Berkovits, N.2014-05-202014-05-202004-07-02Physical Review Letters. College Pk: Amer Physical Soc, v. 93, n. 1, 3 p., 2004.0031-9007http://hdl.handle.net/11449/23794In this Letter, an alternative string theory in twistor space is proposed for describing perturbative N=4 super-Yang-Mills theory. Like the recent proposal of Witten, this string theory uses twistor worldsheet variables and has manifest spacetime superconformal invariance. However, in this proposal, tree-level super-Yang-Mills amplitudes come from open string tree amplitudes as opposed to coming from D-instanton contributions.3engArtigo10.1103/PhysRevLett.93.011601WOS:000222390900006Acesso abertoWOS000222390900006.pdf