83

Measurement of the proton structure function F 2 at low Q 2 in QED Compton scattering at HERA

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10-1

1

10

10 2

10 3

10 4

10 5

10-6

10-5

10-4

10-3

10-2

10-1

1x

Q2 (

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2 )

kinem

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limit

y=1

y = 0.

005

ZEUS NVX 1994

ZEUS SVX 1995

ZEUS BPC 1995

ZEUS BPT 1997 (Preliminary)

E665

BCDMS

CCFR

SLAC

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Q2 (GeV2)

λ eff

0.0

03 0

.005

0.0

13 0

.114

0.6

82 0

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1.8

26 3

.838

2.3

98 1

.828

1.3

15 0

.611

0.2

04 0

.790

0.6

69 1

.561

0.9

71 1

.929

2.0

76 3

.377

2.6

69 3

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3.6

93 4

.707

4.8

28 5

.274

6.1

79 6

.282

6.9

94 7

.911

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

10-1

1 10 102

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1

10

1 10 102

103

Q2/GeV2

F2 x=5E-05

(x 46)

Q2/GeV2

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x=8E-05(x 35)

Q2/GeV2

F2

x=0.00013(x 25)

Q2/GeV2

F2

x=0.0002(x 18)

Q2/GeV2

F2

x=0.00032(x 12)

Q2/GeV2

F2

x=0.0005(x 8)

Q2/GeV2

F2

x=0.0008(x 5.5)

Q2/GeV2

F2

x=0.0013(x 3.8)

Q2/GeV2

F2

x=0.002(x 2.5)

Q2/GeV2

F2

x=0.0032(x 1.8)

Q2/GeV2

F2

x=0.005(x 1.3)

Q2/GeV2

F2

x=0.008(x 1)

H1 97 prel.

H1 94-97 prel.

NMC

QCDFit prel.

H1 97 preliminary

10-1

1

10

1 10 102

103

104

Q2/GeV2

F2

x=0.013(x 30)

Q2/GeV2

F2

x=0.02(x 23)

Q2/GeV2

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x=0.032(x 18)

Q2/GeV2

F2

x=0.05(x 14)

Q2/GeV2

F2

x=0.08(x 10)

Q2/GeV2

F2

x=0.13(x 8)

Q2/GeV2

F2

x=0.18(x 6)

Q2/GeV2

F2

x=0.25(x 4)

Q2/GeV2

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x=0.4(x 4)

Q2/GeV2

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0

10

20

30

40

50

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10-3

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Q2 = 1 GeV2

0

20

40

60

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10-3

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Q2 = 20 GeV2

0

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0

5

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QU OX [ O _ _^ [ TR Q ^ X ]� V T [ T ]P [ PU [ TR Q �^ X ] [ VWQ ^ _ _ T\ Q [ VP b P^ Q WR Pb P X [ T f [ VP ^ R R O `^ _ [ Ob P T f

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0.000

0.025

0.050

0.075

0.100

0.125

0

20

40

60

80

100

(1/E

0)dE

/dt

t = depth in radiation lengths

Num

ber

cros

sing

pla

ne

30 GeV electron incident on iron

Energy

Photons × 1/6.8

Electrons

0 5 10 15 20

� �� + 0+ . . B :4 0 73 6 :; 1 ; 8 3 � � � 5�5 7 5 � 6 9 ;4 3 @ 1 5 6 : � < A ;+ 59 :1 :9 ; 1 D A 5A : < 6 ; @ 9 34 < A ;+ < 6 A 5 89 3 � 6 :; 1 3 7 51 59 @ � 2 5 ; < : 6 :; 1 59 01 : 6 9 3 2 :3 6 : ;17 51 @ 6 A� 6 A 5 � 0 9 � 5 : < 3 � 6 6 ; 6 A 5 2 : < 6 9 : ? 0 6 : ;1 D � :9 � 7 5 < :1 2 : �3 6 5 6 A 51 04 ? 59; 8 5 7 5 � 6 9 ; 1 <� < � 0 3 9 5 < 6 A 51 04 ? 59 ; 8

A ; 6 ;1 < 3 ? ; � 5 � � C 5� 3 6 6 A 5 @ :� 512 5 6 A = 9 5 9 ; 2 0 � 5 2 89 ;4 � � � > D

STR ^ Q ^ X ]\ OU VU ^ _ TR Ob P [ PR © TR b TR P YP X PR ^ _ _¢ fTR ^ U Tb � T WX ] T f � ]O ¨PR P X [b ^ [ PR O^ _Q \ O [ VfR ^ U [ O TX Q � � � Z¢ \ P O Y V[ �© [ VP P ¨PU [ O `P R ^ ]O^ [ O TX _P X Y [ V OQ ^ � � R T ª Ob ^ [ P _¢ YO `P X Z¢

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S TR � ^ R [ OU _PQ T [ VPR [ V^ X P _PU [R TX Q ^ X ]� V T [ TX Q © [ VP ] Tb OX^ [ OX Y P X PR Y¢ _ TQ Q b PU V^ X OQ b OQ Z¢O TX O£^ [ O TXk � VP^ `PR ^ YP P X PR Y¢ _ TQ Q R ^ [ P �: � � 1 OQ [ VP X ^ � � R T ª Ob ^ [ P _¢ YO `P X Z¢ [ VP jP [ VP c j _ TU VfTR b W _^ ^ Q O _ _ WQ [R ^ [ P ] OX SO Yk �k �k STR V^ ]R TX Q © [ VP ]P `P _ T� b P X [ T f [ VP Q V T\ PR © Ok Pk [ VP � R T ] WU [ O TXT fQ PU TX ]^ R ¢ � ^ R [ OU _PQ © TU U WR Q Z¢ Q [R TX Y OX [ PR ^ U [ O TX T f [ VP V^ ]R TX Q \ O [ V [ VP ^ ZQ TR ZPR b ^ [ PR O^ _ka W TX Q © \ VOU V^ R P X T [Q W Z «PU [ [ T [ VP Q [R TX Y OX [ PR ^ U [ O TXl© U TX Q P� W P X [ _¢ OX [ PR ^ U [\ O [ V^ ZQ TR ZPR Q Z¢O TX O£^ [ O TX TX _¢^ X ]U ^ X [R ^ `PR Q P _ TX Y ]OQ [^ XU PQ ZP fTR PU Tb OX Y [ TR PQ [k

1

2

3

4

5 6

8

10

1.0 10 100 1000 10 0000.1

Pion momentum (GeV/c)

Proton momentum (GeV/c)

1.0 10 100 10000.1

1.0 10 100 10000.1

1.0 10 100 1000 10 0000.1

−dE

/dx

(MeV

g−1

cm2 )

βγ = p/Mc

Muon momentum (GeV/c)

