Neutrino Scattering in the NuMI Beam To Perform a High-Statistics Neutrino Scattering Experiment using an On-Axis Fine- grained Detector in the NuMI Beam MINERA (Main INjector ExpeRiment v-A) MINERA Collaboration Meeting 27-28 June 2003 Argonne - Athens - California/Irvine - Colorado - Dortmund - Duke - Fermilab - Hampton - I I T - INR/Moscow -James Madison - Jefferson Lab - M I T - Minnesota - Pittsburgh - Rochester - Rutgers - South Carolina - Tufts 19 Groups: Red = HEP, Blue = NP, Green = Theorists only
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Neutrino Scattering in the NuMI Beam To Perform a High-Statistics Neutrino Scattering Experiment using an On-Axis Fine-grained Detector in the NuMI Beam.
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Neutrino Scattering in the NuMI Beam
To Perform a High-Statistics Neutrino ScatteringExperiment using an On-Axis Fine-grained Detector
WITH E-907 (MIPP) THIS UNCERTAINTY IN HADRON PRODUCTION SPECTRA WILL BE RESOLVED BY
MEASURING THE SPECTRA OF HADRONS COMING OFF THE NUMI TARGET
Neutrino Scattering in the NuMI Beam
Obtaining the Latest NuMI Beam Simulations
Neutrino Scattering in the NuMI Beam
Tot, Fi(x,Q2),Duality and Nuclear Effects
Experiment: (only) on nuclear targets: d/dxdQ off, mainly, carbon Could say F2 = xF3 at high x, but … Concentrate on careful measurement of
transition region Low energy (< 10 GeV) primarily from the
70’s and 80’s suffering from low statistics and large systematics (mainly from flux measurements).
Mainly bubble chamber results --> larger correction for missing neutrals.
D. Naples - NuInt02
Neutrino Scattering in the NuMI Beam
How well do we model Tot ?
S. Zeller - NuInt02
Neutrino Scattering in the NuMI Beam
D. Naples Conclusions from NuInt02
Neutrino Scattering in the NuMI Beam
Nuclear Effects
Without can’t measure flavor dependence of nuclear effects However, can make careful measurement of ratio of d/dxdQ
off C, Fe and Pb. Never measured before. Study shadowing and EMC effect with neutrinos!
Can measure dD(z)/dxdQ off C, Fe and Pb which would be a convolution of all nuclear effects including: boson (quark-flavor dependence) and transparency (final-state interactions / formation-length /color transparency)effects.
Behavior of F2 as x --> 1.0 in Nuclear Environment Few-nucleon-correlation and multi-quark models allow quarks to have
higher momentum ---> high x tail with F2 e- ax
CCFR: a = 8.3 ± 0.7 ± 0.7, e: a = 16 ± 0.5
Neutrino Scattering in the NuMI Beam
Nuclear Effects with Neutrinos
Ratio Fe/C: Statistical ErrorsFrom MINOS Parasitic Run
xBj MINOS MINOS all DIS
0.0 - .01 1.8 % xxx
.01 - .02 1.4 10 %
.02 - .03 1.3 6
.03 - .04 1.2 4
.04 - .05 1.1 3
.05 - .06 1.1 2.6
.06 - .07 1.0 2.3
.1.01.0010.5
0.6
0.7
0.8
0.9
1.0
Pb/C
Fe/C
Kulagin Predictions: Fe/C and Pb/C - ALL EVENTS - 2-cycle
x
R (A/C)
( running only) Q2 = 0.7 GeV2
Neutrino Scattering in the NuMI Beam
Add an run
Experiment: and on nuclear targets: Also measure d/dxdQ off, mainly, C Concentrate on careful measurement of
transition region In addition can extract all 6 structure
functions individual PDF's in a given x,Q bin.
,x Q2 , (1− )y 2( )G2 2πx
X = 0.1 - 0.125Q2 = 2 - 4 GeV2
(1-y)2
R = Rwhitlow
Neutrino1 year he-beam
Anti-Neutrino2 years he-beam
Neutrino Scattering in the NuMI Beam
Physics Results: High-xBj Parton Distribution Functions
The particular case of what is happening at high- xBj is currently a bit of controversial with indications that current global results not correct:
Drell-Yan production results ( E-866) may indicate that high-xBj (valence) quarks OVERESTIMATED.
A Jlab analysis of Jlab and SLAC high x DIS indicate high-xBj quarks UNDERESTIMATED.
≈ Statistical Errors for 1 year of he- xBj CH LH2 LD2
.6 - .65 0.6% 2.2% 1.5%
.65 - .7 0.7 2.6 1.7
.7 - .75 1.0 3.7 2.5
.75 - .8 1.3 5 3
.8 - .85 2 7 5
.85 - .9 3 11 7
.9 - 1.0 4 14 10
Measured / CTEQ6
CTEQ6
SLAC points
Might be d/u ratio
Neutrino Scattering in the NuMI Beam
Nuclear Effects with both and
First real measurement of flavor dependent nuclear effects of particular importance for neutrino scattering experiments.
Major difference in predictions Kumano (valence LESS shadowed than sea) vs Kulagin (valence MORE shadowed than sea) :