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 )

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Good Tracks (Stv & Sti)

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Hits per track(Stv & Sti)

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Hits per track : Pt (Stv & Sti)

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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)

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Dca00 (Stv & Sti)

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Victor Perevoztchikov, BNL StarSoft local

DcaXY & DcaZ to McVtx(Stv & Sti)

STAR Victor Perevoztchikov, BNL StarSoft local

Global Pt,tan(λ),ψ (Stv & Sti)

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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.