1 / 6

More universal curve fits

More universal curve fits. Matthew Jones. May 12, 2004. New stuff: Included low p T  e + e - Examined low p T biases in dE/dx Sample parameter sets ready. Low p T Conversions. Low p T conversion selection: One leg has p T > 0.5 GeV/c |d 0 (e § )| > 0.1 cm (ie, not SVT tracks)

fergal
Download Presentation

More universal curve fits

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. More universal curve fits Matthew Jones May 12, 2004 • New stuff: • Included low pTe+e- • Examined low pT biases in dE/dx • Sample parameter sets ready

  2. Low pT Conversions • Low pT conversion selection: • One leg has pT > 0.5 GeV/c • |d0(e§)| > 0.1 cm (ie, not SVT tracks) • |Sxy| < 4 cm at cotangent point • | z| < 4 cm at cotangent point • |d0()| < 0.3 cm • 10 < R < 35 cm • Fit  cot  for signal fraction

  3. Low pT conversions • Fit with 3 Gaussians • Example:

  4. Universal curve fits • Simultaneous fit to TOF+dE/dx data and  cot+dE/dx from conversions. Pions Electrons Pions Electrons

  5. Universal curve fits • Conversions did not change fit parameters significantly. • Still see systematic bias at low momenta:

  6. Summary • Is there enough freedom in the standard universal curve parameterization? • Need to study different resolution functions • Current set of parameters available for further study: http://www.physics.purdue.edu/~mjones/dedx

More Related