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Insights into the Emergence of Mass from Studies of Pion and Kaon Structure
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Insights into the Emergence of Mass from Studies of Pion and Kaon Structure
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There are two mass generating mechanisms in the standard model of particle physics (SM). One is related to the Higgs boson and fairly well understood. The other is embedded in quantum chromodynamics (QCD), the SM's strong interaction piece; and although responsible for emergence of the roughly 1 GeV mass scale that characterises the proton and hence all observable matter, the source and impacts of this emergent hadronic mass (EHM) remain puzzling. As bound states seeded by a valence-quark and -antiquark, pseudoscalar mesons present a simpler problem in quantum field theory than that associated with the nucleon. Consequently, there is a large array of robust predictions for pion and kaon properties whose empirical validation will provide a clear window onto many effects of both mass generating mechanisms and the constructive interference between them. This has now become significant because new-era experimental facilities, in operation, construction, or planning, are capable of conducting such tests and thereby contributing greatly to resolving the puzzles of EHM. These aspects of experiment, phenomenology, and theory, along with contemporary successes and challenges, are sketched herein, simultaneously highlighting the potential gains that can accrue from a coherent effort aimed at finally reaching an understanding of the character and structure of Nature's Nambu-Goldstone modes.
Forward citations
Cited by 6 Pith papers
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Pion Distribution Amplitudes from Functional QCD
fRG-based functional QCD plus LaMET yields a saturated pion quasi-DA at Pz=4.5 GeV and a second moment ⟨ξ²⟩π=0.267, smaller than lattice-LaMET and consistent with other nonperturbative methods.
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Chirality Transfer to the Magnetic Sublattice in the Hybrid Perovskite (R)-/(S)-3-Fluoropyrrolidinium Copper(II) Chloride
Chiral organic cations induce chiral magnetic order in a centrosymmetric Cu-Cl inorganic sublattice, shown by a second-order magnetoelectric effect present only in the enantiopure (R/S) variants and absent in the race...
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Chirality Transfer to the Magnetic Sublattice in the Hybrid Perovskite (R)-/(S)-3-Fluoropyrrolidinium Copper(II) Chloride
Chiral organic cations induce chiral magnetic order and a second-order magnetoelectric effect in a 2D copper(II) chloride hybrid perovskite, while the racemic variant shows neither.
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Light tetraquark states with $J^{PC}=1^{--}$ from QCD sum rules
QCD sum rules yield lowest masses of 1.53-2.34 GeV for light 1^{--} tetraquarks across isoscalar, isovector and isotensor sectors plus one 1^{-+} isotensor mass of 2.19 GeV.
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Kaon Distribution Amplitudes from Euclidean Functional QCD
Kaon DA is single-peaked and asymmetric with moments ⟨ξ⟩_K = 0.020(3) and ⟨ξ²⟩_K = 0.253(12) after 1/P_z² and 1/P_z⁴ extrapolation of the quasi-DA.
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Light-front mass operator with dressed quarks
An effective dressed light-front mass operator for quarks is constructed from a lattice-inspired propagator and applied to compute pion TMDs, PDFs, and distribution amplitudes.
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