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 With TCFIT

 With TCFIT. J. Bouchet. outlines. In continuation of my previous work, I ‘ve tried the πp decay (c ~ 7.89 cm) Not a big change in the code : replacement of the kaon daughter by a proton daughter Be careful with the silicon hits cut because the first SVT layer is < c

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 With TCFIT

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  1.  With TCFIT J. Bouchet

  2. outlines • In continuation of my previous work, I ‘ve tried the πp decay (c ~ 7.89 cm) • Not a big change in the code : replacement of the kaon daughter by a proton daughter • Be careful with the silicon hits cut because the first SVT layer is < c • Same idea as before : look at the only cut length/dslength

  3. Slength/dslength distribution zoom • ~5M events process • Only π-p decay (not the opposite sign) • Additionnal cut in the macro : dcaXYπ*dcaXYproton <0

  4. Inv. mass Before cut After cut • From slide 3, I’ve applied a cut at L/dL>11 • From the fit, mean is OK ; rms looks lower than expected (~3-4 MeV/c2) • Still background remaining with this only cut

  5. Modification of the code for cascade • For example -(π-p)+ π- • In the code : • Do the  reconstruction • TCFIT variables will refer to this decay • Add a third loop and select a pion candidate • Calculate the inv mass with the pion and the reconstructed 

  6. Invariant mass • Plot left : inv. Mass before cuts • Plot right : inv mass after the cuts : • 1.11<Mass  <1.12 && (slength/dslength)>11 (basically the same cuts of slide 4 where the peak is clear) • No peak is seen require another cuts

  7. summary • As for the K0s, a cut on L/dL is relatively efficient • Need more work and another cuts for the cascade decay • Future : this decay could be used in : • D*+D0πs+

  8. dEdx vs momentum for daughters protons : |n|<2 pions : |n|<2

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