How can the results on N structure affect the exploration of the - PowerPoint PPT Presentation

How can the results on N ∗ structure affect the exploration of the ground state nucleon and meson structure, and vice versa? Strong QCD from Hadron Structure Experiments 2019 Jefferson Lab, USA, 5-9 November 2019 Exploration of the ground state nucleon and meson structure 1/5

��� ���� ���� � �� � �������� ���� ��� � �� ���� ��� � ���� ��� ���� ������� ���� ������ ��� ��� ��� ��� ��� � �� Non-perturbative QCD: Process-independent effective-charge and quark mass generation D. Binosi et al. , Phys. Rev. D96 (2017) 054026. A. Deur et al. , Prog. Part. Nucl. Phys. 90 (2016) 1-74. M.S. Bhagwat et al. , Phys.Rev. C68 (2003) 015203 ���� � / ���� Rapid acquisition of mass is 0.4 ���� ���� ( ���� ) effect of gluon cloud ���� ���� ( ���� ) 0.3 m = 0 (Chiral limit) M(p) [GeV] m = 30 MeV m = 70 MeV � ( � )/ � 0.2 ���� ���� / ���� ���� ���� / ���� 0.1 0 0 1 2 3 p [GeV] � [ ��� ] 10 years of gauge sector studies confirming 20 years of quark dynamics studies ! Exploration of the ground state nucleon and meson structure 2/5

Consequences on the pion Form Factor PDF 0.4 x p π ( x; ζ 5 ) 0.2 0.0 0.0 0.2 0.4 0.6 0.8 1.0 x A.C. Aguilar et al. , Eur. Phys. J. A 55 (2019) 190 Exploration of the ground state nucleon and meson structure 3/5

� � � � � � � � � � �� � � � � � � � � �� � � � � The Baryon case ☞ EM form Factors of the proton and neutron: see J. Segovia talk and J. Segovia et al. , Few Body Syst. 55 (2014) 1185-1222 1.0 � � 0.6 QCD-kindred p p � G M QCD-kindred n � G M �� � n � � 0.4 0.5 Μ p G E Μ n G E � � 0.2 CI-model CI-model 0.0 0.0 0 1 2 3 4 5 6 7 8 9 10 0 2 4 6 8 10 12 2 � GeV 2 � 2 � GeV 2 � Q Q The existence and location of a zero crossing is a consequence of the underlying dynamics of QCD. Exploration of the ground state nucleon and meson structure 4/5

From ground to excited states ☞ Transition FFs of the ∆ ☞ Nucleon and Roper PDAs: Y. Lu et al. , Phys.Rev. D100 (2019) no.3, 034001 C. Mezrag et al. , Phys. Lett. B783 (2018) 263 0.2 0.8 0.4 u � x 2 � 0.6 d � x 3 � 0.6 0.4 0.8 0.2 ☞ Transition FFs of the Roper resonance. 0.2 0.4 0.6 0.8 u � x 1 � C. Chen et al. , Phys. Rev. D99 (2019) 034013 0.3 5 0.2 & x F 1, p ●● 0.8 * ● ● ● ● 3 0.2 Roper + 0.4 u � x 2 � -Roper 0 0.6 d � x 3 � - x F 1, n 1 0.6 * 0.1 ● 0.4 ● ● 0.8 � 1 ● ● 0 0.2 0 2 4 6 8 10 12 � 3 x = Q 2 / m N 2 0.2 0.4 0.6 0.8 u � x 1 � Exploration of the ground state nucleon and meson structure 5/5