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T2K S.Mine (University of California, Irvine) for T2K collaboration. Super-K: 50 kton water Cherenkov. J-PARC ~0.7 MW 40GeV PS. K. T. phase-2: Hyper-K. ~1GeV n m beam (~  100 of K2K). phase-2: ~4 MW. this talk. discovery of n m → n e appearance

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T2k s mine university of california irvine for t2k collaboration
T2KS.Mine (University of California, Irvine)for T2K collaboration

Super-K: 50 kton

water Cherenkov

J-PARC

~0.7MW 40GeV PS

K

T

phase-2:

Hyper-K

~1GeV nm beam

(~100 of K2K)

phase-2:

~4 MW

S.Mine(UCI)@PANIC(Santa Fe)


T2k s mine university of california irvine for t2k collaboration

this talk

  • discovery of nm→ne appearance

  • precise measurement of nm disappearance

  • discovery of CP violation (phase-2)

  • Physics goals:

  • Schedule:

  • J-PARC (~0.7MW 40GeV PS)

    • construction: 2001~2007

    • operation:2008~

  • T2K (approved in 2003)

    • construction:2004~2008

    • experiment: 2009 ~

S.Mine(UCI)@PANIC(Santa Fe)


T2k collaboration
T2K collaboration

12 countries

~60 institutions

~180 collaborators

S.Mine(UCI)@PANIC(Santa Fe)


Accelerator beam line status
Accelerator/Beam line status

n beam decay pipe

graphite target prototype

superconducting magnet

horn prototype

J-PARC

n beam line

S.Mine(UCI)@PANIC(Santa Fe)


Super kamiokande history
Super-Kamiokande history

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

SK-III

SK-I

SK-II

reconstruction

accident

plastic vessel

SK-II

SK-I

11,146 number of inner detector PMTs 5,182

40 % photocathode coverage 19 %

S.Mine(UCI)@PANIC(Santa Fe)


Narrow intense beam off axis beam

Super-K.

q

Decay Pipe

Target

Horns

Narrow intense beam: Off-axis beam

First Application

(ref.: BNL-E889 Proposal)

(schematic)

osc. prob.@

Dm2=3x10-3eV2

p decay Kinematics

OA0°

nm flux

OA2°

0o

OA2.5°

En (GeV)

2o

OA3°

2.5o

3o

pp (GeV/c)

S.Mine(UCI)@PANIC(Santa Fe)


N interaction @ sk w o oscillation
n interaction @ SK(w/o oscillation)

  • 2.5o off-axis beam (40GeV)

  • NEUT

  • n int.(22.5kt/1021pot)

    ~ 2200(nm)

  • ne/nm at peak ~0.4%

nm

ne

n int. @ SK (/50MeV/22.5kt/1021pot)

1021pot~1year

neutrino energy (GeV)

S.Mine(UCI)@PANIC(Santa Fe)


3 flavor oscillation simplified
3 flavor oscillation (simplified)

  • nm disappearance

  • ne appearance

  • beam nene oscillation

P(nm→ne) = sin2q23 sin22q13 sin2(1.27 Dm132L/E)

in this analysis

unless noted

Dm122=0, Dm122<<Dm132=Dm232

Dm232=2.5x10-3eV2,q23=p/4

no matter effect

CP phase d=0

S.Mine(UCI)@PANIC(Santa Fe)


Selection criteria for n e appearance
Selection criteria for ne appearance

(SK-I detector simulator & reconstruction used)

  • Standard SK cuts:

  • Further p0 cuts:

(w/o Enrec cut)

  • fully contained(FC)

  • in fiducial volume(FV),

  • visible energy>100MeV

  • single-ring

  • PID(e/m)

  • no decay-e

  • 0.35<Enrec<0.85GeV

signal+BG

total BG

ne BG

events/22.5kt/5x1021pot

sin22q13=0.1

reconstructed energy (GeV)

  • cosqne<0.9

  • Mgg & DL cuts of POLfit

S.Mine(UCI)@PANIC(Santa Fe)


Polfit p 0 fitter
POLfit (p0 fitter)

force to find 2ndg-ring

identify and reject

asymmetric decay

p0 BG in 1R-e sample

POLfit

standard

fitter

g2

g1

  • input:

  • vertex,1st ring dir.,total Evis

  • output:

  • Mgg, DL(p0like-elike)

500MeV/c p0 MC

true Pg2 = 55.5MeV/c

rec.Mp0 =140.4MeV/c2

S.Mine(UCI)@PANIC(Santa Fe)


Events vs selections
Events vs. selections

(events / 22.5kt / 5x1021pot)

(sin22q13=0.1)

S.Mine(UCI)@PANIC(Santa Fe)


N e sensitivity
ne sensitivity

Dm2(eV2)

90%CL

DBG=10%

5x1021pot

CHOOZ

excluded

sin22q13~0.008

@2.5x10-3eV2

sin22q13

S.Mine(UCI)@PANIC(Santa Fe)


N e sensitivity as a function of cp phase d
ne sensitivity as a function of CP-phase d

(90%CL, 5x1021pot, DBG=10%)

S.Mine(UCI)@PANIC(Santa Fe)


N e sensitivity vs exposure dependence on background uncertainty
ne sensitivity vs. exposure(dependence on background uncertainty)

DBG sources:

DBG=20%

DBG=10%

DBG=5%

sin22q13

  • SK itself

    • p0 rejection efficiency

    • e/m separation

    • decay-e

    • fiducial volume

    • energy scale

    • etc.