H2 liquid

He gas

CAl

FeSn

Pb

� �� + 0+ �. � � 5 9 3 @ 5 51 59 @ � 7; < < 9 3 6 5

� � � � 2 :1 7 : � 0 : 2 A� 2 9 ; @ 51 � @ 3 < 5; 0 <A 5 7 : 04 � �3 9 ? ;1 � 3 7 04 :1 04 � :9 ; 1 � 6 :1 �3 1 2 7 53 2 = 9 5 9 ; 2 0 � 5 2 89 ;4 � � � > D �

3 9 6 : � 7 5 3 6 6 A 54 :1 :4 04 � � � � 2 : <�3 7 7 5 2 3 4 :1 :4 04 :; 1 : � :1 @ 3 9 6 : � 7 5=C � � > D

t^ ]R TX OU Q V T\ PR Q V^ `P ^ b WU V _^ R YPR [R ^ X Q `PR Q P ^ X ] _ TX YO [ W ]OX^ _Q O£ P [ V^ X P _PU [R Tb ^ YX P [ OUQ V T\ PR Q T f [ VP Q ^ b P P X PR Y ¢k � VPU V^ R ^ U [ PR OQ [ OU QU ^ _P OQ [ VP V^ ]R TX OU OX [ PR ^ U [ O TX _P X Y [ V ;© ]P ¦X P ]

^ Q [ VP [R ^ `PR Q P ] ]OQ [^ XU P^ f[ PR \ VOU V^ _ _ Z W [ o �� T f^ _^ R YP X Wb ZPR T f V^ ]R TX Q V^ `P W X ]PR Y TX P^ [_P^ Q [ TX P OX [ PR ^ U [ O TX© \ VOU V OQ [ ¢� OU ^ _ _¢ b WU V _^ R YPR [ V^ X [ VP P _PU [R Tb ^ YX P [ OU R ^ ]O^ [ O TX _P X Y [ V%� �Pk Yk ;@ u � %� fTR [ VP­ s i � WR ^ X O Wb cQU OX [ O _ _^ [ TR U ^ _ TR Ob P [ PR �k

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SRTD (front plane of RCAL)

Exit windows

Connection to cylindricalcentral beampipe

T-beam plusPMT housing

BPC northmodule

BPC southmodule

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Q2 (GeV2)

num

ber

of e

vent

s

DJANGORAPGAP

log x

num

ber

of e

vent

s

log y

num

ber

of e

vent

s

107.3 / 99A0 0.9991

Q2 (GeV2)

DJA

NG

O/R

AP

GA

P 88.30 / 89A0 0.9997

log x

DJA

NG

O/R

AP

GA

P 100.2 / 99A0 0.9994

log y

DJA

NG

O/R

AP

GA

P

10 3

10 4

10 5

-2 0

10 3

10 4

-5 -2.5 0

10 3

10 4

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0.50.6

0.70.8

0.91

1.1

1.21.31.4

1.5

-2 00.50.6

0.70.8

0.91

1.1

1.21.31.4

1.5

-5 -2.5 00.50.6

0.70.8

0.91

1.1

1.21.31.4

1.5

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� VP X P \ � TQ O [ O TX R PU TX Q [R WU [ O TX OX [ VP j r ¡ WQ PQ ^ b P [ V T ] OX Q � OR P ] Z¢ s¥ s ¡ r � � ��� � �© [ VP� TQ O [ O TX R PU TX Q [R WU [ O TX R T W [ OX P fTR [ VP ¡ m¥k � VP fT _ _ T\ OX Y ]PQU R O� [ O TX ^ � � _OPQ [ T % ¦X YPR Q ©^ _ [ V T W Y V O [\ TR gQ P ª^ U [ _¢ [ VP Q ^ b P \ ^ ¢ fTR � ¦X YPR Q � TR \ T W _ ]\ TR g© O f [ VP j r� V^ ] �� _^ X PQ �k�X [ VP ¦R Q [ Q [ P� © ^ X Ob Z^ _^ XU P fW XU [ O TX OQ ]P ¦X P ] WQ OX Y [ VR P P ¦X YPR Qn [ VP TX P \ O [ V [ VPVO Y VPQ [ P X PR Y¢ ]P� TQ O [© ^ X ] O [Q [\ T X P O Y V Z TR Q k � VP P X PR Y¢ ]P� TQ O [Q OX [ VPQ P ^ R P ]P X T [ P ] Z¢: �© : 9^ X ] : © R PQ � PU [ O `P _¢k � VP ¢^ R PU ^ _O ZR ^ [ P ]\ O [ V [ VP ¦X YPR U ^ _O ZR ^ [ O TX U TX Q [^ X [Q © Z W [ [ VP� TQ O [ O TX c ]P� P X ]P X [U TR R PU [ O TX Q ^ R P X T [^ � � _OP ]k � VP Ob Z^ _^ XU P OQ [ VP X ]P ¦X P ]^ Q

Ob Z^ _ . � 9 � : � : 9 � � � � : �� : � � � � � : � : 9 � 5 � �k o � �

\ VPR P � 9 / / / � �^ R P � ^ R ^ b P [ PR Q [ T ZP T� [ Ob O£ P ] _^ [ PR k �X ^ Q PU TX ]Q [ P� © [ VP Ob Z^ _^ XU P OQ U TX `PR [ P ]OX [ T^ � TQ O [ O TX R P _^ [ O `P [ T [ VPU P X [ PR T f [ VP b TQ [ P X PR YP [ OU ¦X YPRn

% . § / �U b 2 ^ RU [^ X � � �2 Ob Z^ _ �

^ RU [^ X � � � � � � / � �k o � �

� VP � ^ R ^ b P [ PR � � ]P [ PR b OX PQ [ VP Q V^ � P T f [ VPU TX `PR Q O TX fWXU [ O TX© \ VO _P � [^ gPQ OX [ T^ U U T W X [^� TQ Q O Z _P b OQ ^ _O YX b P X [ T f [ VP j r� R P _^ [ O `P [ T [ VP j r ¡^ [ [ VP Q [^ YP T f T� [ Ob O£ OX Y [ VOQ ^ _ Y TR O [ Vb k¥^ [ PR © fTR � TQ O [ O TX R PU TX Q [R WU [ O TX ^ X ]^ _O YX b P X [ T f j r ¡^ X ] j r� © � OQ Q P [ [ T £ PR TkiQ OX YP _PU [R TX Q OX ^ ZR T^ ]P X PR Y¢ R ^ X YP© � [ VP � ^ R ^ b P [ PR Q � � / / / � �\ O [ V � 9 ¦ª P ]^ [ o© \ O [ V T W [_ TQ Q T f YP X PR ^ _O [ ¢ �^ R P ]P [ PR b OX P ] fR Tb ^ Y _ T Z^ _ ¦ [ WQ OX Y a� e i�� k � VP ¦ [ OQ � PR fTR b P ] fTR ]^ [^^ X ] a ¡Q P� ^ R ^ [ P _¢k � VP � � [ T ZP b OX Ob O£ P ] OQ ]P ¦X P ]^ Q

