4/7/2008 DIS 2008 - Minerva 1

The MINERA Experiment

Heidi Schellman for the MINERA collaboration

4/7/2008 DIS 2008 - Minerva 2

The MINERA Experiment Red = HEP, Blue = NP, Black = Theorist

D. Drakoulakos, P. Stamoulis, G. Tzanakos, M. ZoisUniversity of Athens, Athens, Greece

C. Castromonte, H. da Motta, M. Vaz, J.L.PalominoCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, Brazil

D. Casper, J. Dunmore, C. Regis, B. ZiemerUniversity of California, Irvine, California

E. PaschosUniversity of Dortmund, Dortmund, Germany

M. Andrews, D. Boehnlein, N. Grossman, D. A. Harris, J. Kilmer, J.G. Morfin, A. Pla-Dalmau, P. Rubinov, P. Shanahan

Fermi National Accelerator Laboratory, Batavia, Illinois

J. Felix, G. Moreno, M.Reyes, G ZavalaUniversidad de Guanajuato, Guanajuato, Mexico

I.Albayrak, M..E. Christy, C.E .Keppel, V. TvaskisHampton University, Hampton, Virginia

A, Butkevich, S.KulaginInstitute for Nuclear Research, Moscow, Russia

I. Niculescu. G. .NiculescuJames Madison University, Harrisonburg, Virginia

W.K. Brooks, A. Bruell, R. Ent, D. Gaskell, W. Melnitchouk, S. WoodJefferson Lab, Newport News, Virginia

E. MaherMassachusetts College of Liberal Arts, North Adams, Massachusetts

R. GranUniversity of Minnesota-Duluth, Duluth Minnesota

D. Buchholtz, B. Gobbi, H. SchellmanNorthwestern University, Evanston, IL

S. Boyd, S. Dytman, M.-S. K, D. Naples, V. PaoloneUniversity of Pittsburgh, Pittsburgh, Pennsylvania

L. Aliaga, J.L. Bazo, A. Gago, Pontificia Universidad Catolica del Peru, Lima, Peru

A. Bodek, R. Bradford, H. Budd, J. Chvojka,,P. de Babaro, S. Manly, K. McFarland, J. Park, W. Sakumoto, J. Seger, J. Steinman

University of Rochester, Rochester, New York

R. Gilman, C. Glasshausser, X. Jiang, G. Kumbartzki,R. Ransome, E. Schulte

Rutgers University, New Brunswick, New Jersey

S. KoppUniversity og Texcas-Austin, Texas

D. Cherdack, H. Gallagher, T. Kafka, W.A. Mann, W. OliverTufts University, Medford, Massachusetts

R. Ochoa, O. Pereyra, J. SolanoUniversidad Nacional de Ingenieria. Lima, Peru

M. Kordosky, J. Nelson William and Mary College, Williamsburg, Virginia

4/7/2008 DIS 2008 - Minerva 3

The NuMI Beam Configurations.

For MINOS, the majority of the running will be in the “low-energy” (LE) configuration.

Post-MINOS: NOA would use the ME beam, MINERA would prefer LE (≥ one year) and ME

beam

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LE-configuration: Epeak = 3.0 GeV rate = 60 K events/ton/1020

pot ME-configuration: Epeak = 7.0 GeV,

rate = 230 K events/ton/1020 pot

HE-configuration: Epeak =12.0 GeV,

rate = 525 K events/ton/1020 pot

Expected Event statistics for a generic experiment.

With E-907 at Fermilab to measure particlespectra from the NuMI target, expect to know neutrino flux to ≈ ± 5%.

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“MINERvA” in the NUMI beamline

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Basic MINERvA Detector

Active core is segmented solid scintillator Tracking (including low momentum recoil

protons) Particle identification 3 ns (RMS) per hit timing

(track direction, stopped K±) Core surrounded by electromagnetic

and hadronic calorimeters Photon (0) & hadron energy

measurement Nuclear targets located in front of main

detector MINOS Near Detector as muon catcher

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Complete MINERA Experimental Set-up

LHe0.25 t

VetoWall

Cryotarget

FullyActive Target:8.3 tons

NuclearTargets:6.2 tons(40% scint.)

