Nonlinear Wave-particle Interaction and Particle Trapping in Large Amplitude Dust Acoustic Waves

Chang, M.; Teng, Lee-Wen; Lin, I‐Nan; Nosenko, Vladimir Yu.; Shukła, P. K.; Thoma, Markus H.; Thomas, Hubertus M.

doi:10.1063/1.3659749

AIP Conference Proceedings

2011

DOI: 10.1063/1.3659749

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Nonlinear Wave-particle Interaction and Particle Trapping in Large Amplitude Dust Acoustic Waves

M. Chang¹,

Lee-Wen Teng²,

I‐Nan Lin³

et al.

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Cited by 6 publications

(4 citation statements)

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“…For ¼ 1, one recovers the result in Ref. [29], which exhibits a zero in G E ðQ 2 Þ, and, hence, in the ratio, at Q 2 % 8 GeV 2 . However, as is increased, so that the strength of DCSB is damped, the zero is pushed to larger values of Q 2 , until it disappears completely at ¼ 2:0.…”

supporting

confidence: 62%

“…[28][29][30]. We use that framework herein, with the dressed-quark mass function illustrated in the upper panel of Fig.…”

mentioning

confidence: 99%

“…Whether one exploits this feature in developing an approximation to the quark-quark scattering matrix within the Faddeev equation [28][29][30], as illustrated in Fig. 1, or chooses instead to eschew the simplification it offers, the outcome, when known, is the same [31].…”

mentioning

confidence: 99%

“…(8) expresses the momentum-dependent dressed-quark anomalous magnetic moment distribution, with & ¼ 0:4 being the modulating magnitude [44]. Notably, G E ðQ 2 Þ and G M ðQ 2 Þ are described equally well [28][29][30]. In order to highlight a connection between DCSB and the Q 2 dependence of proton form factors, one may introduce a damping factor into the dressed-quark propagator used for all calculations in Ref.…”

mentioning

confidence: 99%

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Revealing Dressed Quarks via the Proton’s Charge Distribution

2013

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The proton is arguably the most fundamental of Nature's readily detectable building blocks. It is at the heart of every nucleus and has never been observed to decay. It is nevertheless a composite object, defined by its valence-quark content: u + u + d -i.e., two up (u) quarks and one down (d) quark; and the manner by which they influence, inter alia, the distribution of charge and magnetisation within this bound-state. Much of novelty has recently been learnt about these distributions; and it now appears possible that the proton's momentum-space charge distribution possesses a zero. Experiments in the coming decade should answer critical questions posed by this and related advances; and we explain how such new information may assist in charting the origin and impact of key emergent phenomena within the strong interaction. Specifically, we show that the possible existence and location of a zero in the proton's electric form factor are a measure of nonperturbative features of the quark-quark interaction in the Standard Model, with particular sensitivity to the running of the dressed-quark mass.

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supporting

confidence: 62%

“…[28][29][30]. We use that framework herein, with the dressed-quark mass function illustrated in the upper panel of Fig.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Revealing Dressed Quarks via the Proton’s Charge Distribution

2013

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Nucleon and Roper electromagnetic elastic and transition form factors

et al. 2012

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We compute nucleon and Roper electromagnetic elastic and transition form factors using a Poincaré-covariant, symmetry-preserving treatment of a vector × vector contact-interaction. Obtained thereby, the electromagnetic interactions of baryons are typically described by hard form factors. In contrasting this behaviour with that produced by a momentum-dependent interaction, one achieves comparisons which highlight that elastic scattering and resonance electroproduction experiments probe the evolution of the strong interaction's running masses and coupling to infrared momenta. For example, the existence, and location if so, of a zero in the ratio of nucleon Sachs form factors are strongly influenced by the running of the dressed-quark mass. In our description of the nucleon and its first excited state, diquark correlations are important. These composite and fully-interacting correlations are instrumental in producing a zero in the Dirac form factor of the proton's d-quark; and in determining the ratio of d-to-u valence-quark distributions at x = 1, as we show via a simple formula that expresses dv/uv(x = 1) in terms of the nucleon's diquark content. The contact interaction produces a first excitation of the nucleon that is constituted predominantly from axial-vector diquark correlations. This impacts greatly on the γ * p → P11(1440) form factors, our results for which are qualitatively in agreement with the trend of available data. Notably, our dressed-quark core contribution to F2 * (Q 2 ) exhibits a zero at Q 2 ≈ 0.5 m 2 N . Faddeev equation treatments of a hadron's dressed-quark core usually underestimate its magnetic properties, hence we consider the effect produced by a dressed-quark anomalous electromagnetic moment. Its inclusion much improves agreement with experiment. On the domain 0 < Q 2 2 GeV 2 , meson-cloud effects are conjectured to be important in making a realistic comparison between experiment and hadron structure calculations. We find that our computed helicity amplitudes are similar to the bare amplitudes inferred via coupled-channels analyses of the electroproduction process. This supports a view that extant hadron structure calculations, which typically omit meson-cloud effects, should directly be compared with the bare-masses, -couplings, etc., determined via coupled-channels analyses.

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Final analysis of proton form factor ratio data atQ2=4.0, 4.8, and 5.6 GeV2

Puckett¹,

Brash²,

Gayou³

et al. 2012

Phys. Rev. C

164

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Precise measurements of the proton electromagnetic form factor ratio R = µpG p E /G p M using the polarization transfer method at Jefferson Lab have revolutionized the understanding of nucleon structure by revealing the strong decrease of R with momentum transfer Q 2 for Q 2 1 GeV 2 , in strong disagreement with previous extractions of R from cross section measurements. In particular, the polarization transfer results have exposed the limits of applicability of the one-photon-exchange approximation and highlighted the role of quark orbital angular momentum in the nucleon structure. The GEp-II experiment in Jefferson Lab's Hall A measured R at four Q 2 values in the range 3.5 GeV 2 ≤ Q 2 ≤ 5.6 GeV 2 . A possible discrepancy between the originally published GEp-II results and more recent measurements at higher Q 2 motivated a new analysis of the GEp-II data. This article presents the final results of the GEp-II experiment, including details of the new analysis, an expanded description of the apparatus and an overview of theoretical progress since the original publication. The key result of the final analysis is a systematic increase in the results for R, improving the consistency of the polarization transfer data in the high-Q 2 region. This increase is the result of an improved selection of elastic events which largely removes the systematic effect of the inelastic contamination, underestimated by the original analysis. * Corresponding author: puckett@jlab.org 2

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Nonlinear Wave-particle Interaction and Particle Trapping in Large Amplitude Dust Acoustic Waves

Cited by 6 publications

References 1 publication

Revealing Dressed Quarks via the Proton’s Charge Distribution

Revealing Dressed Quarks via the Proton’s Charge Distribution

Nucleon and Roper electromagnetic elastic and transition form factors

Final analysis of proton form factor ratio data atQ2=4.0, 4.8, and 5.6 GeV2

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