Research Collection
Doctoral Thesis
Comparison of the experimental cross-sections of high-mass muon pairs produced by negative pions on deuterium and tungsten
Author(s): Guanziroli, Mario
Publication Date: 1986
Permanent Link: https://doi.org/10.3929/ethz-a-000412385
Rights / License: In Copyright - Non-Commercial Use Permitted
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ETH Library ETH Diss. Nr. 7989
COMPARISON OF THE
EXPERIMENTAL CROSS-SECTIONS
OF HIGH-MASS MUON PAIRS
PRODUCED BY NEGATIVE PIONS
ON DEUTERIUM AND TUNGSTEN
A dissertation submitted to the
SWISS FEDERAL INSTITUTE OF TECHNOLOGY ZURICH
for the degree of
Doctor of Natural Sciences
Presented by
Mario GUANZIROLI
graduate in physics of the ETH-Zurich
born October 30,1952
citizen of Italy
Accepted on the recommandation of
Prof. V.L. Telegdi, Examiner
Prof. H.Hofer, Co-Examiner
1986 ABSTRACT
The cross-sections for massive lepton pair production by 284 GeV/c negative pions simultaneously on
D2 and W, as measured with the NA10 spectrometer at the CERN SPS, are compared. Nuclear effects in the results are searched forjit is shown that, in the ratio tungsten/deuterium cross-section.there is evidence for a Xp-dependence: in the interval 0.30 < y/r < 0.36, this ratio has a slope of
1.30±0.47(stat.). The A-dependence of the total cross-section a(Z,A) = a0(Z/A)*Aa was determined with the best accuracy to date.yielding
«' = 1.000+0.006(stat.)± 0.002(syst.). RIASSUNTO
Si confrontano le sezioni efficaci di produzione di coppie di leptoni di massa elevata da parte di pioni negativi di 284 GeV/c simultaneamente su D2 e W, misurate con lo spettrometro NAIO all'SPS al
CERN. Si cercano effetti nucleari nei risultati;si mostra che,nel rapporto delle sezioni efficaci tungsten- o/deuterio c'e evidenza di una dipendenza rispetto ad Xp: nell'intervallo 0.30 < ,/t < 0.36, tale rapporto ha una pendenza pari a 1.30±0.47(stat.). La dipendenza lineare rispetto ad A della sezione efficacie to- tale a(Z,A) = a0(Z/A)'Aa e stata verificata con la massima precisione finora raggiunta, ottenendo a'=1.000+0.006(stat.)±0.002(sist.).