rts t tsr r - - PowerPoint PPT Presentation

❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥

❇✉❞❦❡r ■♥st✐t✉t❡ ❢♦r ◆✉❝❧❡❛r P❤②s✐❝s✱ ◆♦✈♦s✐❜✐rs❦✱ ❘✉ss✐❛

❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ■♥tr♦❞✉❝t✐♦♥ ❊❧❛st✐❝ ✭❡ ❞✮ ✕ s❝❛tt❡r✐♥❣ ✭✷✵✵✸✮ ❚✇♦✲❜♦❞② ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥ ✭✷✵✵✼✱ ♥❡✇ ♣❧❛♥s✮ ❈♦❤❡r❡♥t ♣✐♦♥ ♣❤♦t♦♣r♦❞✉❝t✐♦♥ ♦♥ t❤❡ ❞❡✉t❡r♦♥ ✭✷✵✵✾✱ r❡s❡♥t ♠❡❛s✉r❡♠❡♥ts✮ ❈♦♥❝❧✉s✐♦♥

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶

■♥tr♦❞✉❝t✐♦♥

■♥✈❡st✐❣❛t✐♦♥ ♦❢ t❤❡ ❞❡✉t❡r♦♥ ✐♥ ❡❧❡❝tr♦♠❛❣♥❡t✐❝ ♣r♦❝❡ss❡s ♣❧❛②s ❛ s♣❡❝✐❛❧ r♦❧❡ ✐♥ ♥✉❝❧❡❛r ♣❤②s✐❝s✳ ❚❤✐s ✐s ❞✉❡ t♦ t❤❡ ❢❛❝t t❤❛t✱ ♦♥ t❤❡ ♦♥❡ ❤❛♥❞✱ ♦❢ ❛❧❧ ♥✉❝❧❡❛r s②st❡♠s t❤❡ ❞❡✉t❡r♦♥ ✐s s✐♠♣❧❡st ❛♥❞ ♠♦st r❡❧✐❛❜❧② ❝❛❧❝✉❧❛t❡❞ ❛♥❞✱ ♦♥ t❤❡ ♦t❤❡r ❤❛♥❞✱ t❤❡ ❡❧❡❝tr♦♠❛❣♥❡t✐❝ ✐♥t❡r❛❝t✐♦♥ ✐s ✇❡❧❧ ✉♥❞❡rst♦♦❞✳ ❚❤❡ st✉❞② ♦❢ ❞❡✉t❡r♦♥ ❤❛s ❧❡❞ t♦ t❤❡ ♠❛♥✐❢❡st❛t✐♦♥ ♦❢ ♠❡s♦♥ ❛♥❞ ✐s♦❜❛r ❞❡❣r❡❡s ♦❢ ❢r❡❡❞♦♠ ✐♥ t❤❡ ❞❡✉t❡r♦♥✳ ❋✉rt❤❡r ✐♥✈❡st✐❣❛t✐♦♥s ♦❢ ❞❡✉t❡r♦♥ ❛❧❧♦✇ t♦ ♦❜t❛✐♥ ❛❞❞✐t✐♦♥❛❧ ✐♥❢♦r♠❛t✐♦♥ ♦♥ t❤❡ ◆✲◆ ✐♥t❡r❛❝t✐♦♥ ❛♥❞ t♦ ❝❤❡❝❦ t❤❡ r♦❧❡ ♦❢ r❡❧❛t✐✈✐st✐❝ ❛♥❞ q✉❛r❦✲❣❧✉♦♥ ❡✛❡❝ts ✐♥ ♥✉❝❧❡✐✳ ❆❧s♦ t❤❡ ❞❡✉t❡r♦♥ ✐s t❤❡ ❜❡st ♥❡✉tr♦♥ t❛r❣❡t✳ ❍❡❛✈② ❤②❞r♦❣❡♥ ✇❛s ❝❤♦s❡♥ ❛s t❤❡ ❡❧❡♠❡♥t ✜rst t♦ ❜❡ ❡①❛♠✐♥❡❞✱ ❜❡❝❛✉s❡ t❤❡ ❞✐♣❧♦♥ ✐s t❤❡ s✐♠♣❧❡st ♦❢ ❛❧❧ ♥✉❝❧❡❛r s②st❡♠s ❛♥❞ ✐ts ♣r♦♣❡rt✐❡s ❛r❡ ❛s ✐♠♣♦rt❛♥t ✐♥ ♥✉❝❧❡❛r t❤❡♦r② ❛s t❤❡ ❤②❞r♦❣❡♥ ✐s ✐♥ ❛t♦♠✐❝ t❤❡♦r②✳ ❏✳ ❈❤❛❞✇✐❝❦ ❛♥❞ ▼✳ ●♦❧❞❤❛❜❡r✱ ◆❛t✉r❡ ✶✸✹✭✶✾✸✹✮✷✸✼✳ ❆❧r❡❛❞② ✐♥ t❤❡ ❡❛r❧② st❛❣❡s ♦❢ r❡s❡❛r❝❤ ♦❢ t❤❡ ❞❡✉t❡r♦♥ ✐t ❜❡❝❛♠❡ ❝❧❡❛r✱ t❤❛t t❤❡ t❡♥s♦r ❝♦♠♣♦♥❡♥ts ♦❢ t❤❡ ♥✉❝❧❡♦♥✲♥✉❝❧❡♦♥ ✐♥t❡r❛❝t✐♦♥ ♣❧❛②s t❤❡ ✐♠♣♦rt❛♥t r♦❧❡✱ ❜✉t t❤❡ ♦♣♣♦rt✉♥✐t② t♦ st✉❞② ♦❢ t❤❡ t❡♥s♦r ❡✛❡❝ts ❛♣♣❡❛r❡❞ ♦♥❧② r❡❝❡♥t❧② ✇✐t❤ t❤❡ ❞❡✈❡❧♦♣♠❡♥t ♦❢ t❡❝❤♥♦❧♦❣② ♣♦❧❛r✐③❛t✐♦♥ ❡①♣❡r✐♠❡♥ts✳ ❚❤❡ ❞❡✈❡❧♦♣♠❡♥t ♦❢ ✐♥t❡r♥❛❧ t❛r❣❡ts ♠❡t❤♦❞ ✐♥ st♦r❛❣❡ r✐♥❣s ♣r♦✈❡❞ ♣r♦❞✉❝t✐✈❡ ❢♦r t❤❡ r❡s❡❛r❝❤❡s ♦❢ ❞❡✉t❡r♦♥✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷

