Modelling Bose-Einstein correlations at LEP 2
Leif Lönnblad1 - Torbjörn Sjöstrand2
1 NORDITA,
Blegdamsvej 17,
DK-2100 København Ø, Denmark
(e-mail: leif@nordita.dk)
2 Department of Theoretical Physics,
Sölvegatan 14A,
S-223 62 Lund, Sweden
(e-mail: torbjorn@thep.lu.se)
Received: 25 November 1997
Abstract
We present new algorithms for simulating Bose-Einstein
correlations among final-state bosons in an event generator. The
algorithms are all based on introducing Bose-Einstein correlations
as a shift of final-state momenta among identical bosons, and differ
only in the way energy and momentum conservation is ensured. The
benefits and shortcomings of this approach, that may be viewed as
a local reweighting strategy, is compared to the ones
of recently proposed algorithms involving global event reweighting.
We use the new algorithms to improve on our previous study of the
effects of Bose-Einstein correlations on the W mass measurement at
2. The intrinsic uncertainty could be as high as 100 MeV but
is probably reduced to the order of 30 MeV with realistic
experimental reconstruction procedures.
Copyright Springer-Verlag
