Merci à Eric pour son aide!irfu.cea.fr/.../2877/Emmanuel_ResumeConfEte2012.pdfEmmanuel Moulin CTA...

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Emmanuel Moulin CTA meeting, Zürich 2009 Merci à Eric pour son aide! Emmanuel Moulin Séminaire SPP, 1 er octobre 2012 1

Transcript of Merci à Eric pour son aide!irfu.cea.fr/.../2877/Emmanuel_ResumeConfEte2012.pdfEmmanuel Moulin CTA...

Page 1: Merci à Eric pour son aide!irfu.cea.fr/.../2877/Emmanuel_ResumeConfEte2012.pdfEmmanuel Moulin CTA meeting, Zürich 2009Emmanuel Moulin 27 IDM 2012 Carsten Rott Latest IceCube Results

Emmanuel Moulin CTA meeting, Zürich 2009

Merci à Eric pour son aide!

Emmanuel Moulin Séminaire SPP, 1er octobre 2012

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Emmanuel Moulin CTA meeting, Zürich 2009

Emmanuel Moulin 3 Résumé des conférences d’été

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Spin-independent

Livetime: 225 days Fudicial mass: 34 kg

Résumé des conférences d’été

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o  Computation of the limit assuming that Leff is 0 below 3 keVnr (red line in the figure) o  The impact on the limit is below 5% for all the relevant mass range

Résumé des conférences d’été

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Emmanuel Moulin CTA meeting, Zürich 2009

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o  Analysis optimized for low-energy events -  Lower gamma rejection -  Decrease of the exposure

o  Submitted to Phys. Rev. D 2012 o  Competitive resutls wrt to CDMS-II low-mass results

Résumé des conférences d’été

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o  40 FID detectors of 800 g (mfid = 600 g) o  Upgrade of internal cryostat and shielding o  Reduction of gamma bck o  24 kg fudicial No bck expected in 3000 kgdayfid Detector technology ready for 1T scale cryogenic array

Résumé des conférences d’été

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New data: sneak preview (very preliminary)!!!

Clear need for C-4 x10 mass, reduced threshold and backgrounds, if we are ever to stop chasing our tails.!

•   Checking that all parameters employed in cuts have remained stable following the 3 mo. thermal cycle post-fire (we want to continue with no changes to those -cuts have been frozen from the beginning, a de facto blind analysis-)!•   Low-energy excess still there. !•   Rates look flatter on second year. Optimist: to be expected, the modulation was too large. Pessimist: to be expected, the modulation was a fluke. !•   Cosmogenics nicely getting out of the way: the region 0.5-0.7 keV may have decayed an additional ~15% beyond what expected from these. Needs just a few more months to distinguish between a very long-lived decay there (T1/2~6 years (!?)) or initial short decay from unrejected surface events. All this can affect modulation phase a tad.!•   How to treat all this new info: we are performing a sophisticated 2D (energy-time) analysis in collaboration with Matt Bellis and Chris Kelso, able to test several halo model features. !

New data: sneak preview (very preliminary)!!!

Clear need for C-4 x10 mass, reduced threshold and backgrounds, if we are ever to stop chasing our tails.!

•   Checking that all parameters employed in cuts have remained stable following the 3 mo. thermal cycle post-fire (we want to continue with no changes to those -cuts have been frozen from the beginning, a de facto blind analysis-)!•   Low-energy excess still there. !•   Rates look flatter on second year. Optimist: to be expected, the modulation was too large. Pessimist: to be expected, the modulation was a fluke. !•   Cosmogenics nicely getting out of the way: the region 0.5-0.7 keV may have decayed an additional ~15% beyond what expected from these. Needs just a few more months to distinguish between a very long-lived decay there (T1/2~6 years (!?)) or initial short decay from unrejected surface events. All this can affect modulation phase a tad.!•   How to treat all this new info: we are performing a sophisticated 2D (energy-time) analysis in collaboration with Matt Bellis and Chris Kelso, able to test several halo model features. !

