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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...

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Detalles Bibliográficos
Autores principales: Delgado, Antonio, Espinosa, Jose R., No, Jose Miguel, Quiros, Mariano
Lenguaje:eng
Publicado: 2008
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.79.055011
http://cds.cern.ch/record/1150034
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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.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2008
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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
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