Sterile neutrino oscillations in MINOS and hadron production in pC collisions Page: 93 of 237
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4.3 The drift calibration
- Whole detector - Whole detector
0 -C 55 eeco 0
- - Far Detector - Supermodule 1 (D Far Detector - Supermodule 1
- Supermodule 2 - Supermodule 2
500 - -500
U 450 - - 450 --
002/07/05 31/12/05 02/07/06 31/12/06 02/07/07 C 01/01/04 31/12/05 0 10
Date (points 1 day apart) Date (points 1 day apart)
Figure 4.7: The median detector response for the whole detector and for the two super-
modules after applying the linearity and the drift corrections (left) and after applying the
linearity, the drift and the strip-to-strip corrections (right). Linearity and drift correc-
tions remove ageing and temperature effects. The strip-to-strip correction removes spatial
average constant for the detector might affect the energy resolution, but does not create an
energy scale systematic error.
4.3.3 The drift calibration systematic errors
The full drift calibration constants are used to calibrated the detectors to the same MEU
scale as explained in section 4.2.1. By construction, randomly wrong drift calibration
constants would not affect the MEU calculation, but would have an impact only on the
energy resolution. The only way the drift constants can have an effect on the MEU number
evaluation is if the drift constants show a time dependent systematic error. Indeed, if this
is the case, the errors would not cancel out.
Successive steps in the calibration chain are calibrated using the mean pulse height per
plane instead of the median pulse height per plane. Thus, it is important to cross-check
the consistency between the two variables. The systematic errors on the drift calibration
are evaluated by comparing the correction factor M in equation (4.8) as obtained by the
median to the correction factor obtained by choosing the mean as the drift constant 2.
To evaluate the ratio between the two correction factors, we need to normalise the reference
constants miuo and m'o to the same physics. While a complete freedom in the choice of the
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Tinti, Gemma Maria & U., /Oxford. Sterile neutrino oscillations in MINOS and hadron production in pC collisions, thesis or dissertation, July 1, 2010; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1015233/m1/93/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.