Precision measurement of the mass difference between light nuclei and anti-nuclei
ALICE Collaboration. (2015). Precision measurement of the mass difference between light nuclei and anti-nuclei. Nature Physics, 11(10), 811-814. https://doi.org/10.1038/nphys3432
Julkaistu sarjassa
Nature PhysicsTekijät
Päivämäärä
2015Tekijänoikeudet
© 2015 Macmillan Publishers Limited. This is an open access article licensed under a Creative Commons Attribution 4.0 International License.
The measurement of the mass di erences for systems bound
by the strong force has reached a very high precision with
protons and anti-protons1,2
. The extension of such measurement
from (anti-)baryons to (anti-)nuclei allows one to probe
any di erence in the interactions between nucleons and antinucleons
encoded in the (anti-)nuclei masses. This force is a
remnant of the underlying strong interaction among quarks and
gluons and can be described by e ective theories3
, but cannot
yet be directly derived from quantum chromodynamics. Here
we report a measurement of the di erence between the ratios
of the mass and charge of deuterons (d) and anti-deuterons (d), ¯
and 3He and 3He nuclei carried out with the ALICE (A Large
Ion Collider Experiment)4 detector in Pb–Pb collisions at a
centre-of-mass energy per nucleon pair of 2.76 TeV. Our direct
measurement of the mass-over-charge di erences confirms
CPT invariance to an unprecedented precision in the sector
of light nuclei5,6
. This fundamental symmetry of nature, which
exchanges particles with anti-particles, implies that all physics
laws are the same under the simultaneous reversal of charge(s)
(charge conjugation C), reflection of spatial coordinates (parity
transformation P) and time inversion (T).
...
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Nature Publishing GroupISSN Hae Julkaisufoorumista
1745-2473Asiasanat
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