  • p0 production

  • beam ne

3s

90%CL

NDs

exposure (22.5kt •1021pot)

S.Mine(UCI)@PANIC(Santa Fe)


K2k n e search @ sk
K2K ne search @ SK

(Feldman-Cousins approach)

K2K1+K2K2 DATA:

FCFV112 ev

Single Ring 67

PID(e/m) 9

tight e –ID 8

Evis>100 MeV 7

No e from me 5

POLfit cut(e/p0) 1

limit

sensitivity

expected BG: 1.63

observed: 1

CHOOZ

limit(90%)

  • exp’d BG:1.63

  • nm int. 1.25

  • beam ne 0.38

me

sin22qme <0.18

@2.8x10-3eV2

S.Mine(UCI)@PANIC(Santa Fe)


E m separation @ sk
e/m separation @ SK

S.Mine(UCI)@PANIC(Santa Fe)


E m separation @ sk1
e/m separation @ SK

atm-nDATA(1R)

atm-n MC(1R)

sub-GeV

(Evis<1330MeV)

multi-GeV

(Evis>1330MeV)

An experiment with test beams also confirmed

PID capability: PL B374(1996)238

S.Mine(UCI)@PANIC(Santa Fe)


E p 0 separation @ sk
e/p0 separation @ SK

nm MC (1Re)

(rejected as p0 like)

70% p0 rejection and

30% signal efficiency loss

for 1R-e sample for K2K

(selected)

atm-n DATA(1R-e)

atm-n MC(1R-e)

(Evis=150-250MeV)

Mgg(MeV/c2)

signal ne (Dm2=2.8e-3)

p0 induced event

POLfit

(selected)

POLfit

momentum of the 1st ring (MeV/c)

S.Mine(UCI)@PANIC(Santa Fe)


Nc p 0 measurement @ k2k 1kt

DATA

MC

NC p0 measurement @ K2K-1KT

events

background

for ne search

non-p0 BG

s(NC1p0)/s(CCall)=0.064±0.001±0.007 (0.065 by NEUT): Phys.Lett.B619:255,2004

S.Mine(UCI)@PANIC(Santa Fe)


Sciboone k2k sci bar detector at fnal boo ster ne utrino beam line

MiniBooNE beamline

SciBar

Decay region

MiniBooNE Detector

50 m

100 m

SciBooNE (K2K-SciBar detector at FNAL Booster Neutrino Beam line)

  • Cross section measurements for T2K

    • for both neutrinos and anti-neutrinos

  • MiniBooNE near detector

    It will be proposed to FNAL soon

    (cheap/quick experiment)

T2K

SciBar

at BooNE

Flux (normalized by area)

K2K

1 2

S.Mine(UCI)@PANIC(Santa Fe)

En (GeV)


T2k near detectors

ND280:

Conceptual

Design

Report

T2K neardetectors

The Experimental facility

at 2km is not approved yet

FGD

ECAL

TPC

UA1

Magnet

Muon

Ranger

Water

Cherenkov

Lq. Ar TPC

Pi-zero

Detector

Tracker

S.Mine(UCI)@PANIC(Santa Fe)


N e sensitivity vs calendar time possibility of beam power upgrade

n commissioning

n phys run

2009

2010

2011

2012

2013

Japanese Fiscal Year (Apr-Mar)

ne sensitivity vs. calendar time(possibility of beam power upgrade)

10% syst. err assumed

on BG subtraction

0.05

400MeV LINAC from FY2011

1yr = 130days

0.04

0.03

current baseline power

sin22q13 sensitivity (90%CL)

0.02

0.01

0

S.Mine(UCI)@PANIC(Santa Fe)


Summary
Summary

  • T2K is approved and the construction is on schedule

  • Neutrino experiment will start in 2009

  • q13 sensitivity (phase-1):

    - the latest n MC & SK1 final tools

    - SK is ideal for separating m/e/p0, K2K has demonstrated background rejection in ne search

    - ~10times improvement from CHOOZ

    - background should be understood < ~10%:

  • Seriously considering to increase beam power

reconstruction @ SK

p0 production and beam ne @ NDs

S.Mine(UCI)@PANIC(Santa Fe)


Supplement

supplement

S.Mine(UCI)@PANIC(Santa Fe)



Phase 2 if q 13 can be measured
Phase 2 ( if q13 can be measured. )

2nd Phase (201x~?)

Hyper-Kamiokande(~1Mt)

48m × 50m ×500m,

Total mass = 1 Mton

nucleon decay search

CP violation measurement

S.Mine(UCI)@PANIC(Santa Fe)


Search for cp violation

4MW, 540kt

2yr for nm

6.8yr for nm

Search for CP violation

CHOOZ excluded

sin22q13<0.12@Dm312~3x10-3eV2

stat+5%syst.

stat+2%syst.

(signal+BG) stat only

stat+10%syst.

no BG

signal stat only

T2K 3s discovery

3s CP sensitivity : |d|>20o for sin22q13>0.01 with 2% syst.

S.Mine(UCI)@PANIC(Santa Fe)


Signal candidate
Signal candidate:

RUN: 21858

EVENT: 2240771

Eg1: 266.7MeV

Eg2: 170.8MeV

qgg: 22.5 deg.

Mgg: 83.1MeV/c2

Looks multi-ring event.

S.Mine(UCI)@PANIC(Santa Fe)


Possibility of beam power upgrade

n commissioning

n line

const.

n phys run

Possibility of beam power upgrade

3

400MeV LINAC from FY2011

2

Beam Power (kW)

1

0

2008

2009

2010

2011

2012

Japanese Fiscal Year (Apr-Mar)

S.Mine(UCI)@PANIC(Santa Fe)


T2k s mine university of california irvine for t2k collaboration

  • nm disappearance

  • ne appearance

  • beam ne

d→-d, a→-a for anti.-n

S.Mine(UCI)@PANIC(Santa Fe)


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