ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Eibun Senaha (NCTS)
Title: Electroweak baryogenesis in the MSSM revisited
Date (JST): Thu, Mar 31, 2011, 14:00 - 15:00
Place: Seminar Room A
Related File: 445.pdf
Abstract: It is well known that a light Higgs boson is required to be consistent with
the sucessful sphaleron decoupling in the MSSM baryogenesis scenario.
On the other hand, the experimental results such as the LEP and B physics data
put a strong constraint on such a light Higgs boson.
Although the possible region is arguned in the literature,
some overlooked issues may exist in the analysis, giving rise to the
question about the feasibility of the MSSM baryogenesis.
To obtain the convincing answer, the theoretical uncertainties must be reduced.

In this talk, I will discuss the 2 topics, (i) the sphaleron decoupling condition and
(ii) the validity of the high-temperature expansion used in the 2-loop effective potential.
In our analysis, the sphaleron decoupling condition is updated taking the temperature
effects into account based on the 1-loop finite temperature effective potential.
Regarding (ii), since the complete 2-loop calculation of the effective potential
is still ongoing, I will, as a first step, consider a toy model to examine the validity of the
high-temperature expansion.
Contact: Matsumoto
Remarks: start time subject to change