A Remarkable Relation in the Gauge Sector of Electroweakdynamics

Abstract

A precise empirical relation between the electromagnetic coupling alpha(m_Z) and sin^2(theta^ell_{eff}) --where theta^ell_{eff} is the effective electroweak mixing angle extracted from Z leptonic decays-- is made manifest: alpha(m_Z) = sin^3(theta^ell_{eff})*cos(theta^\ell_{eff}}/(4\pi}.

Comments: 4 pages. Talk given in the X Mexican School on Particles and Fields, Playa del Carmen, Mexico, 2002