■♥tr♦❞✉❝t✐♦♥✳ ▼❡t❤♦❞ ♦❢ t❤❡ ■♥t❡r♥❛❧ ❚❛r❣❡t

❝♦♥❝❡♣t✐♦♥ ✕ ✐♥ ❇■◆P ✜rst ✉s❡ ✕ ✐♥ ❇■◆P✿ ❱❊P✕✶✱ ❱❊PP✕✷✱ ❱❊PP✕✸ ❧❛t❡r ✕ ✐♥ ♠❛♥② ▲❛❜♦r❛t♦r✐❡s✿

❡❧❡❝tr♦♥ st♦r❛❣❡ r✐♥❣s✿ ◆■❑❍❊❋✱ ❇❛t❡s✱ ❍❊❘❆ ✳ ✳ ✳ ✐♦♥ r✐♥❣s✿ ■❯❈❋✱ ❈❊▲❈■❯❙✱ ❈❖❙❨ ✳ ✳ ✳

❛❧❧♦✇s t♦ ✐♥❝r❡❛s❡ s✉❜st❛♥t✐❛❧❧② t❤❡ ❡✣❝✐❡♥❝② ♦❢ ✉t✐❧✐③❛t✐♦♥ ♦❢ t❛r❣❡t ♠❛t❡r✐❛❧ ❛♥❞ ❜❡❛♠ ♣❛rt✐❝❧❡s✱ t❤✉s ♠❛❦✐♥❣ ❢❡❛s✐❜❧❡ ♠❡❛s✉r❡♠❡♥ts✿

✇✐t❤ ❡①♦t✐❝ t❛r❣❡ts✿ ♣♦❧❛r✐③❡❞ ♦♥❡s❀ ♦❢ r❛r❡✲✐s♦t♦♣❡s✱ ❡t❝✳ ✇✐t❤ ❡①♦t✐❝ ❜❡❛♠s✿ ♣♦s✐tr♦♥s✱ ❛♥t✐♣r♦t♦♥s✱ ✐♦♥s ♦❢ r❛r❡ ✐s♦t♦♣❡s ❡t❝✳ ✇✐t❤ s❧♦✇ ♦r ❤❡❛✈② ♦r str♦♥❣✲✐♦♥✐③✐♥❣ r❡❛❝t✐♦♥ ♣r♦❞✉❝ts✳

r❡✈✐❡✇ ♦❢ t❤❡ ♠❡t❤♦❞✿ ❙✳●✳ P♦♣♦✈✱ ■♥t❡r♥❛❧ t❛r❣❡ts ✐♥ st♦r❛❣❡ r✐♥❣s ♦❢ ❝❤❛r❣❡❞ ♣❛rt✐❝❧❡s✱ ❨❛❞✳❋✐③✳ ✻✷✭✶✾✾✾✮✷✾✶

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✸

❇■◆P ❆t♦♠✐❝ ❇❡❛♠ ❙♦✉r❝❡

Me Md +1/2 +1 n1 n1 +1/2 n2 n2 n1 n1 n1 +1/2

• 1

n3 S1-S3 n3 MFT n2 S4,S5 n2 SFT n2

• 1/2
• 1

n4 n3

• 1/2

n5 n2

• 1/2

+1 n6 0 , n1

✲ ✲ ✲ ✲

ТМН

жидкий азот

криостат

с жидким гелием

sc

D

P

zz

P

zz +

Liquid Helium

TMP

P③ = ♥+ − ♥− ✕ ❞❡❣r❡❡ ♦❢ t❛r❣❡t ✈❡❝t♦r ♣♦❧❛r✐③❛t✐♦♥✿ −✶ . . .+✶ P③③= ✶ − ✸ · ♥✵ ✕ ❞❡❣r❡❡ ♦❢ t❛r❣❡t t❡♥s♦r ♣♦❧❛r✐③❛t✐♦♥✿ −✷ . . .+✶ ♥+, ♥−, ♥✵ ✕ ♣♦♣✉❧❛t✐♦♥

♥✉♠❜❡rs ❢♦r s♣✐♥ ♣r♦❥❡❝t✐♦♥s +✶✱ −✶ ❛♥❞ ✵✱ r❡s♣❡❝t✐✈❡❧②✳

✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳✳ ❋❧✉① ♦❢ ❞❡✉t❡r✐✉♠ ❛t♦♠s ✽ · ✶✵✶✻ ❛t✴s❡❝ P③③ > ✾✽✪ P③ < ✷✪

❙✉r❢❛❝❡ ♦❢ ❝♦♥st❛♥t ❞❡♥s✐t② ρ = ✵.✷✹❢♠−✸ ✐♥ ❞❡✉t❡r♦♥

P

zz = -2

P

zz = +1 H ❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✹

❙t♦r❛❣❡ ❈❡❧❧

To BRP Liquid Nitrogen 13mm 40 cm 24mm From ABS covered by drifilm µ 30 m-thick aluminum foil

e-beam

• ❛✐♥ ♦✈❡r ❛ ❥❡t t❛r❣❡t✿

❑ = ✶.✶(▲/✷)✷ ❉✷ s ❚❥❡t ❚❝❡❧❧ ❢♦r ♦✉r ❝❡❧❧ ❑ ≈ ✻✺ ◆❡✇ ♣r♦❜❧❡♠s✿ ❞❡♣♦❧❛r✐③❛t✐♦♥ ✐♥ ❛t♦♠✲✇❛❧❧ ❝♦❧❧✐s✐♦♥s ❞❡♣♦❧❛r✐③❛t✐♦♥ ❜② ♠❛❣✳ ✜❡❧❞ ♦❢ ❡✲❜❡❛♠ ❛♣❡rt✉r❡ ❧✐♠✐t❛t✐♦♥ ❙♦❧✉t✐♦♥s✿ s♣❡❝✐❛❧ ✇❛❧❧ ❝♦❛t✐♥❣ ✕ ❞r✐✜❧♠ ♠❛❣✳ ✜❡❧❞ str❡♥❣t❤ >> ❍❝ = ✶✶✼ ●s ❧♦❝❛❧ ♠♦❞✐✜❝❛t✐♦♥ ♦❢ ❱❊PP✕✸ ❜❡❛♠ ♦♣t✐❝s

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✺

❱❊PP✕✸

❱❊PP✕✸ ♣❛r❛♠❡t❡rs ❊❧❡❝tr♦♥ ❡♥❡r❣② ❊✵ ✷ ●❡❱ ▼❡❛♥ ❜❡❛♠ ❝✉rr❡♥t ■✵ ✶✺✵ ♠❆ ❊♥❡r❣② s♣r❡❛❞ ∆❊/❊ ✵✳✵✺✪ ❘❋ ❍❱ ♠❛❣♥✐t✉❞❡ ❯✼✷ ✵✳✽ ▼❱ r❡✈♦❧✉t✐♦♥ ♣❡r✐♦❞ ❚ ✷✹✽✳✶✹ ♥s ❜✉♥❝❤ ❧❡♥❣t❤ σ▲ ✶✺ ❝♠ ✈❡rt✐❝❛❧ ❜❡❛♠ s✐③❡∗ σ③ ✵✳✺ ♠♠ ❤♦r✐③♦♥t❛❧ ❜❡❛♠ s✐③❡∗ σ① ✷✳✵ ♠♠ ✈❡rt✳ β✲❢✉♥❝t✐♦♥∗ β③ ✷ ♠ ❤♦r✐③✳ β✲❢✉♥❝t✐♦♥∗ β① ✻ ♠ ■♥❥❡❝t✐♦♥ ❜❡❛♠ ❡♥❡r❣②❊✐♥❥ ✸✺✵ ▼❡❱ ■♥❥❡❝t✐♦♥ r❛t❡ ˙ ■✐♥❥ ✶✳✺·✶✵✾ s−✶

