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• W4283695202 abstract "Abstract Using a Poincaré-covariant quark+diquark Faddeev equation and related symmetry-preserving weak interaction current, we deliver parameter-free predictions for the nucleon axialvector form factor, $$G_A(Q^2)$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msub> <mml:mi>G</mml:mi> <mml:mi>A</mml:mi> </mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msup> <mml:mi>Q</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> , on the domain $$0le x=Q^2/m_N^2le 10$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mn>0</mml:mn> <mml:mo>≤</mml:mo> <mml:mi>x</mml:mi> <mml:mo>=</mml:mo> <mml:msup> <mml:mi>Q</mml:mi> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>/</mml:mo> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mi>N</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> <mml:mo>≤</mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:math> , where $$m_N$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>m</mml:mi> <mml:mi>N</mml:mi> </mml:msub> </mml:math> is the nucleon mass. We also provide a detailed analysis of the flavour separation of the proton $$G_A$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mi>G</mml:mi> <mml:mi>A</mml:mi> </mml:msub> </mml:math> into contributions from valence u and d quarks; and with form factors available on such a large $$Q^2$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>Q</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:math> domain, predictions for the flavour-separated axial-charge light-front transverse spatial density profiles. Our calculated axial charge ratio $$g_A^d/g_A^u=-0.32(2)$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msubsup> <mml:mi>g</mml:mi> <mml:mi>A</mml:mi> <mml:mi>d</mml:mi> </mml:msubsup> <mml:mo>/</mml:mo> <mml:msubsup> <mml:mi>g</mml:mi> <mml:mi>A</mml:mi> <mml:mi>u</mml:mi> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mo>-</mml:mo> <mml:mn>0.32</mml:mn> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>2</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> is consistent with available experimental data and markedly larger in magnitude than the value typical of nonrelativistic quark models. The value of this ratio is sensitive to the strength of axialvector diquark correlations in the Poincaré-covariant nucleon wave function. Working with a realistic axialvector diquark content, the d and u quark transverse density profiles are similar. Some of these predictions could potentially be tested with new data on threshold pion electroproduction from the proton at large $$Q^2$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msup> <mml:mi>Q</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:math> ." @default.
• W4283695202 created "2022-06-30" @default.
• W4283695202 creator A5008862777 @default.
• W4283695202 creator A5063253432 @default.
• W4283695202 date "2022-10-28" @default.
• W4283695202 modified "2023-10-18" @default.
• W4283695202 title "Nucleon axial form factor at large momentum transfers" @default.
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• W4283695202 doi "https://doi.org/10.1140/epja/s10050-022-00848-x" @default.
• W4283695202 hasPublicationYear "2022" @default.
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