Valence quark ratio in the proton

Abstract

Beginning with precise data on the ratio of structure functions in deep inelastic scattering (DIS) from ${}^3$He and ${}^3$H, collected on the domain $0.19\le x_B\le 0.83$, where $x_B$ is the Bjorken scaling variable, we employ a robust method for extrapolating such data to arrive at a model-independent result for the $x_B=1$ value of the ratio of neutron and proton structure functions. Combining this with information obtained in analyses of DIS from nuclei, corrected for target-structure dependence, we arrive at a prediction for the proton's valence-quark ratio: ${d_v/u_v|}_{x_B\to 1}=0.230(57)$. Requiring consistency with this result presents a challenge to many descriptions of proton structure.

6 pages, 3 figures

References in corpus (10)

• Distribution Functions of the Nucleon and Pion in the Valence Region
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• Spectrum of light- and heavy-baryons
• The Asymmetry of Antimatter in the Proton
• Empirical Consequences of Emergent Mass
• Parton distributions of light quarks and antiquarks in the proton
• Pion charge radius from pion+electron elastic scattering data
• Pauli radius of the proton
• Nucleon off-shell structure and the free neutron valence structure from A=3 inclusive electron scattering measurements
• Regarding the distribution of glue in the pion

Cited by in corpus (17)

• The Present and Future of QCD
• QCD Running Couplings and Effective Charges
• Proton and pion distribution functions in counterpoint
• Parton distributions of light quarks and antiquarks in the proton
• Hadron and light nucleus radii from electron scattering
• Nucleon spin decomposition with one dynamical gluon
• Nucleon axial form factor at large momentum transfers
• Origin of the Proton Mass
• Contact interaction analysis of octet baryon axialvector and pseudoscalar form factors
• Composition of low-lying $\mathbf{J}={\frac{3}{2}}^{\pm }\mathbf{\Delta }$-baryons
• Polarised parton distribution functions and proton spin
• Pauli radius of the proton
• Fresh look at experimental evidence for odderon exchange
• The European Muon Collaboration effect in Light-Front Hamiltonian Dynamics
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects
• Flavor asymmetry from the non-perturbative nucleon sea
• Physical Implications of the Extrapolation and Statistical Bootstrap of the Nucleon Structure Function Ratio $\frac{F_2^n}{F_2^p}$ for Mirror Nuclei ${}^3$He and ${}^3$H