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Abstract: HERA $ep$ collider provides unique information on the proton structure. Highcenter of mass energy $s=320$ GeV gives access to both the low Bjorken-$x$domain and regime of high momentum transfers $Q$. Recently the H1 collaborationreported a high precision measurement of the structure function $F 2$ at low$x$ leading to tight constraints on the sea quark and gluon densities. Both theH1 and ZEUS collaborations measure the structure function $F L$ which providesan important cross check of the conventional QCD picture. This measurement isrecently extended by H1 to low $Q^2$ where small $x$ corrections may playimportant role. An ultimate precision of the deep inelastic scattering crosssection measurement is achieved by combining the measurements of the H1 andZEUS collaborations. The combined data are used as a sole input to a QCD fit toobtained HERA PDF set. New measurements of inclusive $e^-p$ neutral and chargedcurrent scattering cross sections by the ZEUS collaboration at high $Q^2$improve precision in this kinematic domain. H1 analysis of the DIS high $P t$jet production cross section is used for a determination of the strong couplingconstant $\alpha S$. Separation of the strange quark density from the total seais obtained by the HERMES collaboration using tagged $K^{\pm}$ production.

Autor: A. Glazov


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