Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-05-30
Z.Phys. C74 (1997) 493-500
Physics
High Energy Physics
High Energy Physics - Phenomenology
28 pages, LaTeX, including 9 PostScript figures embedded via epsfig, uses axodraw.sty and rotate.tex, complete paper available
Scientific paper
10.1007/s002880050411
An important issue in the direct reconstruction method of determining the $W$ mass from $q\bar q Q\bar Q$ events at LEP2 concerns the impact of the relatively unknown QCD interconnection effects. It has been suggested that a study of `short string' states, in which colour singlet states are formed from $q \bar Q $ and $Q\bar q$ pairs with small phase--space separation, could shed important light on this issue. We show that such configurations can also be generated by conventional background $e^+e^-\ar 4$~parton processes, in particular QCD $q \bar q g g$ and $q \bar q Q \bar Q$ and non--resonant electroweak $q \bar q Q \bar Q$ production. We study the colour and kinematic structure of these background contributions, and estimate the event rate to be expected at LEP2. We find that the QCD processes are heavily suppressed, but that non--resonant $q \bar q Q \bar Q$ production may be comparable in rate to the expected `short string' signal from $W^+W^-$ production.
Ballestrero Alessandro
Khoze Valery A.
Maina Ezio
Moretti Sébastien
Stirling James W.
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