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geometrical acceptance evaluation

E p ,x p , t p. E g , t g ,x g. p ±. x K. p K. l K. K mn tag. t m. t 0. p K. p 0. # DC vtx (K  X p 0 ) in FV. a =. # p 0 vtx. E g , t g ,x g. geometrical acceptance evaluation.

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geometrical acceptance evaluation

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  1. Ep,xp,tp Eg,tg,xg p± xK pK lK Kmn tag tm t0 pK p0 # DC vtx (K X p0) in FV a = # p0 vtx Eg,tg,xg geometrical acceptance evaluation given the reconstructed K- track of the tagging side, we know momentum and direction of the K+, and we step along its path where the neutral decay vertex is found using the timing of the neutral clusters fired by the gs of the p0 decay K charged meeting - 21 April 2005 – P. de Simone

  2. green rxy kine (K+ Xp0) red rxy from p0 vtx we should see some nucl. int. on BP and DC walls .. !! BP DC rxy cm the ratio of the 2 distributions is flat up to  100 cm where resolution effects due to the multiple scattering becomes dominant rxy cm K charged meeting - 21 April 2005 – P. de Simone

  3. red rxy from p0 vtx MC blue rxy from p0 vtx DATA we should see some nucl. int. on BP and DC walls .. !! BP DC rxy cm .. low statistic 7.5 pb-1 .. poor rxy resolution s 2cm .. respect to the BP & DC walls !! red rxy resolution rxy(kine)  100cm green rxy resolution rxy(kine)  100cm  it will be very interesting to give a look at K- soon !! K charged meeting - 21 April 2005 – P. de Simone

  4. K+ Xp0 geometrical acceptance vs p+momentum red  MC blue  data green  MC truth Psec MeV ( MC – data ) Psec MeV K charged meeting - 21 April 2005 – P. de Simone

  5. K+ Xp0 geometrical acceptance vs q kaon red  MC blue  data green  MC truth ( MC – data ) between 240 and 1560 we look for the g’s … !! K charged meeting - 21 April 2005 – P. de Simone

  6. K+ Xp0 geometrical acceptance vs q kaon ratio between the MC truth and the MC rec distributions ratio between the MC rec and data distributions K charged meeting - 21 April 2005 – P. de Simone

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