4.5 Article

Valence Quark Ratio in the Proton

Related references

Note: Only part of the references are listed.
Article Astronomy & Astrophysics

Semileptonic transitions: B(s) → π(K); Ds → K; D → π, K; and K → π

Zhao-Qian Yao et al.

Summary: Continuum Schwinger function methods are used to predict transition form factors and branching fractions in the strong-interaction bound-state problem. The results agree with available data and provide benchmarks for unmeasured form factors. The study also predicts values for V-cs vertical bar and branching fraction ratios, which can be used to test lepton flavour universality. Quantitative comparisons are made with recent experimental measurements, emphasizing the importance of further refinements.

PHYSICS LETTERS B (2022)

Review Physics, Nuclear

Diquark correlations in hadron physics: Origin, impact and evidence

M. Yu Barabanov et al.

Summary: In the past decade, there has been a significant shift in understanding the internal structure of hadrons, with new theoretical techniques and experimental findings suggesting that soft quark+quark (diquark) correlations play a crucial role in hadron physics. These correlations are believed to be a necessary consequence of dynamical chiral symmetry breaking and may be critical for the formation of exotic tetra- and penta-quark hadrons.

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS (2021)

Article Physics, Nuclear

Higgs modulation of emergent mass as revealed in kaon and pion parton distributions

Z-F Cui et al.

Summary: The study discusses the distribution functions of K mesons, compares them with similar distributions of π mesons, and reveals how their light-front momentum is shared. The research provides the first parameter-free predictions for K distribution functions, emphasizing the need for new experiments sensitive to all K and π DFs.

EUROPEAN PHYSICAL JOURNAL A (2021)

Article Physics, Multidisciplinary

Pauli Radius of the Proton

Zhu-Fang Cui et al.

Summary: By using interpolation and statistical sampling, the proton magnetic radius is determined to be 0.817(27) fm based on analyzed data obtained from electron+proton scattering. The difference between proton electric and magnetic radii suggests a possible relationship between the slopes of the proton Dirac and Pauli form factors.

CHINESE PHYSICS LETTERS (2021)

Article Physics, Multidisciplinary

Isovector EMC Effect from Global QCD Analysis with MARATHON Data

C. Cocuzza et al.

Summary: This study reports the results of a Monte Carlo global QCD analysis, utilizing constraints from the MARATHON experiment at Jefferson Lab for the first time. The analysis revealed indications of an isovector nuclear EMC effect in light nuclei in the simultaneous study of nucleon PDFs and nuclear effects in A = 2 and A = 3 nuclei. The MARATHON data provided relatively weak constraints on certain structure function ratios and PDF ratios, but raised questions about assumptions commonly made in nuclear PDF analyses by suggesting an enhanced nuclear effect on the d-quark PDF in the bound proton.

PHYSICAL REVIEW LETTERS (2021)

Article Multidisciplinary Sciences

The asymmetry of antimatter in the proton

J. Dove et al.

Summary: Quark-antiquark annihilation measurements confirm the asymmetry between down and up antiquarks within protons. The majority of a proton's mass is in the form of quark kinetic and potential energy, as well as gluon energy from the strong force. The presence of more down antiquarks than up antiquarks in protons suggests the need for further study to understand this antimatter asymmetry.

NATURE (2021)

Article Astronomy & Astrophysics

Semileptonic Bc → ηc, J/ψ transitions

Zhao-Qian Yao et al.

Summary: Using a systematic, symmetry-preserving continuum approach, parameter-free predictions were made for all semileptonic B-c -> eta(c), J/psi transition form factors. The study confirms a 2 sigma discrepancy between the Standard Model prediction for R-J/psi and the single available experimental result.

PHYSICS LETTERS B (2021)

Article Physics, Multidisciplinary

Fresh Extraction of the Proton Charge Radius from Electron Scattering

Zhu-Fang Cui et al.

Summary: A novel method for extracting the proton radius from elastic electron-proton scattering data is presented, based on interpolation via continued fractions and statistical sampling without assuming a specific function form. Analysis of modern ep datasets shows consistent results, leading to r(p) = 0.847(8) fm by combining them, which compares favorably with values obtained from contemporary measurements in different spectroscopy.

PHYSICAL REVIEW LETTERS (2021)

Article Astronomy & Astrophysics

Pion charge radius from pion plus electron elastic scattering data

Zhu-Fang Cui et al.

Summary: By analyzing existing precise pion+electron elastic scattering data and using interpolation method, the pion charge radius is determined with a value slightly different from the commonly quoted average. More precise data collection and analysis are needed to verify the results. Insufficient information is found in the available kaon+electron elastic scattering data sets to extract an objective result for the charged-kaon radius, supporting the necessity for more accurate data.

PHYSICS LETTERS B (2021)

Review Physics, Nuclear

Insights into the emergence of mass from studies of pion and kaon structure

Craig D. Roberts et al.

