Physics - Detector Optimization Studies NuInt05 Highlights

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Physics - Detector Optimization StudiesNuInt05
Highlights

• Jorge G. Morfín
• Fermilab

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T.J. Sarlina
What is Value Engineering (VE)? (1)  Its a way
of determining the basic function of an item.
(2)  Its a way of evaluating high cost areas
and systematically reducing those costs. (3) 
Its a way of analyzing a problem area and
developing alternative ways of resolving the
problem. (4)  Its a way of selecting the best
possible alternative to perform the basic
function at the lowest cost.  Value Engineering
thus extends financial, manpower, and material
resources.
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Value Management (VM) principles are essential to
proper program management and have been
incorporated from the early design and
development stages of the technical requirements.
These principles have also been employed as the
cost and schedule parameters matured over time.
Use of the VM approach provides a systematic
framework to analyze the functions of systems,
equipment, facilities, services, and supplies for
the purpose of achieving the essential functions
at the lowest life cycle cost consistent with
required performance, quality, reliability and
safety. VM elements have been incorporated as a
part of each of the technical and program reviews
to date.
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VM Examples

• Anything with 2 or more vendor quotes
• Reuse of existing materials
• Determining physics drivers for nuclear targets
• PMTs on top or bottom
• Need for a Coil
• Granularity - size of triangles
• Off-the-shelf purchase vs custom equipment

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What this means for us.

• Short concise document for each physics-channel
  study containing
• Description of physics goals
• What components of detector used in the analysis
• Technical requirements/detector response to meet
  the physics goals
• Description of how detector response depends on
  design modifications
• Description of how physics results depend on
  design modifications

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Coherent Pion Production MINERnA 85 K CC / 37
K NC CH and 25 K (50K) CC / 13 K (25K)NC Fe
(Pb)H. Gallagher
Selection criteria reduce the signal by a factor
of three - while reducing the background by a
factor of 1000.
Selection criteria discussed at previous meeting
signal
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Expected MINERnA Results - Coherent p Production
Errors now include estimated background
subtraction
Rein-Seghal
Paschos- Kartavtsev
MINERnAs nuclear targets allow the first
measurement of the A-dependence of scoh across a
wide A range
MinernA
Expected MiniBooNe and K2K measurements
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Coherent production Changing strip size
I have run my coherent code with new resolutions
based on the changes mentioned here. If I
understand correctly, in trial (1) I should be
degrading the angular resolution by 4 and in
trial (2) I should be improving it by 3. I
have taken the nominal smearing to be 0.5 degrees
so these would give 0.52 deg and 0.485 deg
respectively. I am really surprised that the
angular resolution changes so little for such
large changes in the strip size. Degradation
at this level has essentially zero impact on the
coherent analysis as far as I can tell. The
changes I get in the number of events passing
cuts where I have smeared the reconstruction
using these new numbers is on the same order as
the statistical uncertainty in the MC sample I
have handy, which is around 2.5.
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Recent K2K SciBar ResultM. Hasegawa et al. - hep
- ex/0506008

• Expect 470 CC coherent events according to
  Rein-Sehgal
• Find 7.6 50.4

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MINER?A CC Quasi-Elastic MeasurementsFully
simulated analysis, - realistic detector
simulation and reconstruction

• Quasi-elastic (n n --gt m- p, around 800 K
  events)
• Precision measurement of s(En) and ds/dQ
  important for neutrino oscillation studies.
• Precision determination of axial vector form
  factor (FA), particularly at high Q2
• Study of proton intra-nuclear scattering and
  their A-dependence (C, Fe and Pb targets)

Average eff. 74 and purity 77
Expected MiniBooNE and K2K measurements
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Lar TPC Evt 3 QUASI ELASTIC (2.5)

• Proton K.E. dominated by
• the requirements
• K.E. gt 50 MeV
• Full containment

61 events - 73 expected from MC
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NOMAD The sleeping giant wakesslowly
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NOMAD Staatistics and Physics program
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NOMAD QE event
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NOMAD QE result
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Resonance Production - DS. Wood and M. Paschos
Total Cross-section and ds/dQ2 for the D
assuming 50 detection efficiency Errors are
statistical only 175K D
sT
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MiniBooNe CCp Measurement
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Nuclear Effects MINERnA 2.8 M events off CH,
600 K off C and 1 M events off of Fe and PbS.
Boyd, JGM, R. Ransome
Q2 distribution for SciBar detector
Problem has existed for over two years
All known nuclear effects taken into
account Pauli suppression, Fermi Motion, Final
State Interactions They have not
included low-n shadowing that is only
allowed with axial-vector (Boris Kopeliovich at
NuInt04) Lc 2n / (mp2 Q2) RA (not mA2)
Lc 100 times shorter with mp allowing low n-low
Q2 shadowing ONLY MEASURABLE VIA NEUTRINO -
NUCLEUS INTERACTIONS! MINERnA WILL MEASURE
THIS ACROSS A WIDE n AND Q2 RANGE WITH C
Fe Pb
Larger than expected rollover at low Q2
MiniBooNE From J. Raaf (NOON04)
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NuInt05 - Nuclear Effects
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High xBj parton distributionsHow well do we know
quarks at high-x?

• Ratio of CTEQ5M (solid) and MRST2001 (dotted) to
  CTEQ6 for the u and d quarks at Q2 10 GeV2.
  The shaded green envelopes demonstrate the range
  of possible distributions from the CTEQ6 error
  analysis.
• Recent high-x measurements indicate conflicting
  deviations from CTEQ E-866 uV too high, NuTeV
  uV dV too low
• CTEQ / MINERnA working group to investigate
  high-xBj region.

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Indication that the valence quarks not quite
right at high-x??E866 -Drell-Yan Preliminary
Results (R. Towell - Hix2004)
xbeam
xtarget

• xbeam distribution measures 4u d as x--gt 1.
• Both MRST and CTEQ overestimate valence
  distributions as x --gt 1 by 15-20.
• Possibly related to d/u ratio as x --gt 1, but
  requires full PDF-style fit.
• Radiative corrections have recently been
  calculated. (Not yet fully applied)

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NuTeV Compared to CCFR (currently in PDF fits)at
High-x Indicates Effect Opposite to E866
nuclear effects?
V. Radescu - DIS04
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NOMAD Analysis - NOT DATA YETTwist -6 is required