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We construct a simple theory in which the fine-tuning of the standard modelis significantly reduced. Radiative corrections to the quadratic part of thescalar potential are constrained to be symmetric under a global U(4) x U(4)'symmetry due to a discrete Z_2 "twin" parity, while the quartic part does notpossess this symmetry. As a consequence, when the global symmetry is broken theHiggs fields emerge as light pseudo-Goldstone bosons, but with sizable quarticself-interactions. This structure allows the cutoff scale, \Lambda, to beraised to the multi-TeV region without significant fine-tuning. In the minimalversion of the theory, the amount of fine-tuning is about 15% for \Lambda = 5TeV, while it is about 30% in an extended model. This provides a solution tothe little hierarchy problem. In the minimal model, the "visible" particlecontent is exactly that of the two Higgs doublet standard model, while theextended model also contains extra vector-like fermions with masses ~(1-2)TeV.At the LHC, our minimal model may appear exactly as the two Higgs doubletstandard model, and new physics responsible for cutting off the divergences ofthe Higgs mass-squared parameter may not be discovered. Several possibleprocesses that may be used to discriminate our model from the simple two Higgsdoublet model are discussed for the LHC and for a linear collider.Comment: 22 page

Natural little hierarchy from a partially goldstone twin Higgs