Reconstruction of short- lived resonances in pp collisions F.Blanco – INFN e Università di Catania - Italy Content •Identification strategy •Code development •Results on resonances (K*(892),(1520),(1020),..) from simulated p-p events @ 900 GeV and @14 TeV •Summary and Outlook Convegno Nazionale Fisica di Alice, Frascati, 12-14 Novembre 2
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Reconstruction of short-lived resonances in pp collisions
Reconstruction of short-lived resonances in pp collisions. F.Blanco – INFN e Università di Catania - Italy. Content Identification strategy Code development Results on resonances (K*(892), (1520),(1020),..) from simulated p-p events @ 900 GeV and @14 TeV Summary and Outlook. - PowerPoint PPT Presentation
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Reconstruction of short-lived resonances in pp
collisions
F.Blanco – INFN e Università di Catania - Italy
Content•Identification strategy
•Code development
•Results on resonances (K*(892),(1520),(1020),..) from simulated p-p events @ 900 GeV and @14 TeV
•Summary and Outlook
Convegno Nazionale Fisica di Alice, Frascati, 12-14 Novembre 2007
Inside same event, correlations between
K+ and π- candidates
K- and π+ candidates
Evaluate invariant mass spectrum
Combinatorial background:
Signal extraction
Mixed-event technique
Like-sign technique
Example: K*(892) Kπ (~100%)
)()(2)( mNmNmNKKSignLike
Studied dependence on event selection criteria
●Charged multiplicity
●z-vertex location
Study of the combinatorial background by the mixed-event technique
Multiplicity
z-vertex
Comparison of the event mixing background to the “true” combinatorial backgroung
‘True’ background = (Signal) – (True pairs)
Only events with Δm<5 and Δzv < 3 cm mixed
No event selection
Only events with Δm<5 and Δzv < 3 cm mixed
Effect of event selection on mixing procedure
(True Background)
(Mixed events background)
Like-sign technique also explored
K* K*
Comparison of the like-
sign background to the “true” combinatorial background