STAR
StiVmc
V. PerevoztchikovBrookhaven National Laboratory,USA
STAR Victor Perevoztchikov, BNL StarSoft local
Compare
Variable Stv Sti Who is better
nGlob(All)/evt 410 535 -23%
nPrim(All)/Evt 222 234 -5%
nGlob (hit>15) 358 356 +0.6%
nPrim(hit>15) 215 201 +7%
nGlobHit 26.1 21.7 +20%
nPrimHit 28.8 26.0 +11%
nGlobHit(tg>3) 25 18 +40%
nPrimHit(tg>1.5) 20 13 +50%
dP/Pgl(p<0.1) -2% -2% 0
dP/Ppr(p<0.1) --- -2% ?
STAR Victor Perevoztchikov, BNL StarSoft local
Compare.2Variable Stv Sti Who is better
dVx 0.13 0.19 +0.6mm
dVy 0.13 0.17 +0.5mm
dVz 0.10 0.10 0.0mm
Dca00.glob 2.70 2.84 +1.4mm
Dca00.prim 1.07 1.12 +0.5mm
DcaXY.glob 2.74 2.89 +5%
DcaZ.glob 1.72 1.86 +8%
DcaXY.prim 1.07 1.12 +5%
DcaZ.prim 0.46 0.48 +4%
dPt.glob 3.8% 3.8% 0
dPt.prim 2.5% 1.7% -0.8
STAR Victor Perevoztchikov, BNL StarSoft local
Compare.3
Variable Stv Sti Who is better
TanL.glob 2.9% 2.9% 0
TanL.prim 2.4% 2.5% +0.1
Psi.glob 0.6 deg 1.0 deg +0.4 deg
Psi.prim 0.6 deg 0.7 deg +0.05 deg
STAR Victor Perevoztchikov, BNL StarSoft local
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All Tracks(Stv & Sti )
STAR Victor Perevoztchikov, BNL StarSoft local
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Good Tracks (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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Hits per track(Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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Hits per track : Pt (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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Hits/Track : tan(λ) (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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dP/P :P (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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dVtx (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
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Dca00 (Stv & Sti)
STAR
Victor Perevoztchikov, BNL StarSoft local
DcaXY & DcaZ to McVtx(Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
Global Pt,tan(λ),ψ (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
Primary Pt,tan(λ),ψ (Stv & Sti)
STAR Victor Perevoztchikov, BNL StarSoft local
Summary
Sti has more globals & primaries in total. But Stv has more good globals & primaries. (nHits>15). What does it mean?;
Stv has better or equal accuracy almost everywhere ; Stv has more hits on tracks, especially with big λ or small Pt,
which was expected; Sti has slightly better accuracy improvement when primary vertex
included. Probably it is related to refitting with primary vertex which is not used in Stv yet.
Sti & Stv have the same accuracy in energy loss. That means, in spite of very poor Sti geometry description, Yuri succeeded to define it very well.
Stv is not yet tested for Svt, Ssd, Ftpc etc… But Stv must work for Ftpc and other non TPC like detectors.
In both cases (Stv & Sti) hit errors are not good. In result pulls are big (Stv around 5 and for Sti around 3). Fit of errors is needed for both.