# Presentation: 875383

## PRD Paper by the DONUT Collaboration: 

- G. Tzanakos, Univ of Athens
-  DONUT Analysis Meeting, Nov 13, 2003

**“****A Measurement of nutau CC total Cross Section” **
_***CONTENTS***_**   (Sections)**
- INTRODUCTION
-  THE NEUTRINO BEAM
-  HYBRID EMULSION SPECTROMETE
- SPECTROMETER ANALYSIS
-  EMULSION ANALYSIS
-  COMBINED ANALYSIS
-  CROSS SECTION MEASUREMENT
-  REFERENCES

## I.  INTRODUCTION

-  Physics Intro, Significance, connection to tau lepton
-  Indirect evidence from e+e- experiments: Michel parameters from
- PETRA, TRISTAN, LEP, CLEO
-  Previous attempts of nutau detection, previous experiments
-  Plan of cross section measurement
-  Structure of the paper

## II. THE NEUTRINO BEAM

-  Beam Dump, Structure, goals, ref to previous beam dumps
-  Overall schematic (layout), description			**FIG**
** **Problems (neutrons, gammas), Fixes
-  MC Calculation of fluxes
-  Muon energy spectrum					**FIG**
-  Muon energy spectrum at target area (L = 35 m)		**FIG**
-  Muon flux sources, neutrino  flux sources, MC  predictions
-  Neutrino energy spectra					**FIG**
-  Neutrino energy spectra at target				**FIG**
-  Neutrino (interacted) energy spectra at Emulsion target	**FIG **
-  All spectra separate for numu, nue, nutau, numu non-prompt **FIG**

## III. HYBRID EMULSION SPECTROMETER

-  Description, overall schematic, goals			**FIG**

_**Target **_**  (****To be abstracted from NIM Paper****)**
- Description, schematic, goals,				**FIG**** **
-  Emulsion target types					**FIG**
-  Preparation, processing, alignment, background sources
-  Readout, image processing, segment reconstruction	**FIG**
-  Spatial resolution, reconstruction efficiency

## Target (Continued)

-  Track detection efficiency vs no of segments		**FIG**
-  Vertex detection efficiency vs no of “tracks”		**FIG**
-  Vertex background vs no of  “tracks”			**FIG**
-  Vertex detection efficiency vs neutrino energy		**FIG**

## b.  Scintillating Fibers

-  Structure, Schematic, goals					**FIG**
-  Readout with II, FADCS, Imaging
-  “Hit” definition (position, energy)
-  Tracking with SciFi, resolution
-  Efficiency vs Ecut, no. of hits
-  Vertex reconstruction, resolution

## SPECTROMETER (From NIM Paper)

**Magnet****,** PT kick
**DRIFT chambers** (refs)
- Description, electronics, readout
- Track reconstruction, resolution				**FIG**
- Tracking efficiency					**FIG**
- Systematics
**EMCAL**
- Description, schematic					**FIG**
- Calibration, Energy Resolution, Position resolution
- Shower Reconstruction, clustering
- e-ID, gamma ID

## Muon  Identifier

** **Muon reconstruction, resolution, ID, efficiency
**Trigger**
-  Trigger counters, trigger types
**General**
-  Acceptance
-  Trigger efficiency vs neutrino energy: numu, nue, nutau	**FIG**
-   e/pi/mu separation efficiencies vs energy			**FIG**

##  Data collection

-  Calibration runs
-  Calibration EMCAL					**FIG**
-  Alignment, SciFi, Emulsion, Spectrometer		**FIG**
- General plan of the analysis
-  Goals: Neutrino interaction detection, vertex prediction in spectrometer, vertex location in emulsion, muon ID, e-ID, Decay search, momentum measurement, neutrino event ID for (i) located and (ii) non-located events, background estimation

## IV.  SPECTROMETER  ANALYSIS

-  Data reduction, analysis filters, visual scan, selection by ANN
-  Data and MC
-  Event reconstruction in spectrometer
-  Momentum and energy measurements
-  Vertex prediction
-  Quality of reconstruction (resolution, systematics)		**FIG**
-  Efficiency of reconstruction vs visual energy		**FIG**

## V.  EMULSION ANALYSIS

-  Emulsion scanning
-  Event location, efficiency vs number of tracks 	**FIG**
-  Efficiency vs position in target			**FIG**
-  Efficiency vs Evis					**FIG**
-  e-ID from the emulsion mesurements, efficiency	**FIG**
-   Distortion corrections
-  Momentum measurement from emulsion		**FIG**
-  Validation from test beams				**FIG**
-  Comparison with spectrometer momentum meas	**FIG**
-  Decay search, efficiency				**FIG**

## Numu, Nue, NC Events

**Numu, Nue, NC Events**
-  Neutrino event ID for located and non-located events
- numu-ID, Nue-ID, NC (non-located events)
-  numu-ID, Nue-ID, NC-ID for located events( use info from spectrometer and emulsion
- 	(Selection criteria, numu-ID from Muon-ID and ANN,
- 	 numu prompt vs non-prompt,
- 	 nue from emulsion and spectrometer (ANN),  NC from ANN)

##  	Nutau-events, Backgrounds

-  	**Nutau-events, Backgrounds**
-  kink and multiprong decay events from decay search
-  Backgrounds
-  Selection criteria for tau, charm, scatter
-  Cuts, parameter analysis, ANN				**FIGS**
-  Final sample: Non-located events (numu, nue, NC)   	**TAB**
-  Final sample: located events
- 	- numu, nue, NC, nutau, charm,
- Efficiencies

## VII.  CROSS SECTION MEASUREMENT

-  Estimate number of numu, nue, NC from efficiencies
-  Visible energy distributions for  numu, nue, NC	**FIG**
-  Compare with MC distributions			**FIG**
-  Do combined fit with folded in known cross sections
-  Extract neutrino flux
-  Estimate total nutau CC cross section
-  Use charm to compare and cross check

## VII.  REFERENCES