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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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Page 1: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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…

Page 2: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• protons 108 TeV

photons 102 TeV

neutrinos 104 TeV

Nature’s

accelerators?

Page 3: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

3

cosmic ray

accelerators:

where, how?

gravitational energy

from collapsing star

converted into

particle acceleration

LHC filling the orbit of

Mercury

Page 4: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

supernova

remnants

gamma

ray

bursts

Page 5: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

flux < 1% of astrophysical neutrino flux observed

Nature 484 (2012) 351-353

Page 6: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 7: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

neutrino as a cosmic messenger:

• electrically neutral

• essentially massless

• essentially unabsorbed

• tracks nuclear processes

• … but difficult to detect

Page 8: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 9: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

atmospheric neutrinos

(… and muons!)

not only p, also K, D,…

Page 10: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

IceCube

5160 PMs

in 1 km3

Page 11: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 12: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 13: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 14: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

main

board

LED

flasher

board

HV board

architecture of independent DOMs

10 inch pmt

Page 15: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

… 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…

Page 16: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

muon track: color is time; number of photons is energy

Page 17: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

events detected per year:

• atmospheric* m ~ 1011

• atmospheric** n m ~ 105

• cosmic n m < 102

* 3000 per second ** 1 every 6 minutes

Page 18: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

GZK neutrino search: two neutrinos with > 1,000 TeV

Page 19: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

tracks and showers

PeV ne and nt showers:

• 10 m long

• volume ~ 5 m3

• isotropic after 25~ 50m

Page 20: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 21: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

size = energy color = time = direction

Page 22: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 23: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 24: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 25: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 26: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

27

cosmic neutrinos in 2 years of data at 3.7 sigma

Page 27: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

muon neutrinos through the Earth 5.6 sigma

Page 28: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

30

for 5.5 years of data: 3.7 5.6 sigma and E-2 above 200 TeV !

Page 29: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 30: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

neutrinos of all flavors interacting inside

IceCube

confirmation! flux of muon neutrinos

through the Earth

3 year

> 5s

4 year

7 sigma

Page 31: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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…

Page 32: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

4 year HESE

where do they come from?

Page 33: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

Galactic

correlation with Galactic plane: TS of 2.5% for a width of 7.5 deg

Page 34: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 35: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• 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?

Page 36: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 37: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

hadronic

gamma rays

⌫

γ

p

hadronic gamma rays ?

p+ = p- = p0

Page 38: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

⌫

p

e−

e+

γ

γ

electromagnetic

cascades in CMB

hadronic

gamma rays

Page 39: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

cosmic

neutrinos

Fermi

gammas

E-2.15

p + = p - = p 0

Page 40: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

active galaxy

particle flows near

supermassive

black hole

Page 41: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

blazars

particle flows near

supermassive

black hole

Page 42: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

energy in the Universe in gamma rays, neutrinos and cosmic rays

Page 43: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• 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?

Page 44: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• there is more

Page 45: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

cosmic

neutrinos

Fermi

gammas

E-2.15

p + = p - = p 0

Page 46: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 47: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 48: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

up-going nm

yet lower energies….

Page 49: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

upcoming events:

“extreme” charm model

can fit the northern, not

the southern hemisphere

not forward charm production analogous to pp(K+L)p

Page 50: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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…

Page 51: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

e t

m oscillate over cosmic

distances to 1:1:1

Page 52: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

one half million

atmospheric

neutrinos…

Page 53: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

IceCube

DeepCore

PINGU

Page 54: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

SuperK

~ 1 GeV

IceCube

6 GeV < Ereco < 56 GeV

Page 55: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 56: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

no telltale structure

in the zenith angle

distribution

Page 57: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 58: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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…

Page 59: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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!

Page 60: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• 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

Page 61: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

220m

>100m

most transparent medium

in nature, and in the lab

absorption length of Cherenkov light

Page 62: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 63: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

instrumented volume: x 10 same budget as IceCube

PINGU infill 40 strings

GeV threshold

Page 64: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators
Page 65: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

cm3310E

1~

gn ,

quantized space: matter where the geometry is activated

Page 66: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 67: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

Fermi

GRB 090510

PlanckQG MM

Page 68: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• 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

Page 69: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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!

Page 70: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

• 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

Page 71: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

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

Page 72: Particle Physics Beyond Laboratory Energies · Particle Physics Beyond Laboratory Energies Francis Halzen Wisconsin IceCube Particle Astrophysics Center • Nature’s accelerators

Bayesian Filtering- From Kalman Filters to Particle Filters and Beyond

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