� � . ! %�� � � � %�� � �§ / u uU b � >: � ¤P ¬ �" �

/ � �k o � �

� V T W Y V [ VP X P P ] fTR O [ b ^ ¢ ZP X T [^ � R O TR O T Z `O T WQ © O [ [ WR X Q T W [ [ V^ [ � � OQ ^ X PU PQ Q ^ R ¢� ^ R ^ b P [ PR OX TR ]PR [ T T Z [^ OX ^ Q ¢b b P [R OU ]OQ [R O Z W [ O TX T f % . %�� � � � %�� � �k � VPU Tb � _P [ P_OQ [ T f� ^ R ^ b P [ PR Q OQ YO `P X OX � ^ Z _P �k uk � VP T Z [^ OX P ] `^ _ W P T f � � �X ] f . o/ o OQ [ VP Q ^ b P fTR ]^ [^^ X ] a ¡k

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H FN H JQ D e J ` RD[ � B [

� � P �: : �L � � � � : �� � � L � �

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� � � � : �� � � [ M M �

&' ()* �+ . . � ; < : 6 : ;1 9 5 �; 1 < 6 9 0 � 6 :; 1 3 9 34 5 6 59 < 2 5 6 594 :1 5 2 8; 9 23 6 3 = 7 5 8 6 > 3 1 2 C ; 1 6 5 � 3 9 7 ;= 9 :@ A 6 > 89 ;4 3 @ 7; ? 3 7 � 6 0 < :1 @ C � � � D

� VP Q ^ b P � ^ R ^ b P [ PR Q ^ Q fTR [ VP %R PU TX Q [R WU [ O TX ^ R P^ _Q T WQ P ] fTR [ VP �R PU TX Q [R WU [ O TXk � VOQOQ b ^ OX _¢ ] W P [ T^ _^ U g T f^ _ [ PR X^ [ O `PQ 6 TX [ VP T [ VPR V^ X ]© [ VPR P OQ X T Y T T ]R P^ Q TX [ T^ Q Q Wb P [ V^ [[ VP � ^ R ^ b P [ PR Q P [Q Q V T W _ ] ZP `PR ¢ ]O ¨PR P X [k SO Y WR P �k �Q V T\ Q [ V^ [ [ VP � TQ O [ O TX R PU TX Q [R WU [ O TX\ TR gQ OX ]P P ]\ P _ _ OX Z T [ VU T TR ]OX^ [ PQ k � VP �X P^ R _¢ �U Tb � _P [ P ^ ZQ P XU P T fQ [R WU [ WR PQ T f [ VP Q O£ PT f^ j r ¡ ¦X YPR � § / �U b � OX ]OU ^ [ PQ [ VP � W^ _O [ ¢ T f [ VP � TQ O [ O TX R PU TX Q [R WU [ O TX ^ _ Y TR O [ Vb k� VP P X PR Y¢ ]P� P X ]P XU P T f [ VP � TQ O [ O TX R PQ T _ W [ O TX U ^ X TX ^ `PR ^ YP ZP ]PQU R O ZP ] Z¢ % .§ / u uU b � >: � ¤P ¬ � � SO Yk �k � �© \ VOU V OQ ZP [ [ PR Z¢^ f^ U [ TR o/ � [ V^ X [ VP R PQ T _ W [ O TX T f [ VP T _ ]

^ _ Y TR O [ Vb kmX T [ VPR ^ ] `^ X [^ YP T f [ VOQ R PU TX Q [R WU [ O TX b P [ V T ] OQ [ V^ [ O [ OQ � TQ Q O Z _P [ TU Tb � ^ R P^ _ _ fP^ [ WR PQZP [\ P P X ]^ [^ ^ X ] a ¡k � VP � TQ O [ O TX c ]P� P X ]P XU P T f [ VP ZO^ Q OQ fT WX ] [ T fT _ _ T\ ^ Q OX WQ T O ]^ _Q V^ � P

�� SD b F Q I `D GD ` W U G F E UD `D b G W F H b R G U W U K W eD H WH JI I D H X W � � N � N

� � � �� � � � � �� �� � �� � �� � � � � ��

-3

-2

-1

0

1

2

3

6 8 10

Data X (cm)

Y (

cm)

-3

-2

-1

0

1

2

3

6 8 10

MC X (cm)

Y (

cm)

� �� + �+ �. � 5 � ;1 < 6 9 0 � 6 5 2 ; < : 6 :; 1 ; 8 < �3 6 6 5 9 5 2 5 7 5 � 6 9 ;1 < :1 6 A 5 � � � 8; 9 23 6 3 = 7 5 8 6 > 3 1 2 C �= 9 :@ A 6 > D

\ O [ V £ PR T PQ ZP [\ P P X ¦X YPR Q ^ X ] OX [ VP OR U P X [ PR ^ X ]^ b � _O [ W ]PQ T f � �§ § �b OX ZP [\ P P Xk � VP� TQ O [ O TX R PQ T _ W [ O TX Ob � R T `PQ \ O [ VP X PR Y¢k � [ OQ ZPQ [U _ TQ P [ T [ VP ¦X YPR P ] YPQ ^ X ]\ TR Q P X Q [ T\ ^ R ][ VP ¦X YPR U P X [ PR Q © `^ R ¢ OX Y Z¢^ Z T W [^ f^ U [ TR T f [\ T � SO Yk �k � �k � VP Q V T\ PR \ O ] [ VQ © � �^ X ]

� �© ^ R PU ^ _U W _^ [ P ]^ Q [ VP Q PU TX ]b Tb P X [Q T f [ VP _ T Y^ R O [ Vb OU P X PR Y¢ \ P O Y V[ P ]Q Wb OX [ VP j r ¡¦X YPR Q k� � � � � � - � % �� ! � � & '� % � � % �& ' � ' ) � * � � ' ( � ' %

m [ [ VP ZP YOX X OX Y T f j r� ]^ [^ [^ gOX Y© [ VP R PU TX Q [R WU [ O TX � ^ U g^ YP j r� q s ¡ � e � � � � P ª OQ [ P ]

