[en] The first measurement of direct CP violation parameter Re(ε^'/ε) from the KTeV experiment is presented in this paper. Using a subset of data collected in 1996 and in 1997 we find that Re(ε^'/ε)=[28.0±3.0(stat)±2.8(syst)]x10^-4

[en] An experimental procedure is proposed to perform measurements of differential cross sections which can be compared to fixed-order QCD predictions with improved accuracy. The procedure can be applied to the Drell-Yan cross-section measurements which are differential in the boson transverse momentum. An example analysis is performed using the ATLAS measurement of the Z-boson production cross section at center-of-mass energy of 8 TeV. The resulting full phase space measurement of the cross section differential in the boson rapidity is compared to theoretical predictions computed with next-to-next-to leading-order accuracy in QCD.

[en] The first measurement of direct CP violation parameter Re(ε'/ε) from the KTeV experiment at Fermilab is presented in this paper. Using a subset of data collected in 1996 and in 1997 we find that Re(ε'/ε) = [2.80 ± 3.0(stat) ± 2.8(syst)] x 10^-4 [1]

[en] An experimental procedure is proposed to perform measurements of differential cross sections for vector boson production which can be compared to fixed-order QCD predictions with improved accuracy. The procedure relies on applying theoretical acceptance corrections computed as a function of the transverse momentum of the W/Z boson, p${}_T$, to the experimental measurement, rather than comparing data directly against fiducial fixed-order predictions. It is demonstrated that, contrary to standard fiducial computations, these acceptance factors vary little at low p${}_T$, so they can be reliably computed using fixed-order perturbation theory. An example analysis is performed using the ATLAS measurement of the Z-boson production cross section at center-of-mass energy of 8 TeV. The resulting full phase space measurement of the cross section differential in the boson rapidity is compared to theoretical predictions computed with next-to-next-to leading-order accuracy in QCD. Further extensions of the approach which include different types of measurements and improved theoretical predictions are discussed.

[en] The modification of the deformable template method (DTM) application to the problem of track finding and track parameter determination for data detected with high pressure drift tubes (HPDT) in the design of ATLAS for the muon spectrometer experiment is proposed. Our DTM applications consist of two parts, according to two stages of the study. The first part relates to the stage of HPDT study on the CERN muon beam (BEAM-TEST) with the simplest one-prong events without noise signals, where the main obstacle is the left-right ambiguities for each tube. In the second part more complicated HPDT data are to be handled with noise signals. It was shown that the suggested DTM development solves the problem of track recognition and track parameter determination for both noiseless and noise data. Results are obtained on the real beam test data and on data simulating the muon spectrometer on the basis of HPDT. 14 refs., 10 figs

[en] A method to combine measurements of the structure functions performed by several experiments in a common kinematic domain is presented. This method generalises the standard averaging procedure by taking into account point-to-point correlations which are introduced by the systematic uncertainties of the measurements. The method is applied to the neutral and charged current deep inelastic scattering cross section data published by the H1 and ZEUS collaborations. The averaging improves accuracy owing to the cross calibration of the H1 and ZEUS measurements

[en] A new measurement is presented of elastic deeply virtual Compton scattering based on data taken by the H1 detector at HERA. For the first time the cross section dependence is reported on the momentum transfer squared at the proton vertex, t. The data is well described by the QCD based calculations

[en] Recent measurements of the inclusive Deep Inelastic Scattering (DIS) cross section performed by the H1 and ZEUS Collaborations at the HERA collider are presented. The measurements span a wide range in the absolute four momentum transfer squared, 0.2 GeV² < Q² < 30000 GeV², from the photoproduction to electroweak domain. A broad coverage in the Bjorken-x variable, 10^-5 < x < 0.6, allows to study QCD for different regimes and also to determine the parton distribution functions for the LHC. An extension of the measurement to high inelasticity, y > 0.6, gives an access to the proton longitudinal structure function F_L. A dedicated run with a reduced proton beam energy taken at the end of the HERA operation will allow to measure F_L for the first time at HERA. (author)

[en] The first measurement of direct CP violation parameter $\text{Re(}\text{ϵ′}\text{ϵ}\text{)}$ from the KTeV experiment at Fermilab is presented in this paper. Using a subset of data collected in 1996 and in 1997 we find that $\text{Re(}\text{ϵ′}\text{ϵ}\text{) = [28.0 ± 3.0(stat) ± 2.8(syst)] × 10}{}^{\mathrm{-4}}$ [1].

[en] The study of the functioning of detectors like a multiwire proportional chamber has led to the necessity of taking into account its discrete structure and of prefiltering data before processing. The filtering method for tracks in this discrete detector based on the cellular automaton is described. Results of the application of this method to experimental data (the spectrometer ARES) are quite successful: A high degree of cleaning from noise and the restoring of missing clusters give three-fold reduction of raw data with the partial track recognition. The percentage of good events is increased and their further processing is considerably simplified and accelerated. The described cellular automaton for track filtering is suitable for parallel computing and could be also used in the on-line mode. (orig.)