10 - H1 - Desy

14 Theoretical framework
F 2
⋅ 2 i
10 5
x = 0.000050, i = 21
x = 0.000080, i = 20
x = 0.00013, i = 19
x = 0.00020, i = 18
x = 0.00032, i = 17
x = 0.00050, i = 16
x = 0.00080, i = 15
H1 e + p high Q 2
94-00
H1 e + p low Q 2
96-97
10 4
x = 0.0013, i = 14
x = 0.0020, i = 13
x = 0.0032, i = 12
BCDMS
NMC
10 3
10 2
10
1
x = 0.25, i = 2
10 -1
x = 0.40, i = 1
10 -2
10 -3
10 6 1 10 10 2 10 3 10 4 10 5
x = 0.0050, i = 11
x = 0.0080, i = 10
x = 0.013, i = 9
x = 0.020, i = 8
x = 0.032, i = 7
x = 0.050, i = 6
x = 0.080, i = 5
x = 0.13, i = 4
x = 0.18, i = 3
H1 PDF 2000
extrapolation
x = 0.65, i = 0
H1 Collaboration
Q 2 / GeV 2
Figure 1.9: The proton structure function F 2 as a function of Q 2 for different values of
x measured by the H1 collaboration and the fixed target experiments BCDMS and NMC.
The results are compared with the corresponding Standard Model expectation determined
from the H1 PDF 2000 fit indicated by the error bands. The figure is taken from [25].
The fine structure constant is denoted as α and Q 2 min = m2 ey
is the kinematic lower limit.
1−y
The maximum photon virtuality Q 2 max is given by the scattered electron energy E e ′ and
angle θ e :
Q 2 max = 2E eE ′ e (1 + cosθ e), (1.29)
with the energy of the incoming electron denoted as E e .