Summary: In the standard model of particle physics, there are two mass generating mechanisms: one related to the Higgs boson which is well understood, and the other embedded in quantum chromodynamics responsible for the emergence of hadronic mass, which remains puzzling. Recent progress has been made using theoretical tools like continuum Schwinger function methods and lattice-regularised QCD to understand these mechanisms better and shed light on Nature's Nambu-Goldstone modes. New experimental facilities are expected to contribute greatly in resolving the puzzles of emergent hadronic mass.

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS (2021)

Article Physics, Multidisciplinary

Regarding the Distribution of Glue in the Pion

Lei Chang et al.

Summary: Understanding the difference in the scale of emergent hadron mass in proton and pion may require mapping and comparing the distribution functions of all partons within each. The difficulty in predicting the proton's distribution functions lies in it being a three-body bound-state problem, while the pion's two-body problem allows for more accurate predictions. The alignment of theory in this area is promising, especially with experimental facilities now able to test rigorous theory predictions concerning Nambu-Goldstone bosons.

CHINESE PHYSICS LETTERS (2021)

Article Astronomy & Astrophysics

Spectral functions of confined particles

Daniele Binosi et al.

PHYSICS LETTERS B (2020)

Article Physics, Multidisciplinary

Neutron Valence Structure from Nuclear Deep Inelastic Scattering

E. P. Segarra et al.

PHYSICAL REVIEW LETTERS (2020)

Article Multidisciplinary Sciences

Empirical Consequences of Emergent Mass

Craig D. Roberts

SYMMETRY-BASEL (2020)

Review Physics, Multidisciplinary

REVIEW OF PARTICLE PHYSICS

P. A. Zyla et al.

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS (2020)

Article Astronomy & Astrophysics

Semileptonic decays of D(s) mesons

Z-Q Yao et al.

PHYSICAL REVIEW D (2020)

Article Physics, Multidisciplinary

Spectrum of Light- and Heavy-Baryons

S. -X. Qin et al.

FEW-BODY SYSTEMS (2019)

Article Multidisciplinary Sciences

A small proton charge radius from an electron-proton scattering experiment

W. Xiong et al.

NATURE (2019)

Article Astronomy & Astrophysics

Distribution amplitudes of heavy-light mesons

Daniele Binosi et al.

PHYSICS LETTERS B (2019)

Article Astronomy & Astrophysics

Scattering amplitudes and contour deformations

Gernot Eichmann et al.

PHYSICAL REVIEW D (2019)

Article Astronomy & Astrophysics

Nucleon-to-Roper electromagnetic transition form factors at large Q2

Chen Chen et al.

PHYSICAL REVIEW D (2019)

Review Astronomy & Astrophysics

Frame- and Metric-Like Higher-Spin Fermions

Rakibur Rahman

UNIVERSE (2018)

Article Astronomy & Astrophysics

Threshold energies and poles for hadron physical problems by a model-independent universal algorithm

R. -A. Tripolt et al.

PHYSICS LETTERS B (2017)

Article Physics, Multidisciplinary

Nucleon-nucleon correlations, short-lived excitations, and the quarks within

Or Hen et al.

REVIEWS OF MODERN PHYSICS (2017)

Review Physics, Nuclear

The PDF4LHC report on PDFs and LHC data: results from Run I and preparation for Run II

Juan Rojo et al.

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS (2015)

Article Astronomy & Astrophysics

Contact-interaction Faddeev equation and, inter alia, proton tensor charges

Shu-Sheng Xu et al.

PHYSICAL REVIEW D (2015)

Article Physics, Multidisciplinary

Nucleon and Elastic and Transition Form Factors

Jorge Segovia et al.

FEW-BODY SYSTEMS (2014)

Article Astronomy & Astrophysics

Nucleon spin structure at very high x

Craig D. Roberts et al.

PHYSICS LETTERS B (2013)

Review Physics, Nuclear

Hard probes of short-range nucleon-nucleon correlations

J. Arrington et al.

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS (2012)

Article Astronomy & Astrophysics

Nucleon electromagnetic form factors from the covariant Faddeev equation

G. Eichmann

PHYSICAL REVIEW D (2011)

Article Physics, Multidisciplinary

Nucleon Mass from a Covariant Three-Quark Faddeev Equation

G. Eichmann et al.

PHYSICAL REVIEW LETTERS (2010)

Article Physics, Multidisciplinary

Nucleon and pion distribution functions in the valence region

Roy J. Holt et al.

REVIEWS OF MODERN PHYSICS (2010)

Review Physics, Multidisciplinary

The EMC effect

PR Norton

REPORTS ON PROGRESS IN PHYSICS (2003)

Article Astronomy & Astrophysics

Neutron structure function and A=3 mirror nuclei

IR Afnan et al.

PHYSICS LETTERS B (2000)