MINERvA Overview - PowerPoint Presentation

Slide1

MINERvA Overview

MINERvA is studying neutrino interactions in unprecedented detail on a variety of different nucleiLow Energy (LE) Beam Goals: Study both signal and background reactions relevant to oscillation experiments (current and future)Measure nuclear effects on exclusive final statesas function of a measured neutrino energyStudy differences between neutrinos and anti-neutrinos Precise understanding important for oscillation expt’sMedium Energy (ME) Beam (NOvA) Goals: Structure Functions on various nucleiStudy high energy feed-down backgrounds to LBNE NuMI Beamline ProvidesHigh intensity, Wide range of available energiesMINERvA detector Provides Reconstruction in different nuclei, broad range of final states

Low Energy and

Special RunFluxes

~100

Particle

,

Nuclear

,

and Theoretical physicists from 22 InstitutionsSlide2

MINERvA Detector Basics

Nuclear Targets Allows side by side comparisons between different nucleiSolid C, Fe, Pb, He, waterSolid scintillator tracker Tracking, particle ID, calorimetric energy measurementsLow visible energy thresholdsSide and downstream Electromagnetic and Hadronic CalorimetryAllow for event energy containmentMINOS Near DetectorProvides muon charge and momentum

ECAL

HCAL

n

Nuclear Targets

cryogenic targetSlide3

MINERvA Data

One out of three views shown, color=energySingle Electron candidate

Quasi-elastic candidate

Deep Inelastic Scatter candidate

Resonant

candidateSlide4

MINER

nA: Quasi-Elastic Analysis4Relatively Simple Final stateRequire Muon, plus little or no extra energyPrimary interaction type for neutrino oscillation experimentsMeasuring muon energy and angle (with respect to the beam) reconstructs a quasi-elastic interaction:neutrino energy

momentum transfer to nucleon (Q2)Preliminary analysis of first half of anti-neutrino data taken during final detector construction period, represents about 1/10 of current data set.Statistical errors only

Anti-neutrino,

0.4

×1020 POT, partial detector(~10% of data)

Anti-neutrino, 0.4×1020 POT, partial detector

(~10% of data)First shown at NuINT’11, Dehradun IndiaSlide5

MINER

nA: Special Runs to understand Neutrino Flux5Goal: to test flux model by taking neutrino data in several different configurationsMap through pion production spectrumChange transverse and longitudinal focusingStandard candle cross sections should be independent of incident neutrino fluxCapability unique to NuMI beamlineStandard candles available: Inclusive Charged Current eventsQuasi-Elastic EventsHave taken 4 special run configurationsMedium, High energy target positions

Horn off data (no focusing)Developing Data Reconstruction and Flux Tuning Infrastructure in parallel

Reconstructed neutrino energy of charged current candidates in standard running and three neutrino mode special runs

Reconstructed neutrino energy of charged current candidates in special run in antineutrino mode and 0 horn currentSlide6

MINER

nA: Nuclear Target Analysis6MINERvA has 5 solid nuclear targetsDifferent thicknesses good for different analyses: most downstream target best for exclusive final state analysesFirst look at inclusive Charged Current (CC) events from Fe and Pb

Target

Fiducial Massnm CC Events in 4×1020 POTPlastic6.43 tons

1363kHelium

0.25 tons56kCarbon

0.17 tons36k

Water0.39 tons

81kIron

0.97 tons215k

Lead0.98 tons228kNeutrino Mode 1.3×1020 POTTarget 5 only (1/15 of expected sample)First shown at NuINT’11, Dehradun India