Superstring scattering from O-planes

Simpler superstring scattering

We give a new, manifestly spacetime-supersymmetric method for calculating superstring scattering amplitudes, using the ghost pyramid, that is simpler than all other known methods. No pictures nor non-vertex insertions are required other than the usual b and c ghosts of the bosonic string. We evaluate some tree and loop amplitudes as examples. [email protected] and [email protected]...

Cosmic Superstring Scattering in Backgrounds

We generalize the calculation of cosmic superstring reconnection probability to non-trivial backgrounds. This is done by modeling cosmic strings as wound tachyon modes in the 0B theory, and the spacetime effective action is then used to couple this to background fields. Simple examples are given including trivial and warped compactifications. Generalization to (p, q) strings is discussed.

Correlated Scattering and Cluster Planes

We suggest a new correlation in diffractive production of 2 “clusters” A + B → AB with large intrinsic angular momenta for each A and B cluster. These correlations are expected in the context of the “color dipole picture” for high energy collision and reflect the approximate conservation of dipole direction during the collision. This conservation is in particular manifest when the two dipoles, ...

Scattering amplitudes in open superstring theory

Amplitude for N-gluon superstring scattering.

We consider scattering processes involving N gluonic massless states of open superstrings with a certain Regge slope alpha'. At the semiclassical level, the string world-sheet sweeps a disk and N gluons are created or annihilated at the boundary. We present exact expressions for the corresponding amplitudes, valid to all orders in alpha', for the so-called maximally helicity violating configura...