Status Of The T2K Experimenttau08.inp.nsk.su/talks/25/Terri.pdf · • Sep 2008:2008: FGDFGD,...

Status Of The T2K ExperimentStatus Of The T2K Experiment

Ryan Terri (for the T2K Collaboration)

TAU08 ConferenceTAU08 Conference

BINP Novosibirsk, Russia

1R. Terri T2K Status TAU08

The T2K Collaboration

CanadaTRIUMF

407 members, 65 Institutes, 12 countriesItalyINFN, U. Roma

PolandA. Soltan, Warsaw

Sheffield U.Warwick U.

N. U. SeoulU. SungkyunkwanTRIUMF

U. AlbertaU. B. ColumbiaU. ReginaU Toronto

INFN, U. RomaINFN, U. NapoliINFN, U. PadovaINFN, U. Bari

. So ta , Wa sawIFJ PAN, KrakowT. U. WarsawU. Silesia, KatowiceU Warsaw

STFC/RALSTFC/Daresbury

USA

U. Su g yu wa

SpainIFIC, ValenciaU A BarcelonaU. Toronto

U. VictoriaYork U.

F

JapanU. HiroshimaICRRICRR K i k

U. WarsawU. Wroklaw

RussiaINR

Boston U.B.N.L.Colorado S. U.Duke U

U. A. Barcelona

SwitzerlandU. BernU GFrance

CEA SaclayIPN LyonLLR E. Poly.

ICRR KamiokaICRR RCCNKEKKyoto U.

INR

S. KoreaN. U. Chonnam

Duke U.Louisiana S. U.Stony Brook U.U. C. IrvineU Colorado

U. GenevaETH Zurich

United KingdomLPNHE Paris

GermanyU. Aachen

U. KobeU. MiyagiU. Osaka CityU. Tokyo

U. DongshinN. U. GyeongsangN. U. KyungpookU. Sejong

U. ColoradoU. PittsburghU. RochesterU. Washington

Imperial C. LondonQueen Mary U. L.Lancaster U.Liverpool U.

2

Oxford U.

R. Terri T2K Status TAU08

The T2K ExperimentThe T2K Experiment• Long baseline neutrino

experiment Super‐Kamiokande

• Measure/set limits on neutrino oscillation parameters– νμ→ντ

• νμ disappearance– νμ→νe

• ν appearanceνe appearance

• Precision measurement of atmospheric neutrino parameters: sin22θ23 and

Off‐axis Near Detectorp 23Δm23

2

– Is sin22θ23 maximal?• First measurement of θ13

BeamLine13

• Possibly look for CP‐violation3R. Terri T2K Status TAU08

Line

2 Flavor ν Oscillation Probabilities2 Flavor ν Oscillation Probabilities

• Atmospheric osc.Atmospheric osc. parameters measured using the νμ survival

( ) ⎟⎟⎠

⎞⎜⎜⎝

⎛ Δ−≈→ E

LmP

22

232 2327.1sin2sin1 θ

μμ νν

μprobability

• θ13 search involves νeappearance from νμoscillations

( ) ( ) ⎟⎟⎠

⎞⎜⎜⎝

⎛ Δ≈→ E

LmP

e

22

132

232 3127.1sin2sinsin θθννμoscillations

– CP violating terms in 3 flavor osc. probs.

⎟⎠

⎜⎝ Eμ

Δm2 m2 m2flavor osc. probs.

R. Terri T2K Status TAU08 4

Δm2ij = m2

i – m2j

Main Measurements: νμμdisappearance•Phase 1:

•5 years w/ a 0.75 MW beam

•5x1021 POT•Measurement of mixing angles, Δm23

2

•Use CC quasi elastic qevents as signal

•Can calculate parent neutrino energy

sin22θ23neutrino energy

•Background from non‐quasi elastic events

5

Eν (MeV)Δm232

R. Terri T2K Status TAU08μμμ

μμν θcos

221

pEmmEm

EN

Nrec

+−−

=

•Search for an excess of events overMain measurement: Search for an excess of events over expected background

•Background sources:•Intrinsic ν in beam

νe appearance

•Intrinsic νe in beam•Mis‐identified NC π0 events•Mis‐identified muons in far detector

0

5

10

15

20

25

30

35

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5Reconstructed Eν(GeV)

