Physicists call the ELEMENTARY theoretical framework that describes the interactions PARTICLES between elementary building blocks (quarks and leptons)and the force carriers (bosons)the Standard Model. syueno charm Gravity is not yet part of strange bottom this framework,and a central question of 21st century particle physics is clectron neutrino muon neutrino tau ncutrino the search for a quantum formulation of gravity cectron that could be included in the Standard Model. Three Generations of Matter 娄Fermilab95-759 Physicists call the theoretical framework that describes the interactions between elementary building blocks (quarks and leptons) and the force carriers (bosons) the Standard Model. Gravity is not yet part of this framework, and a central question of 21st century particle physics is the search for a quantum formulation of gravity that could be included in the Standard Model