george tzanakos, university of athens, greeceerice05, sept 23, 2005 1 george tzanakos university of...
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George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 1
George TzanakosUniversity of Athens
Outline
Introduction
Physics Goals
The NuMI Beam
Detector Technology
The MINERvA Detector
Expected Results
Connection to Neutrino Oscillation Expts
Current Status and Outlook
Conclusions
MINERA
NuMI
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 2
Main INjector ExpeRiment for v -A• MINERvA is a newly approved FNAL Experiment
designed to study neutrino-nucleus interactions with unprecedented detail.
• MINERvA uses a compact, fully active neutrino detector to make accurate measurements of v – A cross sections in exclussive channels.
• The MINERvA detector will be placed in the NuMI beam line upstream of the MINOS Near Detector.
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 3
NuMI Beam
MINOS ND
MINERvA
Main Injector
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 5
Red = HEP, Blue = NP, Black = Theorist
D. Drakoulakos, P. Stamoulis, G. Tzanakos, M. ZoisUniversity of Athens, Athens, Greece
D. Casper, J. Dunmore, C. Regis, B. ZiemerUniversity of California, Irvine, California
E. PaschosUniversity of Dortmund, Dortmund, Germany
D. Boehnlein, D. A. Harris, M. Kostin, J.G. Morfin, A. Pla-Dalmau, P. Rubinov, P. Shanahan, P. Spentzouris
Fermi National Accelerator Laboratory, Batavia, Illinois
M.E. Christy, W. Hinton, C.E .KeppelHampton University, Hampton, Virginia
R. Burnstein, O. Kamaev, N. SolomeyIllinois Institute of Technology, Chicago, Illinois
S.KulaginInstitute for Nuclear Research, Moscow, Russia
I. Niculescu. G. .NiculescuJames Madison University, Harrisonburg, Virginia
G. Blazey, M.A.C. Cummings, V. RykalinNorthern Illinois University, DeKalb, Illinois
W.K. Brooks, A. Bruell, R. Ent, D. Gaskell,,W. Melnitchouk, S. Wood
Jefferson Lab, Newport News, Virginia
S. Boyd, D. Naples, V. PaoloneUniversity of Pittsburgh, Pittsburgh, Pennsylvania
A. Bodek, R. Bradford, H. Budd, J. Chvojka,P. de Babaro, S. Manly, K. McFarland, J. Park, W. Sakumoto
University of Rochester, Rochester, New York
R. Gilman, C. Glasshausser, X. Jiang, G. Kumbartzki,K. McCormick, R. Ransome
Rutgers University, New Brunswick, New Jersey
A. ChakravortySaint Xavier University, Chicago, Illinois
H. Gallagher, T. Kafka, W.A. Mann, W. OliverTufts University, Medford, Massachusetts
J. Nelson, F.X.YumicevaWilliam and Mary College, Williamsburg, Virginia
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 6
For mass splitting (m2) measurements in νμ disappearance• Understanding of relationship between observed energy & incident
neutrino energy (Evis E) ultimate precision in m2
– Measurement of -initiated nuclear effects – Improved measurement of exclusive cross sections
For electron appearance (νμ νe)• Much improved measurements of - A exclusive accurate background
predictions signal above background estimation– Individual final states cross sections (esp. π0 production)– Intra-nuclear charge exchange– Nuclear (A) dependence
For Nuclear Physics• New precise Jefferson Lab measurements of electron scattering are
inspiring nuclear physicists to consider neutrinos– Vector versus axial vector form factors– Nuclear effects: are they the same or different for neutrinos?
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 7
• Axial form factor of the nucleon
– Yet to be accurately measured over a wide Q2 range.
