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

Abstract

We report on a measurement of the proton structure function $F_2$ in the range $3.5\times 10^{-5}\le x\le 4\times 10^{-3}$ and 1.5 $\mathrm{Ge}{\mathrm{V}}^2\le Q^2\le 15$ $\mathrm{Ge}{\mathrm{V}}^2$ at the $ep$ collider HERA operating at a centre-of-mass energy of $\sqrt{s}=300$ $\mathrm{GeV}$. 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.

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

References in corpus (2)

• A Measurement of the Proton Structure Function $F_2(x,Q^2)$
• The Gluon Density of the Proton at Low $x$ from a QCD Analysis of $F_2$

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