Precision linearity studies of the ATLAS liquid argon EM calorimeter

(1)

HAL Id: in2p3-00021997

http://hal.in2p3.fr/in2p3-00021997

Submitted on 30 Jun 2004

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Precision linearity studies of the ATLAS liquid argon

EM calorimeter

G. Graziani

To cite this version:

(2)

Giacomo Graziani

(LAL, Orsay)

for the ATLAS LAr EM Group

XI International Conference in Calorimetry in High Energy Physics

Perugia, Italy

(3)

➬

_{Electromagnetic Calorimetry for the general–purpose}

ATLAS experiment at the LHC should provide a

linearity well within 1 % from the GeV to the TeV scale

and even much better in limited energy ranges

e.g. precision measurement of W mass requires a linearity

within a few 10

−

4 between 30 and 80 GeV

➬

_{First precision linearity measurement has been}

performed on a LAr Barrel Calorimeter module,

exposed to electron beam (CERN H8 test line)

Need to know the beam energy scale to a few 10

−

4 =⇒

calibration of the beam line between 10 and 180 GeV

Need to understand in principle the most suitable energy

reconstruction procedure

=⇒

study detector response through accurate MC (Geant4)

simulation

Need to accurately inter–calibrate the detector layers

(4)

>?

E

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Bdl

AB CD EF D B G E CH I JK L I M JN CO

C9

B3

B4

B3

B4

B1

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B1

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~27 mm/%

Target

∆P/P~1%

T4

C6

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10 −4

_ V V lT _ V p l X W Z [rq s s o n s _ W Y ` T_ W a\ Z S Q T b \ T c QR Y p st u P vw _a Q c \ Z _ T b Q TQ QZ V Q c_ [ Z Q aY p c _ Q X lTW Z [ ag Qx \ _` a [ Q W Z R lV QR Y p V lT T QZ a S l W` XZ [ \ Z _ Z_ T T \^ \ `\ S c _ R Q\b ^ a \ ^ W T Q X XTa Q aV g QR _ \ ` Z [ ag QY _ Q c S _ ag n y V V lT_ V p{z Y Q a a TQ ag_ Z

10 −4

\ Z ag QT_ Z [ Q\b W Z a TQ Q X an

Hall Probe

vacuum chamber

(5)

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Å v \ c Q c_ a TWQ _ ` d x _ V l l c ^ W Z R \ ^ X i XVW Z a W _ ` ` W a\ Z _ Z R s TQ QZ h \ x V \ lZ a TQ X i Q Va n m W X X SUT Q _ R _ \ ` Z [ ag Q

∼

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=⇒

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0

50

100

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14

16

0

200

400

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50

52.5

0

200

400

600

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1200

95

100

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15 GeV

MC

MC with 0.08 X

₀

brem.

DATA

50 GeV

100 GeV

180 GeV

(8)

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∆ϕ = 0.0245

∆η = 0.025

37.5mm/8 = 4.69 mm

∆η = 0.0031

∆ϕ=0.0245

x4

36.8mm

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=147.3mm

Trigger Tower

Trigger

Tower

∆ϕ = 0.0982

∆η = 0.1

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0 4.3X

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0 1500 mm

470 mm

η

ϕ

η = 0

Strip towers in Sampling 1

Square towers in

Sampling 2

1.7X

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∆ϕ×∆η = 0.0245×0.05

η =

0 η =

0.687 η =

1.475

(9)

(10)

o g l X i X _ c S ` W Z [ b T_ V a W \ Z XV_ ` Q ^X W ag ag Q \ ` Z [ W a lRW Z_ ` Xg \ ^ Q T R x Q Q ` \ S c QZ a á\ T Xg \ ^ Q T X b l ` ` p V \ Z a _ W Z QR W Z ag Q _ V V \ T R W \ Z R Q a Q V \ a T i ag Q X _ c S ` W Z [ b T _ V a W \ Z Y Q V \ c Q X W Z R Q S QZ R QZ a \ Z QZ Q T [ p _ Z R \ Z ` \ Z [ W a lR W Z _ `ã lV a_ l a W \ Z X

