Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-05
Phys.Rev.D79:055011,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 4 figures
Scientific paper
10.1103/PhysRevD.79.055011
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.
Delgado Antonio
Espinosa Jose Ramon
No Jose M.
Quiros Mariano
No associations
LandOfFree
A Note on Unparticle Decays does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Note on Unparticle Decays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Note on Unparticle Decays will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-365961