N eutrino E xperiment with S pectrometer S i n E urope SPECTROMETER(S) Prospects for a New Neutrino...

Neutrino Experiment with SpectrometerS in

Europe

SPECTROMETER(S) Prospects for a New

Neutrino CERN-PS Experiment:

1Luca Stanco - CdS Padova

F.Mills, July 2010

As a summary of tensions on Neutrino Oscillation business:


Neutrino Oscillation:

problem solved?• Neutrino oscillations have established a picture and a large

number of experiments consistent with the mixing of three physical neutrino e, and with mass eigenstates 1,2 and 3.

• There are however a number of anomalies which, if confirmed, could be due to the presence of an additional, large squared mass difference and of additional neutrinos.

• Two distinct classes of anomalies have been observed, namely – apparent disappearance signals: (1) the anti-e events detected from

near-by nuclear reactors and (2) from the from Mega-Curie k-capture calibration sources in the Gallium experiments to detect solar e

– observation for excess signals of ne electrons from neutrinos from particle accelerators (LNSD/MiniBooNE)

– and… MINOS (CPT?)


Anomalies in mesures at reactors

G. Mention et al. arXiv:1101.2755v1 [hep-ex] Experimental results are compared to the prediction without oscillation, taking into account the new spectra, the neutron mean lifetime and the off-equilibrium effects. The averaged ratio is 0.937 ±0.027


Excess of events: 87.9 22.4 6.0

Beam relatedbackgrounds

Expectation foroscillations

Data points afterbackground subtraction

LSND: Evidence for (

e)


F.Mills, ICHEP,

July 2010

Putting together LNSD and MiniBooNE

Plus reactors’ “anomaly”, Gallium “anomaly”, cosmology indications…


A complicated picture ? Sterile neutrino models 3+2 next minimal extension to 3+1

models 2 independent m2

4 mixing parameters 1 Dirac CP phase allowing difference

between neutrinos and antineutrinos

CMB + LSS + ΛCDMNs= 1.6 ± 0.9Hamann, Hannestad, Raffelt, Tamborra,Wong, PRL 105 (2010) 181301

Number of sterile neutrinos

FROM COSMOLOGY


Why a New Neutrino Facility ?

• The idea for reviving the CERN PS neutrino beam line was triggered by a letter of intent from an experimental collaboration led by C. Rubbia*

• Since then a more concrete experimental proposal is being considered

• However, it can also be used for other experiments/studies:– Neutrino cross section measurements at very low

energies (on and/or off-axis)– Target R&D– Detector studies, etc......

Beyond 3 Family Neutrino Oscillations, 4 May 2011 Rende Steerenberg, CERN Switzerland

RE

VIV

AL

OF

TH

E C

ER

N P

S N

EU

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INO

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* Memorandum to SPSC, March 9th 2011

9

Aim:Investigating the existence of sterile neutrinos through the measurement of νμ → νe oscillations by using a low energy νμ or νμ beam in combination with a close and far liquid argon time projection chamber.

What about νμ → ν oscillations ??Consider for example a 3+2 Sterile Neutrino model by Kopp et al.

APPEARANCE DISAPPEARANCE DISAPPEARANCE

€

⇒ e

€

e ⇒ ν e

€

⇒

TO BE FOLDED with the , e , , e BEAM compositions/contaminations and with and cross-sections ! 10Luca Stanco - CdS Padova

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

at PS site


C. Rubbia et al A search for anomalous neutrino disappearance and oscillatory phenomena at the CERN-PS” •Memorandum to SPSC, March 9th 2011

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


SpectrometerThe Target coveragemust be as large as possible

FAR site

* Liquid Argon is the best option as for - backgrounds - energy range - full measure of interaction


GOALS/CAVEATS

Perform a DESIGN STUDY for a two-module Detector as

- cheap - almost no R&D - fast - fully compatible with the LAr proposal(s) - standalone - maximizing the physics output


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

Dipole with B=1.5 Tesla

UNDER STUDY !!!


