Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-07-30
JHEP 1101:064,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
57 pages, 31 figures, references added
Scientific paper
10.1007/JHEP01(2011)064
The recent positron excess in cosmic rays (CR) observed by the PAMELA satellite may be a signal for dark matter (DM) annihilation. When these measurements are combined with those from FERMI on the total ($e^++e^-$) flux and from PAMELA itself on the $\bar p/p$ ratio, these and other results are difficult to reconcile with traditional models of DM, including the conventional mSUGRA version of Supersymmetry even if boosts as large as $10^{3-4}$ are allowed. In this paper, we combine the results of a previously obtained scan over a more general 19-parameter subspace of the MSSM with a corresponding scan over astrophysical parameters that describe the propagation of CR. We then ascertain whether or not a good fit to this CR data can be obtained with relatively small boost factors while simultaneously satisfying the additional constraints arising from gamma ray data. We find that a specific subclass of MSSM models where the LSP is mostly pure bino and annihilates almost exclusively into $\tau$ pairs comes very close to satisfying these requirements. The lightest $\tilde \tau$ in this set of models is found to be relatively close in mass to the LSP and is in some cases the nLSP. These models lead to a significant improvement in the overall fit to the data by an amount $\Delta \chi^2 \sim 1/$dof in comparison to the best fit without Supersymmetry while employing boosts $\sim 100$. The implications of these models for future experiments are discussed.
Conley Alexander J.
Cotta R. C.
Gainer James S.
Hewett JoAnne L.
Rizzo Thomas G.
No associations
LandOfFree
Cosmic Ray Anomalies from the MSSM? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Cosmic Ray Anomalies from the MSSM?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic Ray Anomalies from the MSSM? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-701311