γ+ d → p + p + π- Analysis

Y.C.Han@NKS2 Meeting

Jan10, 2008

Contents

• Energy deposit Correction

• Select/Cut Conditions

Energy Deposit Correction

• Motivation: get more accurate kinematics

• p/pi energy loss in IH

for proton, 0.5~6 for pion

Energy deposit correction

Event Select with loose cut

Particle E/p from DC

Energy deposit Correction

Event Select with tight cut

Analysis W/ Correction

Energy Deposit Correction Method

Event Select

Event Select

Event Select

Event Select

Appendix-3

Event Select Condition• Time: |IH-TagF| <2.5nsec;• 2TrVertex: Track Distance<1.5 cm;• 3TrVertex: Triangle length<3.0 cm;• 3TrVerPos: -3<X<2, -1.64<Y<1.44, -1<Z<1 (cm); • Mass: 0.8<ppiMM <1.17, 1.66<LVTarM<2.1 (GeV/c2);• LVTarMom: 119.6<Px<80.4, -103.7<Py<96.3, -50<Px<50

(MeV/c);

Appendix-2

Fig. Effect of Energy Deposit

Appendix-3

Simulation SetGENETYPE: 3BPS pp- /4BPS pp-0

Gamma E:0.8~1.1 GeV (uniform); Beam Size: YZ-Plane Gaussian distribution w/ σ=0.5 cm; Target: LD2 w/ -3.61<X<0.39 cm Event #:1e6;SDCRES: 150μm ;CDCRES: 200μm ;HDTRES: 0.2 cm;OHZRES: 2.0 cm;DCEFF: 99%;DCEFFREG: 1.2;

Appendix-4

Material Depth (cm) Density （ g/cm3 ）

Target Liquid D2 Φ4.8×3.3 0.17

Target Cell Film Upilex-S 75×2e-4 1.47

Super-Insulator Aluminized Mylar 50e-4×2 1.39

Mylar 6e-4×15(?) 1.39

Target Out Cell Wall CFRP 0.15 1.55

IH Polyvinyltolunene 0.5 1.03

SDC Window Mylar 200×2e-4 1.39

Straw Cell Aluminized Mylar 30×6e-4 1.39

SDC Gas Ar+Ethane(50:50) 4.5 1.57e-3

CDC inner Window CFRP 500e-4 1.55

Total Normal to IH material

1.17 1.03

TABLE I . Materials of NKS2 on the Particles’ Trajectory (inside CDC)

That’s All.