Abstract
We consider the central exclusive production of high E_T jets pprightarrow p+(X+mathrm{dijet})+p. In particular we study the possible contamination of the purely exclusive signal by semi-exclusive production where no other secondaries are emitted in one hemisphere, between the highest E_T dijet and the recoil proton, while in the other hemisphere a third jet, plus possibly additional hadron activity, is allowed, but still separated from the incoming proton by a large rapidity gap. This process arising from the fusion of a hard and a soft Pomeron has not been considered before. It turns out that it gives a negligible contribution. The calculation involves a careful treatment of the QCD colour structure of the amplitudes.
Highlights
Central Exclusive Production (CEP) of high ET jets is of interest for at least two reasons
Due to its relatively large cross section it plays the role of a ‘standard candle’ for the calculations of different CEP cross sections [1]; in particular, for the evaluation of the chance to observe new Beyond the Standard Model (BSM) physics in the clean environment provided by CEP kinematics
We have considered the possibility of semi-exclusive high ET dijet production accompanied by a third jet with smaller transverse momentum plus the possibility of additional radiation coming from soft Pomeron spectators
Summary
Central Exclusive Production (CEP) of high ET jets is of interest for at least two reasons. 3, we obtain an expression for the effective luminosity, corresponding to ‘hard’-to-‘soft’ (CEP⊗DPE) Pomeron-Pomeron fusion, for this semi-exclusive process and to describe its main elements, in particular, the Sudakov T -factor and incoming parton distributions Recall that this effective luminosity includes all the components which are driven by the relatively soft scale fixed by the transverse momentum, k ET , of a relatively soft third jet.
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