Elsevier

Physics Letters B

Volume 407, Issues 3–4, 4 September 1997, Pages 432-448
Physics Letters B

Measurement of the proton structure function F2 and σtotγp at low Q2 and very low x at HERA

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Abstract

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q2 inelastic neutral current scattering, e+pe+X, at HERA. A measurement of the proton structure function F2 and the total virtual photon-proton (γp) cross-section is presented for 0.11 ≤ Q2 ≤ 0.65 GeV2 and 2 × 10−6x ≤ 6 × 10−5, corresponding to a range in the γp c.m. energy of 100 ≤ W ≤ 230 GeV. Comparisons with various models are also presented.

Cited by (0)

56

Supported by the US Department of Energy.

46

Supported by the Italian National Institute for Nuclear Physics (INFN).

1

Also at IROE Florence, Italy.

2

Now at Univ. of Salerno and INFN Napoli, Italy.

3

Now at Univ. of Crete, Greece.

4

Supported by Worldlab, Lausanne, Switzerland.