Eur. Phys. J. C 21, 649-657 (2001)
DOI: 10.1007/s100520100747
Factorial correlators: angular scaling within QCD jets
R. Peschanski1 and B. Ziaja2, 31 CEA, Service de Physique Théorique, CE-Saclay, 91191 Gif-sur-Yvette Cedex, France
2 Department of Theoretical Physics, H. Niewodniczanski Institute of Nuclear Physics, 31-342 Cracow, Poland
3 High Energy Physics, Uppsala University, P.O. Box 535, 75121 Uppsala, Sweden
(Received: 12 January 2001 / Published online: 7 September 2001 -© Springer-Verlag / Società Italiana di Fisica 2001 )
Abstract
Factorial correlators measure the amount of dynamical correlation
in the
multiplicity between two separated phase-space windows. We present
the
analytical derivation of factorial correlators for a QCD jet
described at the
double logarithmic (DL) accuracy. We obtain a new angular scaling
property for
properly normalized correlators between two solid-angle cells
or two rings
around the jet axis. Normalized QCD factorial correlators scale
with the
angular distance and are independent of the window size. Scaling
violations
are expected beyond the DL approximation, in particular from
the
subjet structure.
Experimental tests are feasible, and thus would be welcome.
© Società Italiana di Fisica, Springer-Verlag 2001