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Particle Reconstruction Algorithm for Slow Tracks in Particle Physics Experiments

This algorithm describes the reconstruction of slow particles in particle physics experiments, focusing on identifying tracks with large energy losses for calibration and mass parameter contours. It includes the use of angular cuts on track candidates and negative particles for dE/dx calibration. The algorithm also outlines the reconstruction process for both experimental and Monte Carlo data, with a specific focus on slow tracks in PR00 data.

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Particle Reconstruction Algorithm for Slow Tracks in Particle Physics Experiments

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  1. Slow particles reconstruction R.Hołyński, A.Olszewski, P. Sawicki, A. Trzupek, B.Wosiek, K.Woźniak • Algorithm description • Large dE hits • Angular cuts on track candidates • Negative particles as a “source” of dE/dx calibration • Mass parameter contours (PID) • Reconstruction of experimental and MC data • Slow tracks in PR00 data • MC study of reconstructed slow tracks sample • Search for f K K • MC studies

  2. F X[cm] E D C B A Algorithm description We are looking for particles which range out in plane E MC min. ion. From the data hits with large energy losses in planes A-E are selected:dEi /dx > 0.5 MeV Z[cm] pp  50 MeV/c, pK 140 MeV/c, pp  200 MeV/c

  3. Algorithm description • Hits with large energy deposits are used to form 5-hits • tracks candidates (one hit per plane). • Track candidates undergo angular cuts: • | i+1 - i | <  • (i, i from vertex position) • | i+1 - i | <  • MC:  < [2.1o, 3.9o, 2.6o, 7.5o] •  < [2.4o, 4.2o, 2.7o, 6.7o] • AB BC CD DE • 99.5% hits

  4. Negative particles as a “source” of dE/dx calibration

  5. Negative particles as a “source” of dE/dx calibration MC: dE/dxE > 7 MeV only for negative stopping particles

  6. Reconstruction of negative pions from experimental and MC data (Zvert > -7cm, <15cm) PR00: 58000 events ~41000 CENTRAL events ~17000 MB events PR01: 85000 events ~25000 CENTRAL events ~60000 MB events MC: 101000 events ~51000 CENTRAL events ~50000 MB events PR00 PR01 MC # - 7372 145 MC sample contains 85% of negative pions

  7. dE/dx calibration by negative particles

  8. dE/dx calibration by negative particles

  9. dE/dx calibration by negative particles

  10. dE/dx calibration by negative particles Calibration factors for: PR00 PR01 PR00+PR01 Plane A: 1.12 1.14 1.128 Plane B: 1.15 1.13 1.133 Plane C: 1.14 1.14 1.127 (dE/dx)MC= 1.13 (dE/dx)exp

  11. Eloss Mp Candidate tracks are identified on Mp and Eloss plane (Mp)i = (dE/dx)i * Ei (1/2) (m 2) Eloss = ΣdEi /nhits, i=A-E PID contours p K 

  12. Reconstruction of experimental and MC data PR00 MC   442 502 K 55 81 p 28 104 ! Number of reconstructed particles depends on the (dE/dx)Fveto(=1 MeV)

  13. Reconstruction of experimental and MC data

  14. Reconstruction of MC data slow pion = pion having hits in A-D or A-E

  15. Reconstruction of MC data slow pion = pion having hits in A-D or A-E

  16. Reconstruction of MC data slow pion = pion having hits in A-D or A-E

  17. Reconstruction of MC data slow pion = pion having hits in A-D or A-E

  18. Reconstruction of MC data slow pion = pion having hits in A-D or A-E

  19. Reconstruction of MC data

  20. Reconstruction MC data

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