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Long-Baseline Neutrino Oscillation Experiment ROBERT J. WILSON FOR THE T2K COLLABORATION 15 DECEMBER 2010 NNN2010 – TOYAMA, JAPAN Tokai Super-Kamiokande

Long-Baseline Neutrino Oscillation Experiment

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Long-Baseline Neutrino Oscillation Experiment. Robert J. Wilson for the T2K Collaboration 15 December 2010 NNN2010 – Toyama, Japan. . . . . . . . . Tokai. Super-Kamiokande. T2K Goals. Measure last unknown mixing angle θ 13 using ν μ ➞ ν e appearance - PowerPoint PPT Presentation

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Long-Baseline Neutrino Oscillation ExperimentRobert J. Wilsonfor the T2K Collaboration15 December 2010NNN2010 Toyama, Japan

TokaiSuper-Kamiokande

OverviewPhysics Objectives Oscillation Parameters SensitivityT2K Beam Near Detectors & Far Detector (Super-K)Status & Schedule3R.J.Wilson/Colorado State UniversityT2K Goals4R.J.Wilson/Colorado State UniversityMeasure last unknown mixing angle 13 using e appearance

Precise measurement of the atmospheric parameters 23 and Dm322 using disappearance5R.J.Wilson/Colorado State UniversityApproximation to 3-flavor vacuum mixing with Dm212 2 m from wall)Evis > 100 MeVno of rings =1e-like ringNo decay electronInv. mass w/ forced-found 2nd ring < 105 MeVEnrec < 1250 MeVEvis > 30 MeVno of rings =1m-like ringnm disappearance analysisne appearance searchSK event selection decided before the runPossible because SK is a mature & well understood detector 27

T2K Events in Super-K28

pm = 1061 MeV/c1 decay-electronpm = 1438 MeV/c2 decay-electronsJan-June 2010# of eventsFully-Contained (FC)33 + fiducial volume cut+ visible E > 30 MeV (FCFV)232828

T0 = SK trig time -T2K beam trigger timeSuper-K Time DistributionGPS works well - very good time synchronization between T2K beam and Super-K Change 6->8 bunches since Nov. evident

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Jan-JuneNov.-Dec.

Low energy : NC g excitationOuter DetectorFully-contained2010/2011 Run30R.J.Wilson/Colorado State UniversityStarted Nov. 18th ~50% increase in data in 3 weeksCurrent beam power ~115 kW

Aim for 150 kW 107s by July 201110x 1st run datasensitivity to sin22q13 0.05

Design Goal: 3.75 MW 107sJuly 2011 goal Summary1st run JanuaryJune 2010Continuous beam at ~50 kW, accumulated 3.23 x 1019 PoTGood overall stability of beam and detector performanceMeasured 23 neutrino beam events (FCFV) at Super-KExpect first results by winter 2011 conferencesSummer/fall shutdownNew kicker magnet & power supplies installedINGRID modules assembly and installationCalorimeter modules installation completed - full coverage at ND2802nd run November 2010 Summer 2011Aim for 150 kW x 107 s by July 2011; currently > 110 kW90% c.l. sensitivity sin22q13 ~ 0.05

31R.J.Wilson/Colorado State UniversitySupplementary32R.J.Wilson/Colorado State UniversitySimilar to normal hierarchyT2K insensitive to matter effects

T2K 13 sensitivity (inverted hierarchy)MINOS Nu201033R.J.Wilson/Colorado State University34CERN NA-61/SHINENeutrino beam depends upon secondary beam geometry and hadron distribution off targetNA-61/SHINE : dedicated hadron production experiment using T2K target to reduce uncertainties in hadron production modelsPilot run in 2007 and high statistics run in 2009 : p(30 GeV) with Carbon thin target and T2K replica targetpreliminary results from 2007 used in T2K beam MC

MC=GFLUKAPreliminaryT2K sensitivity and discovery potential

35R.J.Wilson/Colorado State University3s measurementBeam Power Plan

Japanese Fiscal Year(starts April 1 of CY)36R.J.Wilson/Colorado State University