Recap

New data

Paper coming soon… Résumé des conférences d’été

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Discrimination power

Simultaneous measurements of - eneygy deposited in the crytal - scintallation light

Résumé des conférences d’été

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Aim for 1-ton experiment

- Item in the ASPERA roadmap - Coordinated cooperation with Super-CDMS (1st joint meeting: 7th Oct 2011) - Conceptional Design Report 2012

Résumé des conférences d’été

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  Most DM-dominated objects in the Universe   Expected to be free from standard astrophysical bck

o  10 dwarfs o  NFW profiles only o  Ultra-faint dwarfs contribute most Caveat: uncertainties remain on the DM halo modelling

Canonical WIMP annihilation cross section

Résumé des conférences d’été

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10 yr, 10 dSph sensitivity to thermal WIMPs up to 100 GeV

Résumé des conférences d’été

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annihilation cross-section ⟨σv⟩χχ →γγ ~ 1.3 x 10−27 cm3s-1

Résumé des conférences d’été

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Fermi will collect at least twice the amount of data! Résumé des conférences d’été

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o  Non-detection places limits on annihilation cross section to γγ and Zγ o  No statement from the Fermi coll. about the 130 GeV line

Résumé des conférences d’été

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o  Non-detection places limits on annihilation cross section to γγ and Zγ o  These limits are not in strong tension with signal claims

Résumé des conférences d’été

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o  Many studies find similar line-like features o  Su & Finkbeiner 2012 localize the feature to a region offset from the GC o  Could a break in the spectrum of the Fermi bubbles be mistaken for a line? (Profumo & Linden 2012) o  Non-DM astrophysical sources of lines? (Aharonian et al 2012) o  Many unresolved questions remain: stay tuned! - Instrumental systematics, quality selection, … ? - Any sign for continuum part of signal?! - Statistical fluctuation: quite significant, but maybe the most likely explanation? More data and analyses are needed Résumé des conférences d’été

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Résumé des conférences d’été

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50 hour observation time

Résumé des conférences d’été

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o  With DeepCore, analysis reaches neutrino energies as low as 10-20GeV → New very competitive SD-cross-section limits

Spin-independent limit Spin-dependent limit

Résumé des conférences d’été

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IDM 2012

Carsten Rott Latest IceCube Results

WIMP mass (GeV)210 310 410 510

)-1

s3>

(cm

! A"<

-2610

-2510

-2410

-2310

-2210

-2110

-2010

IC 59 dwarf stackingIC 59 Virgo clusterIC 22 Galactic HaloIC 40 Galactic Center

H.E.S.S. FornaxMAGIC Segue1

Fermi dwarfs

##$%%

Fermi DataPamela Data

Natural scale

Unitarity bound

Comparison of Bounds

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Phys.Rev.D84:022004,2011

IceCube can test dark matter models motivated by PAMELA and Fermi electron data (e.g. Meade et al. 2008)

Results extremely competitive for high-mass WIMPs (see also Talk by B. Dasgupta Monday)

IceCube Preliminary

Résumé des conférences d’été

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o  Most significant cluster at (α,δ)= (−46.5°, −65.0°) → 9 (5) events within a cone of 3 (1) degrees → significance 2.2σ Compatible with the background hypothesis o  By 2016: limits expected to be improved by a fator 2.5 o  Submitted to Astrophys. J. 2012

Résumé des conférences d’été

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Emmanuel Moulin CTA meeting, Zürich 2009

•  Generally neutrinos identified as “through the Earth” up-going events

•  Earth is opaque for UHE neutrinos •  UHE neutrino-induced events are

coming from above and near horizontal direction

Possibility of the origin includes •  GZK ν •  on-site ν production from the cosmic-ray accelerators •  atmospheric prompt ν •  atmospheric conventional ν

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o  More cascade-event sensitive analysis needed

o  Statistical confirmation foreseen with an independent sample

o  2010 (79 strings) and 2011 (86 strings) data: livetime 673 days o  The highest energy neutrino events observed ever

Résumé des conférences d’été