10 - H1 - Desy

166 List of Figures
3.1 Layout of the HERA collider. . . . . . . . . . . . . . . . . . . . . . . . . 40
3.2 HERA I and HERA II integrated luminosity as a function of time. . . . . 41
3.3 The H1 detector with its major components and the reference system. . . 42
3.4 A longitudinal view of the H1 tracking system including the central and
forward tracking detectors. . . . . . . . . . . . . . . . . . . . . . . . . . . 43
3.5 The structure of the CIP chamber. . . . . . . . . . . . . . . . . . . . . . 44
3.6 Longitudinal cross section of the Liquid Argon calorimeter showing its
segmentation into eight wheels. . . . . . . . . . . . . . . . . . . . . . . . 45
3.7 Longitudinal cross section of the Liquid Argon calorimeter showing lines
of constant radiation length 20X 0 and constant nuclear interaction length λ 46
3.8 Longitudinal and transversal cross section of the Liquid Argon calorimeter
illustrating the granulity of the readout system. . . . . . . . . . . . . . . 47
3.9 The H1 luminosity system. . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3.10 The designed data flow through the H1 trigger system. . . . . . . . . . . 49
4.1 Event yield for inclusive prompt photon selection. . . . . . . . . . . . . . 52
4.2 The θ distribution of LAr Big Towers. . . . . . . . . . . . . . . . . . . . . 55
4.3 Trigger rates relevant to prompt photon analysis. . . . . . . . . . . . . . 56
4.4 The trigger efficiency for 16 φ sectors as the function of zr variable. . . . 58
4.5 S67 trigger efficiency for the year 2006 and for six LAr calorimeter wheels.
The measured trigger efficiency is compared to the MC simulation. . . . . 59
4.6 Run averaged L4 rejection rate for events triggered by s67 for 2006/07
e + p data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4.7 S67 && L4 HS ET CLUST trigger efficiency for the year 2006 and for
six LAr calorimeter wheels. . . . . . . . . . . . . . . . . . . . . . . . . . . 61
5.1 Inelasticity estimator y distribution and the estimated DIS events fraction. 64
5.2 The electromagnetic energy fraction in the first two layers of LAr calorimeter
of photon clusters and hadron clusters. . . . . . . . . . . . . . . . . . 65
5.3 The difference between photon candidate cluster and the closest enabled
BT in pseudorapidity ∆η and azimuthal angle ∆φ. . . . . . . . . . . . . 66
5.4 The distribution of the z variable describing the isolation of the photon
candidate and the transverse radius R T distribution of the photon
candidates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
5.5 Distribution of pseudorapidity η γ and transverse energy E γ T
of the selected
prompt photon condidates. . . . . . . . . . . . . . . . . . . . . . . . . . . 68
5.6 The distribution of the pseudorapidity η jet and transverse energy E jet
T
of
the leading hadronic jet. . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.7 The distribution of the x LO
γ and x LO
p estimators. . . . . . . . . . . . . . . 69
5.8 The distribution of the ∆Φ and p ⊥ variables. . . . . . . . . . . . . . . . . 70
5.9 Inclusive prompt photon selection efficiency as a function of E γ T
and ηγ
for different cut sets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.1 Sketch of a calorimeter shower initialised by a single photon and a double
photon state originating from decay of π 0 . . . . . . . . . . . . . . . . . . 74