HES HKS meeting

3/4/2010T.Gogami

Chromium replay with rev.256 and rev.354

Compare with rev.256 and rev.354 The number of kaon β-βK vs. WC NPE

Chromium replay with rev.256 and rev.354

Run 77092 – 77094 (merged)

Cut NPE AC1+2+3 < 5 NPE WC1+2 >20 (low momentum side) NPE WC1+2 >80 (high momentum side) -0.09 < β – βK < 0.2 (low momentum side) -0.11 < β – βK < 0.2 (high momentum side) Back ground in HKS

We can see cluster clearly

K+ 3.2% K+ 2.8%

Event num. w/ cut All event num.

Chromium replay with rev.256 and rev.354

Run 77092 – 77094 (merged)

Cut NPE AC1+2+3 < 5 NPE WC1+2 >20 (low momentum side) NPE WC1+2 >80 (high momentum side) -0.09 < β – βK < 0.2 (low momentum side) -0.11 < β – βK < 0.2 (high momentum side) Back ground in HKS

We can see cluster clearly

Data quality is better

K+ 3.2% K+ 2.8%

HES solid angle

θ = acos( 0.97 + (0.03 * G4UniformRnand()) )

φ = π * G4UniformRand()　

0.97 – 1.00

0 – 0.28

Momentum

θ vs. φ

X’ vs. y’ at target

X vs. y at EQ1 entrance

HES solid angle

?Smaller than expected

HES solid angle

Summary and to do

Sum Chromium run replay

Looks better Rev.354 than rev.256 HES solid angle

5 [msr] ?

To do Cr

MM , cointime GEANT4

Spherical uniform distribution solid angle Collaboration meeting JPS Master’s thesis

Appendix http://lambda.phys.tohoku.ac.jp/~gogami/Mthesis/GT/gogami_Mthesis1.4.pdf

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