Determination of the $e^+ e^- \to \gamma \gamma(\gamma)$ cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV
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W D. Apel
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M. Houlden
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M. Huber
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G J. Hughes
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R. Jacobsson
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R. Janik
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C. Jarlskog
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D. Jeans
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L. Jungermann
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K. Karafasoulis
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E C. Katsoufis
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R. Keranen
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G. Kernel
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Yu. Khokhlov
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A. Leisos
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G. Lenzen
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J. Libby
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W. Liebig
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D. Liko
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A. Lipniacka
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I. Lippi
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B. Lorstad
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J G. Loken
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D. Loukas
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P. Lutz
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L. Lyons
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J N. Macnaughton
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J R. Mahon
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A. Maio
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A. Malek
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S. Maltezos
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V. Malychev
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F. Mandl
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J. Marco
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R P. Marco
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B. Marechal
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M. Margoni
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J C. Marin
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C. Mariotti
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A. Markou
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C. Martinez-Rivero
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I Garcia S. Marti
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J. Masik
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N. Mastroyiannopoulos
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F. Matorras
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C. Matteuzzi
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G. Matthiae
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F. Mazzucato
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M. Mazzucato
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M. Mccubbin
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R. Mckay
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R. Mcnulty
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G. Mcpherson
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C. Meroni
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W T. Meyer
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A. Myagkov
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E. Migliore
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W A. Mitaroff
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U. Mjornmark
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T. Moa
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M. Moch
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R. Moller
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K. Monig
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M R. Monge
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D. Moraes
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P. Morettini
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G. Morton
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U. Muller
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K. Munich
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M. Mulders
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L M. Mundim
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R. Muresan
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W J. Murray
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B. Muryn
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G. Myatt
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T. Myklebust
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M. Nassiakou
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F L. Navarria
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K. Nawrocki
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P. Negri
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N. Neufeld
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R. Nicolaidou
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B S. Nielsen
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P. Niezurawski
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V. Nomokonov
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A. Nygren
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A. Oblakowska-Mucha
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V F. Obraztsov
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a G. Olshevskii
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A. Onofre
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R. Orava
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K. Osterberg
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A. Ouraou
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A. Oyanguren
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M. Paganoni
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S. Paiano
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R. Paiva
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L. Pape
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C. Parkes
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F. Parodi
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U. Parzefall
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A. Passeri
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O. Passon
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T. Pavel
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M. Pegoraro
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L. Peralta
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M. Pernicka
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A. Perrotta
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C. Petridou
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A. Petrolini
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H T. Phillips
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M. Pimenta
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T. Podobnik
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V. Poireau
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M E. Pol
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G. Polok
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P. Poropat
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V. Pozdnyakov
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P. Privitera
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N. Pukhaeva
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A. Pullia
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D. Radojicic
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S. Ragazzi
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J. Rames
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P. Rebecchi
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N G. Redaelli
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T. Rovelli
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M. Siebel
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F. Simonetto
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A. Sopczak
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R. Sosnowski
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Tz. Spassoff
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E. Spiriti
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S. Squarcia
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C. Stanescu
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M. Stanitzki
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K. Stevenson
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M. Szczekowski
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T. Tabarelli de Fatis
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A. Taffard
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N. Tinti
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L G. Tkatchev
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M. Tobin
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B. Tome
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A. Tonazzo
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L. Tortora
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Pablo Tortosa
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P. Tyapkin
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V. Uvarov
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G. Valenti
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E. Vallazza
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P. van Dam
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W. van den Boeck
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J. van Eldik
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A. van Lysebetten
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N. van Remortel
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I. van Vulpen
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G. Vegni
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Laurent Ventura
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W. Venus
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F. Verbeure
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M. Verlato
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L S. Vertogradov
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V. Verzi
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D. Vilanova
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L. Vitale
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E. Vlasov
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A. Vodopyanov
- Function : Author
G. Voulgaris
- Function : Author
V. Vrba
- Function : Author
H. Wahlen
- Function : Author
a J. Washbrook
- Function : Author
C. Weiser
- Function : Author
D. Wicke
- Function : Author
J H. Wickens
- Function : Author
G R. Wilkinson
- Function : Author
G. Wolf
- Function : Author
J. Yi
- Function : Author
O. Yushchenko
- Function : Author
A. Zalewska
- Function : Author
P. Zalewski
- Function : Author
D. Zavrtanik
- Function : Author
E. Zevgolatakos
- Function : Author
N I. Zimin
- Function : Author
A. Zintchenko
- Function : Author
G. Zumerle
- Function : Author
M. Zupan
- Function : Author
Abstract
A test of the QED process \eeintogg(\fot) is reported. The data analysed were collected with the DELPHI detector in 1998 and 1999 at the highest ener\-gies achieved at LEP, reaching 202 GeV in the centre-of-mass. The total integrated luminosity amounts to 375.7 pb$^{-1}$. The differential and total cross-sections for the process $e^+e^- \to \gamma \gamma$ were measured, and found to be in agreement with the QED prediction. 95\% Confidence Level (C.L.) lower limits on the QED cut-off parameters of $\rm \Lambda_+ $ 330 GeV and $\rm \Lambda_{-}>$ 320 GeV were derived. A 95\% C.L. lower bound on the mass of an excited electron of 311 $\rm GeV/c^2$ (for $\lambda_{\gamma}$ =1) was obtained. s-channel virtual graviton exchange was searched for, resulting in 95\% C.L. lower limits on the string mass scale, $\rm M_S$: $\rm M_S 713 \, GeV/c^2$ ( $\lambda=1$) and $\rm M_S 691 \,GeV/c^2$ ($\lambda = -1$).
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