FIZIKA B 4 (1995) 3, 273-286

STUDY OF H� ZZ � 4l^� WITH A FULL GEANT SIMULATION OF CMS DETECTOR

DEANA BOME�TAR^a, DANIEL DENEGRI^b, RITVA KINNUNEN^c and ALEXANDRE NIKITENKO^d
aInstitute Ru�er Bo�kovi�, Zagreb, Croatia
^bDAPNIA/ SPP,CEN Saclay, France
^cSEFT, University of Helsinki, Finland
^dITEP, Moscow, Russia

Dedicated to Professor Mladen Pai� on the occasion of his 90^th birthday

Received 11 July 1995

We study the detection of H � ZZ �4l^� in the CMS detector at the nominal LHC energy �s = 14 TeV and the possibility for an early detection at a reduced energy �s = 10 TeV. A systematic study of the multi-lepton mass resolution is performed, including effects of internal and external radiation through detailed GEANT simulations. At �s = 14 TeV, an integrated luminosity of 10⁴ pb^-1 allows exploration at a � 5s significance level a mass range from m_H � 2m_Z up to m_H � 400 GeV. For 10⁵ pb^-1, the mass reach is about 650 GeV. At �s = 10 TeV, an integrated luminosity of 10⁴ pb^{- 1} does not provide a 5s significance level for any value of Higgs mass, and 2�10⁴ pb^-1 alows one to explore a mass range from m_H � 2m_Z to � 350 GeV at � 5s level.

UDC 539.12
PACS 06.90.+v

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