• Resonance production in both NC & CC neutrino interactions
– Statistically significant measurements with 1-5 GeV neutrinos *
– Study of “duality” with neutrinos
• Coherent pion production
– Statistically significant measurements of or A-dependence
• Nuclear effects
– Expect some significant differences for -A vs e/μ-A nuclear effects
• Strange Particle Production
– Important backgrounds for proton decay
• Parton distribution functions
– Measurement of high-x behavior of quarks
• Generalized parton distributions
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 8
Mainly from experiments in the 70’s and 80’s at ANL, BNL, FNAL, CERN, Serpukov
• World sample statistics is poor! • Systematics large due to flux uncertainties• See examples:
• Quasi elastic scattering• Single pion production (CC)• Total Cross Section• Coherent pion production
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 9
S. Zeller - NuInt04
K2K and MiniBooNe
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 11
E
(tot/E) vs E
NuMI flux (1-20 GeV)
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 12
• Need an Intense Neutrino Beam (NuMI Beam)
• Improved Systematics in Neutrino Flux (NuMI Target in MIPP Experiment)
• We need a detector with
– Good tracking resolution
– Good momentum resolution
– A low momentum threshold
– Timing (for strange particle ID)
– Particle ID to identify exclusive final states
– Variety of targets to study nuclear dependencies
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 14
• 120 GeV primary Main Injector beam• 675 meter decay pipe for p decay• Target readily movable in beam direction• 2-horn beam adjusts for variable energy range
Move Target only Move Target and Horn #2
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Examples of Real MINOS ND Events in two spills:
• Extremely intense beam: means near detectors see huge event rates.
• Example: NuMI low energy beam, get ~million events per ton-year in near hall
• MIPP measurements of NuMI target mean that flux will be better predicted than ever before
• Perfect opportunity for precision interaction studies.
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 16
Assume: • 16×1020 POT in 4 years (mixture of LE, ME, & HE tunes)
• Fiducial Volumes 3 ton (CH), 0.6 ton C, 1 ton Fe & 1 ton Pb • 16 M total CC events (8.8 M in CH, 7.2 M in C,Fe, Pb)
Expected event yields:– Quasi-elastic 0.8 M events
– Resonance Production 1.6 M
– Transition: Resonance to DIS 2.0 M
– DIS and Structure Functions 4.1 M
– Coherent Pion Production 85 K (CC) & 37 K (NC)
– Strange & Charm Particle Production >230 K fully reco’d
– Generalized Parton Distributions ~10 K
– Nuclear Effects C: 1.4M; Fe: 2.9M; Pb: 2.9M
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 17
DDK Connectors
Scintillator and embedded WLS
Clear fiber
CookieM-64 PMT
PMT Box
• 1.7 x 3.3 cm triangular Sci strips
• 1.2 mm WLS Fiber readout
Form Planes
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PMT Box Assembly
Fiber Bundle
Fiber Cookie
64 signalsHamamatsu M64 MAPMT
M64 MAPMT• 64 pixels, 8 X 8 array• pixel: 2 x 2 mm2
• QE (520 nm): >12.5%• Cross-talk: ~ 10%• Anode Pulse Rise Time: ~0.83 nsec• TTS: 0.3 nsec• Uniformity: 1:3
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• Downstream (DS) Calorimeters: – ECAL: Pb X0/3 between each sampling plane
– HCAL: 1 inch steel (0/6) between each sampling plane.
• Outer Detector (OD): (HCAL) frames
• Active Target: Segmented scintillator detector 5.87 tons
• 1 ton of US nuclear target (C, Fe, Pb) planes (absorber + Scintillator)
• Side ECAL: Pb X0/3 sampling
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 20
Steel Frame
Scintillator planes or calorimeter targets
Scintillator for calorimeters
Mounting ears
Lead Collar
ECAL
3.80 m
Side view
OD
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• Proton and muon tracks are clearly resolved• Observed energy deposit is shown as size of hit; can clearly see larger proton dE/dx• Precise determination of vertex and measurement of Q2 from tracking
• Quasi-elastic n–pp
–
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 22
nuclear targets
active detector
ECAL
HCAL
0 Production
• two photons clearly resolved (tracked). • can find vertex.• some photons shower in ID, some inside ECAL (Pb absorber) region• photon energy resolution is ~6%/sqrt(E) (average)
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 23
• QE Scattering Cross Sections
• Axial Form Factors
• Nuclear Effects
• Coherent Pion Production
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 27
Efficiencies and Purity included.
