Probing color-singlet exchange in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>+</mml:mo><mml:mn>2</mml:mn><mml:mn/></mml:math>-jet events at the CERN LHC

The purely electroweak process $\mathrm{qq}\ensuremath{\rightarrow}\mathrm{qqZ}$ (via $t$-channel $\frac{\ensuremath{\gamma}}{Z}$ or $W$ exchange) provides a copious and fairly clean source of color-singlet exchange events in $\mathrm{pp}$ collisions at the CERN LHC. A judicious choice of phase-space region allows the suppression of QCD backgrounds to the level of the signal. The color-singlet-exchange signal can be distinguished from QCD backgrounds by the radiation patterns of additional minijets in individual events. A rapidity-gap trigger at the minijet level enhances substantially the signal versus the background. Analogous features of weak-boson scattering events make $Z+2$-jet events at the CERN LHC an ideal laboratory for investigation of the soft-jet activity expected in weak-boson scattering events.

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