Sentermassenergien

Sentermassenergien is a term that appears in some contexts to denote the energy associated with the center of mass of a physical system. In standard physics, the corresponding quantity is called the center-of-mass energy (often denoted E_cm) or the invariant-mass energy. The idea is tied to the total energy and momentum of a system as viewed in the center-of-mass frame, where the total momentum vanishes.

In relativistic terms, the total four-momentum of a system is P = Σ p_i. The invariant mass M is defined by P^2 = M^2 c^2, or M^2 c^4 = (ΣE)^2 − (Σp c)^2. The center-of-mass energy is related to this invariant mass by E_cm = M c^2; in natural units (c = 1), E_cm^2 = (ΣE)^2 − |Σp|^2. This quantity represents the energy available for particle production in the collision when viewed in the center-of-mass frame.

Applications and measurement: In high-energy collider physics, E_cm sets the scale for which new particles can be produced. For example, proton–proton collisions at modern accelerators are described by a specific E_cm, such as several TeV per collision. In events with missing energy or multiple initial-state particles, the reconstructed E_cm is inferred from the observed final-state particles and conservation laws.

Usage notes: Sentermassenergien is not a universally standardized term and may be encountered mainly in translations or informal discussions. The conventional terminology remains center-of-mass energy or invariant-mass energy. See also center-of-mass frame, invariant mass, and Mandelstam variable s.