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Origine et manifestation de la brisure de supersymétrie : Phénoménologie de l'annihilation de neutralinos en Zh et WW. Représentation (0,1/2) et dualité.

Abstract : Supersymmetry is an interesting extension of the Standard Model. Hence, its formal and phenomenological aspects need to be understood before establishing it is realized en Nature. Supersymmetry offers a natural darkmatter candidate. To check this hypothesis, a crucial point would be the Indirect Detection of neutralino annihilation products. Among annihilation channels, the one with a Z boson and a Higgs scalar, is of interest because of the hard spectrum it yields. However, the spectra needs to be weighted by branching ratios. The Zh channel is then known to be suppressed. We notice that the deeper broken the supersymmetry, the stronger the suppression. Thus the channel suppression has to be understood in terms of gauge independence of different diagrams involved, and high energy unitarity. A key element of the suppression for this channel is the Z boson polarization, which comes from the initial Majorana particles at rest. Finally, we investigate the role of polarization in the WW channel. Here, polarization does not suppress the channel but modifies the shape of the decay products spectra. This could be important from an experimental point of view. On a more formal side, we point out different kinds of representations of the (0,1/2) multiplet in superspace. First we concentrate on a new kind of superfield called X. We next present a duality in four dimensions, before showing its extension to superspace. Without supersymmetry, this duality links a 3-form to a constant. In superspace, we find that the duality links a 3-form superfield to the new X superfield. It is essential to understand that some components of the 3-form and the X superfield seem to help supersymmetry breaking. Finally we try to transmit this breaking to usual chiral superfields.
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Submitted on : Thursday, December 6, 2007 - 4:10:48 PM
Last modification on : Thursday, February 25, 2021 - 10:58:31 AM
Long-term archiving on: : Thursday, September 27, 2012 - 10:50:56 AM

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  • HAL Id : tel-00194510, version 1

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B. Labonne. Origine et manifestation de la brisure de supersymétrie : Phénoménologie de l'annihilation de neutralinos en Zh et WW. Représentation (0,1/2) et dualité.. Physique des Hautes Energies - Expérience [hep-ex]. Université de la Méditerranée - Aix-Marseille II, 2007. Français. ⟨tel-00194510⟩

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