We consider the non-relativistic four-body system with large scattering
length and short-range interactions within an effective theory with contact
interactions only. We compute the binding energies of the 4He tetramer and of
alpha-particle. The well-known linear correlation between the three-body
binding energies and the four-body binding energies of these physical systems
can be understood as a consequence of the absence of a four-body force at
leading order.Comment: 3 pages, 2 ps figures, oral contribution, 19th European Few-Body
Conference (EFB2004), Groningen, Netherlands, August 23 - August 27, 200
