117780445
Report of the Fixed-Target Proton-Accelerator Group
The fixed target proton accelerator group divided itself into two roughly equal parts. One sub-group concentrated on a high intensity (10/sup 14/ protons/sec) moderate energy (30 GeV) machine while the other worked on a moderate intensity (5 x 10/sup 11/ protons/sec) very high energy (20 TeV) machine. For experiments where the total available energy is adequate, the fixed target option added to a anti p p 20 TeV collider ring has several attractive features: (1) high luminosity afforded by intense beams striking thick solid targets; (2) secondary beams of hadrons, photons, and leptons; and (3) the versatility of a fixed target facility, where many experiments can be performed independently. The proposed experiments considered by the subgroup, including neutrino, photon, hadron, and very short lived particle beams were based both on scaled up versions of similar experiments proposed for Tevatron II at Fermilab and on the 400 GeV fixed target programs at Fermilab and CERN.
117780445
Report of the Fixed-Target Proton-Accelerator Group
The fixed target proton accelerator group divided itself into two roughly equal parts. One sub-group concentrated on a high intensity (10/sup 14/ protons/sec) moderate energy (30 GeV) machine while the other worked on a moderate intensity (5 x 10/sup 11/ protons/sec) very high energy (20 TeV) machine. For experiments where the total available energy is adequate, the fixed target option added to a anti p p 20 TeV collider ring has several attractive features: (1) high luminosity afforded by intense beams striking thick solid targets; (2) secondary beams of hadrons, photons, and leptons; and (3) the versatility of a fixed target facility, where many experiments can be performed independently. The proposed experiments considered by the subgroup, including neutrino, photon, hadron, and very short lived particle beams were based both on scaled up versions of similar experiments proposed for Tevatron II at Fermilab and on the 400 GeV fixed target programs at Fermilab and CERN.
125981400
A Study of Photons from Decays of the K0(L)
19261126
Experimental study of muon pairs produced by 252-GeV pions on tungsten.
We present the results of a study of muon pairs with invariant masses greater than 4.05 GeV/c/sup 2/ produced in high-energy pion-nucleon interactions. The production cross section together with the inferred pion and nucleon structure functions are reported and compared with other experiments and with QCD predictions. The transverse-momentum distributions are also presented. Finally, the full angular distribution in costheta and phi is given as a function of mass, Feynman x, and transverse momentum. Longitudinal photon polarization is seen in the lower portion of the mass range at high x/sub ..pi../. This result is compared with a higher-twist model.
20396173
Measurement of the ratio of sea to valence quarks in the nucleon.
The ratio of sea to valence quarks for nucleons in tungsten has been measured for the fractional momentum range 0.04{lt}{ital x}{sub {ital N}}{lt}0.36. The determination is based on the relative production rate of muon pairs by {pi}{sup +} and {pi}{sup {minus}} beams on a tungsten target. The results provide the most accurate determination to date of this ratio in the region {ital x}{sub {ital N}}{lt}0.1 and {ital Q}{sup 2}{gt}20 GeV{sup 2}, and are in good agreement with earlier measurements.
41404357
Longitudinal photon polarization in muon pair production at high xF.
Muon pair production by pions has been studied in an apparatus optimized for detection at large x-italic/sub F-italic/. Results, based on a small fraction of the data, are reported here for the virtual-photon polarization and the pion structure function. These results confirm our previous work and are consistent with a QCD model involving higher-twist effects at large x-italic/sub F-italic/.
123394100
Energy resolution of the barrel of the CMS Electromagnetic Calorimeter
The energy resolution of the barrel part of the CMS Electromagnetic Calorimeter has been studied using electrons of 20 to 250 GeV in a test beam. The incident electron's energy was reconstructed by summing the energy measured in arrays of 3x3 or 5x5 channels. There was no significant amount of correlated noise observed within these arrays. For electrons incident at the centre of the studied 3x3 arrays of crystals, the mean stochastic term was measured to be 2.8% and the mean constant term to be 0.3%. The amount of the incident electron's energy which is contained within the array depends on its position of incidence. The variation of the containment with position is corrected for using the distribution of the measured energy within the array. For uniform illumination of a crystal with 120 GeV electrons a resolution of 0.5% was achieved. The energy resolution meets the design goal for the detector.