Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS

The longitudinal polarisation transfer from muons to lambda and anti-lambda hyperons, D_LL, has been studied in deep inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to lambda and anti-lambda produced in the current fragmentation region exhibit different behaviours as a function of x and xF . The measured x and xF dependences of D^lambda_LL are compatible with zero, while D^anti-lambda_LL tends to increase with xF, reaching values of 0.4 - 0.5. The resulting average values are D^lambda_LL = -0.012 +- 0.047 +- 0.024 and D^anti-lambda_LL = 0.249 +- 0.056 +- 0.049. These results are discussed in the frame of recent model calculations.Comment: 13 pages, 7 figure

Physics with charm particles produced in neutrino interactions. A historical recollection

Results obtained in neutrino unteractions on charm particles are presented

Coherent Production of Single Pions and rho Mesons in Charged Current Interactions of Neutrinos and Antineutrinos on Neon Nuclei at the Fermilab Tevatron

The coherent production of and mesons in ()-neon charged-current interactions has been studied using the Fermilab 15-foot bubble chamber filled with a heavy Ne-H2 mix and exposed to the Tevatron quadrupole triplet (anti)neutrino beam. The () beam had an average energy of 80 GeV (70 GeV). From a sample corresponding to approximately 28 000 charged-current interactions, net signals of (539) coherent events and (197) 0 coherent events are extracted. For E>10 GeV, the coherent pion production cross section is determined to be (3.20.7)×10-38 cm2 per neon nucleus whereas the coherent production cross section is (2.10.8)×10-38 cm2 per neon nucleus. These cross sections and the kinematical characteristics of the coherent events at0(64 auteurs)SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Performance measurement: a historical perspective

Performance measurement is a topic of current interest at both national and local level. This article is a selective historical review of performance measurement from the 1960s to the present day. Despite the plethora of literature on the topic there appears to be a notable lack of progress. Some of the major and most recent work is assessed and the fundamental difficulties in attempting to measure the performance of library services are noted. It is suggested that future work must concentrate on output measures which are both appropriate to the service being provided and easy to understand by all