Flavored co-annihilations

Chowdhury, Debtosh and Garani, Raghuveer and Vempati, Sudhir K (2012) Flavored co-annihilations. In: Journal of High Energy Physics (6).

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Abstract

Neutralino dark matter in supersymmetric models is revisited in the presence of flavor violation in the soft supersymmetry breaking sector. We focus on flavor violation the sleptonic sector and study the implications for the co-annihilation regions. Flavor is introduced by a single (mu) over tilde (R) - (T) over tilde (R) insertion in the slepton mass matrix. Limits on insertion from BR(tau -> mu + gamma) are weak in some regions of the parameter space where happen within the amplitudes. We look for overlaps in parameter space where the co-annihilation condition as well as the cancellations within the amplitudes occur. mSUGRA, such overlap regions are not existent, whereas they are present in models non-universal Higgs boundary conditions (NUHM). The effect of flavor violation is fold: (a) it shifts the co-annihilation regions towards lighter neutralino masses (b) co-annihilation cross sections would be modified with the inclusion of flavor violating which can contribute significantly. Even if flavor violation is within the presently limits, this is sufficient to modify the thermally averaged cross-sections by about 15)% in mSUGRA and (20{30)% in NUHM, depending on the parameter space. In overlap regions, the flavor violating cross sections become comparable and in some even dominant to the flavor conserving ones. A comparative study of the channels is for mSUGRA and NUHM cases.

Item Type:	Journal Article
Publication:	Journal of High Energy Physics
Publisher:	Institute of Physics
Additional Information:	Copyright for this article is belongs to Institute of Physics.
Keywords:	Supersymmetry Phenomenology
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	23 Nov 2012 06:26
Last Modified:	23 Nov 2012 06:26
URI:	http://eprints.iisc.ac.in/id/eprint/45152

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