FINUDA luminosity monitor
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A. Feliciello - WHPD - Iseo (BS), March 20 - 22, 2002 Alessandro Feliciello I.N.F.N. - Sezione di Torino Workshop on Hypernuclear Physics at DA Workshop on Hypernuclear Physics at DA NE NE March 20 - 22, 2002, Iseo (BS) March 20 - 22, 2002, Iseo (BS) FINUDA luminosity monitor e + e -
description
e -. Alessandro Feliciello I.N.F.N. - Sezione di Torino. e +. Workshop on Hypernuclear Physics at DA F NE March 20 - 22, 2002, Iseo (BS). FINUDA luminosity monitor. Monte Carlo simulation. same BHABHA event generator used by KLOE ( GEANFI ) - PowerPoint PPT Presentation
Transcript of FINUDA luminosity monitor
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Alessandro Feliciello
I.N.F.N. - Sezione di Torino
Workshop on Hypernuclear Physics at DAWorkshop on Hypernuclear Physics at DANENEMarch 20 - 22, 2002, Iseo (BS)March 20 - 22, 2002, Iseo (BS)
FINUDAluminosity
monitor
FINUDAluminosity
monitor
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Monte Carlo simulation same BHABHA event generator
used by KLOE (GEANFI)
two kind of processes accounted for: elastic scattering hard bremsstrahlung diffraction
25 mrad beam crossing angle taken into account
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The typical event
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Vertex reconstruction
Monte
Car
lo
Monte
Car
lo
reconstruction
reconstruction
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25Momentum
reconstruction
reconstruction
reconstruction
89%4 hits
89%4 hits
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Monte
Car
lo
Monte
Car
lo
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26Momentum
reconstruction
93%4 hits
93%4 hits
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Monte
Car
lo
Monte
Car
lo
reconstruction
reconstruction
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Efficiency asymmetry
rec = 46%
rec = 46%
rec = 62%
rec = 62%
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Multiplicity & T.o.F.
—Bhabha—K+K-
—KsKl
—Touschek
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Slab angular correlation
—Bhabha—K+K-
—KsKl
—Touschek
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The FINUDA strategycut Bhabha K+K- KsKl Touschek
none 1000 1000 1000 100000imult 981 523 368 2327back 864 306 84 2emult 739 171 60 0tof 739 138 55 0energy 739 18 55 0
acceptance 0.739 0.018 0.055 < 1.9 10-7
imult: multiplicity = 2 on ITOF back: exact back-to-back topology on ITOF emult: multiplicity = 2 ÷ 4 on ETOF tof: t between ITOF and ETOF = 4.5 ÷ 6.5 ns energy: small dE/dx inside ITOF
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Cross section
222
2
222
2
13
4114
211
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z
zsz
zzz
zsd
d
z = cos(» 0°)s = 1.0404 GeV2
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0
2
0 dd
dzd
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0
32
2
1163
9116
42
)zln(
zzz
zs
nb810
(45° < < 135°)
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Event rate
45° < < 135° Bhabha = 810 nb trigger ~ 0.74%
45° < < 135° Bhabha = 810 nb trigger ~ 0.74%
~ 30 Hz~ 30 Hz
rec ~ 0.33% rec ~ 0.33% ~ 10 Hz~ 10 Hz
@ £ = 5 1031 cm-2s-1@ £ = 5 1031 cm-2s-1
FINUDA needs 45’ to give £ value @ 1%
