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Note on Unparticle Decays
The coupling of an unparticle operator O_U to Standard Model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization ef...
Autores principales: | , , , |
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Lenguaje: | eng |
Publicado: |
2008
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.79.055011 http://cds.cern.ch/record/1150034 |
_version_ | 1780915648738623488 |
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author | Delgado, Antonio Espinosa, Jose R. No, Jose Miguel Quiros, Mariano |
author_facet | Delgado, Antonio Espinosa, Jose R. No, Jose Miguel Quiros, Mariano |
author_sort | Delgado, Antonio |
collection | CERN |
description | The coupling of an unparticle operator O_U to Standard Model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization effects from virtual SM particles. We find that the propagator of a scalar unparticle (of scaling dimension 1 < d_U < 2) with a mass gap m_g develops an isolated pole, m_p^2-i m_p Gamma_p, with m_p^2 < m_g^2 below the unparticle continuum that extends above m_g (showing that the theory would be unstable without a mass gap). If that pole lies below the threshold for decay into two standard model particles the pole corresponds to a stable unparticle state (and its width Gamma_p is zero). For m_p^2 above threshold the width is non zero and related to the unparticle decay rate into Standard Model particles. This picture is valid for any value of d_U in the considered range. |
id | cern-1150034 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2008 |
record_format | invenio |
spelling | cern-11500342023-03-14T20:30:25Zdoi:10.1103/PhysRevD.79.055011http://cds.cern.ch/record/1150034engDelgado, AntonioEspinosa, Jose R.No, Jose MiguelQuiros, MarianoNote on Unparticle DecaysParticle Physics - PhenomenologyThe coupling of an unparticle operator O_U to Standard Model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization effects from virtual SM particles. We find that the propagator of a scalar unparticle (of scaling dimension 1 < d_U < 2) with a mass gap m_g develops an isolated pole, m_p^2-i m_p Gamma_p, with m_p^2 < m_g^2 below the unparticle continuum that extends above m_g (showing that the theory would be unstable without a mass gap). If that pole lies below the threshold for decay into two standard model particles the pole corresponds to a stable unparticle state (and its width Gamma_p is zero). For m_p^2 above threshold the width is non zero and related to the unparticle decay rate into Standard Model particles. This picture is valid for any value of d_U in the considered range.The coupling of an unparticle operator O_U to Standard Model particles opens up the possibility of unparticle decays into standard model fields. We study this issue by analyzing the pole structure (and spectral function) of the unparticle propagator, corrected to account for one-loop polarization effects from virtual SM particles. We find that the propagator of a scalar unparticle (of scaling dimension 1 < d_U < 2) with a mass gap m_g develops an isolated pole, m_p^2-i m_p Gamma_p, with m_p^2 < m_g^2 below the unparticle continuum that extends above m_g (showing that the theory would be unstable without a mass gap). If that pole lies below the threshold for decay into two standard model particles the pole corresponds to a stable unparticle state (and its width Gamma_p is zero). For m_p^2 above threshold the width is non zero and related to the unparticle decay rate into Standard Model particles. This picture is valid for any value of d_U in the considered range.arXiv:0812.1170CERN-PH-TH-2008-231IFT-UAM-CSIC-08-82UAB-FT-658CERN-PH-TH-2008-231oai:cds.cern.ch:11500342008-12-08 |
spellingShingle | Particle Physics - Phenomenology Delgado, Antonio Espinosa, Jose R. No, Jose Miguel Quiros, Mariano Note on Unparticle Decays |
title | Note on Unparticle Decays |
title_full | Note on Unparticle Decays |
title_fullStr | Note on Unparticle Decays |
title_full_unstemmed | Note on Unparticle Decays |
title_short | Note on Unparticle Decays |
title_sort | note on unparticle decays |
topic | Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1103/PhysRevD.79.055011 http://cds.cern.ch/record/1150034 |
work_keys_str_mv | AT delgadoantonio noteonunparticledecays AT espinosajoser noteonunparticledecays AT nojosemiguel noteonunparticledecays AT quirosmariano noteonunparticledecays |