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Particle Physics
Beyond Laboratory Energies Francis Halzen
Wisconsin IceCube Particle Astrophysics Center
• Nature’s accelerators have delivered the
highest energy protons, photons and neutrinos
• closing in on the cosmic ray accelerators?
• New tests of three-flavor neutrino framework
• Probing new physics: sterile neutrinos, Lorentz
invariance, quantum structure of space-time…
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• protons 108 TeV
photons 102 TeV
neutrinos 104 TeV
Nature’s
accelerators?
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3
cosmic ray
accelerators:
where, how?
gravitational energy
from collapsing star
converted into
particle acceleration
LHC filling the orbit of
Mercury
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supernova
remnants
gamma
ray
bursts
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flux < 1% of astrophysical neutrino flux observed
Nature 484 (2012) 351-353
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radiation and dust
black hole
neutron star
p + p0
~ cosmic ray + gamma
NEUTRINO BEAMS: HEAVEN & EARTH Neutrino Beams: Heaven & Earth
p + g n + p+
~ cosmic ray + neutrino
n and g beams : heaven and earth accelerator is powered by large gravitational energy
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neutrino as a cosmic messenger:
• electrically neutral
• essentially massless
• essentially unabsorbed
• tracks nuclear processes
• … but difficult to detect
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above 100 TeV
• cosmic
neutrinos:
• atmospheric
background
disappears
atmospheric neutrino cosmic
100 TeV
dN/dE ~ E-2
10—100 events
per year for fully
efficient 1 km3
detector
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atmospheric neutrinos
(… and muons!)
not only p, also K, D,…
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IceCube
5160 PMs
in 1 km3
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main
board
LED
flasher
board
HV board
architecture of independent DOMs
10 inch pmt
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… each Digital Optical Module independently collects light signals like this, digitizes them,
…time stamps them with 2 nanoseconds precision, and sends them to a computer that sorts them events…
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muon track: color is time; number of photons is energy
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events detected per year:
• atmospheric* m ~ 1011
• atmospheric** n m ~ 105
• cosmic n m < 102
* 3000 per second ** 1 every 6 minutes
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GZK neutrino search: two neutrinos with > 1,000 TeV
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tracks and showers
PeV ne and nt showers:
• 10 m long
• volume ~ 5 m3
• isotropic after 25~ 50m
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size = energy color = time = direction
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select events interacting
inside the detector only
no light in the veto region
veto for atmospheric
muons and neutrinos
(which are typically accom-
panied by muons)
energy measurement: to-
tal absorption calorimetry
High Energy Starting Events
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above 100 TeV
• cosmic
neutrinos:
• atmospheric
background
disappears
atmospheric neutrino cosmic
100 TeV
dN/dE ~ E-2
10—100 events
per year for fully
efficient 1 km3
detector
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muon
• lattice of photomultipliers
• shielded and optically
transparent medium
• muon travels from 50 m
to 50 km through the
water at the speed of light
emitting blue light along
its track
neutrino
interaction
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27
cosmic neutrinos in 2 years of data at 3.7 sigma
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muon neutrinos through the Earth 5.6 sigma
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30
for 5.5 years of data: 3.7 5.6 sigma and E-2 above 200 TeV !
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neutrinos of all flavors interacting inside
IceCube
confirmation! flux of muon neutrinos
through the Earth
3 year
> 5s
4 year
7 sigma
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Particle Physics
Beyond Laboratory Energies Francis Halzen
Wisconsin IceCube Particle Astrophysics Center
• Nature’s accelerators have delivered the
highest energy protons, photons and neutrinos
• closing in on the cosmic ray accelerators?
• New tests of three-flavor neutrino framework
• Probing new physics: sterile neutrinos, Lorentz
invariance, quantum structure of space-time…
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4 year HESE
where do they come from?
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Galactic
correlation with Galactic plane: TS of 2.5% for a width of 7.5 deg
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• we observe a diffuse flux of neutrinos from
extragalactic sources
• a subdominant Galactic component cannot be
excluded
• where are the PeV gamma rays that accompany
PeV neutrinos?
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radiation and dust
black hole
neutron star
p + p0
~ cosmic ray + gamma
NEUTRINO BEAMS: HEAVEN & EARTH Neutrino Beams: Heaven & Earth
p + g n + p+
~ cosmic ray + neutrino
n and g beams : heaven and earth accelerator is powered by large gravitational energy
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hadronic
gamma rays
⌫
γ
p
hadronic gamma rays ?
p+ = p- = p0
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⌫
p
e−
e+
γ
γ
electromagnetic
cascades in CMB
hadronic
gamma rays
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cosmic
neutrinos
Fermi
gammas
E-2.15
p + = p - = p 0
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active galaxy
particle flows near
supermassive
black hole
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blazars
particle flows near
supermassive
black hole
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energy in the Universe in gamma rays, neutrinos and cosmic rays
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• we observe a flux of cosmic neutrinos from the
cosmos whose properties correspond in all
respects to the flux anticipated from PeV-energy
cosmic accelerators that radiate comparable
energies in light and neutrinos
• the energy in cosmic neutrinos is also comparable
to the energy observed in extragalactic cosmic rays
(the Waxman-Bahcall bound)
• at some level common Fermi-IceCube sources?
