On mass and matter

Roberts, Craig D.

doi:10.1007/s43673-021-00005-4

Cited by 48 publications

(35 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pseudoscalar mesons are fascinating for many reasons. In the light-quark sector, the pion is remarkably light owing to dynamical chiral symmetry breaking [1]; itself, a corollary of emergent hadron mass (EHM) [2,3]. Compared with the pion's light u, d quarks, the s quark in the K couples more strongly to the Higgs boson.…”

Section: Introductionmentioning

confidence: 99%

Heavy + light pseudoscalar meson semileptonic transitions

Cui

Roberts

et al. 2021

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

A symmetry-preserving regularisation of a vector $$\times $$ × vector contact interaction (SCI) is used to deliver a unified treatment of semileptonic transitions involving $$\pi $$ π , K, $$D_{(s)}$$ D ( s ) , $$B_{(s,c)}$$ B ( s , c ) initial states. The framework is characterised by algebraic simplicity, few parameters, and the ability to simultaneously treat systems from Nambu–Goldstone modes to heavy+heavy mesons. Although the SCI form factors are typically somewhat stiff, the results are comparable with experiment and rigorous theory results. Hence, predictions for the five unmeasured $$B_{s,c}$$ B s , c branching fractions should be a reasonable guide. The analysis provides insights into the effects of Higgs boson couplings via current-quark masses on the transition form factors; and results on $$B_{(s)}\rightarrow D_{(s)}$$ B ( s ) → D ( s ) transitions yield a prediction for the Isgur–Wise function in fair agreement with contemporary data.

show abstract

Section: Introductionmentioning

confidence: 99%

Heavy + light pseudoscalar meson semileptonic transitions

Cui

Roberts

et al. 2021

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Such disparities between proton and pion structure likely have their origin in dissimilarities between the expressions of emergent hadron mass in the proton and pion. Explaining them may deliver insights that can lead to an understanding of the origin of the proton mass and the character of Nambu-Goldstone bosons [15,90]. A detailed analysis of pointwise differences between proton and pion DFs is underway.…”

mentioning

confidence: 99%

Parton distributions of light quarks and antiquarks in the proton

Chang,

Gao,

Roberts

2022

Preprint

Self Cite

View full text Add to dashboard Cite

An algebraic Ansatz for the proton's Poincaré-covariant wave function, which includes both scalar and pseudovector diquark correlations, is used to calculate proton valence, sea, and glue distribution functions (DFs). Regarding contemporary data, a material pseudovector diquark component in the proton is necessary for an explanation of the neutron-proton structure function ratio; and a modest Pauli blocking effect in the gluon splitting function is sufficient to explain the proton's light-quark antimatter asymmetry. In comparison with pion DFs, the valence degrees-of-freedom in both proton and pion carry the same fraction of the host hadron's light-front momentum, but at a resolving scale typical of contemporary experiments, sea-quarks in the proton carry roughly 30% more momentum than their analogues in the pion and the proton glue fraction is 7% smaller. Understanding these differences may provide insights that explain distinctions between Nambu-Goldstone bosons and seemingly less complex hadrons.

show abstract

“…An explanation for the infrared scale of F 2 -proton may be found in EHM [62][63][64]: realised most fundamentally in QCD via the dynamical generation of running masses for gluons -QCD's gauge bosons -and quarks [68][69][70]; and expressed in manifold corollaries [70][71][72]. For example, the running masses that owe to EHM are large at infrared momenta, with that of the quark being ∼ m p /3, and the same phenomenon also endows dressed light quarks with anomalous magnetic moments that are ∼ κ p /3 in the infrared.…”

Section: Validation Of Spm Extrapolation On A1 Data -mentioning

confidence: 99%

“…Namely, the empirical fact that the gluon and quark quanta associated with the fields used to define quantum chromodynamics (QCD), the strong interaction part of the Standard Model, have never been observed in a detector. Confinement has been linked with the phenomenon of emergent hadron mass (EHM) [62][63][64], viz. the appearance of nuclear-size masses for strong interaction systems comprised of massless field quanta.…”

Section: Validation Of Spm Extrapolation On A1 Data -mentioning

confidence: 99%

Pauli radius of the proton

Cui,

Binosi,

Roberts

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Using a procedure based on interpolation via continued fractions supplemented by statistical sampling, we analyse proton magnetic form factor data obtained via electron+proton scattering on Q 2 ∈ [0.027, 0.55] GeV 2 with the goal of determining the proton magnetic radius. The approach avoids assumptions about the function form used for data interpolation and ensuing extrapolation onto Q 2 0 for extraction of the form factor slope. In this way, we find rM = 0.817( 27) fm. Regarding the difference between proton electric and magnetic radii calculated in this way, extant data are seen to be compatible with the possibility that the slopes of the proton Dirac and Pauli form factors, F1,2(Q 2 ), are not truly independent observables; to wit, the difference F 1 (0) − F 2 (0)/κp = [1 + κp]/[4m 2 p ], viz. the proton Foldy term.

show abstract

On mass and matter

Cited by 48 publications

References 94 publications

Heavy + light pseudoscalar meson semileptonic transitions

Heavy + light pseudoscalar meson semileptonic transitions

Parton distributions of light quarks and antiquarks in the proton

Pauli radius of the proton

Contact Info

Product

Resources

About