HES-HKS & KaoS meetingToshi Gogami

8Nov2013

11/2 @ 秋保大滝

Contents

• Virtual photon flux– Collimator position– HES-HKS momentum matching

• Blind analysis

HES collimator

Seed : virtual photon associated

Virtual photon flux

Γ’ = 2.81E-5 +- 0.04E-5 [ /electron]

Γ’ = 4.33E-5 +- 0.05E-5 [ /electron]

Collimator position-7.7 cm

12C データは -7.7cm で取っていると思っていた が、

Hall-C logbook

User name kohlmLog entry time 10:45:17 on October 05, 2009Entry number 188508Followups:188532 10/05/09 13:27 Nue We changed collomator position to recover high P coin events in HESkeyword=HES collimator position change

Changed HES collimator position (~3cm down), after run 76072

From EPICS information

75813HES SS=-330mm75814HES SS=-330mm75815HES SS=-330mm75816HES SS=-330mm75817HES SS=-330mm・・・・

・・・76072HES SS=-330mm76073HES SS=-300.2mm76074HES SS=-330mm ?76075HES SS=-300.2mm76076HES SS=-300.2mm・・・

-7.7 cm

-4.7 cm

HES HKS matching

HES HKS matching

Σ0 Λ

12ΛB g.s. 52

ΛV g.s.

Different momentum region different angular region

Blind analysis(Σ0入れました )

1. Distorted2. Momentum tune [5 iteration, 5 loop]3. Momentum (0th ) + angle [5 iteration, 1loop]

Missing masses Λ

1

2

3

Momentum

1

2

3

x’ and y’

1

2

3

Summary

• Virtual photon flux – Collimator position , matching

• Blind analysis– In progress

Outlook• Matrix tuning– A=52

• Formation cross section– ひとまず出す (次回 )

• Binding energy– Fitting (12

ΛB, 10ΛB, 7

ΛLi 次回 )

• Blind analysis– Matrix distortion– Seed generation

• Hypernuclei• Background

• Radiation tail – Ask Miss. Fujita

Backup

HES acceptance