∗ ♣❛r❛♠❡t❡rs ✐♥ t❤❡ ❝❡♥t❡r ♦❢ ✷♥❞ str❛✐❣❤t s❡❝t✐♦♥

s❤✐❢t ❣r❛♣❤ ✭❜❡❛♠ ❝✉rr❡♥t ✈s✳ t✐♠❡✮

Internal Target Area

VEPP-3

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✻

❊❧❛st✐❝ ✭❡❞✮ ✕ s❝❛tt❡r✐♥❣

❆ss✉♠✐♥❣ P✲ ❛♥❞ ❚✲✐♥✈❛r✐❛♥❝❡ ❛♥ ❡❧❡❝tr♦♠❛❣♥❡t✐❝ str✉❝t✉r❡ ♦❢ t❤❡ ❞❡✉t❡r♦♥ ✐s ❝♦♠♣❧❡t❡❧② ❞❡s❝r✐❜❡❞ ❜② t❤❡ t❤r❡❡ ❢♦r♠ ❢❛❝t♦rs✿ ❝❤❛r❣❡ ♠♦♥♦♣♦❧❡ ●❈(◗✷)✱ ❝❤❛r❣❡ q✉❛❞r✉♣♦❧❡ ●◗(◗✷) ❛♥❞ ♠❛❣♥❡t✐❝ ❞✐♣♦❧❡ ●▼(◗✷)✳ ❚✇♦ ❞❡✉t❡r♦♥ str✉❝t✉r❡ ❢✉♥❝t✐♦♥s ❆(◗✷) = ● ✷

❈ + (✽/✾)η✷ ● ✷ ◗ + (✷/✸)η ● ✷ ▼ ❛♥❞ ❇(◗✷) = (✹/✸)η ● ✷ ▼ ✭❤❡r❡

η = ◗✷/✹▼✷

❞✱ ▼❞ ✐s ❞❡✉t❡r✐✉♠ ♠❛ss✮ ❝♦✉❧❞ ❜❡ ❞❡r✐✈❡❞ t❤r♦✉❣❤ t❤❡ ♠❡❛s✉r❡♠❡♥ts

♦❢ s♣✐♥✲❛✈❡r❛❣❡ ❡❧❛st✐❝ ❡❧❡❝tr♦♥✲❞❡✉t❡r♦♥ s❝❛tt❡r✐♥❣ ❝r♦ss s❡❝t✐♦♥✿ σ✵ = σ▼♦tt(❆ + t❛♥✷(θ❡/✷) ❇)✳ ❋♦r♠ ❢❛❝t♦rs ●❈ ❛♥❞ ●◗ ❝❛♥ ❜❡ ❞❡t❡r♠✐♥❡❞ s❡♣❛r❛t❡❧② ♦♥❧② t❤r♦✉❣❤ t❤❡ ❛❞❞✐t✐♦♥❛❧ ♠❡❛s✉r❡♠❡♥t ♦❢ t❤❡ ♣♦❧❛r✐③❛t✐♦♥ ♦❜s❡r✈❛❜❧❡✳ ❚❤❡ ❝r♦ss s❡❝t✐♦♥ ✇✐t❤ t❡♥s♦r✲♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❝❛♥ ❜❡ ✇r✐tt❡♥ ❛s σ = σ✵ [✶ + ✶ √ ✷ P③③(✸ ❝♦s✷ θ∗ − ✶ ✷ ❚✷✵− −

• ✸

✽ s✐♥ ✷θ∗ ❝♦s φ∗ ❚✷✶ +

• ✸

✽ s✐♥✷ θ∗ ❝♦s ✷φ∗ ❚✷✷)] ✭✶✮ ❚❡♥s♦r ❛♥❛❧②③✐♥❣ ♣♦✇❡r ❝♦♠♣♦♥❡♥ts ❝❛♥ ❜❡ ❡①♣r❡ss❡❞ ❛s ❚✷✵ = −(η/✸) √ ✷ (✹ ●❈●◗ + ✹/✸ η ● ✷

◗ + (✶/✷ + ε) ● ✷ ♠) /❙;

❚✷✶ = ✷

• η✸(✶ + ε)/✸ ●◗●▼ /❙; ❚✷✷ = η/(✷

√ ✸) ● ✷

▼ /❙

✭✷✮ ✇❤❡r❡ ε = (✶ + η)t❣ ✷(θ❡/✷)✱ ❙ ≡ (❆ + t❛♥✷(θ❡/✷) ❇)✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✼

❉❡t❡❝t♦r ❡❧❛st✐❝ ✭❡❞✮✲s❝❛tt❡r✐♥❣

X Z Y

CsI

storage cell

NaI

θ θ φ

hadron arm #2

vertex chambers scintillators drift chambers

electron arm #1 electron arm #2 hadron arm #1 2 GeV electrons H

φ LQP arm

❙❝❤❡♠❛t✐❝ ✈✐❡✇ ♦❢ t❤❡ ❞❡t❡❝t♦r ♦❢ ❡❧❛st✐❝ ✭❡ ❞✮✲s❝❛tt❡r✐♥❣

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✽

❘❡s✉❧ts ♦❢ ❡❧❛st✐❝ ✭❡❞✮✲s❝❛tt❡r✐♥❣

Q2, fm-2

GC

• 0.01

0.01 0.02 0.03 0.04 0.05 10 15 20 25

Q2, fm-2

GQ

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 2 10 15 20 25

Q2, fm-2 T21(70o)

• 0.2

0.2 0.4 0.6 0.8 1 1.2 1.4 20 40

Bates (1984) [ 7 ] VEPP-2 (1985) [ 10 ] VEPP-3 (1990) [ 11 ] Bates (1994) [ 8 ] NIKHEF (1996) [ 12 ] NIKHEF (1999) [ 13 ] TJNAF (2000) [ 9 ] This experiment

