1. The T2K Experiment: Status & IC Involvement
Matthew Malek
Imperial College London
Joint IPPP-IC Workshop
28-May-2009

2. Evidence for n oscillations from…
SuperK
71±5
Early Solar Neutrino Exps.
SNO
Soudan II
K2K
KamLAND
MACRO
MINOS
 Neutrinos have mass and mix!

3. Three neutrino mixing 3

4. Current goals of n oscillation physics
The fundamental goal is to understand the origin of the masses and mixings.
To do that we must:
Determine how close to maximal the “atmospheric” mixing is.
Determine q13 (or, if Nature is unkind, improve limits).
Measure the sign of Dm223 – observe matter effects.
Observe (or limit) CP violation in oscillations.
Which will also require:
Hadron production measurements like NA61.
Much better understanding of neutrino interactions.
T2K

5. The T2K Collaboration ~400 members, 65 Institutes, 12 countries Canada
TRIUMF
U. Alberta
U. B. Columbia
U. Regina
U. Toronto
U. Victoria
York U.
France
CEA Saclay
IPN Lyon
LLR E. Poly.
LPNHE Paris
Germany
U. Aachen
Italy
INFN, U. Roma
INFN, U. Napoli
INFN, U. Padova
INFN, U. Bari
Japan
U. Hiroshima
ICRR
ICRR Kamioka
ICRR RCCN
KEK
Kyoto U.
U. Kobe
U. Miyagi
U. Osaka City
U. Tokyo
Poland
A. Soltan, Warsaw
IFJ PAN, Krakow
T. U. Warsaw
U. Silesia, Katowice
U. Warsaw
U. Wroklaw
Russia
INR
S. Korea
N. U. Chonnam
U. Dongshin
N. U. Gyeongsang
N. U. Kyungpook
U. Sejong
N. U. Seoul
U. Sungkyunkwan
Spain
IFIC, Valencia
U. A. Barcelona
Switzerland
U. Bern
U. Geneva
ETH Zurich
United Kingdom
Imperial C. London
Queen Mary U. L.
Lancaster U.
Liverpool U.
Oxford U.
Sheffield U.
Warwick U.
STFC/RAL
STFC/Daresbury
USA
Boston U.
B.N.L.
Colorado S. U.
Duke U.
Louisiana S. U.
Stony Brook U.
U. C. Irvine
U. Colorado
U. Pittsburgh
U. Rochester
U. Washington 5

6. What are we trying to measure?
nm disappearance
Dm2= 2.0 x10-3 eV2
Dm2= 2.5 x10-3 eV2
No oscillation
Must understand
Non-CCQE Background!
sin22q23
Dm232
Precision measurements

7. What are we trying to measure?
ne appearance
Must understand
Both Backgrounds!
sin22q13

8. #

9. The Near (Off-Axis) Detector
UA1 Magnet 0.2T field
Includes a water target in P0D and Tracker
Understand interactions at SK
Tracker Region
Fine Grained Detectors
& TPCs
Particle Tracking
P0D
Measure NC p0 rate
ECAL
Surrounds tracker and P0D
Capture EM energy
SMRD
Muon ranging instrumentation in the magnet yoke 9

10. Far Detector: Super-Kamiokande
50 kton H2O Cherenkov Detector
SK-I: Apr 1996 – Jul 2001
SK-II: Dec 2002 – Oct 2005
(only half PMTs installed)
SK-III: Jul 2006 – Sep 2008
(fully recovered from accident)
SK-IV: Sep Now
(new electronics)
42 m
39 m 10

11. The 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
Sep 2008 – Mar 2009: Construction and installation of the INGRID Detector
Sep 2008: FGD, TPC beam tests at TRIUMF
Mar 2009: DsECAL cosmic ray tests at RAL
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! 11

12. UK Involvement in T2K Beamline Components
Beam dump design
Beam Window
Baffle
Target design and second target manufacture
Target Remote Handling
280m Off-Axis Basket and Mechanical Integration
Electromagnetic Calorimeter
Front-end and back-end electronics for:
ECAL, P0D, INGRID, SMRD
DAQ software
Offline software
Analysis

13. Imperial College Involvement in T2K: Senior Members
Dave Wark
International Co-Spokesperson
Yoshi Uchida
Leader of Physics & Software in UK
Convener of ND280 software group
Morgan Wascko
Sci-BooNE spokesperson
T2K analysis
Costas Andreopoulos (at RAL)
Lead author of GENIE
ECAL hardware

14. Imperial College Involvement in T2K: Post-Docs
Antonin Vacheret
Designed ECAL (with Yoshi)
MPPC development
DAQ
Matthew Malek
Analysis:
Super-Kamiokande expert
Blinding studies
Oscillation studies
Liaison with global T2K SK group

15. Imperial College Involvement in T2K: Post-Graduate Students
Joe Walding
Sci-BooNE analysis
Pawel Guzowski
Online / offline expert
ND280 p0 analysis
Jim Dobson
Cross section studies
ND280 analysis
Sarah Dipper
SK analysis (appearance)
Gil Kogan
SK analysis (disappearance)
Patrick Masliah
Global oscillation studies

16. Conclusions Construction of T2K is on target!
J-PARC facility on schedule
Super-Kamiokande upgrade complete
Construction of ND280 detectors on schedule
T2K will address open questions in the neutrino sector
How small is q13?
Can we search for CP violation?
How close is q23 to maximal?
Presenting first results in 2010
Imperial group well positioned to make significant contributions 16