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19 April 2024

» arxiv » hep-ex/9809008

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The Estimation of the Effective Centre of Mass Energy in q-qbar-gamma Events from DELPHI
P. Abreu ; A. De Angelis ; G. Della Ricca ; D. Fassouliotis ; A. Grefrath ; N. Kjaer ; R. Henriques ; M. Mulders ; M. Pimenta ; L. Vitale ;
Date:	11 Sep 1998
Journal:	Nucl.Instrum.Meth. A427 (1999) 487-494
Subject:	hep-ex
Abstract:	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.
Source:	arXiv, hep-ex/9809008
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