T20(70o) Q2, fm-2

• 1.5
• 1
• 0.5

0.5 1 10 20 30 40 50

❘❡s✉❧ts ♦❢ ❡❧❛st✐❝ ✭❡ ❞✮✲s❝❛tt❡r✐♥❣✳ ❚❤❡ t❡♥s♦r ❛♥❛❧②③✐♥❣ ♣♦✇❡r ❝♦♠♣♦♥❡♥ts ❚✷✵ ❛♥❞ ❚✷✶ ❤❛✈❡ ❜❡❡♥ ♠❡❛s✉r❡❞ ❛t ♠♦♠❡♥t✉♠ tr❛♥s❢❡r ✽.✹ − ✷✶.✻❢♠−✷✳ ❖✉r r❡s✉❧ts ❞♦♥✬t ❝♦♥tr❛❞✐❝t t❤❡ ♣r❡✈✐♦✉s ♠❡❛s✉r❡♠❡♥ts✳ ■♥ t❤❡ r❡❣✐♦♥ ✽ − ✶✷❢♠−✷ ♥❡✇ r❡s✉❧ts s✐❣♥✐✜❝❛♥t❧② ✐♠♣r♦✈❡ t❤❡ ❛❝❝✉r❛❝② ❢♦r ❚✷✵ ❛♥❞ ❚✷✶✳ ❉❡✉t❡r♦♥ ❝❤❛r❣❡ ❢♦r♠ ❢❛❝t♦rs ●❈ ❛♥❞ ●◗ ❛r❡ ❡①tr❛❝t❡❞ ❢r♦♠ t❤❡ ♦❜t❛✐♥❡❞ ❞❛t❛ ❛♥❞ ❆✱ ❇ ❞❛t❛ ✐♥ ✐♠♣♦rt❛♥t r❛♥❣❡ ♦❢ ♠♦♠❡♥t✉♠ tr❛♥s❢❡r ✇❤❡r❡ t❤❡ ✜rst ♥♦❞❡ ♦❢ ♠♦♥♦♣♦❧❡ ❢♦r♠ ❢❛❝t♦r ✐s ❧♦❝❛t❡❞ ✭●❈ ♥✉❞❡ ❢♦✉♥❞ ❛s ✶✼.✹✶ ± ✵.✸✷❢♠−✷✮ ✳ ❈♦♠♣❛r✐s♦♥ ✇✐t❤ s❡✈❡r❛❧ t❤❡♦r❡t✐❝❛❧ ♣r❡❞✐❝t✐♦♥s s❤♦✇s s♦♠❡ ❛❞✈❛♥t❛❣❡ ♦❢ r❡❧❛t✐✈✐st✐❝ ❝❛❧❝✉❧❛t✐♦♥s ✐♥ ❣❡♥❡r❛❧✳ ❉✳▼✳ ◆✐❦♦❧❡♥❦♦✱ ❍✳ ❆r❡♥❤ö✈❡❧✱ ▲✳▼✳ ❇❛r❦♦✈ ❡t ❛❧✳✱ P❤②s✳ ❘❡✈✳ ▲❡tt✳ ✾✵✱ ✵✼✷✺✵✶ ✭✷✵✵✸✮✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✾

❲♦r❧❞ ❞❛t❛ ❢♦r ❡❧❛st✐❝ ✭❡❞✮✲s❝❛tt❡r✐♥❣ ❢♦r t♦❞❛②

❈✳ ❩❤❛♥❣ ❡t ❛❧✳ P❤②s✳ ❘❡✈✳ ▲❡tt✳ ✶✵✼✱ ✷✺✷✺✵✶ ✭✷✵✶✶✮

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✵

❚✇♦✲❜♦❞② ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥

t✇♦✲❜♦❞② ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥

☛ ✡ ✟ ✠

γ + ❞ → ♣ + ♥

d γ p n ❚✲♠❛tr✐①✿ ♥ = ✷ × ✸ × ✷ × ✷ = ✷✹

P❈

− − → ✶✷ ❝♦♠♣❧❡① ❛♠♣❧✐t✉❞❡s❀ ✐♥ t♦t❛❧ ✷♥✷ = ✷✽✽ ✈❛r✐♦✉s ♦❜s❡r✈❛❜❧❡s✱ ❜✉t ♦♥❧② ✷♥ − ✶ = ✷✸ ❛r❡ ✐♥❞❡♣❡♥❞❡♥t ❛♥② s✉❝❤ ✏s❡t✲♦❢✲✷✸✑ ♠✉st ✐♥❝❧✉❞❡ t❡♥s♦r ❛s②♠♠❡tr✐❡s✳ ❈r♦ss s❡❝t✐♦♥ ✐♥ ❝❛s❡ ♦❢ ♣♦❧❛r✐③❡❞ s♣✐♥✲✶ t❛r❣❡t ❛♥❞ ✉♥♣♦❧❛r✐③❡❞ ♣❤♦t♦♥ ❜❡❛♠✿ ❞σ ❞Ω = ❞σ✵ ❞Ω ( ✶ − r ✸ ✹ P❩ s✐♥ θ❍ s✐♥ φ❍ · ❚✶✶(❊γ, θ❈▼

♣

) + r ✶ ✷ P❩❩ »✸ ❝♦s✷ θ❍ − ✶ ✷ · ❚✷✵(❊γ, θ❈▼

♣

) − r ✸ ✽ s✐♥ ✷θ❍ ❝♦s φ❍ · ❚✷✶(❊γ, θ❈▼

♣

) + r ✸ ✽ s✐♥✷ θ❍ ❝♦s ✷φ❍ · ❚✷✷(❊γ, θ❈▼

♣

) #)

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✶

❉❡t❡❝t♦r ▲❛②♦✉t

• ✷ ♣❛✐rs ♦❢ ❛r♠s ✐♥ ✈❡rt✐❝❛❧

♣❧❛♥❡✿ ❛r♠ ■ ■■ θ♣ ✷✵◦✲✹✵◦ ✺✺◦✲✾✺◦ θ♥ ✶✷✼◦✲✶✹✺◦ ✻✽◦✲✾✷◦ ∆φ ✷✺◦ ✶✾◦

• ♣r♦t♦♥ ❛r♠✿

❞r✐❢t ❝❤❛♠❜❡rs + ✸ s❝✐♥t✐❧❧❛t♦r ❧❛②❡rs

• ♥❡✉tr♦♥ ❛r♠✿

t❤✐♥ ✈❡t♦✲❝♦✉♥t❡r + t❤✐❝❦ s❝✐♥t✐❧❧❛t♦r Neutron arm #1 e Neutron arm #2

veto counters

e-arm of LQ-polarimeter

storage cell vertex chamber drift chamber DC2 scintillator 23.5x50x2 cm scintillator 27.5x50x12 cm scintillator 35x50x12 cm

drift chamber DC1

Proton arm #2 Proton arm #1

3 3 3 ❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✷

❙❡♣❛r❛t✐♦♥ ♦❢ ❚✷▼

❚❡♥s♦r ❛s②♠♠❡tr②✿

❛❚ = √ ✷

σ+−σ− P+

③③σ−−P− ③③σ+ → ❝✵❚✷✵ + ❝✶❚✷✶ + ❝✷❚✷✷

❝✵ (θ❍, φ❍), ❝✶ (θ❍, φ❍), ❝✷ (θ❍, φ❍)