Minera (4 year run}
FA from previous D2 experiments
Dipole Form:
• Vector form factors measured with electrons.• GE/GM ratio varies with Q2 - a surprise from JLab• Axial form factor poorly known
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 28
FA from the D2 experiments.
Deviation from Dipole behavior. Plot FA/Dipole form vs Q2
Cross Section/Dipole
Polarization/Dipole
MINERvA can determine:
• Whether FA deviates from a dipole
• Which Q2 form is correct: “cross-section” or “polarization”
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 29
• Neutral pion production is a significant background for neutrino oscillations– Asymmetric π0 showers can be
confused with an electron shower
±
0
±
N N
P
Z/W
• Tests understanding of the weak interaction
–The cross section can be calculated in various models
Precision measurement of (E) for NC and CC channels
Measurement of A-dependence
Comparison with theoretical models
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 30
Expected MiniBooNe & K2K measurements
4-year MINERVA run
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 31
MINERvA’s nuclear targets allowthe first measurement of theA-dependence of σcoh
across a wide A range
A
MINERvA errors
Rein-Seghal model
Paschos- Kartavtsev model
A-range of current measurements
Plotted: σcoh vs. A
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 32
Nuclear Effects & Δm2 Measurements
Evis ≠ E
– Understand the relationship
Evis E
– π absorption & rescattering
– Final state rest masses
– v-nuclear corrections predicted to be different from those in charged lepton scattering (studied from Deuterium to Pb at high energies)
n
π
μ
Sergey Kulagin model
F2, Pb/C (MINERA stat. errors)
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 33
Fe: Effect of pion absorption
• Nuclear targets: C, Fe, Pb
•No Pion Absorption
•Effect of pion rescattering
Plotted: Evis/E versus E
C
PbFe
-3
+3
Nominal abs
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 34
Before MINERvA (AM)
Post MINERvA (PM)
(δΔ/Δ) versus Δ (Δ Δm2)
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 35
Total fractional error in the predictions as a
function of reach (NOvA)
Process QE RES COH DIS
NOW (CC,NC) (%) 20 40 100 20
after MINERA (CC,NC) (%) 5/na 5/10 5/20 5/10
• NOvA’s near detector will see different mix of events than the far
detector
Before
After
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 36
• To make an accurate prediction one needs
– 1 - 4 GeV neutrino cross sections (with energy dependence )
• MINERvA can provide these with low energy NuMI configuration
T2K’s ND will see different mix of events than the FD
George Tzanakos, University of Athens, Greece ERICE05, Sept 23, 2005 37
• April 2004 – Stage I approval from FNAL PAC
• October 2004 – Complete first Vertical Slice Test with MINERνA extrusions, WLS fiber and Front-End electronics
• January 2005 – First Project Director’s (‘Temple’) Review
• Summer 2005 – Second Vertical Slice Test
• December 2005 – Projected Date for MINERvA Project Baseline Review
• October 2006 – Start of Construction
• Summer 2008 – MINERvA Installation and Commissioning in NuMI Near Hall
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• Presently Low Energy - Nucleus interactions are poorly measured. MINERA, a recently approved experiment, brings together the expertise of the HEP and NP communities to use the NuMI beam and a high granularity detector to break new ground on precision low-energy -A interaction measurements.
• MINERvA will provide a high statistics and improved systematics study of important exclusive channels across a wider E range than currently available. With excellent knowledge of the beam (NuMI + MIPP), exclusive cross sections will be measured with unprecedented precision.
• MINERvA will make a systematic study of nuclear effects in -A interactions (different than well-studied e-A channels) using C, Fe and Pb targets.
• MINERvA will help improve the systematic errors of current and future neutrino oscillation experiments (MINOS, NOvA, T2K, and others).