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HES-HKS analysis meetingToshi Gogami5Mar2014

1Differential cross section of 12B by Motoba-san

DWIA , E = 1.5 GeV46Definition of differential cross section

Number of virtual photonincluding HES acceptanceNumber of target nucleusEfficienciesHKS acceptanceNOTE3Cut conditionsNOTE4Efficiencies and correction factorsEfficienciesDAQTriggerTrackingK+ selectionAC, WC, m2, Correction factorsK+ decay (momentum dependent)Solid angle (momentum dependent)K+ absorption Event loss due to matrix and energy lossSmall effect for hypernucelus systematic errorsAcceptance (real and simulation)Small discrepancy systematic error

NOTE5Systematic error for cross-section

Statistical error in simulationPosition accuracy of collimator (1mm)Acceptance discrepancy between sim. and realObtained by blind analysis6Systematic error for binding energyBlind analysis Date: 2/25 3/4Time: 92.5 hoursInitial matrices: distorted by handMomentum: , 0 and 12BAngle : and 0

(Different distortion pattern from previous study was tested)Simple report click here25Feb2014: mom (1:1:1) 3.5 hours26Feb2014: mom (1:1:1)27Feb2014: mom (1:1:1) 11hours28Feb2014: angle (1:1) 19 hours28Feb2014: mom (1:1:1) 7.5 hours1Mar2014: angle (1:1) 19 hours2Mar2014: mom(1:1:1) 11.5 hours3Mar2014: angle(1:1) 19 hours4Mar2014: mom (1:1:1) 12 hours

7Systematic error for binding energyBlind analysis Date: 2/25 3/4Time: 92.5 hoursInitial matrices: distorted by handMomentum: , 0 and 12BAngle : and 0

(Another distortion pattern was tested)

BeforeAfterIN PROGRESS25Feb2014: mom (1:1:1) 3.5 hours26Feb2014: mom (1:1:1)27Feb2014: mom (1:1:1) 11hours28Feb2014: angle (1:1) 19 hours28Feb2014: mom (1:1:1) 7.5 hours1Mar2014: angle (1:1) 19 hours2Mar2014: mom(1:1:1) 11.5 hours3Mar2014: angle(1:1) 19 hours4Mar2014: mom (1:1:1) 12 hours

812C(e,eK+)12B spectrum

CountCross sectionVirtual photon fluxEfficienciesAcceptance9 binding energy for 12C(e,eK+)12B

(FWHM: 500 keV)Click to see previous results1012B comparisonExperimentKLab [degree]-B [MeV]Cross section [nb/sr]Extracted value fromMotoba-sans predictionE05-1156.8-11.38 0.02 sys. error97.8 3.6 11.575E01-0115.8-11.40 0.01 0.04101 4.2 (+ 38 31)85E89-0090-11.52 0.35140 17 18120Emulsion-11.37 0.06N/AS ExperimentKLab [degree]

-B [MeV]Cross section [nb/sr]Extracted value fromMotoba-sans predictionE05-1156.8-0.43 0.03 sys. error84.1 3.3 9.985E01-0115.8-0.41 0.01 0.1394 4.0 3596E89-009-0.49 0.16N/Ap1110B(e,eK+)10Be spectrum

CountCross sectionVirtual photon fluxEfficienciesAcceptance12 binding energy for 10B(e,eK+)10Be

T.Cantiwell et al., NPA236 (1974) 445-456M.Juric et al., NPB52 (1973) 1-30(FWHM: 780 keV)13 binding energy for 10B(e,eK+)10Be

(FWHM: 780 keV)

-8.84 without CSB-8.76 with CSBHiyamas calc.Motobas calc.147Li(e,eK+)7He spectrum

CountCross sectionVirtual photon fluxEfficienciesAcceptance15 binding energy for 7Li(e,eK+)7He

(FWHM: 1300 keV)-5.36 without CSB-5.16 with CSBHiyamas calc.About target thickness click here16 binding energy for 7Li(e,eK+)7He

(FWHM: 1300 keV)-5.36 without CSB-5.16 with CSBHiyamas calc.

