Refine
Year of publication
Language
- English (436)
Has Fulltext
- yes (436)
Is part of the Bibliography
- no (436)
Keywords
- Heavy Ion Experiments (13)
- Hadron-Hadron scattering (experiments) (11)
- LHC (7)
- Heavy-ion collision (5)
- ALICE experiment (3)
- Hadron-Hadron Scattering (3)
- pp collisions (3)
- ALICE (2)
- Beauty production (2)
- Particle and resonance production (2)
Institute
- Physik (436) (remove)
The measurement of the mass differences 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 difference in the interactions between nucleons and anti-nucleons 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 effective theories3, but cannot yet be directly derived from quantum chromodynamics. Here we report a measurement of the difference between the ratios of the mass and charge of deuterons (d) and anti-deuterons (), and 3He and 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 differences 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).