impact parameters in p11 07 n.
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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)

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Impact parameters in p11.07


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impact parameters in p11 07
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)

slide2

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)

slide3

The mean dca resolution is improved : 50 μm in p11.07, 90 μm in p10.15

(cm)

D. Bloch (IReS Strasbourg)

slide4
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)

slide5

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)

slide6

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)

slide7

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)

slide8

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)

slide9

The significance has a resolution of 1 after these corrections

D. Bloch (IReS Strasbourg)

summary
Summary

Very nice prospects with p11.07 !

Correction factor depending on p sin³/²θ to be applied

D. Bloch (IReS Strasbourg)