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FINUDA luminosity monitor

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 )

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FINUDA luminosity monitor

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  1. e- Alessandro Feliciello I.N.F.N. - Sezione di Torino e+ Workshop on Hypernuclear Physics at DAFNE March 20 - 22, 2002, Iseo (BS) FINUDAluminosity monitor

  2. 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

  3. The typical event

  4. Vertex reconstruction Monte Carlo reconstruction

  5. Momentum reconstruction Monte Carlo 89% 4 hits reconstruction e+

  6. Momentum reconstruction e- Monte Carlo 93% 4 hits reconstruction

  7. Efficiency asymmetry erec = 46% erec = 62%

  8. Multiplicity & T.o.F. • Bhabha • K+K- • KsKl • Touschek

  9. Slab angular correlation • Bhabha • K+K- • KsKl • Touschek

  10. The FINUDA strategy • imult: multiplicity = 2 on ITOF • back: exact back-to-back topology on ITOF • emult: multiplicity = 2 ÷ 4 on ETOF • tof: Dt between ITOF and ETOF = 4.5 ÷ 6.5 ns • energy: small dE/dx inside ITOF

  11. Cross section z = cosJ (J » 0°) s = 1.0404 GeV2 (45° <J < 135°)

  12. Event rate @ £ =5 1031 cm-2s-1 • 45° < J < 135° • sBhabha = 810 nb • etrigger ~ 0.74% ~ 30 Hz ~ 10 Hz • erec ~ 0.33% FINUDA needs 45’ to give £ value @ 1%

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