1 March 2021 © CERN for the benefit of the CMS collaboration 2021 Abstract The production of Z boson pairs in proton– proton (pp) collisions, pp → (Z/γ ∗)(Z/γ ∗) → 2 2 , where , = e or μ, is studied at a center-of-mass energy of 13 TeV with the CMS detector...
In either case, it’s a small amount. Dram came from French through Latin and ultimately from the Greek word drachmē, meaning “handful.” As a unit of weight, a dram is 1/16 of an ounce (and an ounce is 1/16 of a pound). As a liquid measure, a dram is 1/8 of an ounce...
Consider a particle of energy E and mass m decaying to two massless particles, each with an energy E/2 and separated by an angle θ. The mass must satisfy m2 < E2 (1 − cos θ) /2. In the small-angle limit, this would be m2 < E2θ2/4, or m < Eθ/2. With more ...