Rapidity Gap Events in Squark Pair Production at the LHC - High Energy Physics - PhenomenologyReport as inadecuate

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Abstract: The exchange of electroweak gauginos in the $t-$ or $u-$channel allows squarkpair production at hadron colliders without color exchange between the squarks.This can give rise to events where little or no energy is deposited in thedetector between the squark decay products. We discuss the potential fordetection of such rapidity gap events at the Large Hadron Collider LHC. Ournumerical analysis is divided into two parts. First, we evaluate in asimplified framework the rapidity gap signal at the parton level. The secondpart covers an analysis with full event simulation using PYTHIA as well asHerwig++, but without detector simulation. We analyze the transverse energydeposited between the jets from squark decay, as well as the probability offinding a third jet in between the two hardest jets. For the mSUGRA benchmarkpoint SPS1a we find statistically significant evidence for a color singletexchange contribution. The systematical differences between current versions ofPYTHIA and HERWIG++ are larger than the physical effect from color singletexchange; however, these systematic differences could be reduced by tuning bothMonte Carlo generators on normal QCD di-jet data.

Author: Sascha Bornhauser, Manuel Drees, Herbert K. Dreiner, Jong Soo Kim

Source: https://arxiv.org/

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