Calo Prediction Trial

Nagoya UniversityF - LAB

Kunihiro Morishima

X

Y

Method

not real scale

emulsion target + SFT EMcal

νbeam

U

V SFT hit information cluster position information

1. predict the CS scanning area (5mm×5mm) by using Fiber hit information2. predict the angle by connecting line between CS scanning position and cluster position in EMcal

Make prediction by using highest energy cluster position at EMcal

highest energy cluster

Position information from Bruce

prediction track

7m

Position Prediction

line by hand

U projection

5mm

3026_23438

CS scanning area 5mm×5mm

Position Prediction

V projection

5mm

3026_23438

Angle Prediction

U EMcal

V EMcal

1

2-1 -1 1 1

X EMcal

Y EMcal

1. cluster position coordinate transformation from (X,Y) to (U,V)

2. calculate angle

U EMcal – U SFT

LV EMcal – V SFT

L

θu ＝

θv ＝

L = distance 　　　 between CS and Emcal

position resolution CS ±2.5mm EMcal 　 ±75mm (2.5+75) /7000 ～ 11mrad

Effect of magnet

emulsion target + SFT

EMcalmagnet

Pt ～ 225 MeVνbeam

@10 GeV 22.5 mrad@50 GeV 4.5 mrad

7m

δθ

δθ

Scanning

Position ± 2.5mmAngle ± 15mrad

CS scan prediction allowance

Bulk scan

Net Scan Back Location

SS scan

Result

Event ID E cluster (GeV)

locatedor not

comment

3118_26855 20.3 ○ electron shower

3113_07743 51.4 ○ electron shower

3026_23438 7.6 ○ electron shower

3113_17361 66.4 × SS broken

3008_17248 24.3 × bad alignment ( high density ～ 2×10^5/cm^2)

Tried 5 event , located 3 event

If data quality is good, this method is effective

3118_26855

3113_07743

3026_23438