In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

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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

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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

Transcript of In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

Page 1: In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

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

Page 2: In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

Outline

• EW Baryogenesis Scenario.• U(1)-MSSM• Phase Transition in the UMSSM.• Conclusion.

A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

Page 3: In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

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

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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

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},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

Page 6: In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

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

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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

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Parameters & Constrains:

A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

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Phase dynamics:

Where:

The transition could occur:

once:

Two steps:

A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

Page 10: In collaboration with S. Nasri (to appear in PRD) Amine AHRICHE Laboratory of Theoretical Physics,

Results:

A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

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A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

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The effective potential has more than one minimum:

A. Ahriche, LPTh Jijel LAPTH-Annecy, January 2011

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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