Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1998-09-11
Nucl.Instrum.Meth. A427 (1999) 487-494
Physics
High Energy Physics
High Energy Physics - Experiment
12 pages, 6 figures
Scientific paper
10.1016/S0168-9002(98)01394-1
The photon radiation in the initial state lowers the energy available for the e$^+$e$^-$ collisions; this effect is particularly important at LEP2 energies (above the mass of the Z boson). Being aligned to the beam direction, such initial state radiation is mostly undetected. This article describes the procedure used by the DELPHI experiment at LEP to estimate the effective centre-of-mass energy in hadronic events collected at energies above the Z peak. Typical resolutions ranging from 2 to 3 GeV on the effective center-of-mass energy are achieved, depending on the event topology.
Abreu P.
Angelis Alessando de
Della Ricca G.
Fassouliotis D.
Grefrath A.
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