Flavored co-annihilations


Autoria(s): Chowdhury, Debtosh; Garani, Raghuveer; Vempati, Sudhir K
Data(s)

2012

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.iisc.ernet.in/45152/1/Jou_hig_ene_phy_6-2012.pdf

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

Publicador

Institute of Physics

Relação

http://dx.doi.org/10.1007/JHEP06(2012)014

http://eprints.iisc.ernet.in/45152/

Palavras-Chave #Centre for High Energy Physics
Tipo

Journal Article

PeerReviewed