S-2S meetingToshi Gogami17July2014

Contents

Missing mass correction by the information of energy loss in the target

Simulation setup

K+

K-

CH2 target 4.65/9.30 [g/cm2]

Production points were randomly moved

Summary of the last week discussion

Missing mass resolution of 12ΞBe

FWHM = 2.6 MeV with 4.65 g/cm2 CH2 target FWHM = 3.7 MeV with 9.3 g/cm2 CH2 target

Assumed momentum resolution ( in FWHM)Incident K-: K+:

Missing mass vs. Energy loss in the target (9.3 g/cm2 CH2

)

Ener

gy L

osse

s of

K- a

nd K

+ [M

eV]

Ener

gy L

osse

s of

K- a

nd K

+ [M

eV]

Fitting with a linear function(test)

Before correction After correction

[Cou

nts

/ 0.

4 M

eV]

[Cou

nts

/ 0.

4 M

eV]

-BΞ + 4.5[MeV] -BΞ + 4.5[MeV]

SIMULATION SIMULATION

SIMULATION SIMULATION

FWHM ~ 4.0 MeV FWHM ~ 1.9 MeV

Missing mass vs. Energy loss in the target (4.65 g/cm2 CH2

)

Ener

gy L

osse

s of

K- a

nd K

+ [M

eV]

Ener

gy L

osse

s of

K- a

nd K

+ [M

eV]

Fitting with a linear function(test)

Before correction After correction

[Cou

nts

/ 0.

4 M

eV]

[Cou

nts

/ 0.

4 M

eV]

-BΞ + 4.5[MeV] -BΞ + 4.5[MeV]

SIMULATION SIMULATION

SIMULATION SIMULATION

FWHM ~ 2.8 MeV FWHM ~ 2.1 MeV

Summary

うまく、エネルギーロスを用いた補正をかければFWHM = 2.0 MeV 程度は達成できる。

The natural width was not taken into account.dE resolution was not considered.Effect of the inverse transfer matrix is zero.Assumed momentum resolution ( in FWHM)

Incident K-: K+: