QCD Analysis of Leading-Neutron Production at HERA: Determination of Neutron Fracture Functions

The last two decades have seen a growing trend towards the experimental efforts at the electron-proton collider HERA in which have collected high precision data on the spectrum of leading neutron (LN) and leading-proton (LP) carrying a large fraction of the proton’s energy. In our recent study [Phys. Rev. D 95 (2017), 074011], we have proposed an approach based on the Fractures Functions (FF) formalism and have extracted the neutron Fracture Functions (neutron FFs) from a global QCD analysis of LN production data measured by H1 and ZEUS collaborations at HERA. We have shown that considering the approach based on the framework of Fracture Functions, one could phenomenologically parametrize the neutron FFs at the input scale. In order to access the uncertainties for the obtained neutron FFs as well as the LN structure functions and cross section, associated with the uncertainties in the data, we have made an extensive use of the “Hessian method”. Our theory predictions based on the obtained neutron FFs are in satisfactory agreement with all LN data analyzed, for a wide range of [Formula: see text] and [Formula: see text].

Evaluation Of Externalities In The Long-Time Influenced Mining Area In Orlová - Poruba / Oceňování Externalit V Území Dlouhodobě Ovlivněném Dobýváním Uhlí V Lokalitě Orlová - Poruba

The article analyses the basic issues of procedural methods for evaluating the environment affected by the exploitation of mineral resources. The paper deals with the area, which was affected by black coal extraction already in the last century and is located in the area of Orlová-Poruba. Tthe first part explicates the basic concepts of landscape restoration issues, views of the methods of assessment and evaluation of the environment and related negative and positive externalities incurred. Another part of this paper assesses the affected area using the so-called Hessian method. Finally, we assess possible solutions of the evaluation of mostly positive externalities ocurred under the conditions in the Czech Republic and the desirability of the proposed new methodology for environmental assessment, including possible solutions.