credo science case - indico.ifj.edu.pl · credo science case d. góra for the credo collaboration...
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CREDO science case D. Góra for the CREDO Collaboration Institute of Nucler Physics PAS, Cracow
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Slide 2
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Slide 3
Topics
1) CRPropa standard / exotic CRE: conditions
2) looking for Sun Cosmic Ray Ensambles
3) clusters in time: any time scale suspected
5) search for correlations: cosmic / GMF / weather / sun activity / seismic effects
4) Integration of data from different experiments: Credo monitor
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Slide 4
Topic 1: Preshower in vinicity of Sun
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Slide 5
Example of CRE : Preshower in vinicity of Sun
Y [km]30� 20� 10� 0 10 20 30
Z [m
]
0.15�
0.1�
0.05�
0
0.05
0.1
0.15
1
210
410
610
810
1010
1210
1410
1610
18101910
E [eV]
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Slide 6
Finding point sources in the sky means to locate an excess of events from a particular direction over the background.
The signals events my present additional features: different energy spectrum or time structure
- the angular uncertainty of event - the angular distance of event from source
# E
vent
s Energy
Signall Backgroundl
Topic3: Basic concept of point-source search filter
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Slide 7
htempEntries 10000Mean 1.542− Std Dev 0.5509
log10(TS=min doublet duration)5− 4− 3− 2− 1− 0
Cou
nts
1
10
210
htempEntries 10000Mean 1.542− Std Dev 0.5509
7
RESULT: p-value as the fraction of events below TSdata
TSdata
TSdata
background events
Test Statistics (TS) Data distribution Scrambled maps
TS := doublet duration*
*for other multiplets different defini tions assumed
TS1
time TS2
TSN
N=10 000
S1
S2 P-value=--------- S1
S1 + S2
Simple method: search for time cluster
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Slide 8 8 TS distribution for no signal events in data sample
General method: an unbinned maximum likelihood
TS distribution for no signal events in data sample
Method (J. Braun et al., Astropart. Phys.33:175,2010) Space probability density function Energy probability density function
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Slide 9
Topic4:
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Slide 10
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Slide 11
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Slide 12
Topic 5:
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Slide 13
Varia:
... and gamma-ray astronomy