Expected Signal+BGsin22θ13=0.10sin22θ23=1.0Δm2=0.003eV2

Total BG

BG from νμ+antiνμ

0

5

10

15

20

25

30

35



Total BG


0

5

10

15

20

25

30

35



Total BG


0

5

10

15

20

25

30

35



Total BG


sin22θ13

0

5

10

15

20

25

30

35



Total BG



Facility at J‐Parc181 MeV Linac

Facility at J ParcJ‐PARC January 2008

The ND280 Pit Neutrino Beamline

7

3 GeV RCS50 GeV Proton Synchrotron

Stage 1: 0.75 MW R. Terri T2K Status TAU08

Neutrino Beam Line & Beam Spectrum

Horn operation at 320 kA Successfully tested

p

Off axis beam technique:Creates narrow band beam not

i d di l f dpointed directly at far detector

Graphite Target in Ti‐alloy capsuleSuccessfully installed 29‐Aug‐2008

Neutrino Flux at SKνμ, νμ, νe, νe

110 m Decay Volume

Beam predictions to be tested:•Near detectors : νs•NA 61: Hadrons


J‐PARC Milestones and TimelineJ PARC Milestones and Timeline• The Accelerator Group at J‐PARC is doing an excellent job getting beam line built in timej g g

• Linac: Fully Commissioned• 181 MeV (day 1 beam energy) achieved Jan 2007• Good beam stability

• 3GeV Synchrotron (RCS): Fully Commissioned• 3 GeV acceleration and extraction Oct 2007• 3 GeV acceleration and extraction Oct 2007• 4.4x1012 particles per bunch, 25 Hz @100 kW

• Main Ring Synchrotrong y• Beam captured and circulated from RCS in May 2008• Acceleration to 30 GeV after the summerE t ti t t i b li i A 2009• Extraction to neutrino beamline in Apr 2009


Far Detector: Super‐KamiokandeFar Detector: Super Kamiokande

50 kton H O Cherenkov Detector50 kton H2O Cherenkov DetectorSK‐I:March 1996 – July 2001SK‐II:

42 m

SK II:Dec. 2002 – Oct. 2005SK‐III: July 2006 – Sept. 2008y pRecovered from accident

SK‐IV: Sept. 2008 ‐39 m Upgrade of electronics and DAQ

for T2K and SK‐IV; testing currently underway


T2K Near Detector Off-axis detector

Suite• Understand the neutrino b b f ill tibeam before oscillations occur

• On – Axis DetectorO s etecto• Monitor beam direction

• Monitor beam intensity

Off A i D• Off – Axis Detector• Beam flux

• Beam νe contaminationO i D t t37me

• Cross sectionsOn-axis DetectorINGRID

37m


On Axis – The INGRID Detector

• Modular Detector– 16 Modules

• Each Module– 10 Scintillator Bar Layers, 9 Fe Layers– Surrounding Veto PlanesSu ou d g e o a es– Wavelength Shifting Fiber →

Hamamatsu MPPCs

• Construction and installationConstruction and installation begins this month

INGRID Module Construction


Multi‐Pixel Photon

Characterization•Dark noise ~ 0.5MHz•Cross‐talk/after‐pulsing

Counters: MPPCs

•Used in all scintillator detectors

/ p g•Recovery effects•~70 V operation voltage•Strong temperature and over‐voltage dependence•Used in all scintillator detectors

•Need ~50,000 •Array of silicon photodiodes operating just above avalanche

g p

operating just above avalanche breakdown voltage

•Similar to PMTs, but cheaper, smaller, and insensitive to magnetic fields

•Testing•Aging and Stability have been tested at high temperatures

•No problems so far Simulationl l f ll h


•Developing simulation for all characteristics•Incorporated into ND280 electronics simulation

The Off‐Axis DetectorThe Off Axis Detector• UA1 Magnet 0.2T field• Includes a water target in P0D

d T kand Tracker• Understand interactions at SK

• Tracker Region• Fine Grained Detectors (FGDs) &

TPCs• Particle Tracking

• P0D• P0D• Measure NC π0 rate

• ECAL • S rro nds tracker and P0D• Surrounds tracker and P0D• Capture EM energy

• SMRD• Muon ranging instrumentation in• Muon ranging instrumentation in

the magnet yoke14R. Terri T2K Status TAU08

ND280 Magnet and Basket

The Ma net Mo in S stem in the Pit

Installation of the coils

The Magnet Moving System in the Pit

Delivery of theThe Magnet at JPARC

Delivery of the basket for testing


Constructing the ND280: Tracking regionTPCs and FGDsM CCQE t ( & fl

TPC Construction

•Measure CCQE events (νe & νμ flux, E‐spectrum)•Measure ν cross‐sections and kinematicskinematics•Measure nuclear recoil•PID

