# Presentation: 117975

## WG2 Summary

- Conveners: R. Ball, M. Sakuda, S. Zeller
**NuFact05 Workshop**
- June 25, 2005

**Experimental Results ****(Zeller)**
-      - achievements & plans
**2.** **Theoretical Results ****(Sakuda)**
**	**- achievements & plans

**Neutrino Scattering Physics**

## Where We Are Headed

- (bubble chamber exps)
- Low E
- - low statistics
-  1st  measurements
-  70’s, 80’s

- DIS
- High E
- - high statistics
- probe nucleon structure
-  80’s, 90’s

- Future Dedicated
-  Experiments
- Low E
-  fine-grained detectors
-  MINERvA

- Present Day
-  Oscillation Exps
- Low E
-  more intense  beams
-  new  data
-  (higher stats, quality than existing data)
-  revisit  measurements
- MiniBooNE, K2K

-  factory?
- superbeams? p driver?
-  beams?
-  SNS
-    lAr ?

## Low Energy Neutrino Scattering

**MINOS, MINERvA**

**K2K, NOvA**

**MiniBooNE, T2K**

**Super-K atmospheric ******

**QE**

**1******

**DIS**

- event samples observed
-    at these experiments
-         are a mixture

## Why Low Energy  Measurements are Important

-  **imperative for future osc exps: need to precisely**
**  ****predict both signal & background rates**
-     - QE necessary to accurately predict signal rates in osc exps
-     - need to know NC 0 backgrounds for      e
-     - need to know CC + backgrounds for  disappearance
-     -  cross sections for CP violation searches
-  **interesting in their own right**
-  **combination has** **increased effort towards obtaining **
**   ****more precise low energy ************  measurements ...**

## WG2 Scattering: Status of Current Measurements

-  **electron scattering at JLAB** (A. Bodek)
-  **K2K** (L. Ludovici, M. Sakuda, F. Sanchez)
-  **MiniBooNE** (I. Stancu, J. Monroe, M. Wascko)
-  **MINOS** (A. Marchionni)
-     -  beam commissioned in Jan 2005
-      - first beam events in near/far detectors
-      - look forward to future  scattering
-        results from MINOS near detector

- in all cases
- new results
- shown here
- at NuFact!

## New Electron Data from JLAB

**             ****JUPITER** e-A (A. Bodek)
-    -  osc exps use nuclear targets (need accurate nuclear models;
-      rely on higher statistics e-A measurements)
-    - collaborative program linking
-      e- and  communities
-    - took data in January 2005
-       (1st look at this very preliminary
-         data here at NuFact!)
-     - dedicated low Q2 electron
-       meas for community
-     - goal: fast track 5%  measurements
-       (supply an important cross-check of models)

## Results From K2K

-  new results on coherent
-   charged pion production (F. Sanchez)
-  MA from QE event sample (M. Sakuda)

- from fine grained
- K2K near detectors

## K2K Coherent Production

-  “search for coherent charged pion production in neutrino-carbon
-    interactions” (hep-ex/0506008, submitted to PRL)

- (F. Sanchez)

-  neutrino coherently scatters off nucleus
-    - negligible E transferred to target
-    - distinct: low Q2, very forward 
-       (compared to resonantly prod ’s)
-  model predictions for this process
-   vary widely (x 10)

## New K2K Coherent + Results

-  select an enriched
-  coherent  sample
-  by selecting events
-  w/ low vertex activity
-  (expect small nuclear recoil)
-  low Q2 is region where
-   expect coherent  production
-  report no evidence for
-   coherent  production
-   from K2K data

- (F. Sanchez)

## New K2K Coherent + Results

-  based on this, set a limit (1.3 GeV, coherent is < 0.6% of  CC )
-  this is the 1st coherent  prod measurement below 2 GeV;
-   much interest & lively discussion in WG2
-  will be interesting to compare to anticipated meas from MiniBooNE

- (F. Sanchez)

## K2K MA from QE n      -p

-  extract axial vector mass, MA, from QE data in SciFi detector
-   (fundamental parameter in predicting shape, norm of QE )

- (M. Sakuda)

-  effect on MA from:
-     - updated vector FF
-     - new coherent 
- - K2K is 1st meas
-   of MA on H2O target
-  part of important
-   effort aimed at
-   improving knowledge
-   of MA (and QE )
-   on nuclear targets

## New Results From MiniBooNE

-  high purity  N      - N +
-   (CC 1+) sample can be selected
-   w/ simple requirement that events
-   have 2 decay (Michel) electrons
-  5x more CC 1+ data than all previous exps combined

-  new CC scattering results from
-   MiniBooNE experiment   (J. Monroe,
- 			    M. Wascko)
-                  - Cerenkov detector
-                  - high statistics samples
-                    of CC QE & CC 1+ events

## MiniBooNE CC +/QE

- (J. Monroe)

