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Flavoured co-annihilation

Chowdhury, D and Garani, R and Vempati, SK (2012) Flavoured co-annihilation. In: PRAMANA-JOURNAL OF PHYSICS, 79 (4, SI). pp. 849-852.

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Official URL: http://dx.doi.org/ 10.1007/s12043-012-0388-0

Abstract

In minimal supergravity (mSUGRA) or CMSSM, one of the main co-annihilating partners of the neutralino is the lightest stau, (tau) over tilde (1). In the presence of flavour violation in the right-handed sector, the co-annihilating partner would be a flavour mixed state. The flavour effect is two-fold: (a) It changes the mass of (tau) over tilde (1) thus modifying the parameter space of the co-annihilation and (b) flavour violating scatterings could now contribute to the cross-sections in the early Universe. In fact, it is shown that for large enough delta similar to 0.2, these processes would constitute the dominant channels in co-annihilation regions. The amount of flavour mixing permissible is constrained by flavour violating tau -> mu or tau -> e processes. For Delta(RR) mass insertions, the constraints from flavour violation are not strong enough in some regions of the parameter space due to partial cancellations in the amplitudes. In mSUGRA, the regions with cancelations within LFV amplitudes do not overlap with the regions of co-annihilations. In non-universal Higgs model (NUHM), however, these regions do overlap leading to significant flavoured co-annihilations. At the LHC and other colliders, these regions can constitute for interesting signals.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to INDIAN ACAD SCIENCES, INDIA
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Depositing User: Francis Jayakanth
Date Deposited: 14 Dec 2012 06:05
Last Modified: 14 Dec 2012 06:05
URI: http://eprints.iisc.ac.in/id/eprint/45495

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