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Charm production at HERA
Proceedings of ICHEP 2002, pp. 325–328 S. Bentvelsen, P. de Jong, J. Koch and E. Laenen (Editors)
ELSEVIER
31st INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS AMSTERDAM
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c 2003 Elsevier Science B.V. All rights reserved. doi:10.1016/S0920-5632(02)02174-6
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ZEUS (prel.) 98-00 a)
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150
200
250 W (GeV)
0
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0.4
0.6
0.8 1 * z(D )
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%
$ 2 2 2 5 .(/0 '- .(/0 2 2 E F 68 F 68 6C8 ) 2% 3 2 # # 2 % 1 2 2 E = =:B = ==: % % '- 5 6:8 % 2 2 ! $3 $ % " 2 2
327
Charm production at HERA
10000
5000
100
50
-1
10
CST life time tag: Sl > 8
0
1.7
2
1.8
1
-2
10
H1 prel
2
10
-1
2
-1
10
dσvis / dQ [ nb / GeV ]
dσvis / dpt [ nb / GeV/c ]
- + +
10
10 2.5
5
-2
10 2
10
10
10 2
+
Q
1
dσvis / dy [ nb ]
H1 prel
0
5
10
15
20 25 2 pT (GeV2)
H1 CS+CO HO improved , x3 CS+CO LO CS LO CS+CO LO resolved
-3
pt(D ) [ GeV/c ]
dσvis / dη [ nb ]
2
m(Kππ) [ GeV/c ]
m(Kππ) [ GeV/c ] +
1.9
2
2
D →Kπ π H1 prel
0.4 < z < 0.9 -2
10
d σ / d z [nb]
1.9
KZSZ (LO, CS)
1
no CST life time tag 1.8
ZEUS 96-97 KZSZ (NLO, CS) 0.117 < αs(MZ) < 0.121 1.3 < mc < 1.6 GeV
10
Fit
0
1.7
2
H1 prel
2
15000
dσ/dpT2 (nb/GeV )
[ candidates / 20 MeV/c ]
D →Kπ π
2
[ candidates / 20 MeV/c ]
ZEUS - + +
+
10
2
2
2
[ GeV ]
H1 prel AROMA (LO)
7.5
c + 4.3⋅b 4.3⋅b
10
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0
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ELSEVIER
31st INTERNATIONAL CONFERENCE ON HIGH ENERGY PHYSICS AMSTERDAM
!" # $%
! " # $%& ' ' ! ( ' ! ($%&) ! ' # ' !
& ' ( ) ( *+, -. ( ' ' ' $ $ ( /0 1 2 ( 2 ' 3 4 ' +
( 22 ' 2'' ' 5 ¾ 6 ¾ 2 ( 6 * , 2 784 2 6 ¾ *9 ,3 2'' ' ½ ( 3 22' 5 ( ¾ 6 ¾ ¾ 3 :; :9; 2 !!< 9 $ 22' 6 "
= "
= 4 ' ' 2 *¾ ,
*0 ¾ ,3
½
c 2003 Elsevier Science B.V. All rights reserved. doi:10.1016/S0920-5632(02)02174-6
' ( /0 * /0,3 . -. ' 5 4 ' *7 +, > $ ( '2 ' 2 > 3 2 ( $ 2 3 $ ( ?& ( $ 2 @ 5 3 ( 5 4 A B 3 3 @ $ ' ( A B C 3 & /0 D?&
:"; $ @1 *+& , /0 $ ' 2 ( ' 5 43 ' (
1 4 $ 2 '' 3 - '
1 ' ( 3 2 A' B *+&D??, :E; ' ' +&2 12 2 *D??, '3
¾ 326
C. Grab
5 .(/0 678 % - 2 - 9 4 - : - ; <= 9 ->= 8 @ 6B8 * .(/0 % @ % ' % % 2 @ 2 % , 2 % $ '- 2 !*0 6:8 B? 2 3 -;;; <=== * 2 2 2 , '(&" 2 2 2 % 1 3 $ < % % % % 1 , $ 5 2 < 2 3 2 < -== 9 = =7 = C - 7 < 7 9
¾ ¾
dσ/dη (nb)
1
14
b)
12 10 8
-1
10
6 -2
4 NLO QCD FONLL
10 5
10
2 0
15 20 * pT(D ) (GeV)
0.3 c) 0.25 0.2
dσ/dz (nb)
-3
dσ/dW (nb/GeV)
, '- .(/0 1 2 3 4
ZEUS (prel.) 98-00 a)
10
10
¾
ZEUS dσ/dpT (nb/GeV)
!"# $ % "& " '(&)* #+'*"
10
-1
0
1 * η(D )
2
d)
0.15 10 0.1 0.05 0
150
200
250 W (GeV)
0
0.2
0.4
0.6
0.8 1 * z(D )
- 0 5 % @ A ! D 2 A ! @ % 2 @ A ! " < 3 %
%
$ 2 2 2 5 .(/0 '- .(/0 2 2 E F 68 F 68 6C8 ) 2% 3 2 # # 2 % 1 2 2 E = =:B = ==: % % '- 5 6:8 % 2 2 ! $3 $ % " 2 2
327
Charm production at HERA
10000
5000
100
50
-1
10
CST life time tag: Sl > 8
0
1.7
2
1.8
1
-2
10
H1 prel
2
10
-1
2
-1
10
dσvis / dQ [ nb / GeV ]
dσvis / dpt [ nb / GeV/c ]
- + +
10
10 2.5
5
-2
10 2
10
10
10 2
+
Q
1
dσvis / dy [ nb ]
H1 prel
0
5
10
15
20 25 2 pT (GeV2)
H1 CS+CO HO improved , x3 CS+CO LO CS LO CS+CO LO resolved
-3
pt(D ) [ GeV/c ]
dσvis / dη [ nb ]
2
m(Kππ) [ GeV/c ]
m(Kππ) [ GeV/c ] +
1.9
2
2
D →Kπ π H1 prel
0.4 < z < 0.9 -2
10
d σ / d z [nb]
1.9
KZSZ (LO, CS)
1
no CST life time tag 1.8
ZEUS 96-97 KZSZ (NLO, CS) 0.117 < αs(MZ) < 0.121 1.3 < mc < 1.6 GeV
10
Fit
0
1.7
2
H1 prel
2
15000
dσ/dpT2 (nb/GeV )
[ candidates / 20 MeV/c ]
D →Kπ π
2
[ candidates / 20 MeV/c ]
ZEUS - + +
+
10
2
2
2
[ GeV ]
H1 prel AROMA (LO)
7.5
c + 4.3⋅b 4.3⋅b
10
5
0
0.5
0.1
0.2
0.3
0.4
0.5
0.6
0.7
2.5
0.9 z
0
0
-1.5
-0.75
0
0.75 1.5 + η(D )
0.2
0.4
0.6 y
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&%* ->>%. 2 EF ->>&. ? 2 " 2 EF 3 )= >&$11% ->>%. 5 "35 *1 ->>?. 2 EF B B 0 B -?11.G % " 4 3 )=$1?8%> ?11? & " 4 3 )=$1?8&1 ?11? * ' () **% :" B ! ?11?