Difference between revisions of "Recoil proton reconstruction"
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* '''Recoil proton kinematics''' | * '''Recoil proton kinematics''' | ||
| − | |||
[[Image:p_eta_kin.png | 500px]] | [[Image:p_eta_kin.png | 500px]] | ||
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* '''Proton momentum residuals''' | * '''Proton momentum residuals''' | ||
| − | |||
[[Image:p_eta_presid_no_cut.png | 300px]] | [[Image:p_eta_presid_no_cut.png | 300px]] | ||
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* '''Momentum resolution and reconstruction bias''' | * '''Momentum resolution and reconstruction bias''' | ||
| − | |||
[[Image:p_eta_mom_res.png | 350px]] | [[Image:p_eta_mom_res.png | 350px]] | ||
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* '''Polar angle of reconstructed protons''' | * '''Polar angle of reconstructed protons''' | ||
| − | |||
[[Image:p_eta_theta_resid.png | 300px]] | [[Image:p_eta_theta_resid.png | 300px]] | ||
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* '''Proton reconstruction efficiency''' | * '''Proton reconstruction efficiency''' | ||
| − | + | [[Image:p_eta_rec_eff.png | 350px]] | |
| − | [[Image:p_eta_rec_eff.png | | + | |
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* '''Eta missing mass distribution''' | * '''Eta missing mass distribution''' | ||
| − | + | [[Image:p_eta_mis_mas.png | 400px]] | |
| − | [[Image:p_eta_mis_mas.png | | + | |
# Missing masses were computed for different momentum ranges of | # Missing masses were computed for different momentum ranges of | ||
generated protons. Reconstructed proton tracks were required to | generated protons. Reconstructed proton tracks were required to | ||
| Line 66: | Line 60: | ||
== gamma p -> p pi0 decays == | == gamma p -> p pi0 decays == | ||
| − | * Recoil proton kinematics | + | |
| + | * '''Recoil proton kinematics''' | ||
[[Image:p_pi_kin.png | 400px]] | [[Image:p_pi_kin.png | 400px]] | ||
| Line 76: | Line 71: | ||
# Ndof versus proton momentum (bottom right) | # Ndof versus proton momentum (bottom right) | ||
| − | * Proton momentum and polar angle resolutions | + | |
| + | |||
| + | * '''Proton momentum and polar angle resolutions''' | ||
[[Image:p_pi_mom_res.png | 300px]] | [[Image:p_pi_mom_res.png | 300px]] | ||
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# Angular resolution sigma(theta) in degrees (bottom). The distribution was fit to the function p1/x + p2 | # Angular resolution sigma(theta) in degrees (bottom). The distribution was fit to the function p1/x + p2 | ||
| − | * pi0 missing mass distribution | + | |
| + | |||
| + | * '''pi0 missing mass distribution''' | ||
| + | |||
[[Image:p_pi_mis_mas.png | 300px]] | [[Image:p_pi_mis_mas.png | 300px]] | ||
# 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. | # 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 | + | |
| + | |||
| + | * '''Toy MC: pi0 missing mass distributions for various momentum and angular resolutions''' | ||
| + | |||
[[Image:p_pi_mm_toy1.png | 300px]] | [[Image:p_pi_mm_toy1.png | 300px]] | ||
[[Image:p_pi_mm_toy2.png | 300px]] | [[Image:p_pi_mm_toy2.png | 300px]] | ||
[[Image:p_pi_mm_toy3.png | 300px]] | [[Image:p_pi_mm_toy3.png | 300px]] | ||
| − | * Missing mass distributions for pi0 and eta | + | |
| + | |||
| + | * '''Missing mass distributions for pi0 and eta''' | ||
| + | |||
[[Image:comp_mis_mas.png | 500px]] | [[Image:comp_mis_mas.png | 500px]] | ||
Revision as of 00:26, 2 October 2011
gamma p -> p eta decays
- Recoil proton kinematics
- Proton polar angle versus proton 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 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
- Polar angle residuals, theta_rec - theta_gen (left plot)
- Polar angle resolution (right plot):
- < theta_rec - theta_gen >, as a function of the proton generated momentum, p_gen (top).
- sigma(theta) in units if degree (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
