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An Experimental EXERCISE on European Sterility
An Experimental EXERCISE on European Sterility
Luca Stanco – INFN Padova
Beyond Three Neutrino Family Oscillations
on behalf of a motivated group of Italian Staff Physicists
LNGS Workshop 3-4 May 2011
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A.Bertolin (5), R. Brugnera (5,6), S. Dusini (5), R.A. Fini (1), A. Garfagnini (5,6), M. Laveder (5,6), A.Longhin (4), M. Mezzetto(5), M.T. Muciaccia (1), A. Paoloni (4), L. Patrizii (2), S. Simone (1), M. Sioli (2,3), G. Sirri (2), M. Spurio (2,3), L. Stanco* (5)
(1) Bari University and INFN(2) INFN Bologna(3) Bologna University(4) INFN-LNF(5) INFN Padova(6)Padova University
* contact
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SPECTROMETER(S) Prospects for a CERN-PS Experiment
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1. Physics
2. Place
3. Setup
1. Analysis
2. Achievements
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What OscillationS between Which ?
E313 PHYSICS
E.G. take the 3+2 model by Kopp et al. (see also Schwetz-Mezzetto talks)
APPEARANCE DISAPPEARANCE DISAPPEARANCE
€
νμ ⇒ νe
€
νe ⇒ ν e
€
νμ ⇒ νμ
TO BE FOLDED with the νμ , νe , νμ , νe BEAM compositions/contaminations
and with ν and ν cross-sections !
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3.75*1020 p.o.t = 3 years of anti-ν
E313 PHYSICS-I
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€
FluxPS (ν μ ) × Cross − Section
€
Ratio :
Flux (ν μ ) × σ ν
Flux (ν μ ) × σ ν
3 !
€
ν μ
€
νμ
€
ν /ν
inte
nsi
ties
€
Pdisappearance (ν μ → ν μ )from previous model
2.5*1020 p.o.t = 2 years of ν
1 RUN = MANY DATA !
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E313 PHYSICS-II
The large number of models (i.e. the lack of conclusive DATA)implies the ABSOLUTE need for a DOUBLE measure: FAR and NEAR
to establish what is oscillating and what is not
TWO SPECTROMETERS
FARNEAR
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at PS site
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E313 PHYSICS-III
Charge and momentum measurements in Neutrino Interactionsfor the Charge Current mode: important and challenging
Important because:
• increase the active target mass by measuring the muon momentum• increase the range of m2 (at higher values, especially in the eV2 range)• calibration of the beam with a clean muon measurement at high p• normalization point for the NC/CC rates
• clean separation of nu and anti-nu interactions• disentangle the nu and anti-nu reverse contaminations in the beams
Challenging because:
• find best compromise between passive and active materials
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E313 PLACEFor semplicity take the T600 LAr proposal *(Memorandum to SPSC09/03/2011)
SpectrometerThe Target coveragemust be as large as possible
FAR site
* Liquid Argon is the best option as for - backgrounds - energy range - full measure of ν interaction
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E313 PLACE-II NEAR site
Spectrometer
Same Spectrometer, only half shorterin the transverse coordinate
Same Proposal: Liquid Argon is the best optionas for - systematics control - backgrounds - full measure of ν interaction
(Scintillator back-up solution ??)
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E313 SET-UP(which Spectrometers ?)
Neutrinos
MUONS from CCA.U
.
MUONS in LAr interactions (standard GENIE simulation)
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Negative Focussing rather different !
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E313 SETUP-II
MUONS coming out downstream of LAr
ANGULAR distribution
MOMENTUM distribution
1 rad
4 GeV
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z-vertex
FAR site
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E313 SETUP-III
In conclusion:
• “light” spectrometer, e.g. 2.5 cm iron slabs• several detection layers, e.g. 8 layers per arm• as wide as possible, e.g. 2*8 m (w) * 5 m (h)
Use RPC detectors ALAOP and Precision Trackers
8 m 8 m
5 m
2 m (2 arms)
FAR = 2 * NEAR
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Dipole with B=1.5 Tesla
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E313 Analysis
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4 3+4+5 collected3+4 p from range4+5 p and q from bending
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Several topologies to be taken into account (CC mode):
Parametrized simulation and reconstruction of LAr target.Full simulation of Spectrometers’ responses
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E313 Analysis-II NEAR site
μ fully contained
Collected by Spectrometer
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E313 Analysis-III FAR site
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Collected by Spectrometer
μ fully contained
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E313 Achievements-I
- The Charge Identification is better than 98.5% up to ~ 5 GeV momentum- p/p has to be optimized depending on B*dl, no. of planes of measurements and the Iron slab thickness- The containment is dominated by transverse dimensions (!)
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E.G. Momentum Resolution of largest sample
(full crossing)
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E313 Achievements-II
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3.75x1020 pot
νμ-bar interactions
Reconstructed Neutrino Energy
NEAR site
Reconstructed in LAr
LAr + Spectrometer
νμ-bar LAr+Spect (Q)
νμ LAr+Spect (Q)
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E313 Achievements-IIbisNEAR site
νμ-bar LAr+Spect (Q)
νμ LAr+Spect (Q)
Reconstructed Neutrino Energy
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E313 Achievements-III
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3.75x1020 pot
Reconstructed Neutrino Energy
FAR site
νμ-bar interactions
Reconstructed in LAr
LAr + Spectrometer
νμ-bar LAr+Spect (Q)
νμ LAr+Spect (Q)
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E313 Achievements-IIIbis
Reconstructed Neutrino Energy
FAR site
νμ-bar LAr+Spect (Q)
νμ LAr+Spect (Q)
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There is great INTEREST in the PHYSICS of the Sterile Neutrinos
(“There is a great confusion under the sky,Then the situation could indeed be excellent”)
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Well prompted PHYSICISTS made an Exercise
The PS-CERN option seems to match manyQUESTIONS on the subject of Sterile Neutrinos
The use of Spectrometers (FAR and NEAR)can be a very important handle (if not mandatory)
Conclusions
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Backup Slides
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Neutrino energy reconstruction• Muon momentum reconstruction:
– If contained in LAr range– If not contained in LAr and not crossing the spectro
and distance(LAr)>2m MCS– If stop in Arm1 range– If stop in Arm2 range (and charge from bending in Arm1)– If cross Arm1 & Arm2 Bending (charge and momentum)
+ MCS in LAr
• Neutrino energy reconstruction:– If QE: two-body kinematics– If not-QE: gaussian smearing on the
hadronic component E/E = 0.3/sqrt(E)
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E313 Analysis-II NEAR site
μ fully contained
Collected by Spectrometer
Vertex Interaction in Fiducial Volume 100%
“ & μ-track in LAr > 20 cm 89%
“ & “ & escape from LAr 55% μ Partiall ycontained
“ & “ & Spectrometer(with distance in LAr < 2 m)
34%(17%)
collected by Spectr.
“ & “ & stop in arm1 9% stopping in 1rst arm
“ & “ & stop in arm2 7% stopping in 2nd arm
“ & “ & passing through 18% passing through
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E313 Analysis-III FAR siteVertex Interaction in Fiducial Volume 100%
“ & μ-track in LAr > 20 cm 92%
“ & “ & escape from LAr 51% μ partially contained
“ & “ & Spectrometer(with distance in LAr < 2 m)
20%(9%)
collected by Spectr.
“ & “ & stop in arm1 4% stopping in 1rst arm
“ & “ & stop in arm2 5% stopping in 2nd arm
“ & “ & passing through 11% Passing through
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Collected by Spectrometer
μ fully contained