Recent progress on QCD inputs for axion phenomenology Claudio Bonati, Massimo D’Elia, Marco Mariti, Guido Martinelli, Michele Mesiti, Francesco Negro, Francesco Sanfilippo and Giovanni Villadoro EPJ Web Conf., 137 (2017) 08004 Published online: 22 March 2017 DOI: 10.1051/epjconf/201713708004