Observation of Diffractively Produced W and Z Bosons in pbar-p Collisions at root-s = 1800 GeV

Abstract

Using the D0 detector, we have observed events produced in pbar-p collisions that contain W or Z bosons in conjunction with very little energy deposition (``rapidity gaps'') in large forward regions of the detector. The fraction of W boson events with a rapidity gap (a signature for diffraction) is 0.89\pm^{0.19}_{0.17}%, and the probability that the non-diffractive background fluctuated to yield the observed diffractive signal is 3 x 10^{-14}, corresponding to a significance of 7.5 sigma. The Z boson sample has a gap fraction of 1.44 \pm^{0.61}_{0.52}%, with a significance of 4.4 sigma. The diffractive events have very similar properties to the more common non-diffractive component.

arXiv comment14 pages, 5 figures, submitted to PLB

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• Hard diffraction from parton rescattering in QCD
• Diffractive W and Z Production at the Fermilab Tevatron
• Diffractive hadroproduction of W and Z bosons at high energies
• Production of Z^0 bosons with rapidity gaps: exclusive photoproduction in gamma p and p p collisions and inclusive double diffractive Z^0's
• Forward Energy Flow, Central Charged-Particle Multiplicities, and Pseudorapidity Gaps in W and Z Boson Events from pp Collisions at 7 TeV
• Diffractive W production at hadron colliders as a test of colour singlet exchange mechanisms
• Single-diffractive production of charmed mesons at the LHC within the $k_t$-factorization approach
• Forward detectors around the CMS interaction point at LHC and their physics potential
• Investigating diffractive W production in hadron-hadron collisions at high energies