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A. Ahriche, LPTh Jijel. LAPTH-Annecy, January 2011. A Strong Phase Transition at the Weak Scale within the U(1)-Extended MSSM. In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics, University of Jijel, Algeria. A. Ahriche, LPTh Jijel. - PowerPoint PPT Presentation
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A Strong Phase Transition at the Weak Scale within the U(1)-Extended MSSM
In collaboration with S. Nasri(to appear in PRD)
Amine AHRICHE
Laboratory of Theoretical Physics,University of Jijel, Algeria.
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Outline
• EW Baryogenesis Scenario.• U(1)-MSSM• Phase Transition in the UMSSM.• Conclusion.
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
The SM is very succesful, but... ν ‘masses, gauge unification, hierarchy Pb, BAU, DM, DE..
Many extensions !!
gauge symmetry particles Space-time Exotic models
GUT‘s SU(5), SO(10), LR ..etc
New F, GB, S to The SM
String, ED SUSY, HPGB, Unparticle..etc
MSSM: minimal realisation
fermion↔boson
Succeses: EWPT, Little Hierachy, DM candidate..etc
Failiures: most of SM failures, µ-problem, BAU with light stop...etc
SM, Problems & Extensions
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Baryogenesis (BAU) Pb?
• B violation• C & CP violation• Out-of-equilibrium
Since Dirac: Matter↔Anti-Matter, so where is the anti-matter?
Observations (WMAP):
In 1967, Sakharov criteria:
In the SM (KRS): • B+L anomaly• CKM matrix• Strong first order Phase transition
EW Baryogenesis Scenario
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
},0{ hAi },0{ hAi
},{ hA ii
3 LBThe Sphaleron is the field configuration whose NCS=1/2
• B+L anomaly
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
EW Baryogenesis Scenario (Mechanism)
B,CP/ /
SM: Mh<42 GeV!!!MSSM: Mstop<Mtop
What if the MSSM is extended by U(1)? It is OK but:
Kang, et al. PRL94(2005), but with 3 extra singlets?
Son, et al. PRD76, but with extra heavy singlet fermions?
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Phase Transition in the UMSSMThe Model:Why U(1)-extension? • G is a subgroup of E6
• Anomaly free• inspired from string models!!
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Parameters & Constrains:
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Phase dynamics:
Where:
The transition could occur:
once:
Two steps:
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
Results:
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
The effective potential has more than one minimum:
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
The Minimal U(1)-MSSM extended could give a strong fiest order phase transition without the need of a light stop
The transition could occure in two steps: rich cosmology in (and above) the TeV scale ... needs more investigations
Conclusion
A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011
A new behavior has been remarked, where the EWPT dynamics seems to be different