DS HCAL:30 tons

DS ECAL:15 tons

Side HCAL: 116 tons

Side ECAL Pb: 0.6 tons

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Event Sample with 4x1020 Protons on Target LE & 12x1020 POT ME beam

TargetTarget Fiducial Vol. Fiducial Vol. Expected CCExpected CC (tons)(tons) Yields Yields

Scint. 3 9.0MHe 0.2 0.6MC 0.15 0.4MFe 0.7 2.0MPb 0.85 2.5M

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MINERvA Physics Goals

Axial form factor of the nucleon Accurately measured over a wide Q2 range.

Resonance production in both NC & CC neutrino interactions Study of “duality” with neutrinos

Coherent pion production Strange particle production Parton distribution functions (DIS) at high x Generalized parton distributions Nuclear dependence of all of these

Expect some significant differences for -A vs e/-A nuclear effects

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MINERvA Detector Module

Inner Detector (ID) Hexagonal X, U, V planes for 3D tracking, Active Scintillator Target

Outer Detector (OD)“Towers” of iron & scintillator for hadron calorimetry

Lead for EM calorimetry

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MINERvA compared to NuTeV

Moore’s law for electronics 800 channels 32,000 for less $

5 cm

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Simulated events and particles

Quasielastic event

n p

0

Resonance production

p + - p 0

+

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Neutral Pions

Photons cleanly identified and tracked

π0 energy res.: 6%/√E (GeV)

For coherent pion production, the angular distribution is dominated by physics not resolution

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Particle Identification

p

X2 differences between right and best wrong hypothesis Particle ID by dE/dx in strips and Particle ID by dE/dx in strips and

endpoint activityendpoint activity

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MINERA Physics: Low Energy Neutrino Scattering

We will be making precisionmeasurements of lowenergy neutrino crosssections:

Contributions to total cross section: TOT = QE+RES+DIS

QE: Quasi-elastic

RES: Resonance

DIS: Deep Inelastic Scattering

Inelastic, Low-multiplicity final states

Inelastic, High-multiplicity final states

Lipari, Lusignoli and Sartogo, PRL 74, 4384 (1995)

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MINERA measurements

Main CC Physics Topics (Statistics in active target only - CH)

Quasi-elastic 0.8 M events

Resonance Production 1.7 M total Transition: Resonance to DIS 2.1 M events DIS, Structure Funcs. and high-x PDFs 4.3 M DIS

events Coherent Pion Production 89 K CC /

44 K NC Strange and Charm Particle Production > 240 K

fully reconstructed events Generalized Parton Distributions ~ 10 K

eventsAll absolute cross sectionresults will be limited by the flux normalization (~5%)

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Precision

Quasi Elastic

MINERvA Quasielastic

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A-dependence in scattering

A dependence observed in e/ DIS

Could be different for neutrinos Presence of axial-vector

current. Different nuclear effects

for valence and sea leads to different

shadowing for xF3 compared to F2.

0.7

0.8

0.9

1

1.1

1.2

0.001 0.01 0.1 1

EMCNMCE139E665

shadowing EMC effect

Fermi motion

x sea quark valence quark

If we understand at 10-20 GeVWill that help at 100 GeV?Comparing with JLAB will help.

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Low energy inclusive and exclusive cross sections for neutrino oscillations

0 NC important for oscillation experiments

e

OR

?

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MINERvA schedule

MINERvA received DOE critical decision (CD) 3a approval Spring 07 Authorization for advanced purchases Beginning purchases for PMT’s, WLS fiber, Clear fiber, PMT

box components, steel and lead Approved for full construction authorization (CD 3b) Fall 07

Included in FY08 Presidential Budget for Department of Energy

Construction is beginning Detector installation and commissioning in 2009

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MINERvA Test Beam Detector

40 planes, XUXV orientation as in full MINERvA Removable lead and iron absorbers. In light-proof box Size will be smaller: ~1.2 x 1.2 m2

Requesting Fermilab Test Beam Facility Upgrade to reach lower /K/p momenta of order 250 MeV

Test Beam run in the M-Test beam to be scheduled for late summer this year

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We’ll bring results to DIS 2010