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 mesons with connection to anomalous glue

Bass, Steven D.; Moskal, P.

doi:10.1103/revmodphys.91.015003

Cited by 63 publications

(26 citation statements)

References 324 publications

(387 reference statements)

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“…It has also been emphasized by the analysis of ref. [16], who have however left open the question whether this involves a coupling to physical pseudoscalar glueball excitations (see also [17][18][19]). Possible pseudoscalar glueballmeson mixing scenarios have been discussed widely in the literature [20][21][22][23][24][25], but exclusively in the form of mass mixings.…”

Section: Introductionmentioning

confidence: 99%

Witten-Veneziano mechanism and pseudoscalar glueball-meson mixing in holographic QCD

Leutgeb

Rebhan

2020

Phys. Rev. D

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We revisit the U(1) A anomaly in the holographic model of low-energy QCD by Witten, Sakai, and Sugimoto, presenting a new and direct derivation of the Witten-Veneziano mechanism for generating the mass of the η through an anomalous mixing of the Ramond-Ramond C 1 field with the singlet component of the pseudoscalar mesons. The latter turns out to have a kinetic mixing with the normalizable modes of the C 1 field representing pseudoscalar glueballs, yielding additional vertices for their production and their decay that dominate over those of the unmixed case considered previously in the Witten-Sakai-Sugimoto model. The leading channel is predicted to be decay into two vector mesons, followed in importance by decay into three pseudoscalar mesons. The issue of production of pseudoscalar glueballs in radiative J/ψ decays and in double diffractive processes is also discussed briefly.

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Section: Introductionmentioning

confidence: 99%

Witten-Veneziano mechanism and pseudoscalar glueball-meson mixing in holographic QCD

Leutgeb

Rebhan

2020

Phys. Rev. D

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“…In particular, the preference for a MIN+IP/IP is clear. This points to a large affinity of η to gluons as discussed in the literature [44].…”

Section: η π Mcr Fitsmentioning

confidence: 56%

“…Taking into account the uncertainties in the partial waves makes the asymmetry less acute, but it is still sizeable and negative for both channels. The asymmetry is larger for the η π reaction, making this channel appropriate to search for hybrid candidates [7,8,44].…”

Section: Forward and Backward Intensities And Asymmetrymentioning

confidence: 99%

$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$ in the double-Regge region

et al. 2021

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The production of $$\eta ^{(\prime )}\pi $$ η ( ′ ) π pairs constitutes one of the golden channels to search for hybrid exotics, with explicit gluonic degrees of freedom. Understanding the dynamics and backgrounds associated to $$\eta ^{(\prime )}\pi $$ η ( ′ ) π production above the resonance region is required to impose additional constraints to the resonance extraction. We consider the reaction $$\pi ^-p\rightarrow \eta ^{(\prime )} \pi ^- \,p$$ π - p → η ( ′ ) π - p measured by COMPASS. We show that the data in $$2.4< m_{\eta ^{(\prime )}\pi } < 3.0{\mathrm {\,GeV}} $$ 2.4 < m η ( ′ ) π < 3.0 GeV can be described by amplitudes based on double-Regge exchanges. The angular distribution of the meson pairs, in particular in the $$\eta ' \pi $$ η ′ π channel, can be attributed to flavor singlet exchanges, suggesting the presence of a large gluon content that couples strongly to the produced mesons.

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“…• In the isosinglet channel the η and η mesons are too heavy by about 300-400 MeV to be pure Goldstone bosons. They receive extra mass from non-perturbative gluon processes in the flavoursinglet channel [71] connected to non-perturbative gluon topology and the QCD axial anomaly in the divergence of the flavour-singlet axial-vector current [76,77]. While the non-singlet axialvector currents like J…”

Section: Qcd and Non-abelian Gauge Theoriesmentioning

confidence: 99%

Emergent gauge symmetries and particle physics

Bass

2020

Progress in Particle and Nuclear Physics

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Hadron properties and interactions are emergent from QCD. Atomic and condensed matter physics are emergent from QED. Could the local gauge symmetries of particle physics also be emergent? We give an introduction to this question and recent ideas connecting it to the (meta)stability of the Standard Model Higgs vacuum. With an emergent Standard Model the gauge symmetries would "dissolve" in the ultraviolet. This scenario differs from unification models which exhibit maximum symmetry in the extreme ultraviolet. With emergence, new global symmetry violations would appear in higher dimensional operators.

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η′ and η mesons with connection to anomalous glue

Cited by 63 publications

References 324 publications

Witten-Veneziano mechanism and pseudoscalar glueball-meson mixing in holographic QCD

Witten-Veneziano mechanism and pseudoscalar glueball-meson mixing in holographic QCD

$$\pi ^-p\rightarrow \eta ^{(\prime )}\, \pi ^- p$$ in the double-Regge region

Emergent gauge symmetries and particle physics

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