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Impact parameters in p11.07

This study, led by Daniel Bloch (IReS Strasbourg), compares data from two runs (p10.15 and p11.07) using primary vertex selections and different track configurations. The results highlight significant improvements in primary vertex resolution, with a decrease from 110 μm in p10.15 to 60 μm in p11.07. Additionally, the mean DCA resolution also showed enhancement, from 90 μm to 50 μm. The correction factor for DCA errors was found to be 1.06 in p11.07, indicating better accuracy in multiple scattering effects, offering promising prospects for future analyses.

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Impact parameters in p11.07

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  1. Impact parameters in p11.07 Daniel Bloch + D.Gelé, S.Greder, I. Ripp-Baudot (IReS Strasbourg) • Compare on run 152422 p10.15 (normal processing, using 60000 events) and p11.07 (reprocessed by Suyong, 90000 events) • Require a primary vertex (pvsel) with 3 tracks (i.e pvsel built with SMT tracks only for p10.15, but with a mixture of SMT and/or CFT tracks for p11.07) and ask –0.15<Xpv<0.15 cm, -0.2<Ypv<0.2 cm • for p10.15: use gtr333 tracks (SMT+CFT), ask nhits11 for p11.07: use gtrack’s, ask 4 SMT hits and 15 CFT hits • compute the transverse dca versus the primary vertex, and ask |dca|<0.1 cm and pT>0.5 GeV : that’all, no jets are used D. Bloch (IReS Strasbourg)

  2. p11.07 p10.15 X X The primary vertex resolution is much better : 60 μm in p11.07110 μm in p10.15 (cm) Y Y (cm) D. Bloch (IReS Strasbourg)

  3. The mean dca resolution is improved : 50 μm in p11.07, 90 μm in p10.15 (cm) D. Bloch (IReS Strasbourg)

  4. Then, consider the quantity pSCAT = p sin³´²θ which describes multiple scattering effects in the transverse plane • Split in different pSCAT bins and in each bin: take the mean computed dca error σdcaand fit the dca/σdca distributions (with a Gaussian and 2 exponential tails) • Define the “fitted” error σFIT = σdca the width of the previous Gaussian D. Bloch (IReS Strasbourg)

  5. the dca error is parameterised asσFIT = a/[p sin³´²θ] + b asymtotic resolution ~20 μm in p11.07 and~50 μm in p10.15 red dots: σFITblue square: σDCA σ (μm) σ(μm) p11.07 p10.15 p sin³´²θ (GeV) D. Bloch (IReS Strasbourg)

  6. quite similar dependence in p10.15 for run 152422 or for all muon+jet runs 144000-151000 red dots: σFITblue square: σDCA σ(μm) σ (μm) p10.15 p10.15 p sin³´²θ (GeV) D. Bloch (IReS Strasbourg)

  7. The correction factor to be applied on the computed dca error is 1.06 in average in p11.07, but it is a factor two in p10.15, and this is mometumangle dependent σFIT/σdca p11.07 p10.15 p sin³´²θ (GeV) D. Bloch (IReS Strasbourg)

  8. The quadratic difference between the fitted and computed dca error is also momentumangle dependent, but is much smaller in p11.07 (μm) p11.07 p10.15 (μm) quadratic difference σFIT -σdca p sin³´²θ (GeV) D. Bloch (IReS Strasbourg)

  9. The significance has a resolution of 1 after these corrections D. Bloch (IReS Strasbourg)

  10. Summary Very nice prospects with p11.07 ! Correction factor depending on p sin³/²θ to be applied D. Bloch (IReS Strasbourg)

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