Measurement of the Proton Structure Function ${F_2}$ at low ${x}$ and low ${Q^2}$ at HERA

Physics – High Energy Physics – High Energy Physics - Experiment

Scientific paper

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29 pages, latex, 6 figures appended as uuencoded file. Author list corrected

Scientific paper

10.1007/s002880050064

We report on a measurement of the proton structure function $F_2$ in the range $3.5\times10^{-5}\leq x \leq 4\times10^{-3}$ and 1.5 ${\rm GeV^2} \leq Q^2 \leq15$ ${\rm GeV^2}$ at the $ep$ collider HERA operating at a centre-of-mass energy of $\sqrt{s} = 300$ ${\rm GeV}$. The rise of $F_2$ with decreasing $x$ observed in the previous HERA measurements persists in this lower $x$ and $Q^2$ range. The $Q^2$ evolution of $F_2$, even at the lowest $Q^2$ and $x$ measured, is consistent with perturbative QCD.

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