- 1st look at ratio of CC 1+/QE
-  cross sections as function of E
- from MiniBooNE CC data
-   - provide important input
-     for  simulations

-  can also multiply ratio by QE  prediction
-   to extract CC + cross section
-  first measurement at low E on nuclear target (CH2)

- (J. Monroe)

## WG2 Scattering: Future Initiatives

-  **MiniBooNE  ********  running, SciBar** (M. Wascko)
-  **MINERvA** (J. Nelson)
-  **SNS** (I. Stancu)
-  ****** ****beams** (C. Volpe)
-  **liquid Argon detection** (B. Fleming, A. Meregaglia)

## Future: MiniBooNE Running

- (M. Wascko)

-  antineutrino  data less abundant
-  especially need low E measurements
-   (where there is currently no data)
-   → important for future CP searches
-          P(→ e) ≠ P( → e)
-  MiniBooNE expects ~10k   QE
-   in 1 year (after cuts), E ~ 0.8 GeV
-  developed several new techniques for
-   measuring  contamination in   beam
-   (“poor man’s sign selection”; no B field)

## Future: Bringing K2K SciBar Detector to Booster  Beamline

-  window of opportunity to bring fine-grained K2K SciBar to BNB
-  proposal recently submitted to Fermilab
-      - measurements to aid MiniBooNE
-        (in its capacity as near detector)
-      -  cross section measurements for T2K

- (M. Wascko)

## Future: MINERvA Experiment

- (J. Nelson)

-  add’l near detector in NuMI beam line
-  high statistics neutrino samples
-   at a variety of beam energies
-   (16 x 1020 POT in 4 years)

-  fully active, fine grained detector
-  multiple nuclear targets (C,Fe,Pb)

## Future: MINERvA Experiment

- (J. Nelson)

-  impressive laundry list of neutrino scattering measurements
-   that can be studied with unprecedented detail ...

-  construction in late 2006
-  commissioning end of 2008

## Future: Even Lower Energy (SNS)

-  also effort to extend  scattering activity down to even lower E’s (5-50 MeV)
-         - orders of magnitude lower than what we’ve been talking about
-         - valuable for SN modeling and constraining nuclear models

-  build 20 ton neutrino
-   detector at SNS (~1000 evts/yr)
-  DAR well known  spectra,
-   separate  flavors w/ timing cuts
-  submitting proposal to DOE
-   end of this month (start mid 2009)

- (I. Stancu)

## Future:  Beams

-  complementary to SNS:
-   possibility for low energy
-   beta beams (10 -100 MeV)

- (C. Volpe)

-  effort to span important gap between reactor and accelerator-based
-   neutrino-nucleus interactions (where very few existing measurements)

## Future Detection: Liquid Argon 

-  potential for vast improvement in  scattering measurements using
-   extremely high resolution lAr detectors ...

-  detailed studies of embedding inner water target
-   (T2K, to aid in relating O and Ar measurements)
-                        (A. Meregaglia)

-  more precise  measurements;
-   superior final state particle ID,
-   improvements in neutron detection,
-   +  mag moment (B. Fleming)

## WG2 Achievements: Exp’l Meas

-  K2K and MiniBooNE filling in gap in our knowledge
-   of low energy neutrino scattering (and cross sections)
-              - saw several new results this week
-              - a lot of firsts (measurements in regions where previously no data)
-  precise measurement of these ’s, kinematic distributions
-   will be an even more critical ingredient for future osc exps
-  look forward further advancement w/ MINERvA in near future
-   (and at even lower E’s: SNS,  beams?)
-  surveyed the landscape ... what’s next after these exps?

## WG2 Plans: What’s Next?(questions for NuFact06)

-  after K2K, MiniBooNE, MINERvA, what more will we
-  need to know?
-     - what other  scattering measurements can & should
-       be made that won’t be covered by this menu?
-     - what add’l info will be needed by future  osc exps
-       that we won’t have in hand?
-  3 parts: beams, targets, detectors
-               J. Morfin plenary

## WG2 Plans: What’s Next?(questions for NuFact06)

-  **neutrino beams:**
-     - add’l   measurements? (post MiniBooNE)
-     - direct meas of (unosc) e ’s (>reactor E)? (SNS,  beam)
-     - add’l dedicated hadron production exps? (post HARP, MIPP)
-        (for precise , need precise knowledge of beam itself, do we have enough info?)
-     - narrow band beams for detailed NC studies
-  **neutrino targets:**
-     - high stats light target measurements (H2, D2)
-     - polarized targets?
** ****improved detector technology:**
-     - next generation detectors? (lAr) + ??

## Thank You!

-  would like to thank all of the
-   WG2 speakers & participants
-  would like to extend a
-   sincere thank you to
-   V. Palladino & INFN
-   for the **very generous**
-   travel support which made
-   it possible for several
-   WG2 speakers/participants
-   to attend this workshop

## Backup Slides

## MiniBooNE CC +

- (J. Monroe)