Mereni strukturni funkce protonu F_2(x, Q2) pomoci aparatury H1 na urychlovaci HERA v DESY.

A measurement of the proton structure function F_2(x, Q2) in the deep inelastic positron-proton scattering at HERA is presented for squared four momentum transfers 2.0?Q2?150 GeV2 and Bjorken-x values 5.10-5?x?0.2. The kinematic range is further defined with inelasticity values between 0.004 and 0.7. The chosen kinematic range corresponds to a scattering of positrons towards the backward part of the H1 apparatus which is in particular covered with the SpaCal calorimeter and the drift chamber BDC. The structure function F_2 is found to increase significantly with decreasing x, even in the lowest accessible Q2 region. This rise is found to be less steep for the lower Q2 value measured. The observed Q2 behaviour is consistent with the expected scaling violations, i.e. a weak (logarithmic) rise of F_2 with increasing Q2 for x<0.1. The data are well described in the full x and Q2 range by the NLOQCD fit. This fit is based on the conventional DGLAP evolution equations.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi