Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-04-13
Phys.Lett. B472 (2000) 280-286
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, LaTex, 1 figure. Replacement conforms with version to be published in Physics Letters B
Scientific paper
10.1016/S0370-2693(99)01381-7
One-loop diagrams containing a graviton provide a finite contribution to the anomalous magnetic moment $\al$ of a lepton, whether or not the graviton propagates in $n$ large extra compact dimensions. In the present work, the tree graph photoproduction of a graviton, integrated up to an arbitrary cutoff, is shown to violate the Drell-Hearn-Gerasimov sum rule for $\al^2$. The possibility of resurrecting the sum rule from high energy contributions originating in string excitations is discussed in a qualitative manner, and various problems associated with such a program are pointed out.
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