• 1
• 0.75
• 0.5
• 0.25

0.25 0.5 0.75 1 0o 30o 60o 90o 120o 150o 180o

θH φH

• 1
• 0.75
• 0.5
• 0.25

0.25 0.5 0.75 1 0o 45o 90o 135o 180o 225o 270o 315o 360o

❱❊PP✕✸ ✭✷✵✵✸✮ φ❍ = ✶✽✵◦θ❍ = ✶✽✵◦ ❛✵ ∼ ❝✵❚✷✵ θ❍ = ✺✹.✼◦ ❛✶ ∼ +❝✶❚✷✶ + ❝✷❚✷✷ θ❍ = ✶✷✺.✸◦ ❛✷ ∼ −❝✶❚✷✶ + ❝✷❚✷✷ → ❚✷✵ ∼ ❛✵ ❚✷✶ ∼ ❛✶ − ❛✷ ❚✷✷ ∼ ❛✶ + ❛✷ r❡❣✐♠❡ ✵ r❡❣✐♠❡ ✶ r❡❣✐♠❡ ✷

kγ H kγ

54.7o

H kγ

125.3 o

H

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✸

❘❡s✉❧ts✿ ❛s ❛ ❢✉♥❝t✐♦♥ ♦❢ ❊γ

• 1
• 0.75
• 0.5
• 0.25
• 0.5

0.5 1

T20 θcm = 24o - 48o θP T21 Eγ, MeV T22

• 0.5

0.5 100 200 300 400 500 600 0.2 0.4 0.6 0.8 1 0.2 0.4 0.6 0.8

T20 θcm = 70o - 102o θP T21 Eγ, MeV T22

• 1.5
• 1
• 0.5

100 200 300 400 500 600

✈❡rt✐❝❛❧ ❜❛rs ✕ st❛t✐st✐❝ ❡rr♦rs ❤♦r✐③♦♥t❛❧ ❜❛rs ✕ ❜✐♥ s✐③❡s s❤❛❞❡❞ ❜❛♥❞s ✕ s②st❡♠❛t✐❝ ❡rr♦rs

❚❤❡♦r❡t✐❝❛❧ ❝✉r✈❡s✿

s♦❧✐❞ ✕ ❑✳✲▼✳❙❝❤♠✐tt✫❍✳❆r❡♥❤ö✈❡❧ ✭✶✾✾✵✮✱ ❢✉❧❧ ❝❛❧❝✉❧❛t✐♦♥❀ ❞♦tt❡❞ ✕ ▼✳▲❡✈❝❤✉❦ ✭✶✾✾✺✮✱ ❢✉❧❧ ❝❛❧❝✉❧❛t✐♦♥❀ ❞❛s❤❡❞ ✕ ▼✳❙❝❤✇❛♠❜ ✭✷✵✵✻✮✳

■✳❆✳ ❘❛❝❤❡❦ ❡t ❛❧✳✱ P❤②s✳❘❡✈✳▲❡tt ✾✽ ✭✷✵✵✼✮✶✽✷✸✵✸

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✹

■♥❣r❡❞✐❡♥ts ♦❢ t❤❡ ♠♦❞❡❧✿ ❢r♦♠ ▼✳▲❡✈❝❤✉❦

▼✳■✳ ▲❡✈❝❤✉❦✱ ❋❡✇ ❇♦❞② ❙②st✳✱ ✶✾✭✶✾✾✺✮✼✼

c a b d

PWIA FSI MEC FSI MEC

Eγ MeV T20 θcm = 70o - 102o θP

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 20 40 60 80 100 120 140 160 180

Eγ MeV T21 θcm = 24o - 48o θP

• 0.2

0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 20 40 60 80 100 120 140 160 180

Eγ MeV T22 θcm = 70o - 102o θP

• 2
• 1.75
• 1.5
• 1.25
• 1
• 0.75
• 0.5
• 0.25

0.25 0.5 20 40 60 80 100 120 140 160 180

(a+b) (a) (a+b+c+d)

Plane Wave Impulse Approximation PWIA+ Final State Interaction PWIA+FSI+ Meson Exchange Currents

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✺

❘❡s✉❧ts ♦❢ t❤❡ ❡①♣❡r✐♠❡♥t ❛♥❞ ❢✉t✉r❡ ♠❡❛s✉r❡♠❡♥ts

▼❡❛s✉r❡♠❡♥t ♦❢ t❡♥s♦r ❛♥❛❧②③✐♥❣ ♣♦✇❡rs ❚✷✵✱ ❚✷✶ ❛♥❞ ❚✷✷ ✐♥ ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥✱ s✉❜st❛♥t✐❛❧❧② ❡♥❤❛♥❝✐♥❣ t❤❡ q✉❛❧✐t② ❛♥❞ ❦✐♥❡♠❛t✐❝ s♣❛♥ ♦❢ t❤❡ ❡①✐st✐♥❣ ❡①♣❡r✐♠❡♥t❛❧ ❞❛t❛✭✇❤✐❝❤ ✇❡r❡ ♦❜t❛✐♥❡❞ ❡❛r❧✐❡r ❛❧s♦ ♦♥ t❤❡ ❱❊PP ✲✸ st♦r❛❣❡ r✐♥❣✮✱ ❤❛s ❜❡❡♥ ♣❡r❢♦r♠❡❞✳ ❚❤✐s ❡♥❛❜❧❡ ❛♥ ❛❝❝✉r❛t❡ t❡st ♦❢ ❛✈❛✐❧❛❜❧❡ ♠♦❞❡❧s✳ ❚❤❡♦r❡t✐❝❛❧ ❝❛❧❝✉❧❛t✐♦♥s ♣r♦✈✐❞❡ ❛♥ ❡①❝❡❧❧❡♥t ❞❡s❝r✐♣t✐♦♥ ♦❢ t❤❡s❡ ♣♦❧❛r✐③❛t✐♦♥ ❞❛t❛ ❜❡❧♦✇ ♣✐♦♥ ♣r♦❞✉❝t✐♦♥ t❤r❡s❤♦❧❞✱ ✇❤✐❧❡ ❛❜♦✈❡ ♣✐♦♥ ♣r♦❞✉❝t✐♦♥ t❤r❡s❤♦❧❞ ❛ ✈❡r② ❣♦♦❞ ❞❡s❝r✐♣t✐♦♥ ♦❢ ❚✷✵ ❛♥❞ ❚✷✷ ✐s ❞❡♠♦♥str❛t❡❞ ❜② ❛ ♥♦✈❡❧ ❛♣♣r♦❛❝❤ ✐♥❝♦r♣♦r❛t✐♥❣ ❛ π✲▼❊❈ r❡t❛r❞❛t✐♦♥ ♠❡❝❤❛♥✐s♠✳ ❚❤❡ r❡♠❛✐♥✐♥❣ ❞✐s❝r❡♣❛♥❝✐❡s ❝♦✉❧❞ r❡✢❡❝t t❤❡ t❤❡♦r❡t✐❝❛❧ ✉♥❝❡rt❛✐♥t✐❡s ♦r s♦♠❡ ♠✐ss✐♥❣ ♦r ♣♦♦r❧② ♠♦❞❡❧❡❞ ✉♥❞❡r❧②✐♥❣ ❞②♥❛♠✐❝s✳ ❚❤❡ ❡①♣❛♥s✐♦♥ ♠❡❛s✉r❡♠❡♥ts ♦❢ t✇♦✲❜♦❞② ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥ ♦❜s❡r✈❛❜❧❡s t♦ ❤✐❣❤✲❡♥❡r❣② ♣❤♦t♦♥s ♠❛② s❤❡❞ ❧✐❣❤t ♦♥ t❤❡ r♦❧❡ ♦❢ q✉❛r❦s ❛♥❞ ❣❧✉♦♥s ✐♥ ♥✉❝❧❡❛r ✐♥t❡r❛❝t✐♦♥s✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✻

