1. 7th Georgian-German School and Workshop in Basic Science
Precision Physics
August 29, | Hans Ströher (Forschungszentrum Jülich)

2. GGSWBS´16 – Precision Physics
Introduction
There are many examples in physics
showing that higher precision
revealed new phenomena,
inspired new ideas,
or confirmed or dethroned
well-established theories.
(Wolfgang Paul, Physics Nobel 1989)

3. Increased precison led to a new theory: QED
GGSWBS´16 – Precision Physics
Example: „Lamb-Shift“ in Hydrogen Atom
Energy
Increased precison led to a new theory: QED

4. GGSWBS´16 – Precision Physics
Accuracy, precision, trueness, uncertainty, errors …
A tool can be precise
and not accurate,
accurate but not precise
or both.

5. GGSWBS´16 – Precision Physics
Example: Speed-of-light (c) Measurements
Galileo Galilei
(about 1640)
c (km/s) 
Fixed since 1983
c =: m/s
year of measurement 

6. GGSWBS´16 – Precision Physics
Sensitivity
appropriate
tools required
(Small) value of
physical observable
e.g. length

7. GGSWBS´16 – Precision Physics
Example: Gravitational Waves Discovery
Joseph Weber (1960s)
Joseph Weber (1960s)
LIGO (2016)

8. GGSWBS´16 – Precision Physics
Example: Dark Matter Search
1 zb (zeptobarn) =
10-21 b =
10-21 x m2
LUX (2016): 370 kg
LUX ZEPLIN (> 2020): 7000 kg

9. GGSWBS´16 – Precision Physics
Our aim: Electric Dipole Moments (EDM)
Electric dipole: e0 e0 - +
p = e0 d d
T ( CP) violation
may be the key to
understand the
asymmetry between
matter and anti-
matter that we owe
our existence
A permanent
electric dipole
violates space
and time inver-
sion symmetry

10. GGSWBS´16 – Precision Physics
Our aim: Electric Dipole Moments (EDM)
Big Bang
time
today ?
Matter
- Antimatter
= Universe
10-6 s
only „matter“
4x1017 s

11. GGSWBS´16 – Precision Physics
Our aim: Electric Dipole Moments (EDM) +
<10 µm -
Neutron
1 fm
1022 fm

12. GGSWBS´16 – Precision Physics
Our aim: Electric Dipole Moments (EDM)

13. GGSWBS´16 – Precision Physics
Our aim: Electric Dipole Moments (EDM)

14. გმადლობთ