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Photon production at c.m. energies of 200 and 900 GeV
Authors
Richard R.E. Ansorge
L. Burow
+24 more
Per Carlson
R. S. De Wolf
B. Eckart
G. Ekspong
Christer Fuglesang
Jan Gaudaen
C. Geich-Gimbel
Burkhard Holl
Kerstin Jon-and
F. Lotse
Nikolaos Manthos
David Munday
Wolfgang Pelzer
J.G. Rushbrooke
Frixos Triantis
Luc Van hamme
Ch Walck
Chadwick C.P. Ward
David Ward
C. J S Webber
Toby White
Gaston Wilquet
N. Yamdagni
Barbro Åsman
Publication date
1 March 1989
Publisher
'Springer Science and Business Media LLC'
Doi
Cite
Abstract
We present data on photon production in non single-diffractive p {Mathematical expression}-collisions at c.m. energies of 200 and 900 GeV. Besides the general properties of photon production, i.e. pseudorapidity distribution and average multiplicity, we also investigate photon-charged two-particle pseudorapidity and multiplicity correlations. We find for the average number of photons in non single-diffractive p {Mathematical expression}-collisions 22.2±1.4±2.0 at 200 GeV and 41.4±2.1±3.5 at 900 GeV, where the first error is statistical and the second systematic. The analysis of photon-charged particle multiplicity correlations reveals strong positive correlations between the average number of photons and the number of simultaneously produced charged particles, as expected from FNAL and ISR studies and from our result at 546 GeV. We obtain for the correlation slope 0.95±0.08±0.11 at 200 GeV and 1.09±0.09±0.13 at 900 GeV (first error is statistical and the second systematic). The investigation of photon-charged two-particle pseudorapidity correlations shows that these correlations are of short range and compatible with the observed charged two-particle pseudorapidity correlations. These correlations and the results for the average number of photons as a function of the produced number of charged particles favour the conclusion that photon sources other than π0 s contribute significantly to the observed photon yield in non single-diffractive p {Mathematical expression}-collisions. For example, if all photons are assumed to come from π0 s and η mesons, a η/π0 ratio of about 20% is inferred. © 1989 Springer-Verlag.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
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Last time updated on 23/02/2017