# Presentation: 845533

## The MIPP experiment and its application to neutrino beam simulations

- Andrew Godley
- on behalf of the MIPP Collaboration:
- Colorado, Fermilab, Harvard, IIT, Iowa, Indiana, Livermore, Michigan,
- South Carolina, Virginia

- APS Dallas, TX
- April 2006

## MIPP overview

- Measure particle production off various nuclei
- Incoming beam of π±, K± and p± from 5 to 80 GeV/c and primary p beam from the Main Injector
- Large acceptance spectrometer including a Time Projection Chamber
- Example physics topics
- Hadronic fragmentation – test scaling law of particle fragmentation
- Light meson spectroscopy
- Nuclear scaling, strangeness production
- Proton radiography
- Neutrino physics – more later

## The MIPP Spectrometer

- TPC PID: < 1 GeV/c

- DCKOV PID: 3-17 GeV/c

- TOF PID: 1-3 GeV/c

- RICH PID: 20-80 GeV/c

- EMCAL

- HCAL

- Wire Chambers

- Wire Chambers

- JGG Analysing
- Magnet 0.6T

- Rosie Analysing
- Magnet 0.5T

- Physicists

## Application to neutrino experiments

- Hadron production is largest uncertainty in neutrino flux prediction
- Existing hadron production data sparse
- Measure production from NuMI target
- Use event by event measurement as input to NuMI beam simulator (replace Fluka target)
- Also thin C, Al and Be targets
- Combine thin and thick target data to benchmark cascade calculations in thick targets

- Distribution of hadrons decaying to produce
- neutrinos at the MINOS near and far dectors

## Data collected

- Ran throughout 2005 and first two months of 2006
- 5 thin targets Be, C, Al, Bi, U
- 7 million Liquid Hydrogen events
- 1.78 million events on the NuMI target
- 14 million events with no TPC (faster data rate) for Kaon mass measurement from RICH ring diameter
- First reconstruction pass completed – DST produced for analyses

- GeV/c

## Beam particle ID and trigger

- Need to tag incoming particle, use two upstream Cerenkov detectors
- >85% purity (tested with RICH)
- Can use beam TOF for 5 GeV/c
- Added small scintillator trigger behind thin targets
- Combined with multiplicity in first drift chamber
- Purpose built scintillator trigger for NuMI target

- PRELIMINARY

## TPC and tracking

- Raw TPC data, form clusters of hits in Z slices, then form tracks and vertex
- 6 wire chambers for high momentum tracking

## Particle ID

- TPC dE/dx already shows good Pi/K/P separation
- RICH particle ID also in good condition

**D**

- PRELIMINARY

- TPC dE/dx

## NuMI target data

- Beam aligned Δx=0.002 cm Δy=0.051 cm
- Total positive tracks, Pions and Kaons identified by the RICH

- PRELIMINARY

## Early MIPP Physics - HBT

- HBT effect, pions preferentially emitted together
- Plot transverse momentum between a pion and all other pions in event - Dependent
- Compare to transverse momentum from pions in different events – Independent
- Look for excess at low pT in ratio of Dependent/Independent
- Seen in MIPP with Kaons and Protons too with broader peaks
- Calculate radius of particle interaction from interference peak
- Gamov correction for charge repulsion required

- pT (GeV/c)

- PRELIMINARY

- Pions

- Protons

## MIPP upgrade

- Hard at work finishing reconstruction and analysing data but also working towards upgrade of MIPP
- Fifty fold increase in data taking rate
- Upgraded hardware
- TPC readout electronics limit data taking – use ALICE chips
- JGG magnet repair
- Larger veto wall
- Beamline optics and shielding
- Physics
- More NuMI target statistics, NOvA target and others
- Pi and K production cross sections on liquid nitrogen for atmospheric neutrinos
- Higher statistics for hadron shower simulations – ILC
- Limiting factor is manpower, new collaborators welcome!