Analysis Report Haiyun Lu.

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Presentation transcript:

Analysis Report Haiyun Lu

Outline Introduction Detector Motivation Work needs to be done Work already been done To do 11/11/2018

Introduction g D-> K+ S*-(p)‏ g D-> K+ L (n)‏ g D-> K0 L (p)‏ Common form: g N-> K Y 11/11/2018

Introduction II S*- 1385 MeV I=1 Jp=3/2+ dds 87% L p- full width:39.4 MeV L 1115.7 MeV I=0 Jp=1/2+ uds 64% p p- mean life τ = 2.631 × 10−10 s 11/11/2018

Jefferson Lab 11/11/2018

Detector 11/11/2018

Detector II 11/11/2018

Detector III 11/11/2018

Detector IV 11/11/2018

Detector V 11/11/2018

Accelerator 11/11/2018

Accelerator II 11/11/2018

Radiator and Tagger 11/11/2018

Motivation EG3 run Real photon beam: 1.15GeV – 5.5 GeV Target: Deuteron Trigger: three-sector triggering Advantage: neutron, high resonance state Disadvantage: few-particle final state 11/11/2018

Motivation II g D-> K+ S*-(p)‏ --->Lp- g D-> K0 L (p)‏ L->p p- g D-> K+ L (n) for normalization reference and other physics 11/11/2018

Physics Motivation Hyperon self-analyzing property N*->KY, search for “missing” states and KY coupling Y* spectrum, constraint on SU(3) of decuplet baryons KN coupling, comparison with pN YN Final state interaction 11/11/2018

World Data Ref. 1 PRL 102, 012501 (2009)‏ 11/11/2018

Self Analyzing 11/11/2018

Parity 11/11/2018

Polarization 11/11/2018

Polarization II 11/11/2018

Cross Section dN/dt=ls N=Ls s=N/L= Y: yield A: acceptance 11/11/2018

KS*- Final Particles: (P) (K+) P p- p- Middle-step particles: L 1.115MeV Final particle: S*- 1.385MeV 11/11/2018

Old Particle Identification GeV 11/11/2018 GeV

Particle Identification GeV 11/11/2018 GeV

Particle Identification II GeV 11/11/2018 GeV

L Reconstruction GeV GeV 11/11/2018

L Reconstruction II GeV GeV 11/11/2018

Sigma VS Missing Mass GeV GeV 11/11/2018

Sigma VS Missing Mass II GeV GeV 11/11/2018

Sigma Yield Fit 11/11/2018

Sigma Yield Fit II 11/11/2018

Yield 11/11/2018

Trigger Correction 11/11/2018

Trigger Correction II 11/11/2018

GFlux Normalization 11/11/2018

GFlux Normalization II 11/11/2018

KL Production Two cases: K+L: K+ pp- K0L: p+p- pp- 11/11/2018

K+L Production 11/11/2018

Fit and Yield 11/11/2018

Trigger & GFlux Correction 11/11/2018

K0L Production GeV GeV 11/11/2018

Fit and Yield 11/11/2018

Trigger & GFlux Correction 11/11/2018

Reference K. Hicks, etc. Phys. Rev. L 102, 012501 (2009)‏ Y. Oh, etc. Phys. Rev. C 77,045204 (2008)‏ M. Do¨ring, etc. Phys. Rev. C 73,045209 (2006)‏ 11/11/2018

K* 11/11/2018

Work need to be done Get yield, acceptance, correction factor Cuts: Timing cuts: vertex time cut, photon time cut, PID cut Channel cuts: missing mass cut, invariant mass cut, yield fit range cut Fiducial cuts: proton momentum cut, theta-phi cut for each particle, DC wire cut 11/11/2018

Work need to be done II Correction Factor: tagger efficiency correction, un/trigger correction 11/11/2018

To do Run simulation to get acceptance Steer the simulation to get correct t slope Check all cuts and correction factor by showing histograms before and after correction Compare simulation and data by showing pivot histograms Get Cross section Error propagation calculation 11/11/2018

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