Dear All members,
We are pleased to announce a Journal club by Seokhoon Yun.
* Title: The interpretation for Galactic Center
Excess and Electroweak
Phase Transition in the NMSSM
* Speaker: Seokhoon Yun (IBS-CTPU)
* Date: 12:00-1:00 PM, 26 June 2015
* Abstract: The gamma-ray excess observed by the
Fermi-LAT in the Galactic
Center can be interpreted by the dark matter annihilation to bb¯ via a
light pseudoscalar in the NMSSM. It is interesting to note that the
corresponding singlet scalar is useful to achieve a strongly first order
phase transition required by the electroweak baryogenesis. In this paper,
we investigate the possibility that the NMSSM model can simultaneously
accommodate these two issues. The phase transition strength can be
characterized by the vacua energy gap at zero temperature and be
sufficiently enhanced by the tree-level effect in the NMSSM. We find that
the annihilation of Singlino/Higgsino DM particles occurring close to the
light pseudoscalar resonance is favored by the galactic center excess and
the observed DM relic density, and a resulting small κ/λ and a negative Aκ
can also lead to a successful strongly first order electroweak phase
transition.
* References: arXiv:1503.03749
※ If you would like a sandwich for lunch, please visit the website below and sign up by 11:00am on Thursday. This will be regarded as a confirmation of your attendance.
[ http://doodle.com/d76evxseuwffdu9g ]
We look forward to your participation in the Journal club.
Thank you.
Sincerely,
Sung Yeop Na