Abstract
In the context of a measurement recently performed by the PLUTO Collaboration at PETRA, we have computed the contribution of 2-jet, 3-jet and 4-jet production processes (each involving 2 large-pT jets) in γγ* collisions to the differential cross sectiondσ/(dpTdQ2), whereQ2 is the γ*'s four momentum squared. It results that the total correction to the 2-jet contribution\(\left( {\gamma \gamma ^ * \to q\bar q} \right)\), obtained forpT andQ2 values located in the range 2 GeV<pT<6 GeV and 0.1 GeV2<Q2<12 GeV2 varies rather slowly as a function of those two parameters; it ranges between 30% and 70%. The specific contribution of the higher twist term involving the process\(\gamma \gamma ^ * \to Mq\bar q\) appears to be insignificant. The discrepancy observed between experiment and theory atQ2≲0.3 GeV2 andpT≃2-3.5 GeV is not explained by our results.
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