Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-06-21
Phys.Rev.D76:055003,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
37 pages. 16 figures, some additional comments and references
Scientific paper
10.1103/PhysRevD.76.055003
Low energy phenomenology of the unparticle physics associated with an exact scale invariant sector possessing a non-trivial infrared fixed point at a higher energy scale is explored for both electron-positron and hadronic colliders. Feynman rules for a spin 0, 1 or 2 unparticle coupled to a variety of standard model gauge invariant operators that are relevant to many low energy processes involving either real emissions of unparticles or their virtual propagator effects are presented. Missing energy and/or recoil mass distributions of the unparticle in the associated production of unparticle together with a photon or $Z$ boson at LEP2 and ILC as well as in $Z$ decay into an unparticle plus a fermion-antifermion pair are studied. Monojet production at hadronic collisions is explored. The complex phase in the unparticle propagator that can give rise to interesting interference effects between an unparticle exchange diagram and the standard model amplitudes are studied in details for the Drell-Yan process as well as muon pair and diphoton production in electron-positron annihilation. These energy and/or recoil mass distributions (with the exception in hadron colliders) and interference effects are found sensitively depending not only on the scale dimension but also on the spin of the unparticle. For the spin-2 unparticle, its physical effects is found to resemble that of a tower of Kaluza-Klein gravitons, which strongly indicates that the underlying unparticle physics may have root in a higher dimensional theory. A connection between unparticle physics and theories of large extra dimension is speculated. Experimental constraints on the unparticle scale are deduced from the LEP2 data on mono-photon production and from the 4-fermion contact interactions.
Cheung Kingman
Keung Wai-Yee
Yuan Tzu-Chiang
No associations
LandOfFree
Collider Phenomenology of Unparticle Physics 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 Collider Phenomenology of Unparticle Physics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collider Phenomenology of Unparticle Physics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-192707