Difference between revisions of "Recoil proton reconstruction"
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[[Image:p_eta_kin.png | 500px]] | [[Image:p_eta_kin.png | 500px]] | ||
| − | # Proton polar angle versus | + | # Proton polar angle versus momentum for generated events (top left) |
| − | # Momentum distributions for generated and reconstructed protons as a function of the | + | # Momentum distributions for generated and reconstructed protons as a function of the generated momentum (top right) |
# Polar angle of reconstructed protons as a function of the generated proton momentum (middle left) | # Polar angle of reconstructed protons as a function of the generated proton momentum (middle left) | ||
# Chisq/Ndof for reconstructed protons (middle right) | # Chisq/Ndof for reconstructed protons (middle right) | ||
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* '''Momentum resolution and reconstruction bias''' | * '''Momentum resolution and reconstruction bias''' | ||
| − | [[Image:p_eta_mom_res.png | | + | [[Image:p_eta_mom_res.png | 400px]] |
# Reconstruction bias (top). The mean value of residual distributions, < p_rec - p_gen >, as a function of the proton generated momentum, p_gen. | # Reconstruction bias (top). The mean value of residual distributions, < p_rec - p_gen >, as a function of the proton generated momentum, p_gen. | ||
# Energy resolution dp/p (bottom). | # Energy resolution dp/p (bottom). | ||
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* '''Polar angle of reconstructed protons''' | * '''Polar angle of reconstructed protons''' | ||
| − | [[Image:p_eta_theta_resid.png | | + | [[Image:p_eta_theta_resid.png | 350px]] |
| − | [[Image:p_eta_theta_res.png | | + | [[Image:p_eta_theta_res.png | 350px]] |
| − | # Residuals, theta_rec - theta_gen (left plot) | + | # Residuals, theta_rec - theta_gen (left plot). |
# Polar angle resolution (right plot): | # Polar angle resolution (right plot): | ||
| − | :: < theta_rec - theta_gen >, as a function of the | + | :: < theta_rec - theta_gen >, as a function of the generated proton momentum, p_gen (top) |
| − | :: sigma(theta) in | + | :: sigma(theta) in degrees (bottom) |
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* '''Proton reconstruction efficiency''' | * '''Proton reconstruction efficiency''' | ||
| − | [[Image:p_eta_rec_eff.png | | + | [[Image:p_eta_rec_eff.png | 400px]] |
Revision as of 11:49, 2 October 2011
gamma p -> p eta decays
- Recoil proton kinematics
- Proton polar angle versus momentum for generated events (top left)
- Momentum distributions for generated and reconstructed protons as a function of the generated momentum (top right)
- Polar angle of reconstructed protons as a function of the generated proton momentum (middle left)
- Chisq/Ndof for reconstructed protons (middle right)
- Ndof distribution (bottom left)
- Ndof versus proton momentum (bottom right)
- Proton momentum residuals
No cuts
Chisq/Ndof < 10
p(rec) - p(gen) as a function of the genarted proton's momentum.
- Momentum resolution and reconstruction bias
- Reconstruction bias (top). The mean value of residual distributions, < p_rec - p_gen >, as a function of the proton generated momentum, p_gen.
- Energy resolution dp/p (bottom).
- Polar angle of reconstructed protons
- Residuals, theta_rec - theta_gen (left plot).
- Polar angle resolution (right plot):
- < theta_rec - theta_gen >, as a function of the generated proton momentum, p_gen (top)
- sigma(theta) in degrees (bottom)
- Proton reconstruction efficiency
- Eta missing mass distribution
- Missing masses were computed for different momentum ranges of
generated protons. Reconstructed proton tracks were required to satisfy chi2/ndof < 10. The top left plot represents the missing mass distribution for all reconstructed protons.
gamma p -> p pi0 decays
- Recoil proton kinematics
- Proton polar angle versus proton momentum for generated events (top left)
- Momentum distributions for generated and reconstructed protons as a function of the p generated momentum (top right)
- Polar angle of reconstructed protons as a function of the proton generated momentum (middle left)
- Chisq/Ndof for reconstructed protons (middle right)
- Ndof distribution (bottom left)
- Ndof versus proton momentum (bottom right)
- Proton momentum and polar angle resolutions
- Reconstruction bias (top). The mean value of residuals, < p_rec - p_gen >, as a function of p_gen.
- Energy resolution dp/p (bottom). The distribution was fit to the function p1/sqrt(x) + p2
- Reconstruction bias (top). The mean value of residuals, < theta_rec - theta_gen >, as a function of theta_gen.
- Angular resolution sigma(theta) in degrees (bottom). The distribution was fit to the function p1/x + p2
- pi0 missing mass distribution
- Missing masses were computed for different momentum ranges of generated protons. Reconstructed proton tracks were required to satisfy chi2/ndof < 10. The top left plot represents the missing mass distribution for all reconstructed protons.
- Toy MC: pi0 missing mass distributions for various momentum and angular resolutions
- Missing mass distributions for pi0 and eta
