "One resonance ⊕ QCD continuum" to get the 0 −+ pseudoscalar di-gluonia spectra. Then, we obtain three groups of gluonia : The familiar light η 1 [singlet gluon component of the η (958)] with [M η1 , f η1 ] = [870, 881(68)] MeV which is important for understanding the U (1) A anomaly; The two new medium gluonia with M P1a = 1328(112) MeV and [M P 1b = 1474(117) MeV or their mean [M P1 , f P1 ] = [1398(81), 576(144)] MeV which support the gluonium nature of the excellent experimental candidate η(1405) and may bring a small gluon piece to the η(1295); their corresponding 1st radial excitations : M P 1a = 1481(216) MeV and M P 1b = 1556(138) MeV with their mean: [M P 1 , f P 1 ] = [1524(116), 230(260)] MeV which may be identified (up to some eventual mixings with qq states) with the observed η(1475, 1700) states; The heavy gluonium with the mean mass: [M P2 , f P2 ] = [2778(133), 500(43)] MeV which is comparable with the lattice results. One can remark the (natural) one to one correspondence between the pseudoscalar gluonia and their chiral scalar analogue from Ref. [1P 2 which is mainly due to the importance of the QCD PT contributions in the sum rule analysis that are almost equal in these two channels. The results for the spectrum are summarized in Table 2.

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