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

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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.).