blois-2003

Limit on Exclusive DPE Dijets (Run I)1 / N TOT(dN / dE T*)110 -110 -2(a)DPESDND1 / N TOT(dN / dη*)0.60.40.2(b)Observed ~100 DPE dijet events© 0.035 < ξ < 0.095© Jet E T> 7 GeV© Rapidity gap in 2.4 < η < 5.9Dijet mass fractionMRjj=MjjX1 / N TOT(dN / dφ)σ15 10 15 20 25E T* = (E 1 T+E 2 T )/2 (GeV)(c)0.500 1 2 3φ = |φ 1 -φ 2 | (rad)1 / N TOT(dN / dR jj)0-4 -2 0 2 4η* = (η 1 +η 2 )/2(d)1010 0.2 0.4 0.6 0.8 1Dijet Mass FractionM JJ based on energy within cone of 0.7=> look for exclusive dijets in window0.7 < R JJ < 0.9σ(inclusive) = 44.6 ± 4.4(stat) ± 21.6(syst)σ(exclusive) < 3.7 nb (95%CL)nb