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Real p T D 0

Real p T D 0. J. Bouchet. input. Generate a p T distribution with a power law function : d 2 N/dp T dy = A[1 +p T /p0] n with <p T > = 2p0/(n-3) for a better extrapolation at p T  0 Ref : Manuel Calderon (thesis)

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Real p T D 0

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  1. Real pT D0 J. Bouchet

  2. input • Generate a pT distribution with a power law function : d2N/dpTdy = A[1 +pT/p0]n with <pT> = 2p0/(n-3) for a better extrapolation at pT0 Ref : • Manuel Calderon (thesis) • Transverse momentum spectra of charged particle in ppbar collisions at sqrt(s) = 630 GeV Phys. Letter B 366(1996)434-440 • Pick randomly values in this distribution • changing n from 10 to 14 does not really modify the shape (which is what we want) of the pT distribution • So I chose n=10, <pT>=1 GeV/c

  3. check Generated function • Values (here 10kevents) • Randomly picked • Mean <pT> is 1

  4. Next step • Run the bfc chain with geometry y2007g • Use the slow simulator • Library : SL08f • Vertex fix : x =0.01cm ;y= 0.02 cm;z=0.4 cm (values chosen arbitrarily to avoid vertex = (0,0,0)) • D0 phase space : • 0 < pT < 5 GeV/C power law • -1 < y< 1 flat • 0 < phi < 6.28 flat Check the result from starsim : if D0 in fz file is correct

  5. Check fz file (i)

  6. Check fz file (ii) • distributions look as expected

  7. Check the MuDst file • after running the reconstruction, I have run MuKpi and checked the result • pT and the rapidity of reconstructed D0 look as the input All combinations K-π+ All combinations K-π+

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