Tevatron collider program- physics, results, future? ∗

USA, is presented. The physics goals of the program itself, the Tevatron ac-celerator design characteristics and some of its achievements are described. A selected set of the past and ongoing physics analyses and measurements performed by CDF and D0 collaborations are summarized. Also, in view of the modified plans and schedule of the Large Hadron Collider (LHC) at CERN, the future of the Tevatron program is discussed. PACS numbers: PACS 13.88.-b,14.20.Mr,14.40.Nd,14.64.Ha,14.80.Bn Standard Model (and beyond) The current (since ∼1975) understanding of elementary particles and their strong and electro-weak interactions in given by the Standard Model [1], a gauge theory based on the following symmetries: SU(3)c × SU(2)I × U(1)Y The SU(3) is an unbroken symmetry of quantum-chromodynamics (QCD), a quantum theory of strong interactions whose carriers (gluons) are massless and couple to color (strong force charge). The SU(2) × U(1) is a gauge symmetry of the electroweak interactions. It is spontaneously broken by the Brout-Englert-Higgs mechanism, which gives masses to the electroweak bosons (W+,W−, Zo and a massless photon) and all fermions. In the Minimal Standard Model (MSM), the Higgs sector is the simplest possible: it contains two complex Higgs fields, which after giving masses to W+,W−, Zo, leave a single neutral scalar Higgs particle which should be discovered. Matter is built of fermions- quarks and leptons, there are three families of each, with the corresponding antiparticles; quarks com