Update on Point source analysis with 2007-10 data Astronomy Working Group 1 July 2011

Update on Point source analysis with Update on Point source analysis with 2007-10 data2007-10 data

Astronomy Working GroupAstronomy Working Group1 July 20111 July 2011

J. P. Gómez-GonzálezJ. P. Gómez-González

Update on SPS analysis Update on SPS analysis J.P. Gómez-González AWG meeting, 1 July 2011

• ReviewReview

• News, webpage, note, …News, webpage, note, …

• ClusteringClustering• all sky search resultsall sky search results• discovey flux, systematicsdiscovey flux, systematics

• Conclusions/OutlookConclusions/Outlook

2

Outline

Presentation at Moscow meeting:

Details about productions (seatray, rbr mc)

Firs data-mc comparison plots shown

Detector performance plots

Sensitivity for several Lambda cuts (fixed source search)

Dicovery power using number of hits as an energy estimator

Review

Update on SPS analysis Update on SPS analysis J.P. Gómez-González AWG meeting, 1 July 2011 3

J. Brunner designated as analysis referee

4

Data & mc productions

Period 2007 2008 2009 2010 Total

Livetime 183.04 181.04 182.60 220.97 767.65

# Runs 1399 1990 1403 2204 6996

First run 25669 31051 38233 45540 25699

Last run 30460 38230 45536 54250 54250

Livetime from .eff files: /afs/in2p3.fr/home/throng/antares/Eff/Line[N]/[yyyy]/[mm]/r[run].eff


Reconstruction: Aafit v0r7 linked (all hits used)

Calibration versions: from ‘RUN_OFFLINE_CALIBRATION’ DB table

Run-by-run mc production scheme (2ns, 5e8 NgenE, Mupage, …)

5

Calibration versions

Script to read calibration constantsfrom i3 files (thanks to T. Eberl)

run: 027659CalibrationType OfflineLabel 2007:L5:V6.1LabelAvc0Pe insitu 0pe line 1-5LabelAvc1Pe In situ 1pe may 2007 (08/07/2009 21:44:27)LabelAvcEffThrsLabelT0 5 lines + interline offsets(30/09/2010 12:54:48)LabelTvc InSituTVC 04/06/2008LabelXt in-situ line 1-5TimeOfProcess 2011-5-27/12:0:0UserComment same calibration as 2007:L5:V5.1 + new 1pe +new thrsVersionID 59186729VersionIDAvc0Pe 5394610VersionIDAvc1Pe 32572536VersionIDAvcEffThrs 36083413VersionIDT0 54497692VersionIDTvc 16684668VersionIDXt 5394631


Being completed: still running in Lyon (requires read HPSS files)

6

Analysis web page

http://ific.uv.es/~jpablo/web/analysis/home.html

Analysis description, plots, questions …(Internal note also on preparation)


7

DATA/MC comparison plots

New SeaTray data production ready (since yesterday):

A total of 7553 runs from 2007- 2010 processed

ANN energy reconstruction algorithm applied

Convertion to nTuples used for this analysis to be produced soon


8

Detector performance

New implementation: reading of data quality parameters from DATA_QUALITY table for a given run (baseline rate, qbasic and alignment flags, active oms, triggers, …)


9

Clustering analysis

EM algorithm: finds the set of parameters (n,dec,ra) that maximize the likelihood in an analytical way

Background pdf: parameterization from data (polynomial function)

Angular error distribution: in order to simulate signal events according to

detector PSF

The number of hits used in the track fit tested as an energy estimator for a better signal/background discrimination

Implemented in the algorithm that performs the all sky search (new)


10

Skymap

Skymap in equatorial coordinates with the (scrambled in ra) positions of the ~5400 events in the data sample requiring up-going tracks with >-5.4 and < 1º

In the all sky search a pre-clustering algorithm selects a set of candidate clusters before likelihood maximization


11

Pre-Clustering

The parameters that determine the number of clusters pre-selected are; the cone size (CS), and the number of required events inside this cone (NE)

In this plot it was considered CS=2 degrees and NE = 4 events


Number of selected clusters as a function of the cut

Of course this also increase the computational time and disk

space requirements:Near the 5% of the current disk

space available per user in Lyon is needed to produce the

limits/discovery plots for > -5.4

12

Clustering analysis

Distribution of the test statistic (AS search) for the only background case

More bg like – More signal like

10k pseudo-experiments simulated for each case using a set of skymaps

scrambled in ra

Simulations where 5 times more pseudo-experiments are

generated ongoing (to avoid low statistic problems)


All sky search

13

Median upper limits

Median upper limits set on the E^-2 neutrino flux at 90%CL following Neyman prescription

Sensitivity curves for the fixed source search and the

all sky search


Up-going tracks with >-5.0 and < 1º

Implementation of the Feldman-Cousins method ongoing

All sky search

14

Dicovery flux

3 discovery flux (50% CL) for different cuts

Fixed source seach


Final data sample to be selected considering the quality cuts that give the optimal 5 discovery flux

15

Discovery power

Not so efficient in the all sky search; only a 5% gain factor while in the fixed source discovery a 30% factor is found

Goal: to test ANN energy reconstruction as soon as possible

• Using number of hits to a better signal/bg discrimination

All sky search


16

Discovery power

No significant effect on sensitivity (FS search)

To be tested with different values

Systematic uncertainties: 15% angular resolution, 15% detector acceptance, absolute pointing uncertainty (previous analysis)

Up-going tracks with >-5.0 and < 1º

study on systematic uncertainties foreseen

Fixed source seach


• New SeaTray production readyNew SeaTray production ready• nTuples and data/mc comparison plots to be nTuples and data/mc comparison plots to be

produced (soon)produced (soon)

• Analysis web page and Internal note in preparationAnalysis web page and Internal note in preparation

• First all sky search resultsFirst all sky search results• Goal: cuts optimization on the maximum 5Goal: cuts optimization on the maximum 5

discovery flux basisdiscovery flux basis

• Use the reconstructed energy (dedicated algorithms)Use the reconstructed energy (dedicated algorithms)

• Study on systematic uncertaintiesStudy on systematic uncertainties17

Conclusions/Outlook


Documents

Update on Point source analysis with 2007-10 data Astronomy Working Group 1 July 2011