Public web page of the
LEP2 diphoton group

Notes / Papers

LEP:	LEP2FF/02-02
ALEPH:	183	189 - 209
DELPHI:	183	189 - 202	206
L3:	183 - 189	192 - 209
OPAL:	183 - 209

Total cross-section

Experiment	sigma/QED
ALEPH	0.953+-0.024
DELPHI	0.976+-0.032
L3	0.978+-0.018
OPAL	0.999+-0.016
LEP	0.982+-0.010

Limits from the differential cross-section

cut-off parameter	Lambda+	>	392 GeV
	Lambda-	>	364 GeV
contact interaction	Lambda'	>	831 GeV
Low scale gravity	lambda=+1: MS	>	933 GeV
	lambda=-1: MS	>	1010 GeV
Excited electrons	f/Lambda	<	3.9 TeV-1 (Me*=200 GeV)
	Me*	>	248 GeV, (f=1 Lambda=Me*)

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