❉❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥ ❛t ❤✐❣❤ ♣❤♦t♦♥ ❡♥❡r❣② tr❛♥s✐t✐♦♥ ❢r♦♠ ♠❡s♦♥✲❜❛r②♦♥ t♦ q✉❛r❦✲❣❧✉♦♥ ♣✐❝t✉r❡ ♦❢ ❞❡✉t❡r♦♥ ❄

♣◗❈❉✿ ✭❈♦♥st✐t✉❡♥t ❈♦✉♥t✐♥❣ ❘✉❧❡✱ ❍❛❞r♦♥ ❍❡❧✐❝✐t② ❈♦♥s❡r✈❛t✐♦♥✮ ♣r❡❞✐❝ts ❛s②♠♣t♦t✐❝ ❜❡❤❛✈✐♦r✿ ❞σ/❞s → s−✶✶ ♣②, ❝′

①, ❝′ ③ → ✵

Σ → −✶ ❡①♣❡r✐♠❡♥t❛❧ r❡s✉❧ts ❢♦r ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥ ❛t θ❝♠

♣

= ✾✵◦✿ ❝r♦ss s❡❝t✐♦♥ s❤♦✇s ♣◗❈❉ s❝❛❧✐♥❣ ❛❜♦✈❡ ❊γ ≈ ✶ ●❡❱ ✭❏▲❛❜✮ ✐♥❞✉❝❡❞ ♣r♦t♦♥ ♣♦❧❛r✐③❛t✐♦♥ ✈❛♥✐s❤❡s ❛t ❊γ ≈ ✶ ●❡❱ ❛s ❍❍❈ ♣r❡❞✐❝ts ✭❏▲❛❜✮ ❜✉t Σ ❛s②♠♠❡tr② ❤❡❛❞s ❛✇❛② ❢r♦♠ ❍❍❈ ❛t ❊γ = ✶ ÷ ✶.✺ ●❡❱ ✭❨❡r❡✈❛♥✮ ❝r♦ss s❡❝t✐♦♥ → s−✶✶ ✐♥❞✉❝❡❞ ♣♦❧❛r✐③❛t✐♦♥ → ✵ ✇❤❛t ❛❜♦✉t t❡♥s♦r ❛s②♠♠❡tr✐❡s❄ Σ ❛s②♠♠❡tr② → −✶ ❄

❛r❳✐✈✿✶✶✺✵✸✳✵✺✹✸✺

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✼

❆s②♠♣t♦t✐❝ ❜❡❤❛✈✐♦r ♦❢ t❡♥s♦r ❛s②♠♠❡tr✐❡s

▼✳■✳ ▲❡✈❝❤✉❦✱ ❋❡✇✲❇♦❞② ❙②st❡♠ ✶✾ ✭✶✾✾✺✮ ✼✼✲✶✵✽ ❖♥❡ ❝✉♥ s❡❡✱ ❛❝❝♦r❞✐♥❣ t♦ ❍❍❈ t❤❡ ❛s②♠♣t♦t✐❝ ❜❡❤❛✈✐♦r ♦❢ t❡♥s♦r ❛s②♠♠❡tr✐❡s ✐s ❚✷✵ → − √ ✷✱ ❚✷✶✱❚✷✷ → ✵

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✽

P❧❛♥ ♦❢ ◆❡✇ ▼❡❛s✉r❡♠❡♥t ♦❢ ❚✷✵ ✐♥

γ + ❞ → ♣ + ♥

❚❤r❡❡ ❉❛t❛ ❚❛❦✐♥❣ ❘✉♥s✿ ❊❡ = ✵✳✽✱ ✶✳✷ ❛♥❞ ✷✳✵ ●❡❱ ◆❡✇ P❤♦t♦♥ ❚❛❣❣✐♥❣ ❙②st❡♠✿❞❡t❛❧s ✐♥ ❨✉r✐ ❙❤❡st❛❦♦✈ ♣r❡s❡♥t❛t✐♦♥✱ ✶✺✳✵✵ ◆❡✇ P❛rt✐❝❧❡ ❉❡t❡❝t✐♦♥ ❙②st❡♠✳ θ♣ = ✹✺◦ ÷ ✽✺◦ θ❈▼

♣

= ✼✵◦ ÷ ✶✶✵◦ ∆φ♣, ∆φ♥ ≈ ✷ × ✻✵◦ ▼✉❧t✐❣❛♣ ❘❡s✐st✐✈❡ P❧❛t❡ ❈❤❛♠❜❡r ✭▼❘P❈✮✿ t✐♠❡ r❡s♦❧✉t✐♦♥ ❜❡t❡r ✶✵✵ ♣s ❍❛❞r♦♥ ❙❛♥❞✇✐❝❤✿ ✶✵ ❧❛②❡rs × ✭✷✵♠♠ ■r♦♥ ✰ ✷ × ✼♠♠ s❡❣♠❡t❛t❡❞ ❙❝✐♥t✐❧❧❛t♦r✮ ❲▲❙ ✜❜❡rs r❡❛❞♦✉t ✰ ❙✐P▼s ◆❡✉tr♦♥ ❞❡t❡❝t✐♦♥ ❡✣❝✐❡♥❝②✿ ✻✵ − ✼✵✪ θ♥ ❛♥❞ φ♥ r❡s♦❧✉t✐♦♥ ✶✳✻◦ ❘✉♥✲■ ❛♥❞ ❘✉♥✲■■ ✇✐t❤♦✉t ▼❘P❈ ❘✉♥✲■■■ ✇✐t❤ ▼❘P❈

