On-shell recursion relations for all Born QCD amplitudes | Zendy

Christian Schwinn | Zendy; Stefan Weinzierl | Zendy

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On-shell recursion relations for all Born QCD amplitudes

Author(s) -

Christian Schwinn,

Stefan Weinzierl

Publication year - 2007

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2007/04/072

Subject(s) - helicity , physics , gluon , recursion (computer science) , quark , spinor , particle physics , amplitude , quantum chromodynamics , shell (structure) , quantum electrodynamics , mathematical physics , quantum mechanics , mathematics , materials science , algorithm , composite material

We consider on-shell recursion relations for all Born QCD amplitudes. Thisincludes amplitudes with several pairs of quarks and massive quarks. We give adetailed description on how to shift the external particles in spinor space andclarify the allowed helicities of the shifted legs. We proof that thecorresponding meromorphic functions vanish at z --> infinity. As an applicationwe obtain compact expressions for helicity amplitudes including a pair ofmassive quarks, one negative helicity gluon and an arbitrary number of positivehelicity gluons.Comment: 30 pages, minor change

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