Measurement of multijet production at low Bjorken x with ZEUS at HERA 

Inclusive dijet and trijet production in deep inelastic ep scattering 
was measured with ZEUS at HERA using an integrated luminossity of 82pb-1. 
The data cover the kinematic range of 10 < Q2 < 100 GeV2 and Bjorken x 
of 10-4 < xBj < 10-2.  Jets were identified in the hadronic 
centre-of-mass (HCM) frame using the kT cluster algorithm in the 
longitudinally invariant inclusive mode. Measurements of dijet and trijet 
differential cross sections are presented as functions of Q2, xBj, jet 
transverse energy and jet pseudorapidity. To further examine low-xBj 
dynamics, multi-differential cross sections as functions of the jet 
correlations in transverse momenta, azimuthal angles and pseudorapidity 
are also presented. Calculations at O(alpha_s^3) generally 
describe the trijet data well and improve the description of the dijet 
data compared to the calculation at O(alpha_s^2).