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Search for 14.4 keV solar axions emitted in the M1-transition of 57Fe nuclei with CAST
CAST Collaboration, S. Andriamonje, S. Aune +58
We have searched for 14.4 keV solar axions or more general axion-like particles (ALPs), that may be emitted in the M1 nuclear transition of 57Fe, by using the axion-to-photon conve…
Search for solar axion emission from 7Li and D(p,gamma)3He nuclear decays with the CAST gamma-ray calorimeter
CAST Collaboration, S. Andriamonje, S. Aune +58
We present the results of a search for a high-energy axion emission signal from 7Li (0.478 MeV) and D(p,gamma)3He (5.5 MeV) nuclear transitions using a low-background gamma-ray cal…
Solar axion search with the CAST experiment
CAST Collaboration, E. Arik, S. Aune +74
The CAST (CERN Axion Solar Telescope) experiment is searching for solar axions by their conversion into photons inside the magnet pipe of an LHC dipole. The analysis of the data re…
Probing eV-scale axions with CAST
CAST Collaboration, E. Arik, S. Aune +70
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously have report…
Search for low Energy solar Axions with CAST
Giovanni Cantatore, E. Arik, S. Aune +77
We have started the development of a detector system, sensitive to single photons in the eV energy range, to be suitably coupled to one of the CAST magnet ports. This system should…
Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS
The COMPASS Collaboration, M. Alekseev, V. Yu. Alexakhin +238
The measurements of the Collins and Sivers asymmetries of identified hadrons produced in deep-inelastic scattering of 160 GeV/c muons on a transversely polarised 6LiD target at COM…
Transverse Polarization of Lambda and Lambda-bar Hyperons in Quasireal Photoproduction
The HERMES Collaboration, A. Airapetian
The HERMES experiment has measured the transverse polarization of Lambda and Lambda-bar hyperons produced inclusively in quasireal photoproduction at a positron beam energy of 27.6…
Double spin asymmetry in exclusive rho^0 muoproduction at COMPASS
COMPASS Collaboration, M. Alekseev
The longitudinal double spin asymmetry A_1^rho for exclusive leptoproduction of rho^0 mesons, mu + N -> mu + N + rho, is studied using the COMPASS 2002 and 2003 data. The measured…
Spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron at low values of x and Q^2
The Compass Collaboration, E. S. Ageev
We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.…
A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
Compass, :, E. S. Ageev
New high precision measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarised 6LiD target are…
Search for solar axions: the CAST experiment at CERN
Berta Beltran
Hypothetical axion-like particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field they would be transformed into…
First results from the CERN Axion Solar Telescope (CAST)
CAST Collaboration
Hypothetical axion-like particles with a two-photon interaction would be produced in the Sun by the Primakoff process. In a laboratory magnetic field (``axion helioscope'') they wo…
Quark helicity distributions in the nucleon for up, down, and strange quarks from semi--inclusive deep--inelastic scattering
HERMES Collaboration, A. Airapetian
Polarized deep--inelastic scattering data on longitudinally polarized hydrogen and deuterium targets have been used to determine double spin asymmetries of cross sections. Inclusiv…
Flavor decomposition of the sea quark helicity distributions in the nucleon from semi-inclusive deep-inelastic scattering
HERMES collaboration, A. Airapetian
Double-spin asymmetries of semi-inclusive cross sections for the production of identified pions and kaons have been measured in deep-inelastic scattering of polarized positrons on…
Measurement of single-spin azimuthal asymmetries in semi-inclusive electroproduction of pions and kaons on a longitudinally polarised deuterium target
HERMES collaboration, A. Airapetian
Single-spin asymmetries have been measured for semi-inclusive electroproduction of , , and mesons in deep-inelastic scattering off a longitudinally polarised…
Evidence for Quark-Hadron Duality in the Proton Spin Asymmetry
HERMES Collaboration, A. Airapetian
Spin-dependent lepton-nucleon scattering data have been used to investigate the validity of the concept of quark-hadron duality for the spin asymmetry . Longitudinally polaris…
Measurement of the cross section at beam momenta in the regions of 1.45 and 1.7 GeV/c
P. D. Barnes, B. Bunker, H. Dennert +26
The PS185 experiment at LEAR/CERN has investigated strangeness production in antiproton-proton collisions with final states such as , , $\overlin…
Single-spin Azimuthal Asymmetries in Electroproduction of Neutral Pions in Semi-inclusive Deep-inelastic Scattering
HERMES Collaboration, A. Airapetian
A single-spin asymmetry in the azimuthal distribution of neutral pions relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of…
Double-Spin Asymmetry in the Cross Section for Exclusive rho^0 Production in Lepton-Proton Scattering
HERMES Collaboration, A. Airapetian
Evidence for a positive longitudinal double-spin asymmetry <A_1^rho> = 0.24 +-0.11 (stat) +-0.02 (syst) in the cross section for exclusive diffractive rho^0(770) vector meson produ…
Implementation of the Dead-Time Free F1 TDC in the COMPASS Detector Readout
H. Fischer, J. Franz, A. Grunemaier +7
In the scope of the COMPASS experiment a multi-purpose, high rate capable TDC with digitisation width of 60 ps has been developed. The integration into the readout system and the f…
Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion Electro-Production
A. Airapetian
Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distributi…
Flavor Decomposition of the Polarized Quark Distributions in the Nucleon from Inclusive and Semi-inclusive Deep-inelastic Scattering
K. Ackerstaff, The HERMES Collaboration
Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized posit…
TDC Chip and Readout Driver Developments for COMPASS and LHC-Experiments
G. Braun, H. Fischer, J. Franz +7
A new TDC-chip is under development for the COMPASS experiment at CERN. The ASIC, which exploits the 0.6 micrometer CMOS sea-of-gate technology, will allow high resolution time mea…
Measurement of the Proton Spin Structure Function g1p with a Pure Hydrogen Target
A. Airapetian
A measurement of the proton spin structure function g1p(x,Q^2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron be…