Possible Physics output:

Reconstructed Neutrino Energy

FAR site

-bar LAr+Spect (Q)

LAr+Spect (Q)


Actions so far and in the near future

MAY: presentations done to Neutrino Conferences ⇒ the physics case well accepted preliminary discussion with INFN mangement ⇒ INFN Giunta OK but no money for the beam discussions with CERN mangement ⇒ READY to pursue the beam project and to pay for the beam

JUNE: preliminary discussions with CNII ⇒ go ahead with the study and the setting up of Collaboration

SEPTEMBER: evaluation in CNII submission of a Memorandum to CERN-SPSC

NEXT: optimize the magnets and the detectors


A very exciting physics experiment is proposed for the more than 50 years old CERN PS CERN Research Board meeting of 8 June: Team set up.

TT7 and nTOF beam sharing makes efficient use of the CERN PS: The proposed experiment could be completed in 3 to 4 runs without forming

any competition for protons with other experiments Shortening possible by dedicated running nTOF would gain also on the number of integrated protons

No direct competition for protons between PS and SPS neutrino facilities

Large part of the required infrastructure is available, but needs to be consolidated

Everything else needs to be designed and constructed The facility can also be (re-)used for other low energy neutrino

physics, target R&D, Detector R&D, etc...

CERN position


Collaboration

Bari: 0.4 FTE/2Bologna: 1.1/4 Frascati: 0.2/2Lecce: 0.5/2 TOTAL: 4.7 FTE / 22 peoplePadova: 1.6/7Roma1: 0.6/3Salerno: 0.3/2

In case the DESIGN STUDY will become an EXPERIMENTBe ready to multiple people for about 2 and FTE for about 4

In the near future: expression of interest from - 2 other Italian sites- French groups- Cinese group


Coinvolgimenti:

BARI: Simulazione, Front-End

BOLOGNA: Simulazione, Software, DAQ, Disegno, Meccanica

FRASCATI: Simulazioni, Disegno, Rivelatori

LECCE: Rivelatori, Meccanica, Front-End, DAQ

PADOVA: Simulazione, Disegno, DAQ, Meccanica

ROMA-1: Simulazione e Software

SALERNO: Software e Calcolo


Gruppo di Padova:Gruppo di Padova:R.Bertolin (30%). Responsabile LocaleF.Dal Corso (10%) S. Dusini (40%) C.Fanin (10%)M. Laveder (10%)M.Mezzetto (20%)L.Stanco (40%). Responsabile Nazionale

1.6 F

TE

Riferimenti nella collaborazione

- Alessandro Bertolin: DAQ- Stefano Dusini: Simulazione Detector e DAQ- Marco Laveder: Studio Fisica- Mauro Mezzetto: Studio Fisica e Simulazione- Luca Stanco: Supervisione Costi e Collaborazione

Nel 2012 si dovrà ottimizzare la struttura. È mandatory costituire un team multi-site di Ingegneri Meccanici.A Padova si chiedono 6 mesi-uomo di Ingegnere e 6 mesi-uomo di disegnatore


Richieste finanziarie 2012

Missioni Interne: 27 K€ (6 a PD)

Missioni Estero: 24 K€ (6 a PD)

Inventario: 5 K€ (3 a PD)

Consumo: 33 K€ (8 a PD)

Richieste ai servizi PADOVA per il 2012:Richieste ai servizi PADOVA per il 2012:

Elettronica: 2 m.u. per consulenza DAQ

2 m.u. per consulenza Front-End

Meccanica: 4 mesi uomo prototipizzazione

Uffico Tecnico: 6+6 mesi per Struttura meccanica

Tot 89 K€, di cui 23 a Padova

(Richieste molto limitate per il prossimo anno)


Tentative FINANCIAL and TEMPORAL plan for 2013-2017

plus possible (minor) non-INFN contributions


20132014201520162017

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N eutrino E xperiment with S pectrometer S i n E urope SPECTROMETER(S) Prospects for a New Neutrino...

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