Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12

Carman, D. S.; Joo, K. S.; Mokeev, V.

doi:10.1007/s00601-020-01563-3

Cited by 54 publications

(78 citation statements)

References 95 publications

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“…The fitted value of m s /m l = 24 is compatible with estimates in QCD [1], even though the individual current-masses are too large by a factor of 2 because of the CI's deficiencies in connection with ultraviolet quantities. The result M s /M l = 1.4 is commensurate with the value obtained in efficacious RL studies with momentumdependent interactions [24]: M s /M l = 1.25 (9).…”

Section: T)supporting

confidence: 86%

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Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

et al. 2021

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A symmetry-preserving treatment of a vector $$\times $$ × vector contact interaction is used to compute spectra of ground-state $$J^P = 0^\pm , 1^\pm $$ J P = 0 ± , 1 ± $$(f{\bar{g}})$$ ( f g ¯ ) mesons, their partner diquark correlations, and $$J^P=1/2^\pm , 3/2^\pm $$ J P = 1 / 2 ± , 3 / 2 ± (fgh) baryons, where $$f,g,h \in \{u,d,s,c,b\}$$ f , g , h ∈ { u , d , s , c , b } . Results for the leptonic decay constants of all mesons are also obtained, including scalar and pseudovector states involving heavy quarks. The spectrum of baryons produced by this chiefly algebraic approach reproduces the 64 masses known empirically or computed using lattice-regularised quantum chromodynamics with an accuracy of 1.4(1.2)%. It also has the richness of states typical of constituent-quark models and predicts many baryon states that have not yet been observed. The study indicates that dynamical, nonpointlike diquark correlations play an important role in all baryons; and, typically, the lightest allowed diquark is the most important component of a baryon’s Faddeev amplitude.

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Section: T)supporting

confidence: 86%

“…also includes systems containing {s, c, b} quarks and/or related antiquarks. The empiria e-mail: yinpl@njupt.edu.cn b e-mail: phycui@nju.edu.cn c e-mail: cdroberts@nju.edu.cn (corresponding author) d e-mail: jsegovia@upo.es cally "missing" states are being sought in a worldwide effort [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

et al. 2021

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“…Whilst hadron masses are largely insensitive to the running of the dressed-quark mass, this feature becomes vital for dynamical, structural properties, inter alia: elastic and transition form factors [64][65][66] and parton distribution functions and amplitudes [23,[43][44][45][46][67][68][69][70].…”

Section: Emergence and Evolution Of Constituent Quarksmentioning

confidence: 99%

On mass and matter

Roberts

2021

AAPPS Bull.

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The visible Universe is largely characterised by a single mass scale, namely, the proton mass, mp. Contemporary theory suggests that mp emerges as a consequence of gluon self-interactions, which are a defining characteristic of quantum chromodynamics (QCD), the theory of strong interactions in the Standard Model. However, the proton is not elementary. Its mass appears as a corollary of other, more basic emergent phenomena latent in the QCD Lagrangian, e.g. generation of nuclear-size gluon and quark mass-scales, and a unique effective charge that may describe QCD interactions at all accessible momentum scales. These remarks are explained herein, and focusing on the distribution amplitudes and functions of π and K mesons, promising paths for their empirical verification are elucidated. Connected therewith, in anticipation that production of J/ψ-mesons using π and K beams can provide access to the gluon distributions in these pseudo-Nambu-Goldstone modes, predictions for all π and K distribution functions are provided at the scale ζ=mJ/ψ.

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“…In connection with the Nambu-Goldstone pions, two key corollaries of EHM are the appearance of a mass-function for quarks, whose value on k 2 0 is roughly m p /3 [12], and the intimate relationship [13][14][15][16][17][18] between that mass function and the pion's Poincaré-covariant bound-state wave function, χ π (k, k − P), where P is the pion's total momentum and k is the momentum of the valence-quark. Combined, these two properties entail that although it can be exposed using a wide variety of means [19][20][21][22], the cleanest observable manifestations of EHM are to be found in pion properties; so imparting utmost importance to the goals of revealing and explaining pion structure [23][24][25][26][27][28]. In this connection, much can be learnt from data that may be used to extract pion parton distribution functions (DFs).…”

Section: Introductionmentioning

confidence: 99%

Concerning pion parton distributions

et al. 2022

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Analyses of the pion valence-quark distribution function (DF), "Equation missing", which explicitly incorporate the behaviour of the pion wave function prescribed by quantum chromodynamics (QCD), predict "Equation missing", $$\beta (\zeta \gtrsim m_p)>2$$ β ( ζ ≳ m p ) > 2 , where $$m_p$$ m p is the proton mass. Nevertheless, more than forty years after the first experiment to collect data suitable for extracting the $$x\simeq 1$$ x ≃ 1 behaviour of "Equation missing", the empirical status remains uncertain because some methods used to fit existing data return a result for "Equation missing" that violates this constraint. Such disagreement entails one of the following conclusions: the analysis concerned is incomplete; not all data being considered are a true expression of qualities intrinsic to the pion; or QCD, as it is currently understood, is not the theory of strong interactions. New, precise data are necessary before a final conclusion is possible. In developing these positions, we exploit a single proposition, viz. there is an effective charge which defines an evolution scheme for parton DFs that is all-orders exact. This proposition has numerous corollaries, which can be used to test the character of any DF, whether fitted or calculated.

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Strong QCD Insights from Excited Nucleon Structure Studies with CLAS and CLAS12

Cited by 54 publications

References 95 publications

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

Masses of positive- and negative-parity hadron ground-states, including those with heavy quarks

On mass and matter

Concerning pion parton distributions

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