^ _R P^ ] ¢© ^ X ] O [\ ^ Q P ª� PU [ P ] [ V^ [ O [\ T W _ ] TX _¢ V^ `P [ T ZP^ ]^ � [ P ] [ T [ VP � W X P ª� PU [ P ] �Q O [ W^ [ O TXT f V^ `OX Y [\ T OX Q [ P^ ] T f ¦ `P � _^ X PQ © ^ X ] [ T [ VP ZP fTR P V^ X ] WX gX T\ X ^ _O YX b P X [ � ^ R ^ b P [ PR Q� �© o u �© o u � �k iX fTR [ W X^ [ P _¢© O [ [ WR X P ] T W [ [ V^ [ j r� q s ¡ � e OQ �^ [ _P^ Q [ fTR [ VP Q O [ W^ [ O TX T fV^ `OX Y TX _¢ [\ T %� _^ X PQ © ^ X ] fTR [ VP � WR � TQ P T f ]P [ PR b OX OX Y^ _O YX b P X [ � ^ R ^ b P [ PR Q �b TR PU Tb � _OU ^ [ P ]^ X ] _PQ Q �P ª O Z _P [ V^ X X PU PQ Q ^ R ¢k �� VPR P fTR P© fTR [ VOQ ^ X^ _¢Q OQ [ VP Q Ob � _PQ [� TQ Q O Z _P [R ^ U gR PU TX Q [R WU [ O TX ^ _ Y TR O [ Vb \ ^ Q WQ P ]n[ VP u c ]Ob P X Q O TX^ _� R T «PU [ O TX T f^ [R ^ U g OX [ VP % c �� _^ X P OQ [^ gP X [ T ZP [ VP Q [R ^ O Y V[ _OX P « T OX OX Y[\ T VO [Q OX [ VP j r� k � f [ VPR P OQ b TR P [ V^ X TX P VO [ OX ^ j r� � _^ X P© [ VPU Tb ZOX^ [ O TX \ VOU V ¦ [QZPQ [ \ O [ V [ VP Q V T\ PR � TQ O [ O TX OX [ VP j r ¡^ X ]\ O [ V^ X ^ Q Q Wb P ] P `P X [ `PR [ P ª^ [ [ VP X Tb OX^ _OX [ PR ^ U [ O TX � T OX [ OQ U V TQ P Xk � [ V^ Q ZP P X U VPU gP ] � � � [ V^ [ [ VP OX � W P XU P T f [ VP b ^ YX P [ OU ¦P _ ]©\ VOU V OQ X P Y _PU [ P ] OX [ VOQ b P [ V T ]© OQ `PR ¢ Q b ^ _ _ � SO Yk �k � �k mX ¢\ ^ ¢ O [Q V T W _ ] ZP Q Ob W _^ [ P ] �^ [_P^ Q [ [ T Q Tb P P ª [ P X [ � OX a �­ m q� © ^ X ] [ VPR P fTR P � TQ Q O Z _P Q ¢Q [ Pb ^ [ OU P ¨PU [Q ] W P [ T X P Y _PU [ OX YO [^ R P Q Ob W _^ [ P ] OX [ VP a ¡^ X ] V^ `P [ VWQ X T X P [ P ¨PU [ TX [ VP ! �^ X^ _¢Q OQ kt^ `OX YR PU TX Q [R WU [ P ] [ VP j r� [R ^ U g© O [U ^ X P^ Q O _¢ ZP P ª [R ^ � T _^ [ P ] [ T [ VP �� TQ O [ O TX T f [ VPfR TX [ f^ U P T f [ VP j r ¡© [ VPU P X [ PR T f YR ^ `O [ ¢ OX � T f [ VP Q V T\ PR OX Q O ]P [ VP j r ¡© ^ X ] [ VP b P^ X% `PR [ P ª T f [ VP R WXk � VP _^ [ [ PR � T OX [ T fP ª [R ^ � T _^ [ O TX � R T `O ]PQ [ VP j r� cb P^ Q WR P ] `PR [ P ª OX �©\ VO _P [ VP fTR b PR ^ R P WQ P ] [ T^ � � _¢ [ VP ¦ ] WU O^ _^ R P^ ^ X ] [R ^ U gb ^ [U VOX YU W [Q OX [ VP^ X^ _¢Q OQ k mXP ª^ b � _P T f^ R PU TX Q [R WU [ P ] P `P X [\ O [ V^ X P _PU [R TX OX [ VP j r ¡^ X ] j r� OQ Q V T\ X OX SO Yk �k pkiQ OX Y^ _^ R YP Q ^ b � _P T fb P ]O Wb [ T VO Y VP X PR Y¢ P _PU [R TX Q \ O [ V^ Y T _ ]dc� _^ [ P ] VO [� ^ [ [ PR X OX[ VP j r� � TX P VO [� PR � _^ X P �^ X ]^ \ P _ _dcR PU TX Q [R WU [ P ] ¡� N `PR [ P ª � fR Tb ^ [ _P^ Q [ [ VR P P [R ^ U gQ

� a G d J U J ` U F EF R H X � J ` G S F R K S HD eD T WH eD U G W K J GD X WH XD G J W ` � G S J G c � � � �� K W eD U J U ` W K S G `i d F T UD �� � T D U F ` R G W F HJH X f W J U F ET D b F H U GT R b GD XD `D b GT F H JH K `D JH XD eD H G eD T GD � G S JH G SD U WQ I `D U GT J W K S Gh ` WHD T D b F H U GT R b G W F Hg D eD H EF T

� � d SD T D F HD d F R ` X H F GD �I D b G G F UD D D �D b G UT D ` J GD X G FI F U U W f `i dT F H K J ` W K H Q D H GI JT JQ D GD T UN�� SD b F Q I `D GD ` W U G F E UD `D b G W F H b R G U W U K W eD H WH JI I D H X W � � N LN

�� ~ �� � �� � �� � � � � �� � # � � � � � � � � � 0� � � � � � � � � � �

0

2000

4000

6000

8000

10000

12000

-0.2 -0.1 0 0.1 0.20

2000

4000

6000

8000

10000

12000

14000

-4 -2 0 2 4

X position resolution

Data

4525. / 57Constant 9689.Mean 0.2476E-03Sigma 0.5058E-01

(cm) X pull distribution

4226. / 57Constant 0.1227E+05Mean 0.2656E-02Sigma 1.004

(std.dev.)

X position resolution vs. E E (GeV)

∆X (

cm)

∆X=0.20cm/√E(GeV)∆X=0.22cm/√E(GeV)∆X=0.24cm/√E(GeV)

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30

0

500

1000

1500

2000

2500

-0.2 -0.1 0 0.1 0.20

500

1000

1500

2000

2500

3000

-4 -2 0 2 4

X position resolution

Monte Carlo

1022. / 57Constant 1956.Mean 0.3127E-03Sigma 0.4985E-01

(cm) X pull distribution

956.7 / 57Constant 2473.Mean 0.5641E-02Sigma 0.9910

(std.dev.)

