54014486
Photoproduction—DIS Transition
Recent measurements of the proton structure function F2 at low Q2 in e+p deep inelastic scattering (DIS) by the H1 Collaboration are summarized. This measurements are performed in the region of low squared four‐momentum transfers, 0.2 GeV2⩽Q2⩽12 GeV2, and low Bjorken x, 5⋅10−6⩽x⩽0.02.
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.
124965491
Structure functions measurements at HERA
The measurements of the DIS cross sections at low Q (from 0.2GeV to 12GeV) [1] and medium Q (from 12GeV to 150GeV) [2] are based on data collected by the H1 Collaboration in 1999-2000. In order to access low values of Q around 1 GeV the interaction vertex, for short period of H1 2000 data taking, was shifted by approximately 70 cm along the proton beam direction. This data sample is also used for accessing larger values of x with Initial State Radiation (ISR) events. Data collected by the H1 Collaboration in 1999 with a nominal position of the interaction vertex are used for measurements in the region of high inelasticity y. These data are combined with H1 data taken in 1995-1997 following the prescription introduced in [3]. The H1 measurements at low and medium Q are shown in Figure 1. These are the most precise results of the H1 Collaboration in the given kinematic domain. The accuracy of the combined measurements is typically at the level of 1-2%. The H1 data alone is used in a NLO QCD analysis to determine a new set of parton densities called H1PDF2009.
118735964
Measurements of the proton structure at HERA and their impact for LHC
Recent results on proton structure functions from H1 and ZEUS Collaborations are presented. The data have been recorded in e + p and e − p collisions for both Neutral Current and Charged Current reactions, covering 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 in a NLO QCD fit, and a set of parton density functions, HERAPDF1.0, is extracted from these data alone. New direct measurements of the structure function F L , making use of dedicated low energy runs of the HERA machine, are also presented. The impact of the HERA data on the parton density functions and predictions for LHC is discussed.
118635483
Energy measurement with the SDHCAL prototype
The SDHCAL prototype that was completed in 2012 was exposed to beams of pions, electrons of different energies at the SPS of CERN for a total time period of 5 weeks. The data are being analyzed within the CALICE Collaboration. However preliminary results indicate that a highly granular hadronic calorimeter conceived for PFA application is also a powerful tool to separate pions from electrons. The SDHCAL provides also a very good resolution of hadronic showers energy measurement. A new calibration method that takes into account the degradation of the Glass Resistive Plate Chambers (GRPC) response for runs with rather high particle beam rate is presented.
31393010
Measurement of the Inclusive ep Scattering Cross Section at HERA
Measurements of the inclusive ep scattering cross section are presented in the wide region of four-momentum transfers squared, 0.2 GeV 2 ⩽ Q 2 ⩽ 30000 GeV 2 , and Bjorken x , 4 ⋅ 10 −6 ≲ x ≲ 0.8 . The results are based on data sets collected by the H1 and ZEUS collaborations at HERA. The data include the region of high inelasticity y up to 0.9, which is sensitive to the longitudinal proton structure function F L ( x , Q 2 ) .
116910357
Generation Processes of Cosmic Ray Muons
123420673
Proton structure functions over the entire kinematical region
A new approach to describing inelastic charged-lepton scattering on a proton is proposed. The approach is based on combining the results obtained by theoretically studying the limiting cases of this process. The proton structure function is obtained in an analytic form that involves virtually no free parameters and which is in good agreement with experimental data over the entire kinematical region.
117393906
Analytic Description of Proton Structure Functions in the Whole Kinematic Region
122399490
Multiple interactions of muons in the NUSEX detector and muon energy spectrum deep underground
Abstract Multiple electromagnetic interactions of high energy cosmic ray muons in the NUSEX detector (5000 mwe underground) have been analysed. Different modes of the pair meter technique have been used to investigate the muon energy spectrum shape at the observation depth. The observed event distributions are in good agreemetn with the expectation based on the usual picture of underground muon spectra. The first experimental estimates of the muon spectrum parameters at great depths have been obtained. A comparison of the estimated average muon energy with the available theoretical calculations is given.
116206665
A Coordinate Detector for Studying Horizontal Fluxes of Cosmic Rays
A DECOR coordinate detector is a multilayer system of plastic streamer tube chambers located around a NEVOD Cerenkov water calorimeter. The basic characteristics of the detector are as follows: the area is ∼100 m2, the angular resolution is ∼1°, and the space resolution is ∼1 cm. The structure of the detector, data acquisition and trigger systems, and results obtained during the operation of a pilot assembly (8 chamber layers and a working area of 8.4 m2) are given.