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✶✾

❍❛❞r♦♥ ❙❛♥❞✇✐❝❤

Iron 20x160x1900 mm3 + 8 Scintillator Strips 7x40x1760 mm3

Number of such units in both hadron sandwichs: 11x10x2 = 220

1900 34

SiPM SiPM

❉❡s✐❣♥ ♦❢ ❍❛❞r♦♥ ❙❛♥❞✇✐❝❤

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✵

❊✈❡♥t s❡❧❡❝t✐♦♥ ✐♥ ❘✉♥✲■ ❛♥❞ ❘✉♥✲■■

Entries 1160693 reaction identifier 5 10 15 20 25 30 35 number of events 1 10

2

10

3

10

4

10

5

10

6

10

7

10 Entries 1160693

n

+

π → p γ p π → p γ p

−

π → n γ n π → n γ

−

π

+ +

∆ → p γ π

+

∆ → p γ

+

π ∆ → p γ

−

π

+

∆ → n γ π ∆ → n γ

+

π

−

∆ → n γ p

−

π

+

π → p γ n

+

π π → p γ n

−

π

+

π → n γ p

−

π π → n γ d π → d γ p n → d γ

GENBOS+GEANT4 all events charged+neutral pair cut φ φ + cut θ θ + + AC ampl. cut + TOF(1ns) cut

event selection

▼❈ s❡♠✉❧❛t✐♦♥ ♦❢ t❤❡ ❡✈❡♥t s❡❧❡❝t✐♦♥ γ + ❞ → ♣ + ♥ r❡❛❝t✐♦♥✳ ❚✇♦✲❜♦❞② ❦✐♥❡♠❛t✐❝❛❧ ❝♦rr❡❧❛t✐♦♥ ♣❛r❛♠❡t❡rs ❛♥❞ ♣❛rt✐❝❛❧ ✐❞❡♥t✐✜❝❛t✐♦♥ ♣❛r❛♠❡t❡rs ❛r❡ ✉s❡❞✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✶

P❧❛♥s ❢♦r ❚✷✵✱ ❡①♣❡❝t❡❞ r❡s✉❧ts

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✷

❈♦❤❡r❡♥t ◆❡✉tr❛❧ P✐♦♥ P❤♦t♦♣r♦❞✉❝t✐♦♥ ♦♥ ❉❡✉t❡r♦♥ γ + ❞ → π✵ + ❞

t❤❡ ♦♥❧② ♣✐♦♥ ♣❤♦t♦♣r♦❞✉❝t✐♦♥ r❡❛❝t✐♦♥ ♦♥ ❞❡✉t❡r♦♥ ✇✐t❤ t✇♦✲❜♦❞② ✜♥❛❧ st❛t❡✳ ✐ss✉❡s ❛❞❞r❡ss❡❞✿ ❞❡✉t❡r♦♥ str✉❝t✉r❡ π✵ ✕ ❞❡✉t❡r♦♥ ❡❧❛st✐❝ s❝❛tt❡r✐♥❣ ♣✐♦♥ ♣❤♦t♦♣r♦❞✉❝t✐♦♥ ♦✛ ♥❡✉tr♦♥ ❛t t❤r❡s❤♦❧❞ ✕ ❝❤✐r❛❧ ❞②♥❛♠✐❝s ♦♥ ♥❡✉tr♦♥ ✳ ✳ ✳

P✳❲✐❧❤❡❧♠ ❛♥❞ ❍✳❆r❡♥❤ö✈❡❧✱ ◆✉❝❧✳ P❤②s✳ ❆✻✵✾✭✶✾✾✻✮✹✻✾ ✕ ❝♦✉♣❧❡✲❝❤❛♥♥❡❧ ❛♣♣r♦❛❝❤✿ ◆◆✱ ◆π✱ ◆∆

∆∆ R d d γ π 0 T

+

∆N R d d γ π 0 T

π 0 d d T γ

π 0

= d

d T γ

+

∆[2] d d γ π 0 j∆N[2] N[2] d d γ π 0 j

RN[2] d γ j

d π 0 T

+

d γ j∆N[2] d π 0 T

∆ R [2]

+ + +

❙✳❙✳❑❛♠❛❧♦✈✱ ▲✳❚✐❛t♦r ❛♥❞ ❈✳❇❡♥♥❤♦❧❞✱ P❤②s✳❘❡✈✳ ❈✺✺✭✶✾✾✼✮✾✽ ✇✐t❤ ❋❙■ tr❡❛t❡❞ ✐♥ t❤❡ ❑▼❚ ♠✉❧t✐♣❧❡ s❝❛tt❡r✐♥❣ ❛♣♣r♦❛❝❤

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✸

❉❡t❡❝t♦r ▲❛②♦✉t ❢♦r ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥

γ + ❞ → π✵ + ❞ ′ ❡✈❡♥ts ❤❛✈❡ ❜❡❡♥ s❡❧❡❝t❡❞ ❢r♦♠ t❤❡ st❛t✐st✐❝s ❝♦❧❧❡❝t❡❞ ❞✉r✐♥❣ t❤❡ ❞❡✉t❡r♦♥ ♣❤♦t♦❞✐s✐♥t❡❣r❛t✐♦♥ ❡①♣❡r✐♠❡♥t✳

❉❛t❛ ♦❢ ♦♥❡ ♣❛✐r ♦❢ ❛r♠s ✉s❡❞ ♣r♦t♦♥ ❛r♠ ★✶ ❞❡t❡❝ts ❞❡✉t❡r♦♥ ♥❡✉tr♦♥ ❛r♠ ★✶ ❞❡t❡❝ts ♦♥❡ ♦❢ γ✲q✉❛♥t✉♠ ❢r♦♠ ♣✐♦♥ ❞❡❝❛②✳ θ❞ ✷✵◦ ÷ ✹✵◦ ∆φ ✷✺◦ ❊❞ ✷✵ ÷ ✼✵ ▼❡❱

γ

d

Neutron arm #1 e Proton arm #1 Proton arm #2 Neutron arm #2 e-arm of LQ-polarimeter