Currently in test beam at TRIUMF

FGD Construction TPC Inner Wall16R. Terri T2K Status TAU08

P0D or π0 Detector

Constructing the ND280: P0D, ECal, SMRD SMRD Bars

P0D or π Detector•Measure νe‐appearance backgrounds, especially π

0

production rates, kinematics•Water‐in vs water‐out subtraction for cross‐sections•Water‐in vs. water‐out subtraction for cross‐sections

ECal•Surrounds P0D and trackers to capture EM energyπ0 reconstruction and PID•π0 reconstruction and PIDSMRD•Muon‐ranging instrumentation in magnet yoke

DS ECAL ConstructionP0D Layer Construction

P0D bars

DS‐ECAL Construction


Some Predicted Performances of the ffOff‐Axis DetectorTPC & FGD

ProtonsPions P0D NC π0 Reconstruction ε

Water No Water

TPCΔp/p ECAL Energy Resolution


Electrons Photons

ND280 event• As ND280 is being is also being

FGD1 FGD2DS‐ECal

As ND280 is being is also being virtually integrated• Software team is working on matching sub-detector information

t b d i

P0D

at boundaries• A “Physics Book” is being created for upcoming analyses

ν DIS eventνμ DIS event

Reconstructed tracks overlay the MC “truth” tracks

CCQE νμ event

MC truth tracks


The T2K TimelineThe T2K Timeline• 2000: Ideas for T2K first discussed• Jan 2007 – Dec 2008: JPARC accelerator commissioning• Apr‐Jun 2008 : Installation of the magnet in the Pit• Jun 2008: T2K funding fully approved in all contributing countriescountries

• Sep 2008 – Mar 2009: Construction and installation of the INGRID Detector

• Sep 2008: FGD TPC beam tests at TRIUMF• Sep 2008: FGD, TPC beam tests at TRIUMF• Apr 2009: First T2K neutrinos• May 2009: ECAL test beam at CERN• Summer, Fall 2009: Installation of ND280 off axis Detector• Winter 2009: Start of full T2K running• 2010: First T2K Results!2010: First T2K Results!


ConclusionsConclusions

• T2K is on target to start collecting neutrinos next Aprilg g p– J‐PARC facility on schedule– Super‐Kamiokande upgrade completeConstruction of ND280 detectors on schedule– Construction of ND280 detectors on schedule

• T2K will address open questions in the neutrino sector– How small is θ13?

• Can we search for CP violation?– How close is θ23 to maximal?23

• Presenting first results in 2010


Back UpsBack Ups


Other θ13 Experiment Sensitivities vs. T2K

• Double CHOOZ From slide 6:

– Sensitivity for θ13 is at sin22θ13<0.02 (@ 90% C.L.)

– hep‐ex 0704.0498hep ex 0704.0498

• Daya Bay– Sensitivity fo for θ13 is at

i 22θ 0 01 (@ 90%sin22θ13<~0.01 (@ 90% C.L.) for 3 years running

– hep‐ex 0701029

• Note: T2K is competitive with Daya Bay in θ13 sensitivitysensitivity


Possible Tau Appearance SearchPossible Tau Appearance Search

• Small flux of neutrinos with From slide 8:

Neutrino Flux at SKνμ, νμ, νe, νe

Eν>mτ• Tau appearance search

would probably need i il l ti t SKsimilar selection to SK analysis (PRL 97 171801 (2008)) for beam events:

Inside SK’s 22 5 kton fiducial– Inside SK s 22.5 kton fiducialvolume

– Visible E > 1.33 GeV– Most energetic ring electron‐g g

like• Initially, use counting

experiment


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Status Of The T2K Experimenttau08.inp.nsk.su/talks/25/Terri.pdf · • Sep 2008:2008: FGDFGD,...

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