17Missing mass spectra9Be(e,eK+)9Li52Cr(e,eK+)52V

189Be(e,eK+)9Li spectrum

CountCross sectionVirtual photon fluxEfficienciesAcceptance199Be(e,eK+)9Li spectrum

209Be(e,eK+)9Li spectrum

M.Sotona and S.Frullani, PTP supplement No.117 (1994)

219Be(e,eK+)9Li spectrum rough comparison

J.J.LeRose et al., NPA804(2008)116-124F.Cusanno et al., NPA835(2010)129-135Hall-AHall-AHall-CHall-C22Missing mass spectrum of 52Cr (e,eK+)52V

Accidental backgrounds (?) JLab E05-11552Cr (e,eK+)52V23Missing mass spectrum of 52Cr (e,eK+)52V

Accidental backgroundJLab E05-11552Cr (e,eK+)52V

24Missing mass spectrum of 52Cr (e,eK+)52V

Accidental backgroundJLab E05-11552Cr (e,eK+)52V

25Summary and OutlookSummaryStatus of spectra

OutlookBlind analysis systematic error for binding energyDs thesis26END27Backup28 binding energy for 12C(e,eK+)12B

(FWHM: 500 keV)Present (2/28)30Gaussian fitting

Gaussian fit 8020 events (/10000)

~80% counting efficiencySIMULATION (after matrix tuning)12C, 87.5 mg/cm212B (-B=-11.37 MeV)[GeV][ Counts / 100 keV]31Number of events after matrix tuning

Counting efficiency is good enough !SIMULATION (after matrix tuning)12C, 87.5 mg/cm212B (-B=-11.37 MeV)32Voigt function

Systematic error for cross-section

34Carbon target

36Boron target

37Lithium target

38Chromium target

399Be(e,eK+)9Li

To be update(This is made by old matrix)40Differential cross section of 10B(*,K+)10Be

Peak-B [MeV]Number of eventCross section [nb/sr]1-8.66 0.081411211.6 0.92-7.81 0.235174.3 0.73-6.08 0.091391211.8 1.04-5.03 0.147896.5 0.75-1.98 0.101561313.0 0.96-0.11 0.161231110.0 0.872.23 0.071881415.9 1.1811 .14 0.1394 107.8 0.8( FWHM ~ 0.8 MeV )PREVIOUS (1/10)41Comparison with old data

MeVPREVIOUS (1/10)42Differential cross section of 10B(*,K+)10Be

Peak-B [MeV]Number of eventCross section [nb/sr]1-8.66 0.081411211.6 0.92-7.81 0.235174.3 0.73-6.08 0.091391211.8 1.04-5.03 0.147896.5 0.75-1.98 0.101561313.0 0.96-0.11 0.161231110.0 0.872.23 0.071881415.9 1.1811 .14 0.1394 107.8 0.8( FWHM ~ 0.8 MeV )

-8.84 without CSB-8.76 with CSBHiyamas calc.Motobas calc.PREVIOUS (1/10)43Contribution to missing mass resolution

One of results of blind analysesMissing masses with initial matricesSimply calculated by quadratic sum4445Differential cross section predicted by Motoba-san

Motoba-sans calc.12B g.s. (1- , 2-)LabK [degree] [nb/sr]47Angular distribution in simulation (LabK)

Accepted events by HES-HKS with uniform generationExpected distribution(Weighted by prediction)SIMULATIONMotoba-sans calc.12B g.s. (1- , 2-)LabK [degree]Normalized intensityLabK [degree][Counts]48

Predicted cross section in our acceptance

SIMULATIONSIMULATIONAccepted events by HES-HKS with uniform generationExpected distribution(Weighted by prediction)6.8 degree7.4 degreeMean values75 nb/sr75 nb/srLabK [degree] [nb/sr]Value usedfor comparison !!49Matrix optimization with 7HeToshi Gogami27Feb201450Histogram sample

7HeBackground7He + background51Results

# (Number of LOOPs)1 (10)2 (10)3 (5)4 (15)Angle ( : 0 : 7He )1:1:11:1:11:1:9-Momentum( : 0 : 12B)---1:1:17He convergence toFitting meanFixed (generated point)Fixed(generated point)-Width of 7He (FWHM)[keV/c2]1060 +/- 701030 +/- 70980 +/- 601030 +/- 70( Matrix tuning was started with not-distorted matrices.)#3#2#1#452Contribution to missing mass resolution

One of results of blind analysesMissing masses with initial matricesSimply calculated by quadratic sum53New blind analysis results

4Mar2014Toshi Gogami54Blind analysisDate: 2/25 3/4Time: 92.5 hoursInitial matrices: distorted by handMomentum: , 0 and 12BAngle : and 0

25Feb2014: mom (1:1:1) 3.5 hours26Feb2014: mom (1:1:1)27Feb2014: mom (1:1:1) 11hours28Feb2014: angle (1:1) 19 hours28Feb2014: mom (1:1:1) 7.5 hours1Mar2014: angle (1:1) 19 hours2Mar2014: mom(1:1:1) 11.5 hours3Mar2014: angle(1:1) 19 hours4Mar2014: mom (1:1:1) 12 hours

55Missing mass spectra with distorted matrices

07He52V12B10Be56Spectrum comparison

BeforeAfter57Results

FWHMFitting mean generated mass5859H2O target 16N

60Comparison with hall A data

61