Title
Search for high mass<tex>$\gamma\gamma$</tex> resonances in <tex>$e^{+}e^{-}\rightarrow\ell^{+}\ell^{-}\gamma\gamma$</tex>, <tex>$\nu\overline{\nu}\gamma\gamma$</tex> and <tex>$q\overline{q}\gamma\gamma$</tex> at LEP I Search for high mass<tex>$\gamma\gamma$</tex> resonances in <tex>$e^{+}e^{-}\rightarrow\ell^{+}\ell^{-}\gamma\gamma$</tex>, <tex>$\nu\overline{\nu}\gamma\gamma$</tex> and <tex>$q\overline{q}\gamma\gamma$</tex> at LEP I
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Berlin ,
Subject
Physics
Source (journal)
Zeitschrift für Physik : C : particles and fields. - Berlin
Volume/pages
72(1996) :2 , p. 179-190
ISSN
0170-9739
ISI
A1996VP22100002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
A search for high mass photon pairs from the processes e(+)e(-) --> l(+)l(-)gamma gamma, e(+)e(-) --> <q(q)over bar gamma gamma> and e(+)e(-) --> nu nu gamma gamma with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z(0) decays, collected by DELPHI during the years 1991 to 1994, 79 events with two charged leptons and two isolated photons were selected with photon pair masses above 10 GeV/c(2), where 76 +/- 6 events were predicted from standard sources. In the same data sample, no <nu(nu)over bar gamma gamma> candidates were found and no accumulation of events was visible for gamma gamma masses above 10 GeVlc2 in the q<q(q)over bar gamma gamma> channel. Upper limits at 95% confidence level on the Z(0) branching ratios for the three different channels were extracted from the data. In the mass region m(gamma gamma) > 30 CeV/c(2) the limits obtained are between 3x10(-6) and 4x10(-6).
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