X position resolution vs. E E (GeV)∆X

(cm

)

∆X=0.20cm/√E(GeV)∆X=0.22cm/√E(GeV)∆X=0.24cm/√E(GeV)

-0.1

-0.08

-0.06

-0.04

-0.02

0

0.02

0.04

0.06

0.08

0.1

5 7.5 10 12.5 15 17.5 20 22.5 25 27.5 30

� �� + �+ �. � 5 < ; 7 0 6 : ;1 % �� � � % �� �� 0 7 7 = % �� � � % �� � > � = �� �4 � > � � � 5� � > 3 1 2 51 59 @ �2 5 51 2 51 � 5 ; 8 6 A 5 9 5 < ; 7 0 6 :; 1 8; 9 23 6 3 = 6 ; > 3 1 2C ;1 6 5 � 3 9 7 ; =? ; 6 6 ;4 > D

� � � �� � � � � �� �� � �� � �� � � � � ��

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0.05

5.5 6 6.5 7 7.5 8 8.5 9 9.5

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

5.5 6 6.5 7 7.5 8 8.5 9 9.5

X position bias vs. X

Data

X (cm)

∆X (

cm)

bias: ±300µm

X position resolution vs. X X (cm)

∆X (

cm)

resolution: ±1mm

5-10 GeV 10-15 GeV 15-20 GeV 20-25 GeV 25-30 GeV

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

0.03

0.04

0.05

5.5 6 6.5 7 7.5 8 8.5 9 9.5

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

5.5 6 6.5 7 7.5 8 8.5 9 9.5

X position bias vs. X

Monte Carlo

X (cm)

∆X (

cm)

bias: ±300µm

X position resolution vs. X X (cm)

∆X (

cm)

resolution: ±1mm

5-10 GeV 10-15 GeV 15-20 GeV 20-25 GeV 25-30 GeV

� �� + �+ #. �1 59 @ � 3 1 2 ; < : 6 : ;1 2 5 51 2 51 � 5 ; 8? :3 < 3 1 2 9 5 < ; 7 0 6 : ;1 ; 8 6 A 5 ; < : 6 : ;1 9 5 �; 1 < 6 9 0 � 6 : ;1 8; 9 23 6 3 = 6 ; > 3 1 2C ;1 6 5 � 3 9 7 ; =? ; 6 6 ;4 > D

�� ~ �� � �� � �� � � � � �� � # � � � � � � � � � 0� � � � � � � � � � �

-3

-2

-1

0

1

2

3

4 6 8 10

X BPT [cm]

Y B

PT [c

m]

Y deviation (times 10)

Z = -265.85 cm; E = 25 GeV

X BPT [cm]

Y B

PT [c

m]

X deviation (times 10)

-3

-2

-1

0

1

2

3

4 6 8 10

� �� + �+ �. A 5 5 � 5 � 6 ; 8 6 A 54 3 @ 1 5 6 : � � 5 7 2 ; 1 6 A 5 :4 3 � 6 ; :1 6 ; 8 3 � � 5� 5 7 5 � 6 9 ;1 ;1 6 A 5=1 ; 1 5� : < 6 :1 @ > � � 73 1 5 � D B A ;+ 1 3 9 5 6 A 5 2 5� :3 6 :; 1 < :1 � = 7 5 8 6 > 3 1 2 % = 9 :@ A 6 > 89 ;4 6 A 56 9 3 3 5 � 6 ; 9 � + : 6 A ; 0 64 3 @ 1 5 6 : � � 5 7 2� < �3 7 5 2? � 3 83 � 6 ; 9 ; 8 6 51 D

%

j r� j r ¡

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Data Monte Carlo

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T [ VPR V^ X ]© X T [ [ T Tb ^ X ¢ P X PR Y¢ ]P� TQ O [Q fR Tb R P^ _� ^ R [ OU _PQ ^ R P R Pb T `P ]© OX TR ]PR X T [ [ TQ � T O _[ VP R PU TX Q [R WU [ O TX T f V^ ]R TX OU ¦X^ _dcQ [^ [ P� W^ X [ O [ OPQ k � VP P ¨PU [ T f _ T\ PR OX Y [ VP X T OQ PU W [Q TX [ VP

! �^ X^ _¢Q OQ OQ ]OQU WQ Q P ] OX Q PU [ O TX �k ok �k

� � � � � �� � & '� % � � % �& ' � *� & � % � (

� VP Q Ob � _PQ [U V T OU P T f ¦X^ _Q [^ [ P T Z «PU [Q ^ R P U ^ _ TR Ob P [ PR U P _ _Q k � VPU ^ _ TR Ob P [ PR ]P [ PU [Q Z T [ V

X P W [R ^ _^ X ]U V^ R YP ]� ^ R [ OU _PQ ^ X ]b P^ Q WR PQ [ VP OR P X PR Y¢© 9� V T\ P `PR \ O [ V^ R PQ T _ W [ O TX ]P YR ^ ]OX Y^ [Q b ^ _ _P X PR YOPQ k � VOQ ^ _ Y TR O [ Vb V^ Q ZP P X [ VP Q [^ X ]^ R ]b P [ V T ] OX [ VP � ^ Q [ ¢ P^ R Q OX ­ s i �k�X [ VP U TX [ P ª [ T f ]O ¨R ^ U [ O `P � V¢Q OU Q ^ X^ _¢Q PQ © [ VP­ i S � 9 9 � o � o© o � u �^ _ Y TR O [ Vb V^ Q ZP P X]P `P _ T� P ]k ­ i S � �Q U Tb ZOX P ¡� N^ X ] ¡ m¥ b P^ Q WR Pb P X [Q © Z¢^ Q Q O YX OX Y [R ^ U gQ [ T P X PR Y¢ ]P c� TQ O [Q ^ X ] OX fPR R OX Y [ VP R P _P `^ X [� W^ X [ O [ OPQ T f [ VPU Tb ZOX P ] T Z «PU [Q fR Tb P O [ VPR ¡� N TR ¡ m¥©]P� P X ]OX Y TX U PR [^ OX � W^ _O [ ¢U R O [ PR O^ ^ X ] [ VP [R ^ ]P c T ¨ ZP [\ P P X [ VP ]O ¨PR P X [ _¢ P X PR Y¢ c ]P� P X ]P X [R PQ T _ W [ O TX Q T f ¡ m¥^ X ] ¡� Nk �� PU O^ _U ^ R P OQ [^ gP X OX TR ]PR [ T^ ` T O ] ] T W Z _P cU T WX [ OX Y T f� ^ R [ OU _PQ kSTR ^ X^ _¢Q PQ OX VO Y Vdc � �� V¢Q OU Q © [ VP ¡ � q m e N ¡ i� � o � � �^ _ Y TR O [ Vb V^ Q ZP P X � R T� TQ P ]© \ VOU V

