Parity-violating nucleon-nucleon force in the 1/Nc expansion

Several experimental investigations have observed parity violation (PV) in nuclear systems - a consequence of the weak force between quarks. We apply the 1/Nc expansion of QCD to the P-violating T-conserving component of the nucleon-nucleon (NN) potential. We show there are two leading-order operato...

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Detalles Bibliográficos
Publicado: 2015
Materias:
Atomic physics
Experimental investigations
Nuclear systems
Nucleon-nucleon
Nucleon-nucleon forces
Parity violation
Phenomenological models
Scattering data
Strong and weak coupling
Elementary particles
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v114_n6_p_Phillips
http://hdl.handle.net/20.500.12110/paper_00319007_v114_n6_p_Phillips
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00319007_v114_n6_p_Phillips
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spelling paper:paper_00319007_v114_n6_p_Phillips2023-06-08T14:58:15Z Parity-violating nucleon-nucleon force in the 1/Nc expansion Atomic physics Experimental investigations Nuclear systems Nucleon-nucleon Nucleon-nucleon forces Parity violation Phenomenological models Scattering data Strong and weak coupling Elementary particles Several experimental investigations have observed parity violation (PV) in nuclear systems - a consequence of the weak force between quarks. We apply the 1/Nc expansion of QCD to the P-violating T-conserving component of the nucleon-nucleon (NN) potential. We show there are two leading-order operators, both of which affect p→p scattering at order Nc. We find an additional four operators at order Nc0sin2θW and six at O(1/Nc). Pion exchange in the PV NN force is suppressed by 1/Nc and sin2θW, providing a quantitative explanation for its nonobservation up to this time. The large-Nc hierarchy of other PV NN force mechanisms is consistent with estimates of the couplings in phenomenological models. The PV observed in p→p scattering data is compatible with natural values for the strong and weak coupling constants: there is no evidence of fine-tuning. © 2015 American Physical Society. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v114_n6_p_Phillips http://hdl.handle.net/20.500.12110/paper_00319007_v114_n6_p_Phillips
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Atomic physics
Experimental investigations
Nuclear systems
Nucleon-nucleon
Nucleon-nucleon forces
Parity violation
Phenomenological models
Scattering data
Strong and weak coupling
Elementary particles
spellingShingle Atomic physics
Experimental investigations
Nuclear systems
Nucleon-nucleon
Nucleon-nucleon forces
Parity violation
Phenomenological models
Scattering data
Strong and weak coupling
Elementary particles
Parity-violating nucleon-nucleon force in the 1/Nc expansion
topic_facet Atomic physics
Experimental investigations
Nuclear systems
Nucleon-nucleon
Nucleon-nucleon forces
Parity violation
Phenomenological models
Scattering data
Strong and weak coupling
Elementary particles
description Several experimental investigations have observed parity violation (PV) in nuclear systems - a consequence of the weak force between quarks. We apply the 1/Nc expansion of QCD to the P-violating T-conserving component of the nucleon-nucleon (NN) potential. We show there are two leading-order operators, both of which affect p→p scattering at order Nc. We find an additional four operators at order Nc0sin2θW and six at O(1/Nc). Pion exchange in the PV NN force is suppressed by 1/Nc and sin2θW, providing a quantitative explanation for its nonobservation up to this time. The large-Nc hierarchy of other PV NN force mechanisms is consistent with estimates of the couplings in phenomenological models. The PV observed in p→p scattering data is compatible with natural values for the strong and weak coupling constants: there is no evidence of fine-tuning. © 2015 American Physical Society.
title Parity-violating nucleon-nucleon force in the 1/Nc expansion
title_short Parity-violating nucleon-nucleon force in the 1/Nc expansion
title_full Parity-violating nucleon-nucleon force in the 1/Nc expansion
title_fullStr Parity-violating nucleon-nucleon force in the 1/Nc expansion
title_full_unstemmed Parity-violating nucleon-nucleon force in the 1/Nc expansion
title_sort parity-violating nucleon-nucleon force in the 1/nc expansion
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319007_v114_n6_p_Phillips
http://hdl.handle.net/20.500.12110/paper_00319007_v114_n6_p_Phillips
_version_ 1768541597860888576

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