# Presentation: 392110

## Workshop on Low-Energy Neutrino Nucleus Interactions:  Overview

- More detailed discussions with emphasis on implications for the MINOS Monte Carlo (NEUGEN) and subsequent analysis will take place at the April MINOS collaboration meeting.
- Roy Holt (Nuclear Physics Perspective), Jorge G. Morfín

## General Outline

- 60 Participants from Japan, States and Europe.
- Presentations:
**31 plenary talks**,
- 8 talks describing Monte Carlo generators,
- 7 theory benchmark calculations,
- 6 topics for panel discussions.
- Transparencies from 35 of the above already available on the web. **http://neutrino.kek.jp/~nuint01/program.html****	****	****	****	**
- Contributions to Proceedings due by end of February, to be published, perhaps, by the Fall.

## Topics Discussed

- Theory: Dynamics and kinematics of N (within a nucleus) interactions:
- Cross sections of exclusive states, (Rein-Sehgal augmented with 	calculations from 						Manny Paschos)
- Bridging the gap from resonance to DIS, (Duality results from Jlab)
- Global Boson-nucleus effects, (Shadowing, anti-shadowing, .S. Kumano and T. Thomas)
- Pauli suppression,
- Extended Fermi Gas model,
- Nuclear correlations,
- Hadron Formation Length and Nuclear transparency,
- Final State Interactions.

## Topics Discussed

- Experiment: What can we learn from eN (within a nucleus) interactions: (final state interactions the same)
- Jlab results with duality and e-Nucleus experiments,
- HERMES results with e-Nucleus.
- Experiment: What can we learn from N (within a nucleus) interactions:
- SKAT
- NOMAD (Veltri - events with multiple backward-going protons)
- K2K  (Walters - necessity of nuclear effects in quasi-elastic analysis)

## Topics Discussed

- Monte Carlo Generators:
- SUPER-K/K2K NUANCE
- SUPER-K/K2K  NEUT
- CHORUS
- NOMAD
- ICARUS
- MINOS NEUGEN
- MINIBOONE
**Dave Casper is organizing an Inter-Monte-Carlo working group to, eventually, produce a “universal” Monte Carlo employing the best of the existing MCs plus new input from nuclear physics theorists presented at this meeting.  They’ll present their conclusions at NuInt02.**

## Topics Discussed

- Future Facilities:
- CERN; mini factory
- FNAL; mini factory
- JHF
- Jlab, 12 GeV upgrade
- Future Experiments:
- K2K; new near detector
- Mini-ICARUS
- Second NuMI Near Experiment
**General Consensus: We need experimental input from ********nuclei experiments to completely understand these nuclear effects**.

## Proposal for a Study of -Nuclei Scatteringin the NuMI Beam

- Roy Holt - ANL and Jorge G. Morfín - Fermilab

## Study of -Nuclei Scattering in the NuMI Beam

- Collaboration of **nuclear** and **particle physics** communities led by Roy Holt (Argonne) and J.G.M (Fermilab).
- Nuclear community already shows considerable interest:
-  **Argonne National Lab, Colorado, Illinois, Indiana, Los Alamos National Lab, Rutgers****	****	****	****	****	****	****	**
- Goal is to sign up many MINOS collaborators and add more NP.
- Submit Proposal to the Fermilab PAC in 2002.
- Start running parasitically with MINOS in 2005 time scale.
- Neutrinos only, emphasis on low energy running
- Run as prime users perhaps starting in 200?.
- Higher Energy running with  and 

## Neutrino Event Energy Distributions and Statistics 

- le-configuration: **Events**-  	Epeak = 3.0 GeV, <E> = 10.2 GeV, rate = 62 K events/ton - 1020 pot.
- me-configuration: **Events**- 	 Epeak = 7.0 GeV, <E> = 8.5 GeV, rate = 215 K events/ton - 1020 pot.
- he-configuration: **Events**- 	 Epeak = 12.0 GeV, <E> = 13.5 GeV, rate = 515 K events/ton - 1020 pot.
- Reasonably expect (3-3.5) x 1020 pot per year of NuMI running --> multiply above rates by a factor ≥ 3.

**With E-907 at Fermilab to measure particle**
**spectra from the NuMI target, expect to know **
**neutrino flux to ****±**** **_**5%.**_

## Parasitic Running with MINOS

- Two phases:
**Run parasitic to MINOS experiment using MINOS designated beam**.
- Have control of energy and flavor of neutrino beam.
**Physics Goals: Parasitic Running**
- High statistics study of Quasi-elastic channel to extract s.
- Measure -nucleus nuclear effects (CH, C, Fe and W targets).
- Measure d/dxdQ2 off a variety of nuclei.
- Anti-shadowing with neutrinos?
- A-dependence of neutrino EMC-effect?
- (Study of -resonance production off various nuclei.)

