Anticyclotomic p-adic L-function of central critical Rankin-Selberg L-value

Abstract

Let M be an imaginary quadratic field, f a Hecke eigenform on GL2(Q) and \pi the unitary base-change to M of the automorphic representation associated to f. Take a unitary arithmetic Hecke character \chi of M inducing the inverse of the central character of f. The celebrated formula of Waldspurger relates the square of an integral L(f) of f and \chi over the idele class group of M to the central critical value L(1/2,{\pi}\otimes{\chi}). In this paper, we present a construction of a new p-adic L-function that interpolates L(f) over arithmetic characters for a cusp form f in the spirit of the landmark result of Katz where he did that for Eisenstein series.