121557682
A set of multigap plane proportional chambers with optimised sensitive surface area for a vertex detector
The construction and performance of multigap plane multiwire proportional chambers (MWPCS) 108*108 cm2 are described. Relevant details on the construction procedure and the results of operating tests are reported. These chambers are operating in the NAl experiment at SPS, CERN.
108482839
Limited Streamer Chamber Testing and Quality Evaluation in Astra
120165306
A measurement of the pion charge radius
Abstract We report a measurement of the negative pion electromagnetic form factor in the range of space-like four-momentum transfer 0.014 q 2 c ) 2 . The measurement was made by the NA7 collaboration at the CERN SPS, by observing the interaction of 300 GeV pions with the electrons of a liquid hydrogen target. The form factor is fitted by a pole form with a pion radius of 〈r 2 〈 1 2 = 0.657 ± 0.012 fm.
117618272
alphaalpha elastic scattering at 4.32 GeV/c and 5.07 GeV/c
Abstract αα elastic scattering was measured at 4.32 GeV/ c and 5.07 GeV/ c incident momenta. The four-momentum transfer range, extending from −0.05 to −0.77 (GeV/ c ) 2 , covers the first and second minimum regions. The results are compared with calculations based on Glauber theory.
717821
An Uncoventional Approach for a Straw Tube-Microstrip Detector
We report on a novel concept of silicon microstrips and straw tubes detector, where integration is accomplished by a straw module with straws not subjected to mechanical tension in a Rohacell lattice and carbon fiber reinforced plastic shell. Results on mechanical and test beam performances are reported on as well.
120344543
Very backward π0 and η0 production by proton projectiles on a deuterium target at intermediate energies
Abstract The production of π 0 and η 0 mesons in the reactions pd → π 0 τ and pd → η 0 τ has been studied at very backward angles for kinetic proton energies T p ranging from 0.92 to 2.6 GeV. The excitation functions at θ π = θ η = 180° display large structures which might be related to baryonic (Δ and N ∗ ) excitations in the intermediate state.
14257235
Multiplicity difference between heavy- and light-quark jets revisited
Abstract.The perturbative QCD approach to multiparticle production predicts a characteristic suppression of particle multiplicity in a heavy-quark jet as compared to a light-quark jet. In the modified leading logarithmic approximation (MLLA) the multiplicity difference $\delta_{Q\ell}$ between heavy- and light-quark jets is derived in terms of a few other experimentally measured quantities. The earlier prediction for b-quarks needs revision in the light of new experimental results and the improvement in the understanding of the experimental data. We now find $\delta_{b\ell} = 4.4\pm0.4$. The updated MLLA results on $\delta_{b\ell}$ and $\delta_{c\ell}$ are compared with the present data from e + e- annihilation. Their expected energy independence is confirmed within the energy range between 29 and 200 GeV; the absolute values are now in better agreement with experiment than in the previous analysis, and the remaining difference can be attributed largely to next-to-MLLA contributions, an important subset of which are identified and evaluated.
120768704
Maximum charged particle densities in small intervals of rapidity at ISR energies
120931449
MULTIPLICITY DIFFERENCE BETWEEN HEAVY AND LIGHT QUARK JETS