Measurement of the proton structure function F2 (x, Q2) in the low-x region at HERA

Abstract A measurement of the proton structure functionF 2 ( x , Q 2 ) is presented with about 1000 neutral current deep inelastic scatteringevents for Bjorken x in the range x ⋍ 10 −2 – 10 −4 and Q 2 > 5 GeV 2 . The measurement is based on an integrated luminosity of 22.5 nb −1 recorded by the H1 detector in the first year of HERAoperation. The structure functionF 2 ( x , Q 2 ) shows a significant rise with decreasing x .