Sur l'annulation de la valeur centrale de la fonction L de Hecke
  In this note, following results from Henri Cohen and Winfried Kohnen, we show that for all integer k greater than 12 and divisible by 4, there exists a cuspidal eigenform of weight k for the full modular group SL2(Z) such that its Hecke L-function does not vanish on k/2. 
Quentin Gazda
math.NT