At a proton-proton collider the cross section for producing a boson is

PHYSICS · Subjective · Fermi University Physics · Particle Physics & Quantum Fields · Particles, interactions and experiment · Particles, interactions and experiment

Particle Physics, Ch Detectors, event reconstruction and claiming a discovery

Problem

At a proton-proton collider the cross section for producing a ZZ boson is σ(pp→Z)=60 nb\sigma(pp\to Z) = 60\,\mathrm{nb}. The branching ratio for Z→e+e−Z\to e^+e^- is B=3.36%\mathcal{B} = 3.36\%, and the combined efficiency for detecting and selecting such a pair is ε=0.70\varepsilon = 0.70. An integrated luminosity of ∫L dt=20 pb−1\int\mathcal{L}\,\mathrm{d}t = 20\,\mathrm{pb}^{-1} is collected. Estimate the number of reconstructed Z→e+e−Z\to e^+e^- events.

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