NA62 TD Document
1.1 CEDAR
1.1.1 CEDAR Detector Requirements
This is an example paragraph. The sensitivity of the experiment has already been investigated with
the configuration described in the proposal (1). However, the simulation used in that analysis had
simplifications reflecting the still approximate design of the various sub-detectors. Following the
changes and improvements achieved in the last two years in the general layout and in the subdetectors design, a more sophisticated simulation has been built and some crucial aspects of the
sensitivity re-analyzed. Particular attention has been paid to the variation of the background rejection
using the new spectrometer configuration with four straw chambers and one magnet only.
𝐾+ →
𝜋 + 𝜈𝜈̅ 
Figure 1 Shape of the M2 miss for signal and background events reconstructed from the generated kaon and charged decay
product three-momenta. The downstream track is assumed to be a pion, 92% of Kaon decays are kinematically constraint.
The signature of the 𝐾 + →
𝜋 + 𝜈𝜈̅ event is one track in the final state and nothing else. All the
other events having a similar signature are backgrounds (Table 1). Their rejection relies on the event
kinematics, on the veto of photons and on the particle identification. The kinematics of a one-track
event can be fully described using the M2miss defined as the square of the difference of the fourmomentum of the kaon and of the charged decay product under the assumption that it is a pion. Using
this variable two categories of background can be distinguished: one kinematically constrained, and
the other kinematically not constrained (see Figure 1).
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Table 1 This is an example Table. Branching ratios of background decay channels.
Decay
Branching Ratio
+
K K2)
+
+ 0
+
+ + -
+
 0 0
K   (K
K   
K   
0.64
0.21
0.07
This is a test paragraph written with normal style. This example shows a table (see Table 2)
Table 2 Example Table with Caption.
Detector
GTK
Fiducial Region
Anti0
Straw Tubes
RICH
Beam Dump
Length [m]
80
100
105
170
100
175
175
220
220
237
250
250
Z coord.
0
70
75
120
137
150
Figure 2 Schematic of the NA62 Experiment
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NA62 TD Document
1.1.2
Vessel and Internal Optics
1.1.3
Mechanics of the new Nose
1.1.4
Gas system
1.1.5
Light Transport System
1.1.6
Photon Detectors
1.1.7
Cooling
1.1.8
Readout/Trigger Electronics (ref to TDAQ chapter)
1.1.9
Calibration and Monitoring
1.1.10 DCS (ref to DCS chapter)
Bibliography
1. al., Mustermann et. This is the Title. s.l. : Internal Note, 2007. 1.
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