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HES-HKS analysis meeting. Toshiyuki Gogami 10Jan2014. Contents. About missing mass resolution Blind analysis Resolution and linearity balance Response function Missing mass status Binding energy and c ross section 12 Λ B, 10 Λ Be and 7 Λ He.

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Hes hks analysis meeting

HES-HKS analysis meeting

Toshiyuki Gogami

10Jan2014


Contents
Contents

  • About missing mass resolution

  • Blind analysis

    • Resolution and linearity balance

    • Response function

  • Missing mass status

  • Binding energy and cross section

    • 12ΛB, 10ΛBe and 7ΛHe


Missing mass estimation by the full modeled monte carlo simulation
Missing mass estimation by the full-modeled Monte Carlo simulation


Achievable resolution
Achievable resolution

( FWHM, Unit: keV )

Part of the z-dependence (Λ, Σ0 and 12ΛB) is absorbed by the matrices in a matrix tuning.

 Effects of z-dependence absorption for other hypernuclei are not trivial.

 Blind analysis


Blind analysis
Blind analysis

  • Width and linearity balance

    • Matrix z-dependence (Λ,Σ0) absorption effect for hypernuclei

  • Response function


Flow chart
Flow chart

Initial matrices

(not distorted)

Generated

Λ, Σ0 and hypernucei

Λ + B.G.

Σ0 + B.G.

12ΛB s-shell

Tune

Compare after tuning

Tuned matrices

Λ, Σ0 and hypernucei

  • Absorbing effects of

  • z-dependence

  • Asymmetry shape

  • Etc.


Results

Λ + B.G.

Σ0 + B.G.

12ΛB s-shell

Results

No matrix distortion

+

Mean value displacement

Width

Λ, Σ0

Λ, Σ0

Λ, Σ0, 12ΛB

FWHM [keV]

ΔMM [keV]

Λ, Σ0, 12ΛB

500 ~ 700 keV (12ΛB, 10ΛB, 52ΛV)

~ 1000 keV (7ΛHe)

~ 1500 keV (Λ, Σ0)

ΔMM < 130 keV

Achievable resolutions

Achieved

simultaneously !



Missing mass status
Missing mass status

  • 12C(e,e’K+)12ΛB

  • 7Li(e,e’K+)7ΛHe

  • 10B(e,e’K+)10ΛBe

  • 9Be(e,e’K+)9ΛLi

  • 52Cr(e,e’K+)52ΛV


12 c e e k 12 b
12C(e,e’K+)12ΛB


7 li e e k 7 he
7Li(e,e’K+)7ΛHe


10 b e e k 10 be
10B(e,e’K+)10ΛBe


9 be e e k 9 li
9Be(e,e’K+)9ΛLi

Accidental background


52 cr e e k 52 v
52Cr(e,e’K+)52ΛV


Binding energy and cross section
Binding energy and Cross section

  • About cross section

    • Definition

    • Cut conditions

    • Efficiencies and correction factors

  • Results

    • 12C(γ*,K+)12ΛB

    • 7Li(γ*,K+)7ΛHe

    • 10B(γ*,K+)10ΛBe


Definition of differential cross section
Definition of differential cross section

Number of target protons

Efficiencies

HKS acceptance

Number of virtual photon

including HES acceptance


Cut conditions
Cut conditions

  • 0.80 < pe < 0.98 [GeV/c]

  • Abs(m2-m2K) < 0.3

  • -1.0 < ctime < 1.0


Efficiencies and correction factors
Efficiencies and correction factors

  • Efficiencies

    • DAQ

    • Trigger

    • Tracking

    • K+ selection

      • AC, WC, m2,

  • Correction factors

    • K+ decay (momentum dependent)

    • Solid angle (momentum dependent)

    • K+ absorption

    • Event loss due to matrix and large energy loss (not included for the present work)

      • Already studied by Fujita

~ 5- 10%


12 c target
12C target

  • Remarks

  • Efficiencies are different between low and high current data

  • Two set of HES collimator positions are used.


Differential cross section of 12 c k 12 b
Differential cross section of 12C(γ*,K+)12ΛB

( FWHM ~ 0.89 MeV )

Only statistical errors


12 b comparison
12ΛB comparison


7 li target
7Li target

  • Remarks

  • Target thickness (Three values)

    • Shichijo: 184.0 mg/cm2

    • ELOG

      • Weight and area: 331.2 mg/cm2

        • Oil ? Nitriding ?

      • Thickness and density: 207 mg/cm2

  • Nitriding test

  • Check Brems. Rate in HES

  • Etc.

Need to be done !!!!


Differential cross section of 7 li k 7 he
Differential cross section of 7Li(γ*,K+)7ΛHe

( FWHM ~ 1.3 MeV )


7 he comparison
7ΛHe comparison

( FWHM ~ 1.3 MeV )

-5.36 without CSB

-5.16 with CSB

(FWHM ~ 1.3 MeV)

Hiyama’s calc.


10 b target
10B target


Differential cross section of 10 b k 10 be
Differential cross section of 10B(γ*,K+)10ΛBe

( FWHM ~ 0.8 MeV )



Differential cross section of 10 b k 10 be1
Differential cross section of 10B(γ*,K+)10ΛBe

Motoba’s calc.

( FWHM ~ 0.8 MeV )

-8.84 without CSB

-8.76 with CSB

Hiyama’s calc.


9 be k 9 li only figure
9Be(γ*,K+)9ΛLi (only figure)


Summary
Summary

  • Estimated missing mass resolution

  • Blind analysis

    • Resolution and linearity balance

    • Response function

  • Missing mass status

  • Binding energy and cross section

    • 12ΛB, 10ΛBe and 7ΛHe



Expected achievable missing mass resolution
Expected achievable missing mass resolution

  • 分解能の表

    • 各寄与

    • Z-depenenceを引いた後に残る分解能

Tuningでz-dependenceを吸収

 Resolution ? Linearity?

Blind analysis (next)


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