# Presentation: 792314

## MINERA will have the statistics to cover a wide variety of important  physics topics

**Main Physics Topics with Expected Produced Statistics**
**Quasi-elastic** - +n --> +p -  300 K events off 3 tons CH
**Resonance Production** - e.g. +N --->  /600 K total, 450K 1** **
**Coherent Pion Production** - +A -->  /25 K CC / 12.5 K NC
**Nuclear Effects** - C: 0.6M events, Fe: 1M and Pb: 1 M
- T and Structure Functions - 2.8 M total /1.2 M DIS events
- Strange and Charm Particle Production - (> 60 K **fully** reconstructed events)
- Generalized Parton Distributions - (few K events?)
_**MINER**__****__**A and Oscillation Physics - Debbie Harris**_

- Assume 9x1020 POT: 7**.0x**1020** in LE ********beam, 1.2x**1020** in sME ********beam and 0.8x**1020** in sHE ********beam**

-  Event Rates per fiducial ton
- Process		CC	  NC
- Quasi-elastic	103 K	  42 K
- Resonance		196 K	  70 K
- Transition		210 K         	  65 K
- DIS		420 K	125 K
- Coherent		 8.4 K	 4.2 K
**TOTAL****	****	****940 K****	****305 K**

**Typical Fiducial Volume = **
**3-5 tons CH,  0.6 ton C, ≈ 1 ton Fe **
**and ≈ 1 ton Pb**
**3 - 4.5 M events in CH**
**0.5 M events in C**
**1 M events in Fe**
**1 M events in Pb**

## Quasi-elastic  Scattering MINERA: 300 K events off CH and over 100 K off of Fe and Pb producedH. Budd and K. McFarland 

- Pure statistics

- Include Selection Criteria
-  1 or 2 tracks for Q2 < 1 GeV2  and 2 tracks for Q2 > 1 GeV2
-  1 long non-interacting track consistent with muon
-  Q2- 2M / error < 2.0  (xBj consistent with 1.0)
-  Q2-dependent missing pT cut
-  minimal number of hits in event not associated with  or p

-       Efficiency and purity function of E
- Average: eff. = 74 % and purity = 77%

- Expected MiniBooNe
- And K2K measurements

- Errors based on produced statistics

## Extraction of FA with Selected Sample

- Note that, even with the larger errors of the selected sample, MINERA will have the
- statistics and Q2 range to distinguish between the two different suggested Q2 behaviors.

**Expected MiniBooNe **
**and K2K measurements**

## Coherent Pion Production MINERA:  25 K CC / 13 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.
- Resulting sample is ≈ 5 K CC coherent events

- signal

- Selection criteria discussed at
- previous meeting

## Expected MINERA Results - Coherent Production

- Rein-Seghal

- Paschos-
- Kartavtsev

**Expected MiniBooNe **
**and K2K measurements**

- Errors now include estimated background subtraction

- MinerA

## Resonance Production - S. Wood and M. Paschos

- Total Cross-section and d/dQ2 for the ++ assuming 50% detection efficiency
- Errors are statistical only: 175K ++

- T

## Resonance Production - Nuclear Effects

- Adler, Nusinov, Paschos model (1974)

- One obvious omission, this model does not include
**hadron formation length corrections**

- +

- -

- LH on

- LH off

**MINER********A can measure L****H**** off of C, Fe and Pb**

- E = 5 GeV

- NEUGEN

- +

## Nuclear Effects MINERA: 2.8 M events off CH, 600 K off C and 1 M events off of Fe and PbS. Boyd, JGM, R. Ransome 

- Q2 distribution for SciBar detector

***MiniBooNE***
*From J. Raaf*
*(NOON04)*

- 	All “known” nuclear effects taken into account:
- Pauli suppression, Fermi Motion, Final State Interactions
-            They have **not included** low- shadowing that is only
-         allowed with axial-vector (Boris Kopeliovich at NuInt04)
- 	Lc = 2 / (m2 + Q2)  ≥  RA	**(not **m2**)**
-  _L__c__ __**100 times shorter with **_m_**allowing low **____**-low **__Q__2__** shadowing**_
**     **ONLY MEASURABLE VIA NEUTRINO - NUCLEUS
-     INTERACTIONS!**  MINER********A WILL **_**MEASURE**_** THIS **
**   ****ACROSS A WIDE **** AND **Q2** RANGE WITH  C : Fe : Pb**

- Problem has existed
- for over two years

- Larger than expected rollover at low Q2

## Example: MINERA Sensitivity to Nuclear Effects

- EHad (+3) - EHad (-3)} / EHad (-3)

- Use NEUGEN Monte Carlo model to study
-  intranuclear scattering and absorption
- D. Harris

- Study effects of  absorption

- Study  rescattering as f(A)

- Fe

- Pb

## If we take the projected MINERA results, how could it improve Neutrino Oscillation Experiments?

- Deborah Harris
- Fermilab

## BACKUP   SLIDES

## Strange and Charm Particle Production

**Existing Strange Particle Production**
- Gargamelle-PS - **15 ** events.   FNAL - ≈ 100 events
- ZGS - 7 events 	   BNL - 8 events
-       Larger NOMAD **inclusive** sample expected

**MINER********A Exclusive States**
**100x earlier samples**** **
**3 tons and 4 years**
- S = 0
- - K+  
- -  K+  
- - + K0  
- -  K+ p
- -  K+  p
- S = 1
- - K+ p 
- - K0 p 
- - + K0n 
- S = 0 - Neutral Current
- K+ 
- K0 
- K0 

- Theory: Initial attempts at a predictive phenomenology stalled in the 70’s due to lack of constraining data.
- MINERvA will focus on exclusive channel strange particle production - fully reconstructed events (small fraction of total events) but still.
**Important for background calculations of nucleon decay experiments**
- With extended running could study single hyperon production to greatly extend form factor analyses
- New measurements of charm production near threshold which will improve the determination of the charm-quark effective mass.

## 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 are 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
- CTEQ / MINERA working group to investigate high - xBj region.
- MINERA will have over 1.2 M DIS events to study high - xBj Close examination of the non-PQCD and pQCD transition region, in context  of quark-hadron duality, with axial-vector probe.

- Measured / CTEQ6

- CTEQ6

- SLAC points

- Might be d/u ratio

## Nuclear Effects

**Modified Interaction Probabilities**
- Shadowing Region (xBj < 0.1): Expect a difference in comparison to e/ - nucleus results due to axial-vector current and quark-flavor dependent nuclear effects.
- EMC-effect (0.2 < xBj < 0.7): depends on explanation of the effect
- Fermi Motion Effect (xBj > 0.7): should be the same as e-nucleus scattering
- With sufficient  measure flavor dependent effects.
- NC/CC off C, Fe and Pb
- Over 100 K CC and 30 K NC with EH > 5 GeV on Fe and Pb, times 3 for Carbon.

- S. Kulagin prediction for shadowing region

- Kumano fit for flavor-dependent effects

- xBj

- xBj

- xBj