A naturally light dilaton and a small cosmological constant Brando Bellazzini, Csaba Csáki, Jay Hubisz, Javi Serra and John Terning Eur. Phys. J. C, 74 3 (2014) 2790 Published online: 15 March 2014 DOI: 10.1140/epjc/s10052-014-2790-x