121417204
Cosmic ray neutrino detection on the ground level
Abstract The Cherenkov water detector with volume 2000 m 3 for registration of ν-induced muons from the bottom hemisphere on the ground level was constructed. First results of muon detection are described. Methods of atmospheric muon flux suppression and possibility to reach the rejection factor necessary for separation of ν-induced muons are discussed.
119359927
Measurements of integral muon intensity at large zenith angles
High-statistics data on near-horizontal muons collected with Russian-Italian coordinate detector DECOR are analyzed. Precise measurements of muon angular distributions in zenith angle interval from 60 to 90 degrees have been performed. In total, more than 20 million muons are selected. Dependences of the absolute integral muon intensity on zenith angle for several threshold energies ranging from 1.7 GeV to 7.2 GeV are derived. Results for this region of zenith angles and threshold energies have been obtained for the first time. The dependence of integral intensity on zenith angle and threshold energy is well fitted by a simple analytical formula.
189967436
A Proposed experiment to study extensive air shower cores at energies above 10**18-eV by hydroacoustic method
37815962
Observation of electromagnetic interactions of high energy muons deep underground.
121021089
Theory of the pair meter for high energy muon measurements
Abstract A systematic outline of the theory of the pair meter — a method of measuring the muon energy via multiple production of electron-positron pairs in thick layers of matter — is given. Possible variants of the technique of derivation of the muon energy in the pair meter are considered in unified terms on the basis of the maximum likelihood method. Analytical expressions for the energy measurement error have been obtained. An asymptotic limit of the measurement error at high energies has been found. The important role of the background process — the inelastic interaction of muons with nuclei — is elucidated. The problem of optimization of the pair meter for measuring the spectrum of cosmic ray muons is formulated and solved. The results of numerical simulation for the real pair meter are compared with the experimental data of the pair meter of the MUTRON arrangement. The pair meter technique can be used for the spectrometry of muons in the energy region ≳10 12 eV in new experimental arrangements.
126349784
Pair meter: A New muon spectrometer. (In Russian)
116603302
Structure Function Measurements at HERA
Recent structure function results from the H1 and ZEUS Collaborations are presented. The data cover a wide kinematic range of squared four-momentum transfers Q^2, from 0.2 GeV^2 to 30000 GeV^2, and Bjorken x between 5*10^-6 and 0.65. Data from both experiments have been combined, leading to significantly reduced experimental uncertainties. The combined measurements are analysed using a NLO QCD fit, and a set of parton density functions, HERAPDF1.0, is extracted. New direct measurements of the structure function F_L, making use of dedicated low energy runs of the HERA machine, are also presented.