Transcript Estimate of the ANTARES sensitivity for showering

ANTARES sensitivity for Diffuse
Fluxes and for 1000 d livetime
I. Single flavor (nm)
II. All flavors (showering events)
M. Spurio
19/06/2013
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Sensitivity definition
 90% 
m90
ns
  test
m90
• All analyses optimized the sensitivity using the MRF
methods from Hill-Rawlins.
•m90 (nb) depends on the
number of background
events. See plot.
• ns represent the number
of signal events. Is the sum
of all events in the final step
from all neutrino and
antineutrino channels
•The test flux test
represents the sum of the
input flux for each n and n
channel
nb
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I- nm Analyses
1) Paper PLB 696 (2011) 16–22
2) Jutta Analysis
• Estimate of the sensitivity (nm) assuming a
reference livetime of 1000 d
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1) Sensitivity from the PLB paper
It includes the possible contribution from prompt
nb
m90
ns
MRF= test
90%(nm)
m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
Original
(334d)
12.7
7.4
10.8
0.68
(1/2)x2x10-7
0.68x10-7
1000 d
38.1
12
32.4
0.37
10-7
0.37x10-7
1000 d
32.1
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32.4
0.34
10-7
0.34x10-7
(no prompt)
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2) Sensitivity from the Jutta
It does not include the contribution from prompt
m90
nb
ns
MRF= test
90%(nm)
m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
Original
(838 d)
6.68
5.7
3.22
1.77
2x10-8
0.36x10-7
1000 d
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6.2
3.8
1.63
2x10-8
0.33x10-7
(no prompt)
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II- Shower analyses (all flavors)
• 4 different documents analyzed
–
–
–
–
Giada Carminati PhD thesis
Qader PhD thesis
Lucia Ambrogi Master Thesis
Thomas Folger, in progress (as at the Marseille meeting)
• Estimate of the sensitivity (ne+nm+nt) assuming a
reference livetime of 1000 d
• Common problem: simulation of the nt int. missing
• Two scenarios for the nt contribution
– Pessimistic = 0 events
– Optimistic = 70% of the ne (for ne, no Glashow resonance)
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1. Giada Carminati thesis
• Discovered a lot of bugs in the MC
• Some numbers from wrong MC (Glashow
events for upgoing events, NC bugs, etc…)
corrected “by hand”
• The analysis was supposed to be valid for 4p
sr (no dedicated cuts to remove down going
events)
• Sensitivity computed for 365 days
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Sensitivity from Giada
nb
m90
nsh
nt
n s=
MRF= test
90%(all flavors)
nsh+nt m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
Original
(365d)
0.27
2.67
4.4
0
4.4
0.61
10-7
0.61x10-7
(single fl.)
Pessimis
0.74
3.2
12.0
0
12.0
0.26
6x10-7
1.6x10-7
Optimis
0.74
3.2
12.0
4.8*
16.8
0.19
6x10-7
1.2x10-7
* Removed the events in the Glashow resonance
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2. Qader PhD (unblinded)
•
•
•
•
656 d livetime up to 2011
Upward going events only (<2p sr)
Unblinded: no survived events (signal =0)
Upper limit can be set (better that sensitivity)
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Sensitivity from Qader (KNN)
nb
m90
nsh
nt
n s=
MRF= test
90%(all flavors)
nsh+nt m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
Original
(656d)
1.5
3.4
3.42
0
3.5
1
4x10-7
4x10-7
(ne+nm)
Pessimis
2.3
4.0
5.2
0
5.2
0.77
6x10-7
4.6x10-7
Optimis
2.3
4.0
5.2
3.6
8.8
0.45
6x10-7
2.7x10-7
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3. Lucia Ambrogi Master
• Based on the reconstruction of Qader
• Different cuts to include also the downward
going events (however mostly rejected at level
of MVA)
• Sensitivity computed for 1000 days
• Slightly better than Qader
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Sensitivity from Lucia
nb
Original
(1000 d)
1.63
m90
nsh
nt
n s=
MRF= test
90%(all flavors)
nsh+nt m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
3.5
5.18
0
5.2
0.67
4x10-7
2.7x10-7
(ne+nm)
Pessimis
1.63
3.5
5.18
0
5.2
0.67
6x10-7
4.0x10-7
Optimis
1.63
3.5
5.18
3.5
8.7
0.40
6x10-7
2.4x10-7
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Florian Folger (Dusj in progress)
• See presentation at the last coll. meeting
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Sensitivity from Florian
nb
m90
nsh
nt
n s=
MRF= test
90%(all flavors)
nsh+nt m90/ns GeVcm-2s-1sr-1 GeVcm-2s-1sr-1
Original
(88 days)
3.68
4.5
0.92+
0.07
0
0.99
4.5
4x4.5x10-8
8x10-7
(ne+nm)
Pessimis
42
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11.3
0
11.3
1.15
6x4.5x10-8
3.1x10-7
Optimis
42
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11.3
7.2*
18.5
0.70
6x4.5x10-8
1.9x10-7
* I cannot evaluate the contribution of Glashow resonance, if any
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Summary for all flavor
Analysis
Pessimistic
Optimistic
Note
E290%(all flavors) GeVcm-2s-1sr-1
Giada
1.6x10-7
1.2x10-7
4p. Some extrapolations. Glashow
resonance contribute 40% to the signal.
Florian
3.1x10-7
1.9x10-7
Lucia
4.0x10-7
2.4x10-7
Qader
4.6x10-7
2.7x10-7
A reasonable value to be quoted seems to be
E290%(all flavors) = 3x10-7 GeVcm-2s-1sr-1
This corresponds to a single flavor: 1/3xE290%(all flavors) = 10-7 GeVcm-2s-1sr-1
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Summary for all flavor
Analysis
Pessimistic
Optimistic
Note
E290%(all flavors) GeVcm-2s-1sr-1
1.6x10-7
Giada
1.2x10-7
4p. Some extrapolations. Glashow
resonance contribute 40% to the signal.
Florian
3.1x10-7
1.9x10-7
Lucia
4.0x10-7
2.4x10-7
Qader
4.6x10-7
2.7x10-7
and single flavor from nm
Analysis
Sensitivity
Note
E290%(nm)
GeVcm-2s-1sr-1
PRL paper+Biagi
0.37x10-7
Jutta
0.33x10-7
Prompt contribution included
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