Massive quark scattering at strong coupling from AdS/CFT

Understand

We extend the analysis of Alday and Maldacena for obtaining gluon scattering amplitudes at strong coupling to include external massive quark states.

• Our quarks are actually the N=2 hypermultiplets which arise when D7-brane probes are included in the AdS_5 x S^5 geometry.
• We work in the quenched approximation, treating the N=2 matter multiplets as external sources coupled to the N=4 SYM fields.
• We first derive appropriate massive-particle boundary conditions for the string scattering worldsheets.