Neutrino Flavor Identification in SalSA

P. Miočinović

University of Hawaii at Manoa, Honolulu, Hawaii, USA

May 19, 2005

ARENA Workshop, DESY Zeuthen

MC setup description

Radio signature in the detector

Means of flavor identification

Preliminary results

Summary

Outline

MC simulation setup

Neutrino generator ANIS

Lepton propagator MMC

Trigger simulator SMC

ν

μ,τ

rock

salt

Trigger seeting:

node: 5/12 antennas in 80 ns

array: 5 nodes in 3.5 μs

RF signal signature

on a scale size of the detector (~250 m antenna node separation) RF emitting region is point-like

no scattering and long attenuation length preserve cone-like RF signal

the width of the cone is correlated with the intrinsic length of the RF emitting region (i.e. single slit diffraction)

due to LPM effect EM showers will be longer than hadronic showers of the same energy
.
→ measuring the strength and the width of the cone	differentiates hadronic and EM showers

109 GeV νμ interaction

Flavor ID Table

109 GeV
νμ CC

109 GeV
νμ CC

Lines show expected

line-of-flight of RF
pulse triggering an
antenna node

Preliminary results

10-15% of νμ events at 109 GeV have secondaries large enough to trigger several antenna nodes

the remainder of the events studied either:
- have large Y-factor (little energy given to lepton)
- secondaries are not seen due to “skin losses”
(i.e. neutrino interacts as it exits the detector volume)

more formal RF cone reconstruction needs to be developed to further quantify the flavor resolution potential of this approach

Summary

Neutrino flavor identification is possible in radio Čerenkov neutrino detectors

Accurate reconstruction of primary hadronic vertex allows for virtually noise free search for secondary RF emitting showers

Comparison with MC models will provide measure of flavor content of incoming ultra-high-energy (>108.5 GeV) neutrino flux

coco

2002-08-19T21:13:14