Decay of long-lived massive closed superstring states: Exact results

Details Decay of long-lived massive closed superstring states: Exact results Decay of long-lived massive closed superstring states: Exact results

2003-10-30

arxiv.org/abs/hep-th/0310283v2

JHEP 0312 (2003) 014

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 5 figures, 35 pages (= 23 pages + appendices). Minor corrections

Scientific paper

10.1088/1126-6708/2003/12/014

We find a one-parameter family of long-lived physical string states in type II superstring theory. We compute the decay rate by an exact numerical evaluation of the imaginary part of the one-loop propagator. Remarkably, the lifetime rapidly increases with the mass. We find a power-law dependence of the form $T = const. g^{-2} Mass^\alpha$, where the value of $\alpha $ depends on the parameter characterizing the state. For the most stable state in this family, one has $\alpha ~= 5$. The dominant decay channel of these massive string states is by emission of soft massless particles. The quantum states can be viewed semiclassically as closed strings which cannot break during the classical evolution.

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