^ Ob Q ^ [R Pb T `OX Y Z^ U gQ � _^ Q V© Ok Pk P X PR Y ¢ ]P� TQ O [Q fR Tb Z^ U gQU ^ [ [ PR P ] TR ]P �PU [ P ]� ^ R [ OU _PQ \ VOU V

b Ob OU gP X PR Y¢ � T\ OX ]OR PU [ O TX Q OX [ T \ VOU VX T� ^ R [ OU _PQ V^ `P Pb PR YP ] fR Tb [ VP � R Ob ^ R ¢ `PR [ P ªkm f[ PR [ VOQ U _P^ X OX YQ [ P� © P O [ VPR ^ U P _ _dc Z^ Q P ] TR ^ ­ i S �R PU TX Q [R WU [ O TX U ^ X ZP � PR fTR b P ]k �OXU P[ VP V^ ]R TX OU ^ U [ O `O [ ¢ OX P `P X [Q ^ [ _ T\ � � OQ [ ¢� OU ^ _ _¢ Q b ^ _ _© Z^ U gQ � _^ Q V OQ X TQ O YX O ¦U ^ X [� R T Z _PbOX Q WU VP `P X [Q km _ _R PU TX Q [R WU [ O TX b P [ V T ]Q \ PR P Q [ W ]OP ] fTR [ VOQ ^ X^ _¢Q OQ k ­ i S � �Q \ PR P fT WX ] [ T YO `P [ VPZPQ [R PQ T _ W [ O TX ^ X ]^ _Q T [ VP ZPQ [^ YR P Pb P X [ ZP [\ P P X ]^ [^ ^ X ] a ¡6 [ VOQ R PU TX Q [R WU [ O TX b P [ V T ]OQ [ VPR P fTR P WQ P ]k

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� VP b TQ [ Ob � TR [^ X [� W^ X [ O [ ¢ T f [ VP V^ ]R TX OU ¦X^ _Q [^ [ P P X [ PR OX Y OX [ VP^ X^ _¢Q OQ OQ

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: � � o �U TQ � � � 5 � �k o � �

\ VPR P [ VP Q Wb R W X Q T `PR ^ _ _ V^ ]R TX OU ¦X^ _Q [^ [ P T Z «PU [Q \ O [ VP X PR Y¢ : �R PU TX Q [R WU [ P ]^ [^ � T _^ R^ X Y _P � � � [^ gOX Y OX [ T^ U U T WX [ [ VP P `P X [ `PR [ P ª^ Q R PU TX Q [R WU [ P ] Z¢ [ VP j r� �k ��� � � OQ U _ TQ P _¢R P _^ [ P ] [ T

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�X P^ _Q T ]P ¦X PQ

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: �Q OX � �U TQ � � � �k op �

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: �Q OX � �Q OX � � � �k u§ �

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: �U TQ � � � �k u o �

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^ X ]© [ T YP [ VPR \ O [ V [ VP QU ^ [ [ PR P ] P _PU [R TX P X PR Y¢ : '� ^ X ]^ X Y _P �©

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B� � � bD I G HD R GT WH F U JH XQ R F H UNB B � � � C R H W XD H G W =D X �i WH K F f �D b G g J ` U F � � � � D HD T K i � F d F f �D b G �N

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¥ TX YO [ W ]OX^ _b Tb P X [ Wb U TX Q PR `^ [ O TX R P� W OR PQ � . u :� . � � ¤P ¬ fTR fW _ _¢U TX [^ OX P ]^ X ]� PR cfPU [ _¢ b P^ Q WR P ]P `P X [Q k STR [ VP ^ X^ _¢Q OQ T f � � qP `P X [Q © O [ OQ U TX `P X OP X [ [ TR P� _^ U P � Z¢

� ' . � � u : � � � � 5 � �k u � �

\ VPR P : � � � � OQ [ VP P X PR Y¢ T f [ VP R ^ ]O^ [ P ]� V T [ TX ^ Q b P^ Q WR P ] OX [ VP � V T [ TX U ^ _ TR Ob P [ PR T f[ VP ¥ i a� Q ¢Q [ Pb k � VP � T _^ R ^ X Y _P T f [ VP V^ ]R TX OU Q ¢Q [ Pb © \ VOU V OX [ VP � W^ R gdc� ^ R [ TX b T ]P _

U T OXU O ]PQ \ O [ V [ VP ^ X Y _P T f [ VP Q [R WU g� W^ R g© OQ U ^ _U W _^ [ P ]^ Q

U TQ� � � � . � �� �� � � � � �� � �� �� �� � � � � �� � � / � �k u � �

� � ! ,# � "� $ , * � "�# $! � *% # � $! * $ ,% #

SR Tb [ VP QU ^ [ [ PR P ]P _PU [R TX ^ X ] [ VP V^ ]R TX OU ¦X^ _Q [^ [ P© fT WR OX ]P� P X ]P X [b P^ Q WR P ]� W^ X [ O [ OPQU ^ X ZP ]PR O `P ] OX [ T [^ _k � VPQ PU ^ X ZPU V TQ P X© fTR P ª^ b � _P© [ T ZP P X PR Y¢ : '� ^ X ]^ X Y _P � T f [ VPP _PU [R TX© ^ X ] ��� � �^ X ] �� �� � � � T f [ VP V^ ]R TX Q k � VPU V T OU P T f V^ ]R TX OU `^ R O^ Z _PQ OQ b T [ O `^ [ P ] Z¢[ VP ]PQ OR P [ T ZP OX ]P� P X ]P X [ T f� ^ R [ OU _P _ TQ Q OX _ TX YO [ W ]OX^ _ � fTR \ ^ R ] � ]OR PU [ O TXkSR Tb [ VPQ P fT WR � W^ X [ O [ OPQ © [\ T OX ]P� P X ]P X [ ¥ TR P X [ £ c OX `^ R O^ X [� W^ X [ O [ OPQ ^ R P [ T ZPU ^ _U W _^ [ P ]©\ VOU V^ R P WQ W^ _ _¢U V TQ P X [ T ZP 1^ X ] � � � TR '^ X ] � � �k ¡ TX Q P� W P X [ _¢© [ VP Q ¢Q [ Pb OQ T `PR ]P [ PR cb OX P ]^ X ] [ VPR P ^ R P ]O ¨PR P X [� TQ Q O ZO _O [ OPQ [ TU V T TQ P [\ T T W [ T f [ VP fT WR b P^ Q WR P ]� W^ X [ O [ OPQ [ TR PU TX Q [R WU [ [ VP ¥ TR P X [ £ c OX `^ R O^ X [Q k �X PU ^ X ^ _Q TU V T TQ P b TR P [ V^ X [\ T T f [ VPb ^ X ]b O ª [ VPb ke T [^ _ _U Tb ZOX^ [ O TX Q ^ R P � ^ R [ OU W _^ R _¢ WQ P fW _6 [ VP fT _ _ T\ OX Y TX PQ ^ R P OX \ O ]PQ � R P^ ] WQ Pk

