Natural solution to the supersymmetry Electroweak Fine-Tuning Problem Tianjun Li Institute of Theoretical Physics, Chinese Academy of Sciences Yellow Mountain, May 9, 2014
Natural Solution to the Supersymmetry Electroweak Fine-Tuning Problem Tianjun Li Institute of Theoretical Physics, Chinese Academy of Sciences Yellow Mountain, May 9, 2014
Outline ·I. Introduction II. The SUSY ew Fine-Tuning problem I. The Mssm with the Heavy LsP ⅣV.No- Scale f-su(5) V. General Natural Solution ⅵI. Summary
Outline • I. Introduction • II. The SUSY EW Fine-Tuning Problem • III. The MSSM with the Heavy LSP • IV. No-Scale F-SU(5) • V. General Natural Solution • VI. Summary
I ntroduction Standard Model: Fine-tuning problems: cosmological constant problem; gauge hierarchy problem; strong CP problem: SM fermion masses and mIxIngs. Aesthetic problems: Interaction and fermion unification; gauge coupling unification; charge quantization; too many parameters;
I. Introduction
Gauge Hierarchy problem C=AHff+AsIHPISI 入s △mH 8724V+16724UV f H H (b)
Gauge Hierarchy Problem 4
Solutions: e Techicolor: the higgs is a condensation of new fermions. Point: no amental scalar Larger extra dimension(s) Arkani-Hamed-Dimopoulos-Dvali (ADD)and Randall-Sundrum(RS). Point: the high-dimensional Planck scale is close to the tev ● Supersymmetry. e Little higgs model effective theories for compositeness. the anthropic solution, etc