Lyndon B. Johnson Lyndon B. Johnson Lyndon Baines Johnson (; August 27, 1908January 22, 1973), often referred to by his initials LBJ, was an American politician who served as the 36th President of the United States from 1963 to 1969. Formerly the 37th Vice President of the United States from 1961 to 1963, he assumed the presidency following the assassination of President John F. Kennedy. A Democrat from Texas, Johnson also served as a United States Representative and as the Majority Leader in the United States Senate. Johnson is one of only four people who have served in all four federal elected positions.
B − L if we assume the seesaw mechanism. In the case of a gauged , the gauge bosons associated with this symmetry are commonly called X and Y bosons. The anomalies that would break baryon number conservation and lepton number conservation individually cancel in such a way that is always conserved. One hypothetical example is proton decay where a proton (; ) would decay into a pion (, ) and positron (; ). Weak hypercharge Y is related to via where X is the U(1) symmetry Grand Unified Theory-associated conserved quantum number. B − L In high energy physics, B" − "L