��� � � � � *� � % & ' ( � % �& )

± O [ V [ VP P _PU [R TX b P [ V T ] � o � � �© [ VP gOX Pb ^ [ OU `^ R O^ Z _PQ ^ R P R PU TX Q [R WU [ P ] fR Tb b P^ Q WR P ]� W^ X c[ O [ OPQ T f [ VP QU ^ [ [ PR P ] P _PU [R TX TX _¢k � VOQ b P [ V T ]\ ^ Q [R ^ ]O [ O TX^ _ _¢ WQ P ] OX ¦ª P ] [^ R YP [ P ª� PR cOb P X [Q ^ X ] V^ Q [ VP W X O� W P ^ ] `^ X [^ YP T f ZP OX Y [ T [^ _ _¢ OX ]P� P X ]P X [ T f [ VP V^ ]R TX OU ¦X^ _Q [^ [ Pk� [Q R PQ T _ W [ O TX OQ Y T T ]^ Z T `P ' @ § / o© Z W [ ]P [ PR O TR ^ [ PQ fTR _ T\ PR 'k �X [ VOQ ^ X^ _¢Q OQ © [ VP P _PU [R TXb P [ V T ] OQ WQ P ]^ [ ' § / § �k � VP fTR b W _^ P ^ R P© T fU T WR Q P© O ]P X [ OU ^ _ [ T s� Q k � uk o � �^ X ] � uk op �k:� ^ X ] : '� ]P X T [ P [ VP P X PR Y¢ T f [ VP OXU Tb OX Y^ X ]QU ^ [ [ PR P ]P _PU [R TXl© � O [Q QU ^ [ [ PR OX Y^ X Y _P \ O [ V

R PQ � PU [ [ T [ VP fTR \ ^ R ] ]OR PU [ O TXlk� �� . u :� : '� � o �U TQ � � � �k u � �

'� . o � : '� u :� � o �U TQ � �7/ � �k u � �

��� � � � � & � � *� � '� *� ( � % �& )

� VP ] T W Z _P ^ X Y _P b P [ V T ] � o � � � WQ PQ [ VP ^ X Y _P T f [ VP QU ^ [ [ PR P ] P _PU [R TX ^ X ] [ VP ^ X Y _P� T f [ VPQU ^ [ [ PR P ]� W^ R g �R PU TX Q [R WU [ P ] fR Tb [ VP ¦X^ _Q [^ [ P V^ ]R TX Q �k

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Q OX� �Q OX � �Q OX � � �� � � �k u � �

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Q OX� �Q OX � �Q OX � � �� � / � �k up �

��� � � � � �� �� � % " � *& ' ) � * ( � % �& )

� VOQ b P [ V T ]© � R T� TQ P ] Z¢ �^ U � W P [^ X ] j _ TX ]P _ � o � � �© WQ PQ TX _¢ [ VP V^ ]R TX OU ¦X^ _Q [^ [ P [ TR PU TX Q [R WU [ [ VP gOX Pb ^ [ OU Q k �X Q [R WU [ WR P fW XU [ O TX ^ X^ _¢Q PQ © '� � OQ T f[ P X WQ P ] [ T R P ] WU P P `P X [

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b O YR ^ [ O TX fR Tb _ T\ '© \ VPR P O [ V^ Q ^ Y T T ]R PQ T _ W [ O TXk

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� � � � � � � � ( � + � / ( � % �& )

� VP � b P [ V T ] � o � � � [R OPQ [ T WX O [ P [ VP `PR ¢ Y T T ]R PQ T _ W [ O TX T f [ VP P _PU [R TX b P [ V T ]^ [ VO Y V '^ X ][ VP Q W� PR O TR R PQ T _ W [ O TX T f [ VP �^ U � W P [ c j _ TX ]P _b P [ V T ]^ [ _ T\ 'k �X ^ ] ]O [ O TXl© [ VP `^ R O^ Z _PQ '�^ X ] � ��^ R PU TX Q [R WU [ P ]Q WU V [ V^ [ [ VP ¢^ R P OX Q P X Q O [ O `P [ T OX O [ O^ _Q [^ [ P R ^ ]O^ [ O TX© Ok Pk OX U TX [R ^ Q [[ T T [ VPR R PU TX Q [R WU [ O TX b P [ V T ]Q © [ VP P� W^ [ O TX Q ] T X T [U V^ X YP OX U ^ Q P T f � � qk

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� VP � � b P [ V T ] � o � � � OQ ^ b O ª [ WR P T f [ VP P _PU [R TX ^ X ] [ VP � b P [ V T ]k � [ WQ PQ � �� ^ X ] '�© [ VWQb ^ gOX Y T� [ Ob Wb WQ P T f [ VP ^ `^ O _^ Z _P R PQ T _ W [ O TX© Z W [ YO `OX Y W� [ VP OX Q P X Q O [ O `O [ ¢ [ T � � q OX � �k

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' � � . '� / � �k � � �

� � � � � � *� � % & '" � � � ( � +�� � / ( � % �& )

¥ O gP [ VP � � b P [ V T ]© [ VP � � b P [ V T ] � o � � � OQ ^ b O ª [ WR P T f [ VP P _PU [R TX ^ X ] [ VP � b P [ V T ]k � [^ ] ]O [ O TX^ _ _ ¢ R PQU ^ _PQ '�k

� �� � . � �� � �k � � �

'� � . '�� �� � �� / � �k � � �

m [ _ T\ '© [ VP � � ^ X ]� � b P [ V T ]Q ZPU Tb P OX ]OQ [ OX Y W OQ V^ Z _Pk m [ VO Y V '© [ VP R PQ T _ W [ O TX T f [ VP� � OQ Q W� PR O TR [ T [ V^ [ T f [ VP � � b P [ V T ]k �X [ VOQ ^ X^ _¢Q OQ © [ VP� � b P [ V T ] OQ WQ P ]^ [ ' A § / § �k

� � � � � ��� & * � % �& '�

� VP PR R TR Q T f [ VP R PU TX Q [R WU [ P ] gOX Pb ^ [ OU `^ R O^ Z _PQ ] W P [ TR PQ T _ W [ O TX Q TR Q ¢Q [ Pb ^ [ OU WXU PR [^ OX [ OPQT f [ VP R PU TX Q [R WU [ P ] `^ R O^ Z _PQ : '� © � . � � �^ X ] ��� � �^ R P YO `P X � fTR Q b ^ _ _QU ^ [ [ PR OX Y^ X Y _PQ � � Z¢

