Measurement of the proton structure function F2 at very low Q**2 at HERA.

The ZEUS collaboration
Phys.Lett.B 487 (2000) 53-73, 2000.

Abstract (data abstract)
DESY-HERA. Measurement of the proton structure function, F2, at very low X and Q**2. The range in Q**2 is from 0.045 to 0.65 GeV**2 and in X is from 6*10**-7 to 1*10**-3. The data come from collisions of 27.5 GeV positrons and 820 GeV protons with an integrated luminosity of 3.9 pb-1 taken during a six week running period in 1997 with dedicated triggers. This measurement uses the Beam Pipe Calorimeter (BPC) and Beam Pipe Tracker (BPT) to detect the scattered positrons. The BPT was installed in 1997 to compliment the BPC with precise tracking information.

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