The project aims at a complete calculation of dijet rates in DIS and photoproduction that removes the standard requirement of asymmetric cuts on transverse energy of the two highest E_T jets. This is acheived via an all order resummation of the energy difference between the two highest E_T jets. Apart from being interesting in order to test multijet resummations against accurate data (in an environment less contaminated by power corrections than several event shapes) the calculation can be used, for instance, to better constrain the gluon density extracted from dijets in photoproduction. There are also applications to prompt photon+jet production at hadron colliders. Published results so far exist for the cone algorithm and without matching to fixed order computations. Broadly speaking the project aims at understanding energy flow outside well defined jet regions (in different algorithms), in the light of recent findings such as non global logs.

Andrea Banfi (NIKHEF), Gennaro Corcella (CERN), Mrinal Dasgupta (CERN),

Theoretical collaboration welcome for extending the existing DIS calculation to photoproduction. Collaboration required with experimentalists for help with comparing to data on DIS and photoproduction

Dijet rates with symmetric E_t cuts, A.Banfi, M. Dasgupta, J. High Energy Phys. 0401 (2004) 027.

We have presented first results for cone dijets produced in DIS and without yet matching to fixed order .
We have recently extended the results to dijets constructed by the inclusive k_t algorithm and we hope to present a comparison with HERWIG and the complete NLO matched result in the October meeting at CERN.

(01.07.2004) Immediately after finishing the DIS work which involves checking that results are in qualitative agreement with HERWIG, then matching to NLO, we will undertake a serious (quantitative) comparison with data and begin work on the extension to photoproduction processes .