� � � �� �� �� . / � � : '� �: '�

0 � u / � � � �� 0 � �k � � �

� � '� �'� . � o � o � '� � / � � : '� �: '�

0 � � o � o � '� � ! � �u"2 / � � � �� 0 � �k �p �

� � � �� � �� �� �

. / � � : '� �: '�

0 � u / � � � �� 0 � �k �§ �

� � '� � �'� �

. u � '� � � o � / � � : '� �: '�

0 � � � '� � � o � / � � � �� 0 � � o � u '� � � / � ���� � � ��� � �0 � �k � o �

�� � , �� � �� � � � � & � � � � � � �� � �� � � � � �� � �

0

10

20

30

40

50

60

70

0 0.2 0.4 0.6 0.80

10

20

30

40

50

60

70

10-2

10-1

0

2

4

6

8

10

12

14

0 0.2 0.4 0.6 0.80

2

4

6

8

10

12

14

10-2

10-1

y

σ(y)

/y (

%)

y

σ(y)

/y (

%)

y

σ(Q

2 )/Q

2 (%

)

y

σ(Q

2 )/Q

2 (%

)

total E term θ term δ term

electron method eΣ method

� �� + �+ - 0. � ; 1 6 9 :? 0 6 :; 1 < 6 ; 6 A 5 9 5 < ; 7 0 6 : ; 1 < ; 8 � � 3 1 2� 89 ;4 6 A 5 9 5 < ; 7 0 6 : ;1 ; 8 51 59 @ � � 3 1 @ 7 53 1 2 A3 2 9 ;1 : � �1 3 7 < 6 3 6 5 9 5 �; 1 < 6 9 0 � 6 :; 1 � 8; 9 6 A 5 5 7 5 � 6 9 ; 1 3 1 2 6 A 5 � �4 5 6 A ; 2 3 < 801 � 6 : ;1 < ; 8

� D ; 6 5 6 A 5 � A3 1 @ 5 89 ;4 7 :1 53 9 6 ; 7; @ 3 9 : 6 A4 : �� < �3 7 5 D � 9 9 ;+ < :1 2 : �3 6 5 6 A 5 9 5@ : ;1 + A 5 9 5 6 A 59 5 < 5 � 6 :� 54 5 6 A ; 2 : < 0 < 5 2 D

00.5

11.5

22.5

33.5

44.5

5

0 0.2 0.4 0.6 0.80

0.51

1.52

2.53

3.54

4.55

10-2

10-1

00.10.20.30.40.50.60.70.80.9

1

0 0.2 0.4 0.6 0.80

0.10.20.30.40.50.60.70.80.9

1

10-2

10-1

y

σ(y)

/y (

%)

y

σ(y)

/y (

%)

y

σ(Q

2 )/Q

2 (%

)

y

σ(Q

2 )/Q

2 (%

)

total E term θ term δ term

electron method eΣ method

� �� + �+ - �. B 34 5 3 < / :@ D � D � � 1 ;+ � ;1 6 9 :? 0 6 : ;1 < 6 ; 6 A 5 < � < 6 54 3 6 : � 01 � 59 6 3 :1 6� :1 � � 3 1 2�89 ;4 51 5 9 @ � �3 7 :? 9 3 6 :; 1 3 1 2 3 7 :@ 1 4 51 6 D

� � � �� � � � � �� �� � �� � �� � � � � ��

fTR [ VP P _PU [R TX ^ X ] [ VP � � b P [ V T ] � fTR ^ U Tb � _P [ P _OQ [ OX Y T fR PQ T _ W [ O TX fTR b W _^ P Q P P � o � � � �ke T [ P [ V^ [ � �� ^ X ] � �� �^ R P O ]P X [ OU ^ _k �X SO Yk �k o �^ U Tb � ^ R OQ TX OQ Q V T\ X Z^ Q P ] TX [ VP fT _ _ T\ OX Y^ � � R T ª Ob ^ [ O TX Q T f ]P [ PU [ TR R PQ T _ W [ O TX Qn

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0.1

0.2

10-6

10-5

0

0.1

0.2

10-6

10-5

0

0.1

0.2

0.3

10-6

10-50

0.1

0.2

0.3

10-6

10-5

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x

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x

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E665

ZEUS REGGE 97

ZEUS 1997 (Preliminary)

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0.3

0.4

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10-4

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0.2

0.3

0.4

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10-4

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0.4

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10-4

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0.2

0.4

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10-4

10-3

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0.2

0.4

0.6

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10-4

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x

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x

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E665

ZEUS REGGE 97

ZEUS 1997 (Preliminary)

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CKMTBKALLM

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CKMTBKALLM

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CKMT98MRSALLM97

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E665 ZEUS+H1 94-95 ZEUS+H1 γp

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DLDL98ALLM97

ZEUS 1997 (Preliminary)

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1997

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1 94-95 Z

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�H U� U K � � LT K R $ MP L

@� �� ' ?. � $ K R $ M 3 L � � K R $ MP L� � � � � + � �( � � � � � � � i � EO � - �� � � �� '� �� �� ��� � � � � � �� � �� � �� �� �� � � � � � �� H U� U $ ��� �� ,� � �� �� � � � � � - � � i � � � � �� � �� � � �� ,���� �� � { | � * �� � � � � � �� + �� H � �� �- � �S$ � $ � �� � � � E � � � �� � '� $# �� � � � � + � B� � � �� �� � � $# � �� � � � � � � ��� � � � � � � � � . � � � � �� �� � � H U� U K � � L ��� H N � + �� � �� � � � '�MP { � |T T T M JO { � | K H 3 � � � � � �� �� � � L $ # � � ��� � � � � � � � �� � �� �� � � '$ R $ H R � �� �� � � �� # + �� R $ M $ ��� � � � �� � �( � � � � � �� � � +� � � '� � � '� ' � �� i �� +� � � � � ���

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10 2

10 3

0 0.2 0.4 0.6 0.8

W=25 GeV (× 1)

W=36 GeV (× 1.2)

W=47 GeV (× 1.5)

W=67 GeV (× 1.8)

W=104 GeV (× 2.3)

W=134 GeV (× 2.8)

W=153 GeV (× 3.5)

W=172 GeV (× 4.4)

W=189 GeV (× 5.7)

W=212 GeV (× 7.3)

W=232 GeV (× 9.4)

W=251 GeV (× 12.1)

W=270 GeV (× 15.1)

Q2 (GeV2)

σ tot

γ*p (

µb)

(sca

led) measured γ*p cross section

extrapolated γp cross section

ZEUS 1997 (Preliminary)

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DLM DLM DLM DL98 DL98 DL98 ALLM97 ALLM97 ALLM97 CKMT98 CKMT98 CKMT98 DL DL DL

BPT 1997 (this analysis)ZEUS SVX 1995 and 1996/97 (unofficial)

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BPT 1997 (this analysis)

ZEUS REGGE 97

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