Article

Branon radiative corrections to collider physics and precision observables

Physical review D: Particles and fields 11/2005; DOI: 10.1103/PhysRevD.73.035008
Source: arXiv

ABSTRACT In the context of brane-world scenarios, we study the effects produced by the exchange of virtual massive branons. A one-loop calculation is performed which generates higher-dimensional operators involving SM fields suppressed by powers of the brane tension scale. We discuss constraints on this scenario from colliders such as HERA, LEP and Tevatron and prospects for future detections at LHC or ILC. The most interesting phenomenology comes from new four-particles vertices induced by branon radiative corrections, mainly from four fermion interactions. The presence of flexible branes modifies also the muon anomalous magnetic moment and the electroweak precision observables.

0 Bookmarks
 · 
55 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The gamma-ray fluxes observed by the High Energy Stereoscopic System (HESS) from the J1745-290 Galactic Center source is well fitted by the secondary photons coming from Dark Matter (DM) annihilation in particle-antiparticle standard model pairs over a diffuse power-law background. The spectral features of the signal are consistent with different channels: light quarks, electro-weak gauge bosons and top-antitop production. The amount of photons and morphology of the signal localized within a region of few parsecs, require compressed DM profiles as those resulting from baryonic contraction, which offer large enhancements in the signal over DM alone simulations. The fits return a heavy WIMP, with a mass above 10 TeV, but well below the unitarity limit for thermal relic annihilation. The fitted background spectral index is compatible with the Fermi-Large Area Telescope (LAT) data from the same region. This possibility can be potentially tested with the observations of other high energy cosmic rays.
    10/2013;
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: One possible explanation for the present observed acceleration of the Universe is the breakdown of homogeneity and isotropy due to the formation of non-linear structures. How inhomogeneities affect the averaged cosmological expansion rate and lead to late-time acceleration is generally considered to be due to some backreaction mechanism. General Relativity together with pressure-free matter have until recently been considered as the sole ingredients for averaged calculations. In this communication we focus our attention on more general scenarios, including imperfect fluids as well as alternative theories of gravity, and apply an averaging procedure to them in order to determine possible backreaction effects. For illustrative purposes, we present our results for dark energy models, quintessence and Brans-Dicke theories. We also provide a discussion about the limitations of frame choices in the averaging procedure.
    Journal of Cosmology and Astroparticle Physics 12/2013; 2014(05). · 6.04 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We study the possibility of testing some generic properties of brane world scenarios at the LHC. In particular, we pay attention to Kaluza-Klein graviton and branon production. Both signals can be dominant depending on the value of the brane tension. We analyze the differences between these two signatures. Finally, we use recent data in the single photon channel from the ATLAS Collaboration to constrain the parameter space of both phenomenologies.
    Physical Review D 10/2013; 88(7). · 4.69 Impact Factor

Full-text

View
0 Downloads
Available from