Preliminary Ideas for a Near Detector at a Neutrino Factory Neutrino Factory Scoping Study Meeting...
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![Page 1: Preliminary Ideas for a Near Detector at a Neutrino Factory Neutrino Factory Scoping Study Meeting 23 September 2005 Paul Soler University of Glasgow/RAL.](https://reader035.fdocuments.in/reader035/viewer/2022062421/56649d4e5503460f94a2e056/html5/thumbnails/1.jpg)
Preliminary Ideas for a Near Detector Preliminary Ideas for a Near Detector at a Neutrino Factoryat a Neutrino Factory
Preliminary Ideas for a Near Detector Preliminary Ideas for a Near Detector at a Neutrino Factoryat a Neutrino Factory
Neutrino Factory Scoping Study Meeting
23 September 2005Paul Soler
University of Glasgow/RAL
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Neutrino Factory Scoping Study Meeting CERN 22-23 September
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ContentsContents
1. Near Detector Aims2. Flux normalization3. Cross-sections4. Parton Distribution Functions5. Charm production6. Sin2w
7. Possible near detector technologies7.1 Silicon tracking detector7.2 Liquid argon TPC or other technologies
8. Conclusions
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1. Near detector aims1. Near detector aims Long baseline neutrino oscillation systematics:
– Flux control and measurement for the long baseline search.– Neutrino beam angle and divergence– Beam energy and spread– Control of muon polarization
Near detector neutrino physics:– Cross-section measurements: DIS, QES, RES scattering– sin2W - sin2W ~ 0.0001– Parton Distribution Functions, nuclear shadowing S from xF3 - S~0.003– Charm production: |Vcd| and |Vcs|, D0/ D0 mixing– Polarised structure functions– polarization– Beyond SM searches
General Purpose Detector(s)!!
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2. Flux normalisation (cont.)2. Flux normalisation (cont.)
e
e
e
e
Neutrino beams from decay of muons:
Spectra at Production (e.g. 50 GeV) Number CC interactions
Polarisation dependence
P=+1: gone!
Need to measure polarization!!
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2. Flux normalisation (cont.)2. Flux normalisation (cont.)
Rates:— E = 50 GeV
— L = 100 m, d = 30 m— Muon decays per year: 1020
— Divergence = 0.1 m/E
— Radius R=50 cm
100 m
E.g. at 25 GeV, number neutrino
interactions per year is:
20 x 106 in 100 g per cm2 area.
Yearly event rates
High granularity in inner region
that subtends to far detector.
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2. Flux normalisation (cont.)2. Flux normalisation (cont.) Neutrino flux normalisation by measuring: Signal: low angle forward going muon with no recoil Calculable with high precision in SM
Same type of detector needed for elastic scattering on electrons:
ee
)(2)( 2
22
22
LABinEmG
mq
msG
dy
edeF
W
WFCC
2412
104.02
)( cmGeV
EEmGe eF
CC
ee ee
)()(
ee )()(
)1(22 ymE ee
E.g. CHARM II obtained value of sin2W from this
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3. Cross sections3. Cross sections
Measure of cross sections in DIS, QE and RES. Coherent Different nuclear targets: H2, D2
Nuclear effects, nuclear shadowing, reinteractions
With modest size targets can obtain very large statistics
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4. Parton Distribution Functions(s)4. Parton Distribution Functions(s) Unpolarised and Polarised
Structure functions S from xF3 - S~0.003 Sum rules: e.g. Gross-Llewelyn
Smith polarization: spin transfer from
quarks to — NOMAD best data— Neutrino factory 100 times
more data
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mixing: doubly Cabbibo suppressedSM very small, new physics
Babar: Rmix<4x10-3 (90% CL) hep-ex/0408066
5. Charm Production5. Charm Production Charm production: Measure of Vcd and strange quark content nucleon 6-7% of cross-section at 20 GeV3% CC events:
about 3x107 charm states per year
...,,,, 00 csDDDD
McFarland
00 DD
Tagged sample
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6. sin6. sin22 ww
Elastic scattering off electrons:
Deep inelastic scattering: NC/CC Good statistical accuracy on sin2W (~0.5x10-4) but hadron uncertainties dominate
sin2W ~ 0.0001
ee ee ,
)(
,
)(
2231241106.1)( cmgg
GeV
Ee RLCC
36.0)()(
)()(
eCCCC
eNCNCR
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High granularity in inner region that subtends to far detector. Very good spatial resolution: charm detection Low Z, large Xo Electron ID Does the detector have to be of same/similar technology as far detector?
7. Near detector technologies7. Near detector technologies
Does not need to be very big (eg. R~50-100 cm)
Possibilities:— silicon or fibre tracker in a
magnet with calorimetry, electron and muon ID (eg. NOMAD-STAR??)
— Liquid argon calorimeter
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7.1 Vertex detector with spectrometer 7.1 Vertex detector with spectrometer R&D in NOMAD for short baseline detector based on silicon:
NOMAD-STAR
Does not need to be very big (eg. R~50-100 cm)
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7.1 Vertex detector with spectrometer 7.1 Vertex detector with spectrometer Longest silicon microstrip
detector ladders ever built: 72cm, 12 detectors, 50 m pitch, S/N=16:1
Vertex resolution 19 m
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7.1 Vertex detector with spectrometer 7.1 Vertex detector with spectrometer
CC event
Primary vertex
Secondary vertex
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7.1 Vertex detector with spectrometer 7.1 Vertex detector with spectrometer Vertex resolution: 19 m Impact parameter resolution: 33 m
Used NOMAD-STAR to search for charm events: marginal statistical accuracy, but was a good proof of principle
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7.1 Vertex detector with spectrometer 7.1 Vertex detector with spectrometer Efficiency very low: 3.5% for D0, D+ and 12.7% for Ds
+ detection because fiducial volume very small (72cmx36cmx15cm), only 5 layers and only one projection.
From 200 million events, about 600,000 charm events, but efficiencies can be improved.
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7.2 Other technologies 7.2 Other technologies Liquid argon TPC in a magnetic field would be able to perform as a near
detector as well
Other possible technologies that have been used or are being proposed to be used as near detectors: scintillating fibre tracker, standard gas TPC with target (T2K near detector) …
2.5 GeV e, 1.5T
Maybe the UA1/NOMAD magnet will live on again as a near detector for a neutrino factory?
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ConclusionsConclusions
The Near Detector(s) needs to meet two physics goals:– Flux control and measurement for the long baseline– A dedicated near detector neutrino physics programme
Silicon detectors could provide a solution for the near detector technology.
Other options include liquid argon TPC, SciFi tracker, or gas TPC associated with a target.