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• there is more
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cosmic
neutrinos
Fermi
gammas
E-2.15
p + = p - = p 0
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towards lower energies: a second component?
atmospheric C.R. muons cosmic n
PeV neutrinos
absorbed in the Earth
warning: • spectrum may not be a power law • slope depends on energy range fitted
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up-going nm
yet lower energies….
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upcoming events:
“extreme” charm model
can fit the northern, not
the southern hemisphere
not forward charm production analogous to pp(K+L)p
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Particle Physics
Beyond Laboratory Energies Francis Halzen
Wisconsin IceCube Particle Astrophysics Center
• Nature’s accelerators have delivered the
highest energy protons, photons and neutrinos
• closing in on the cosmic ray accelerators?
• New tests of three-flavor neutrino framework
• Probing new physics: sterile neutrinos, Lorentz
invariance, quantum structure of space-time…
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e t
m oscillate over cosmic
distances to 1:1:1
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one half million
atmospheric
neutrinos…
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IceCube
DeepCore
PINGU
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SuperK
~ 1 GeV
IceCube
6 GeV < Ereco < 56 GeV
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eV sterile neutrino Earth MSW resonance for 3 TeV neutrinos
electron neutrino oscillates into sterile
modifies matter effect of the atmospheric neutrino beam
observed through the Earth
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no telltale structure
in the zenith angle
distribution
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Particle Physics
Beyond Laboratory Energies Francis Halzen
Wisconsin IceCube Particle Astrophysics Center
• Nature’s accelerators have delivered the
highest energy protons, photons and neutrinos
• closing in on the cosmic ray accelerators?
• New tests of three-flavor neutrino framework
• Probing new physics: sterile neutrinos, Lorentz
invariance, quantum structure of space-time…
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conclusions
progress through instrumentation
• larger (TA) and improved (Auger) air
shower arrays
• CTA giant ground based photon array
• more (KM3NeT, GVD, ORCA) and next
generation (IceCube-Gen2, PINGU)
neutrino detectors
• gravitational waves!
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• a next-generation IceCube with a volume of 10 km3
and an angular resolution of < 0.3 degrees will see
multiple neutrinos and identify the sources, even
from a “diffuse” extragalactic flux in several years
• need 1,000 events versus 100 now in a few years
• discovery instrument astronomical telescope
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220m
>100m
most transparent medium
in nature, and in the lab
absorption length of Cherenkov light
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DeepCore IceCube NGIceCube (1/2/3)
Spacing 1 (120m):
IceCube (1 km3)
+ 98 strings (1,3 km3)
= 2,3 km3
Spacing 2 (240m):
IceCube (1 km3)
+ 99 strings (5,3 km3)
= 6,3 km3
Spacing 3 (360m):
IceCube (1 km3)
+ 95 strings (11,6 km3)
= 12,6 km3
(increase in threshold not important: only eliminates energies
where the atmospheric background dominates)
measured optical properties twice the string spacing
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instrumented volume: x 10 same budget as IceCube
PINGU infill 40 strings
GeV threshold
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cm3310E
1~
gn ,
quantized space: matter where the geometry is activated
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Lorentz violation from Planck scale
• speed of photons and neutrinos depends on their
energy, like photons in a crystal
• Planck scale vacuum fluctuations probed by high
energy particles
• modification to dispersion relation leads to an energy
dependent speed of light: Lorentz invariance violation
...)(2222 n
QGM
EEmpE
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Fermi
GRB 090510
PlanckQG MM
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• the existence of PeV neutrino events yields
dramatic limits on any possible Lorentz
invariance violation: superluminal particles
lose their energy to Cherenkov radiation, even
in vacuum
• sensitivity d increases dramatically with
distance d and observed energy E
eenn
3
5
3
1
2
22v
Edac
cnd
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conclusions
progress through instrumentation
• larger (TA) and improved (Auger) air
shower arrays
• CTA giant ground based photon array
• more (KM3NeT, GVD, ORCA) and next
generation (IceCube-Gen2, PINGU)
neutrino detectors
• gravitational waves!
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• energy
1,041 TeV
1,141 TeV
(15% resolution)
• not atmospheric:
probability of
no accompanying
muon is 10-3 per
event
flux at present
level of diffuse
limit
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test of:
equivalence
principle, quantum
gravity and Lorentz
invariance
spacetime is smooth
at energies near and
slightly above the
Planck mass.
“general relativity
will not last tao
hundred years”
M. Turner
limits on d (relative velocity between flavors only)
hep-ph/0502223
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