## Parasitic Running: Event Energy Distribution

- MINOS oscillation experiment uses mainly le beam with shorter me and he runs for control and minimization of systematics.
- An example of a running cycle would be:
- 12 months le beam
- 3 months me beam
- 1 month he beam
- Assuming 2 such cycles (3 year run) with 3x1020 protons/year: **950 K events/ton**.  <E> = 10.5 GeV (with semi-me/he beams this becomes 800 K events/ton**)**

## Parasitic Running: Event Kinematic Distributions

- Total of **0.95 M events/ton**.
**DIS** (W > 2 GeV, Q2 > 1.0 GeV2) :   **0.40 M events / ton**.
**Quasi elastic**: **0.15 M events / ton.****	****	**
**Resonance ****+ “Transition” **: **0.40 M events / ton****	****	****	**
- Recalculating for semi-me/he beams.

- David Potterveld - ANL

## Prime User of the NuMI Beam

- Two phases:
- Run parasitic to MINOS experiment using MINOS designated beam.
**Have control of energy and flavor of neutrino beam.****	****	**
- Physics Goals: Prime User
- Continue measurement of -nucleus nuclear effects.
- Measure d/dxdQ2 and d/dxdQ2 off of CH, C, Fe and W targets:
**Shadowing, anti-shadowing and EMC-effect with neutrinos and anti-neutrinos**
_**Measure nuclear effects on NC/CC ratio in **__****__** and **__****__** to check NuTeV 3**__****__** effect!!**_
- Extract F2 (x,Q2) and xF3 (x,Q2) off of these nuclei:
**Measure nuclear effects off valence and sea quarks independently**
- With sufficient statistics and control of systematics extract all 6 structure functions.

## Prime User: Event Energy Distribution

- Run he beam configuration only!
- For example, 1 year neutrino plus 2 years anti-neutrino would yield:
- 1.6 M   - events/ton
- 0.7 M   - events/ton
- The energy distribution of neutrino events is at right. <E> = 13.5 GeV

## Prime User: Event Kinematic Distributions

- Distribution for 1 year  running.
- Using the same definition: 	**DIS** (W > 2 GeV, Q2 > 1.0 GeV2): 				  0.9 M  and .35 M  events / ton.
- In the shadowing region (x < 0.1):	0.35 M events/ton

- David Potterveld - ANL

## Detector: Conceptual Design

- 2m x 2 cm x 2cm scintillator (CH) strips with fiber readout.
- Fiducial volume: r = .8m  L = 1.5:   	3 tons of scintillator
- Downstream half:  pure scintillator
- Upstream half: scintillator plus ≈1 cm thick planes of C, Fe and W.
- 8 planes C  = 0.37 ton (+Scintillator)
- 3 planes Fe = 0.47 ton (+MINOS)
- 2 planes W = 0.77 ton
- Readout: combination of VLPC and MINOS multi-anode PMT system.
- Use MINOS near detector as muon identifier / spectrometer.

## Detector: Event Rates

- Event rates (3 x 1020 protons per year)
-               **Parasitic Running ****(3 years)**		**Prime User ****(1 year, ********)**
- CH		2.85 M					4.80 M
- C			0.35 M					0.59 M
- Fe			0.45 M					0.76 M
- W			0.73 M					1.23 M
- Multiply Parasitic values by
- 0.85 for semi-me/he running

## Physics Goals: s -- Roy Holt, ANL

**Strange Spin of the Proton.****	****	**
- Status s = - 0.12 ± 0.03, BUT:
- Large x --> 0 extrapolation
- Assume SU(3) symmetry
- Factorization in semi-inclusive DIS
- Neutrino NC Scattering yields s directly.
- Measure: 			 	p --> p / n --> p

## Physics Goals: Nuclear Effects 1

- Compare characteristics of N events where N is CH, C, Fe and W.
- Look at multiplicities, the ratio of charged to neutral energy, neutrino energy distribution, muon 3-vector, hadron shower 3-vector.
- Perhaps compare quasi-elastic production off of N.

## Physics Goals: Nuclear Effects 2

- S.A.Kulagin has  calculated shadowing for F2  and xF3 in -A interactions based on a non-perturbative parton model.
- At 5 GeV2 , ratio of shadowing xF3 : F2  ≈ 0.5 at x = .02 to ≈ 2 at x = .0001.
- Most recently calculated shadowing in VMD region (lower Q2 : dominant for x < .01) and finds significantly stronger shadowing.

## Physics Goals: Nuclear Effects 

- Following figures are for 2 years and 4 yearsevents.
- Taking ratios allows for cancellation of beam systematic effects.
- Assume relative target systematics same as Tevatron Muon Experiment - order (1-2)%.

## Physics Goals: Six Structure Functions

- (1- y)2

- X = 0.1 - 0.125
- Q2 = 2 - 4 GeV2

- + y2 FL

## What Can We Learn With All Six Structure Functions?

- Does s = s and c = c  over all x?
- If so.....
- 

- Leading order expressions:

## Summary

- Forming Collaboration of Nuclear and Experimental Particle physicists for a Second NuMI Experiment.
- MANY THESIS TOPICS !!
- Study s, nuclear effects in N events(N is CH, C, Fe and W).
- Study nuclear effects in NC/CC to check sin2(W) measurement.
- Study nuclear effects of valance and sea quarks independently.
- Extract high precision structure functions,isolate individual pdfs.
- Submit proposal 2002, run parasitic with MINOS starting ≈ 2005, prime users in 2008 timeframe.
- We will distribute written summary of physics goals, detector requirements and expected statistics,	 					**We Invite YOU to join us!**