Non-oscillation physics Report of the WG M. Sioli, OPERA Collaboration Meeting, Mizunami,...
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![Page 1: Non-oscillation physics Report of the WG M. Sioli, OPERA Collaboration Meeting, Mizunami, 21/01/2009.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d3f5503460f94a18f26/html5/thumbnails/1.jpg)
Non-oscillation physics
Report of the WG
M. Sioli, OPERA Collaboration Meeting, Mizunami, 21/01/2009
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Activities in the WG
Atmospheric muon charge ratio See later
Atmospheric upgoing neutrino induced muons See later
Coincidences between LNGS experiments See later
Measurement of neutrino velocity with the CNGS beam No news w.r.t. Sorrento (remember WFD problem in the CERN DB)
Neutral heavy lepton searches Still no candidates (persons!)
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Atmospheric muon spectrum and charge ratio(N. Mauri and M. S.)
Different selection levels:
Selection of good-quality extractions: based on distribution of
event rate AND nTT AND nRPC AND nHPT1 AND nHPT2 AND nHPT3 AND nHPT4 AND nHPT5 AND nHPT6
After this first selection: corresponding livetime: 88 days
Total number of events: 306605
Charge and momentum reconstructed events: 88326
Excellent cross check between MACRO and OPERA data:
Ratio REAL/MC = (97.3 ± 0.5)%
Selection of good-quality events:
cut on the number of clusters, on the fraction of used clusters for each track, on parallelism condition for bundles
Selection of good-quality tracks:
cut on the maximum number of HPT digits per station
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Momentum measurement
1 SM
2 SM
MC recREAL data
MC truth
GeV/c
GeV/clog10(P/GeV/c)
log10(P/GeV/c)
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Atmospheric muon charge-ratio
The update of cosmic ray muon analysis using data collected with standard and inverted magnet polarity let us investigate the charge ratio as a function of different variables. Studying the charge ratio as a function of the
azimuthal angle we found a huge source of systematic error on the charge-reconstructed data (already presented in Sorrento)
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Presented at Physics and Analysis Meeting in Sorrento:Charge ratio as a function of the azimuthal angle SM1 vs SM2 - HPT doublets
SM1 = 180o
SM2 = ~210o
azimuth angle (degrees)
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Reconstructed muon charge ratioMuon charge ratio as a function of the azimuth anglein the 4 magnet arms
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Conjecture assumed: ambiguity in HPT reconstruction
150 o
210o
Directions in which we found the major effects in the CR modulation
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Study of the conjecture We selected a set of events (~150) in the direction with the major effect on
CR (210 deg), and looked by eye at the HPT fit reconstruction: we found only 10% badly reconstructed events, we could remove using a cut on the sigma of the reconstructed angle.
Example of a typical event (good behavior of the HPT fit algorithm)
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Study of the conjecture
10% badly reconstructed events: an example
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Misalignment effectInterpretation of this effect is misalignment in xz-direction: we disentangled the x-contribution from the z-contribution. The x-shift of one HPT station w.r.t the other one corresponds to the x-residual in the nearly horizontal direction, while the S-shape is due to a z-shift.
We corrected the “relative” position of the second station w.r.t the first station in the doublet.
We corrected the x-shift, using the shift around the horizontal direction, and then the z-shift, minimizing the slope of the residual distribution w.r.t the reconstructed angle (we expect a flat distribution around 0).
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Further studiesWe investigated other sources for this effect running OpRec with DTubeReconstruction only on singletts, i.e. forcing the reconstruction only in each HPT station.
We studied the x-residuals, the x difference between two stations in each doublett at an average z.
x = xHPT1 – xHPT2
angleHPT2
(cm)
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Misalignment correctionResiduals projected on the distance between the 2 HPT fit
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Corrections applied after the doublet alignment
X correction (cm) Z correction (cm)
Plane2_SM1 0.06 0.46
Plane4_SM1 0.01 0.50
Plane6_SM1 0.10 0.45
Plane2_SM2 0.04 0.45
Plane4_SM2 0.13 0.31
Plane6_SM2 0.05 0.23
Corrections (in cm) we applied to the x and z shifts in the alignment files in OpUtils/v*/data/DriftTube/Alignment
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After corrections
Residuals projected on the distance between the 2 HPT fit
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Effect on the reconstructed muon charge ratioMuon charge ratio as a function of the azimuth angle with the standard alignment files
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Effect on the reconstructed muon charge ratioMuon charge ratio as a function of the azimuth angle with the corrected alignment files
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Other possible effects to be investigated 1) Most probably we have to implement other iterations
to converge 2) There could be bending effects on the X direction that
could produce such a shape
x
z
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Overall charge ratio (SM1+SM2)
Muon charge ratio as a function of the azimuth angle with the corrected alignment files.
CR = 1.246 ± 0.014
Cuts:
(1 < < 50) mrad
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Further corrections: same process for extractions with magnet off
In this case the residuals are calculated between HPT doubletts (DTubeReco on both HPT stations).
1st arm
4th arm3rd arm
2nd arm
It seems (of course) better than the singlett case, but…
At a more narrow scale, we could think to correct for at least x shift (recognizable around horizontal direction, i.e. 0 deg)
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Delta-angle with magnet off
for extractions with magnet off, after the corrections on the Alignment files
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Variation of CR w.r.t cut
CR (fit)CR (fit corrected with
misid)
(0 < < 50) mrad 1.233 ± 0.013 1.294
(1 < < 50) mrad 1.246 ± 0.014 1.302
(2 < < 50) mrad 1.255 ± 0.016 1.302
(5 < < 50) mrad 1.28 ± 0.02 1.31
Charge ratio prediction: 1.31 Charge ratio prediction: 1.31 ± 0.02± 0.02statstat ± 0.01± 0.01comp-modelcomp-model
Absolute normalization: OPERA/FLUKA = (0.96 ± 0.03)Absolute normalization: OPERA/FLUKA = (0.96 ± 0.03)FLUKAPREDICTIONS
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Atmospheric upgoing neutrino induced muons(Timothee B, Jacques M.) Reprocessing of all the data with the new CosmicPattern version and into a 64 bit
architecture. Important also to test the new version of the reconstruction code, which is going to be published on CVS.
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Coincidences between LNGS experiments
This new topic is going to be started Involved people:
Dario A. and M. S. for OPERA M. Selvi (INFN-Bologna) for LVD Other interested people are warmly welcomed
(Olga R. has been contacted) Work already done:
M. Selvi prepared a file in which he selected July events with timestamp and event number, ready to be cross-referenced with a similar file from the OPERA side
MC simulation: FLUKA simulation has been extended in order to include hall A, B and C (from a CAD file) and the OPERA, LVD and ICARUS volumes, to be used by the corresponding Collaborations to feed their detector simulation package.
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Conclusions
In the NOP WG, some analysis are in a good state, most of the problems have been solved (upgoing muon analysis) or are on the way to be solved ( charge ratio)
A new study is going to be started (OPERA-LVD coincidences)
The paper on the charge ratio measurement has been stopped up to the complete solving of the alignment problem: what we need is the “state of the art” of HPT data analysis (correct timing cuts, last alignment files...)
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Spares
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MC charge mis-assign as a function of azimuthal angle
HPT Singlets HPT Doublets
azimuth angle (degrees)azimuth angle (degrees)