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Event weights for simulating Bose-Einstein correlations.

Research output: Contribution to journalJournal article

Published

Journal publication date9/08/2001
JournalPhysics Letters B
Journal number1-2
Volume514
Number of pages12
Pages7-18
Original languageEnglish

Abstract

An event weighting method for simulating Bose–Einstein effects in hadronic final states is presented. The weight for an event depends on the momentum distribution of identical bosons in the event. By using a theoretically motivated parametrisation allowing weights below as well as above unity, the necessity of a weight-rescaling procedure is eliminated. A single parameter is used to adjust the average event weight to unity. Once adjusted, the same value of the parameter gives average event weights that are essentially independent of energy, initial quark flavour, multiplicity and jet topology. The influence of Bose–Einstein correlations on various measurable quantities in W pair production is found to be small. In particular, none of the scenarios considered resulted in a W mass shift larger than 13 MeV.

Bibliographic note

A new, stable method for calculating the effect of Bose-Einstein correlations on quantities like the like W mass is introduced. The method and software was used in studies by OPAL & DELPHI and helped reduce the systematic uncertainty on the W mass measurement at LEP. RAE_import_type : Journal article RAE_uoa_type : Physics