Bari OsmanovUniversity of Florida

MINERvA: neutrino cross-sections for the future

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 1 o f20

on behalf of MINERvA collaboration

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 2 of 20

Outline

Neutrino beam

Neutrino detection

Physics goals

Data analysis

Tracking Prototype

Conclusion

Why? Precise knowledge of neutrino cross-sections is important in the determination of neutrino beam spectrum and the prediction of the expected spectrum of neutrino events in the far detector in the absence of neutrino oscillations.

What? MINERvA is a neutrino scattering experiment aimed to provide high-precision cross-sections for present and future neutrino oscillation experiments. It will also study nucleon structure and nuclear effects in neutrino interactions.

Where? Fermi National Accelerator Laboratory, high-intensity NuMI neutrino beam

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 3 of 20

Main aspects

Neutrino beam

low-energy: - E

peak=3.0 GeV, <E>=10.2 GeV

- 60K events per ton per 1020 POT

medium-energy: - E

peak=7.0 GeV, <E>=8.0 GeV

- 230K events per ton per 1020 POT

high-energy: - E

peak=12.0 GeV, <E>=14.0 GeV

- 525K events per ton per 1020 POT

expect to know the flux to

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 4 of 20

A hybrid of fully-active fine-grained tracking detector and traditional calorimeter

Good resolution in measuring momentum, energy and angle of the outgoing particles

Located 100 m underground in the NuMI beamline upstream of MINOS Near Detector

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 5 of 20

Neutrino detection I

Each module consists of inner (ID) and outer (OD) detector regions.4 types of modules:

Type I: tracker (total of 84 modules): ID – 2 fully active scintillator planes (sequence of XU/XV for

3D tracking) with lead frame along the border for electron calorimetry;

OD – 6 outer steel towers with scintillator bars for hadroncalorimetry;

Type II: ECAL (total of 10 modules):ID – 2 fully active scintillator planes (XU/XV) and 1 lead plane;OD – 6 outer steel towers with scintillator bars for hadroncalorimetry;

Type III: HCAL (total of 20 modules): ID – 1 fully active scintillator plane and 1 steel plane;OD – 6 outer steel towers with scintillator bars for hadroncalorimetry;

Type IV: nuclear targets (total of 5 modules):ID – mixed plane from C, Fe, Pb;OD – 6 outer steel towers with scintillator bars for hadroncalorimetry;

Neutrino detection II

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 6 of 20

ID

OD OD

OD

OD

OD

OD

veto wall

Neutrino detection III

CROC/VME readoutDAQ computer Permanent Storage

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 7 of 20

Extruded scintillator with WLS fiber(appr.30,000 channels)2.5 mm position resolution

M-64 PMTs FEBssignal amplification and digitization

LI system(dead channels, PMT gain measurement)

Nuclear targets

Carbon (0.14 tons), iron (0.69 tons), lead (0.86 tons) - mixed elements in layers to give similar systematics

Will be inserted between the main detector layers (4 tracker modules between the targets)

4He cryogenic target in front of the detector

1st study of neutrino nuclear effects

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 8 of 20

Physics goals

Neutrino interaction cross sections

Form factors and structure functions

Nuclear effects

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Cross-section measurements QE

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Quasi-elastic interaction (we expect over 800K QE events for 16E20 POT)

Total error reduction:

1) QE XS – from 20% down to 5-10%2) RES - from 40% to 7%(CC)/12%(NC)3) DIS - from 20% to 5%(CC)/10%(NC)

Very important in oscillation experiments for signal/background separation

Before MINERvA

After MINERvA

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 11 of 20

Form-factors and structure functions

QE axial FF:

to measure high-Q2 behavior

improved measurements at low Q2

Structure functions:

MinervA can isolate all structure functions

PDFs can then be determined

addition to studies with EM probes

F2

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 12 of 20

Nuclear effects

nucleon Fermi motion effects and modification of nucleon properties (form-factors) in nuclear medium

FS interactions of the produced hadrons in the nucleus

measured quantities: observed interaction rate, hadron spectrum and multiplicity

For 16E20 POT:

- 2M events on Fe and Pb

- 1M on C

- 500K on He

- 9M events in scintillator

Data analysis

Reconstruction points: takes energy and time of the hit in the scintillator plane as the input parameters time-slicing – separate events within the spill pre-clustering – group strips in a plane and calculate X, U, and V coordinate 1-D tracking – chaining clusters in the same view 3-D tracking – associate 1-D projections track fitting – fit 3-D track (Kalman filter, least squares) vertex finding – match the tracks calorimetric reconstruction (uses energy deposition) track fitting with MINOS particle ID

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 13 of 20

Tracking Prototype (TP) (20% of full detector)

Prototype version (24 modules) of the final detector (114 modules) to test the concepts (registration, readout, analysis)

Prototype nuclear target (Fe) installed 10'' from the first TP module

Cosmic rays, calibration and beam runs

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 14 of 20

Tracking Prototype sees first events !!!

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 15 of 20

Quasi – elastic candidate

energy of this proton: 200-250 MeV

p

tracker ECAL HCAL

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 16 of 20

Tracking Prototype sees first events !!!

candidate

tracker ECAL HCAL

DIS candidate

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 17 of 20

Tracking Prototype sees first events !!!

tracker ECAL HCAL

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 18 of 20

Candidate event from Fe target

Tracking Prototype sees first events !!!

p

tracker ECAL HCAL

Conclusion

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 19 of 20

MINERvA will play an important and potentially decisive role in helping current and future precision oscillation experiments reach their ultimate sensitivity

Nuclear targets will be used to study nuclear effects in neutrino interactions for the first time

Prototype version of the final detector was constructed and operated in NuMI hall

Currently building the remaining modules (plan to complete by mid-February 2010)

Full detector installed mid-March 2010

- University of Athens, Athens, Greece- Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro, Brazil- University of California, Irvine, California- University of Dortmund, Dortmund, Germany- Fermi National Accelerator Laboratory, Batavia, Illinois- University of Florida, Gainesville, Florida- Universidad de Guanajuato, Division de Ciencias e Ingenierias, Leon Guanajuato, Mexico- Hampton University, Hampton, Virginia- Institute for Nuclear Research, Moscow, Russia- James Madison University, Harrisonburg, Virginia- Jefferson Lab, Newport News, Virginia- Massachusetts College of Liberal Arts, North Adams, Massachusetts- University of Minnesota-Duluth, Duluth, Minnesota- Northwestern University, Evanston, Illinois- Otterbein College, Westerville, Ohio- Pontificia Universidad Catolica del Peru, Lima, Peru- University of Pittsburgh, Pittsburgh, Pennsylvania- Purdue University-Calumet, Hammond, Indiana- University of Rochester, Rochester, New York- Rutgers University, New Brunswick, New Jersey- University of Texas, Austin, Texas- Tufts University, Medford, Massachusetts- Universidad Nacional de Ingenieria, Lima, Peru- The College of William and Mary, Williamsburg, Virginia

MINERvA collaboration

EPS HEP 2009 16-22 July, Krakow, Poland Bari Osmanov, University of Florida 20 of 20

http://minerva.fnal.gov/

Thank you!