Cargando…
Hierarchies of R-violating interactions from Family Symmetries
We investigate the possibility of constructing models of R-violating LQD Yukawa couplings using a single U(1) flavour-symmetry group and supermultiplet charge assignments that are compatible with the known hierarchies of quark and lepton masses. The mismatch of mass and current eigenstates inferred...
Autores principales: | , , |
---|---|
Lenguaje: | eng |
Publicado: |
1998
|
Materias: | |
Acceso en línea: | https://dx.doi.org/10.1016/S0550-3213(98)00423-4 http://cds.cern.ch/record/348724 |
_version_ | 1780892097621000192 |
---|---|
author | Ellis, John R. Lola, Smaragda Ross, Graham G. |
author_facet | Ellis, John R. Lola, Smaragda Ross, Graham G. |
author_sort | Ellis, John R. |
collection | CERN |
description | We investigate the possibility of constructing models of R-violating LQD Yukawa couplings using a single U(1) flavour-symmetry group and supermultiplet charge assignments that are compatible with the known hierarchies of quark and lepton masses. The mismatch of mass and current eigenstates inferred from the known charged-current mixing induces the propagation of strong phenomenological constraints on some R-violating couplings to many others. Applying these constraints, we look for flavour-symmetry models that are consistent with different squark-production hypotheses devised to explain the possible HERA large-Q^2 anomaly. The e^+ d -> stop interpretation of the HERA data is accommodated relatively easily, at the price of postulating an extra parity. The e^+ s -> stop interpretation of the events requires models to have only small (2,3) mixing in the down quark sector. The e^+ d -> scharm mechanism cannot be accommodated without large violations of squark-mass universality, due to the very strong experimental constraints on R-violating operators. We display a model in which baryon decay due to dangerous dimension-five operators is automatically suppressed. |
id | cern-348724 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 1998 |
record_format | invenio |
spelling | cern-3487242023-03-14T17:01:23Zdoi:10.1016/S0550-3213(98)00423-4http://cds.cern.ch/record/348724engEllis, John R.Lola, SmaragdaRoss, Graham G.Hierarchies of R-violating interactions from Family SymmetriesParticle Physics - PhenomenologyWe investigate the possibility of constructing models of R-violating LQD Yukawa couplings using a single U(1) flavour-symmetry group and supermultiplet charge assignments that are compatible with the known hierarchies of quark and lepton masses. The mismatch of mass and current eigenstates inferred from the known charged-current mixing induces the propagation of strong phenomenological constraints on some R-violating couplings to many others. Applying these constraints, we look for flavour-symmetry models that are consistent with different squark-production hypotheses devised to explain the possible HERA large-Q^2 anomaly. The e^+ d -> stop interpretation of the HERA data is accommodated relatively easily, at the price of postulating an extra parity. The e^+ s -> stop interpretation of the events requires models to have only small (2,3) mixing in the down quark sector. The e^+ d -> scharm mechanism cannot be accommodated without large violations of squark-mass universality, due to the very strong experimental constraints on R-violating operators. We display a model in which baryon decay due to dangerous dimension-five operators is automatically suppressed.We investigate the possibility of constructing models of R-violating LQD Yukawa couplings using a single U(1) flavour-symmetry group and supermultiplet charge assignments that are compatible with the known hierarchies of quark and lepton masses. The mismatch of mass and current eigenstates inferred from the known charged-current mixing induces the propagation of strong phenomenological constraints on some R-violating couplings to many others. Applying these constraints, we look for flavour-symmetry models that are consistent with different squark-production hypotheses devised to explain the possible HERA large-Q^2 anomaly. The e^+ d -> stop interpretation of the HERA data is accommodated relatively easily, at the price of postulating an extra parity. The e^+ s -> stop interpretation of the events requires models to have only small (2,3) mixing in the down quark sector. The e^+ d -> scharm mechanism cannot be accommodated without large violations of squark-mass universality, due to the very strong experimental constraints on R-violating operators. We display a model in which baryon decay due to dangerous dimension-five operators is automatically suppressed.We investigate the possibility of constructing models of R- violating LQ D Yukawa couplings using a single U (1) flavour-symmetry group and supermultiplet charge assignments that are compatible with the known hierarchies of quark and lepton masses. The mismatch of mass and current eigenstates inferred from the known charged-current mixing induces the propagation of strong phenomenological constraints on some R -violating couplings to many others. Applying these constraints, we look for flavour-symmetry models that are consistent with different squark-production hypotheses devised to explain the possible HERA large- Q 2 anomaly. The e + d → t interpretation of the HERA data is accommodated relatively easily, at the price of postulating an extra parity. The e + s → t interpretation of the events requires models to have only small (2,3) mixing in the down quark sector. The e + d → c mechanism cannot be accommodated without large violations of squark-mass universality, due to the very strong experimental constraints on R -violating operators. We display a model in which baryon decay due to dangerous dimension-five operators is automatically suppressed.hep-ph/9803308CERN-TH-97-205OUTP-98-21-PCERN-TH-97-205OUTP-98-21-Poai:cds.cern.ch:3487241998-03-12 |
spellingShingle | Particle Physics - Phenomenology Ellis, John R. Lola, Smaragda Ross, Graham G. Hierarchies of R-violating interactions from Family Symmetries |
title | Hierarchies of R-violating interactions from Family Symmetries |
title_full | Hierarchies of R-violating interactions from Family Symmetries |
title_fullStr | Hierarchies of R-violating interactions from Family Symmetries |
title_full_unstemmed | Hierarchies of R-violating interactions from Family Symmetries |
title_short | Hierarchies of R-violating interactions from Family Symmetries |
title_sort | hierarchies of r-violating interactions from family symmetries |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1016/S0550-3213(98)00423-4 http://cds.cern.ch/record/348724 |
work_keys_str_mv | AT ellisjohnr hierarchiesofrviolatinginteractionsfromfamilysymmetries AT lolasmaragda hierarchiesofrviolatinginteractionsfromfamilysymmetries AT rossgrahamg hierarchiesofrviolatinginteractionsfromfamilysymmetries |