The Fermi Lines....and LHC dark matter. Daniel Whiteson UC Irvine

Transcription

1 The Fermi Lines...and LHC dark matter Daniel Whiteson UC Irvine

2 Map The Line: Instrumental studies You are here Topics of recent work The Line: Fermi vs LHC W signals: Fermi vs LHC Relevance to talk title New LHC DM searches

3 Instrumental Line Studies

4 photons Could the peak photons be spurious? Are they different in some way?

5 First idea isolate signal photons Use energy cut But S/B is not large. Few signal photons. Can we do better?

6 splots discriminating variable unfolding variable (pdfs factorize) background signal data

7 Whiteson splots

8 Whiteson Results

9 Whiteson variables

10 Whiteson External issues?

11 Whiteson Reconstruction

12 Solar signals

13 Solar region Find galactic coord of solar photons

14 Solar region Whiteson excluding GC Find galactic coord of solar photons

15 Solar region Whiteson excluding GC Find galactic coord of solar photons

16 The bigger picture

17 Eric Charles Symposium

18 Simple explanation? Is there a simple energydependent efficiency?

19 Simple explanation? Is there a simple energydependent efficiency? Fails to explain - localization of peak near GC, Limb - theta-dependence of Limb peak - lack of feature in remainder of Sky

20 Common features? Whiteson GC Limb Sun GC Limb Sun

21 GC Sun Sky-GC-Sun theta Whiteson GC Sun Limb Sky-GC-Sun All Theta [30,45]

22 GC Sun Sky-GC-Sun theta Whiteson GC Sun Limb Sky-GC-Sun All Theta [30,45]

23 GC Sun Sky-GC-Sun theta Whiteson GC Sun Limb Sky-GC-Sun All Theta [30,45]

24 Discussion Not a simple energy-dependent efficiency - Not seen in full sky Not a energy-and-theta-dependent efficiency - GC peak not isolated to theta [30,45] - Not seen in full sky with theta restriction (but a hint?) More complex efficiency dependence? - Sun/Limb/GC sweep out different paths across detector

25 High-statistics datasets NEW!...and preliminary

26 Transients Transients Counts Photon classes: transients source clean ultraclean NEW!...and preliminary Photon Energy [GeV]

27 No clues... NEW!...and preliminary

28 Fermi-LHC connection: γ

29 mono-photon Also: Weiner & Yavin: ,

30 Theories k 1 and k 2 control relative couplings to EW bosons

31 Limits

32 Fermi-LHC connection: W

33 Mono-heavy jet (PRL) fat jet sub-jet Missing Momentum W/Z sub-jet 33Ning Zhou, UCI

34 34

35 Limits (PRL) 35

36 XX->WW "Indirect" is an excluded region which is a combination of exclusions from the LAT line search, the LAT dwarf bounds and (at higher m_chi) the VERITAS Segue bounds. It is assumed that this DM makes up 100% of cosmological DM, no matter what its annihilation cross section is. 36

37 New LHC DM searches

38 Where is the new physics!?

39 Traditional approach Specific Model Search strategy General Use theory guidance Optimize analysis to squeeze out maximal sensitivity to new physics. param 2 (param 3-N fixed at arbitrary choices) 39 param 1

40 Model independent search Specific Model Search strategy General Ignore theories completely compare data to standard model 40 Never listen to theorists. Just go look for it. --A. Pierce, 2010

41 Compromise Specific Model Search strategy General Admit the need for a model New signal requires a coherent physical explanation, even trivial or effective Generalize your model Build models using experimental guidance. Ask not: what would we like to discover? But instead: what are we able to discover? 41

42 Compromise Specific Model Search strategy General Admit the need for a model New signal requires a coherent physical explanation, even trivial or effective Generalize your model Build models using experimental guidance. Ask not: what would we like to discover? But instead: what are we able to discover? Resonances: lets make sure we don t miss anything easy to find. 42

43 Is this being done? W Z W 43

44 Is this being done? W /H Z m ll = m Z W/Z m jj = m W/Z 44

45 What about this? Z m ll!= m Z m jj!= m W 45

46 Missed resonances? Easy-to-find resonances may exist in our data and nobody has looked! 46

47 Missed resonances? Easy-to-find resonances may exist in our data and nobody has looked! 47

48 Topological models UCI Physics 247 Final project arxiv:

49 Topological models For a given final state (eg lljj) construct all models with resonances. Then look for them! 49

50 Connections to EFT, Simp. Models Mass scale Full Theories Effective Operators Simplified models 50 Completeness

51 Connections to EFT, Simp. Models Mass scale Full Theories Effective Operators Simplified models Topo models 51 Completeness

52 Mono-Z m jj = m W or m Z m ll = m Z 52

53 Mono-Z m jj = m W or m Z m ll = m Z What about other values? 53

54 Mono-... Signature Heavy resonance + MET X 2 Z Z X 1 With Tongyan Lin X 1 54

55 Map The Line: Instrumental studies Topics of recent work The Line: Fermi vs LHC W signals: Fermi vs LHC Relevance to talk title You are here New LHC DM searches

56 Backup

57 XX->WW

58 Limits

59 Ring around the Sun GeV

60 Sensitivity Whiteson Discriminating var Unfolding var Background: flat Signal: delta func at 0.5

61 Sensitivity Whiteson Discriminating var Unfolding var Background: flat Signal: delta func at 0.5

62 Angles

63 Simulation: GC E>50 E>100

64 Simulation: GC E>50 E>100

65 Where are they from? Finkbiener&Su

66 The photons Following results use a 3-degree circle. Results are ~ the same for larger regions Rao & DW

67 Rao & DW Locations

68 Rao & DW Zoom: 1 sigma

69 Questions

70 Questions

71 Hypothesis tests (l,b) fit far from GC q negative (l,b) fit is close to 0,0 q zero

72 Questions

73 Hypothesis tests (l,b) fit far from GC q negative (l,b) fit is close to 0,0 q zero

74 Hypothesis tests separate fits are better q larger joint fit is better q smaller

75 Locations Conclusion: The photon locations are easily consistent with a single DM halo at the GC

76 mono-w, etc (PRL) Fat jet p T >250 two subjets giving m jet =[50,120] No e,mu,gamma <= 1 additional narrow jets MET >350 or