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✹

❘❡s✉❧ts ♦♥ ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥

✈s✳ ❊γ

• 1
• 0.5

0.5

• 1.5
• 1
• 0.5

0.5

T20 θcm = 90o - 145o θπ

Fix, et al Kamalov, et al

T21 Eγ, MeV T22

• 0.5

0.5 200 250 300 350 400 450

✈s✳ θ❝♠

π

• 1
• 0.5

0.5

• 1
• 0.5

T20 Eγ = 250 - 450 MeV

Fix, et al Kamalov, et al

T21 θπ T22 cm

• 0.5

0.5 90o 100o 110o 120o 130o 140o 150o

❱❡rt✐❝❛❧ ❜❛rs ✕ st❛t✐st✐❝❛❧ ❡rr♦rs✱ ❍♦r✐③♦♥t❛❧ ❜❛rs ✕ ❜✐♥ s✐③❡s❀ ❙②st❡♠❛t✐❝ ❡rr♦r ≈ ✾.✹✪

❚❤❡♦r❡t✐❝❛❧ ❝✉r✈❡s✿

s♦❧✐❞ ✕ ❆✳❋✐①✱ ♣r✐✈❛t❡ ❝♦♠♠✉♥✐❝❛t✐♦♥✱ ❞❛s❤❡❞ ✕ ❙✳❙✳❑❛♠❛❧♦✈✱ ▲✳❚✐❛t♦r ❛♥❞ ❈✳❇❡♥♥❤♦❧❞✱ P❤②s✳ ❘❡✈✳ ❈ ✺✺✭✶✾✾✼✮✾✽ ❉✳▼✳◆✐❦♦❧❡♥❦♦✱ ▲✳▼✳ ❇❛r❦♦✈ ❡t ❛❧✳✱ ❏❊❚P ▲❡tt✳ ✽✾✱ ✺✶✽ ✭✷✵✵✾✮

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✺

◆❡✇ ♠❡s✉r❡♠❡♥t ❚✷✵ ✐♥ ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥

❙❝❤❡♠❛t✐❝ ✈✐❡✇ ♦❢ t❤❡ ❞❡t❡❝t♦r ❢♦r ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✻

Pr❡❧✐♠✐♥❛r② r❡s✉❧ts ❢♦r ❚✷✵ ✐♥ ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥

Pr❡❧✐♠✐♥❛r② r❡s✉❧ts ❢♦r ❚✷✵ ✐♥ ❝♦❤❡r❡♥t π✵ ♣❤♦t♦♣r♦❞✉❝t✐♦♥✳ ❚❤❡♦r❡t✐❝❛❧ ♣r❡❞✐❝t✐♦♥✿ ❆✳❋✐①✱ ♣r✐✈❛t❡ ❝♦♠♠✉♥✐❝❛t✐♦♥ ✭s♦❧✐❞ ❝✉r✈❡✮✱ ❙✳❙✳❑❛♠❛❧♦✈✱ ▲✳❚✐❛t♦r ❛♥❞ ❈✳❇❡♥♥❤♦❧❞✱ P❤②s✳ ❘❡✈✳ ❈ ✺✺✭✶✾✾✼✮✾✽ ✭❞❛s❤❡❞ ❝✉r✈❡✮✳

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✼

P❛rt✐❝✐♣❛♥ts ◆♦✈♦s✐❜✐rs❦ ❊❧❡❝tr♦♥✲❉❡✉t❡r♦♥ ❈♦❧❧❛❜♦r❛t✐♦♥

❆✳❱✳ ●r❛♠♦❧✐♥✱ ❱✳❋✳ ❉♠✐tr✐❡✈✱ ❱✳ ❑✉❞r②❛✈ts❡✈✱ ❇✳❆✳ ▲❛③❛r❡♥❦♦✱ ❙✳■✳ ▼✐s❤♥❡✈✱ ❉✳▼✳ ◆✐❦♦❧❡♥❦♦✱ ■✳❆✳ ❘❛❝❤❡❦✱ ❘✳❙❤✳ ❙❛❞②❦♦✈✱ ❨✉✳❱✳ ❙❤❡st❛❦♦✈✱ ❉✳❑✳ ❚♦♣♦r❦♦✈✱ ▲✳■✳ ❙❤❡❦❤t♠❛♥ ❛♥❞ ❙✳❆✳ ❩❡✈❛❦♦✈ ❇■◆P✱ ◆♦✈♦s✐❜✐rs❦✱ ❘✉ss✐❛ ❆✳❨✉✳ ▲♦❣✐♥♦✈✱ ❱✳❱✳ ●❛✉③s❤t❡✐♥✱ ❱✳◆✳ ❙t✐❜✉♥♦✈ ❚P❯✱ ❚♦♠s❦✱ ❘✉ss✐❛ ❘✳❏✳ ❍♦❧t✱ ❉✳❍✳ P♦tt❡r✈❡❧❞ ❆◆▲✱ ❆r❣♦♥♥❡✱ ■▲✱ ❯❙❆ ❘✳ ●✐❧♠❛♥ ❘✉t❣❡rs ❯♥✐✈❡rs✐t②✱ P✐s❝❛t❛✇❛②✱ ◆❏✱ ❯❙❆ ❍✳ ❞❡ ❱r✐❡s ◆■❑❍❊❋✱ ❆♠st❡r❞❛♠✱ ❚❤❡ ◆❡t❤❡r❧❛♥❞s ❙✳▲✳ ❇❡❧♦st♦ts❦②✱ ❱✳❱✳ ◆❡❧②✉❜✐♥ ■◆P✱ ❙t✳✲P❡t❡rs❜✉r❣✱ ❘✉ss✐❛ ❍✳ ❆r❡♥❤ö✈❡❧ ■❑P✱ ❏♦❤❛♥♥❡s ●✉t❡♥❜❡r❣✲❯♥✐✈❡rs✐tät✱ ▼❛✐♥③✱ ●❡r♠❛♥②

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✽

❈♦♥❝❧✉s✐♦♥

Using the method of internal target in electron storage ring the experiments for elastic (e ❞) – scattering, two-body deuteron photodisintegration, and coherent pion photoproduction on the tensor polarized deuteron were performed. Obtained data assist to understand the details of the deuteron structure and the details of reactions mechanism. The data for photo-reactions were obtained only on the VEPP-3 storage ring. Preliminary data of new measurement of T✷✵ in coherent π✵–photoproduction on deuterium are presented. At banner experiment the T✷✵ in two-body deuteron photodisintegration at ❊γ = ✵.✺ . . . ✶.✺ GeV will be measured.

Thank you for attention!

❉✳ ◆✐❦♦❧❡♥❦♦ ❢♦r ❉❊❯❚❊❘❖◆ ❈♦❧❧❛❜♦r❛t✐♦♥ ❊①♣❡r✐♠❡♥ts ✇✐t❤ t❡♥s♦r ♣♦❧❛r✐③❡❞ ❞❡✉t❡r♦♥ t❛r❣❡t ❛t ❱❊PP✲✸ st♦r❛❣❡ r✐♥❣✳ ❊▼■◆✷✵✶✺✱ ❖❝t♦❜❡r ✼ ✷✵✶✺ ✷✾