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0

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1550

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0.14

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1550

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1650

1700

1750

1800

1850

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Energy profile

depth (mm)

10 GeV

Energy profile

100 GeV

Energy profile

500 GeV

depth (mm)

sampling fraction

depth relative to maximum

(11)

Lï Cð ñ í C C EF K C í Lï í LK í ê C L C ó ô G í í ð C K G ñõ ö ÷ G B ä GëK CD K ì C G å å LD äç L B ó è L B Eùø è C Gú G E C ÷

=⇒

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ACCORDION

event depth (X

₀

)

(12)

ý Ä þ ì C B C CD EF è LK í æ ô í K D C Gò K ì C G å å LD äç BL ç í CK ç í ò K G Cä Cð C B K ê F Cð C B K ê F K ì C õ D C é í Gò ô è CD ÿB C å B G B ä Cò ô ç çD å Gè è F G ò G E ç å ï ç C E ì K K ì K G ò Gú C í K ì C æë è è ä K C CåK LD ç è B C GD ñ G B ä ò Gú C Kí ì C D Cå L B í K D æ åK Cä C B é CD EF ç B ä C ô C B ä C B K L B è L B E ø æ åK æ K G ç L B í K G K ì C í Gò C K ç ò CH

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=⇒

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0.03

0.04

0.05

0.06

0.07

0

1

2

3

4

5

6

7

8 REAL DATA

Nonlinearity vs PS weight

Resolution vs PS weight

PSweight

(13)

a Q _ xa Q Q V \ X a lV a Q [ p _ X

E =

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∼

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f

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s

_ Z R

f

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∝

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E

ST RIP S

m

10 GeV

50 GeV

100 GeV

500 GeV

900 GeV

event depth (X

₀

)

fraction of long. leakage

10 -3

10 -2

(14)

(15)

(16)

x L T V H \ P I HI O JI LT OY P K yz {| }~ ~ | } ~ | | ~ ~ ~ ~ | ~ ~ ~ | ~ ~ ~ ~ | ~ } ¡ | ~ ~ ~ ~

E

_{M I DDLE}

cell

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¢ £ } } ~ ¤

10 −

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HIGH gain region

MEDIUM gain region

E

free gain

(GeV)

(17)

®¯° ®± ²´³ ®µ ¯ ³ µ °¶ ·¸ ·¹ º° · ® ·» ¸ ¼ ½ ®¾ µ° ·¿ » ®À µ ¯° ¿ ·¹ °¶ · » ° · ·° ½ ®¿ ° ¿ ¹ µ ¯ º ·¿ ¯ · ² ¿ ~Á® · ¹ µ Á ¹ ¼ ¯ ³ ¯Â ² ¹ ¿ ¹ ° · ¿ ³Ã · ·Ä | Ä ¶ ¯ ®À ·¿ ² ¿ ~Á® · À ³°¶ ¿ ·¹ Á · Á · ½ ° ¿ ®µ ¯ Å ¹ µ » ¹ ² ² Á ¼ ¹

χ

2

½ ¾° Â

χ

2 =

1 N − 3

layer=1,3

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(E

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layer

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(∆η, ∆φ))

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(∆η, ∆φ)

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layer

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i

=⇒

½¾° ®µ Á ¼ » · ² · µ » ¯ ®µ ¯ ¶ ®À ·¿ ¯ ¶ ¹ ² · Å µ ® ° ®µ ¹¸ ¯ ® Á ¾° · ·µ ·¿ Æ ³ · ¯ ½ Á ·¹ ¿ ¯ ¾ ² ² ¿ ·¯ ¯ ³ ®µ ®± ²´³ ®µ ¯ ¶À ·µÁ ® ®ÇÉÈ ³ µ Æ ¹° °¶ °· ° ®Á ¹ ·µ ·¿ Æ ¼ ¹ µ »Ê Ë µ· ·¿ Æ ¼

0

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10

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20

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80

100

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2 Raw cluster energy

GeV

(18)

(19)

Ò ² ¿Á ·³ ³ µ ¹ ¿ ¼ Ó ä O I LT YO P K Ò µ ®¿ Á ¹ ³Ã · » ° Ï ® Ð Ð Ù · Ú Ó