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Precision measurement of the mass difference between light nuclei and anti-nuclei

Adam, J.
•
Adamová, D.
•
Aggarwal, M. M.
altro
Zyzak, M.
2015
  • journal article

Periodico
NATURE PHYSICS
Abstract
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 measure- ment from (anti-)baryons to (anti-)nuclei allows one to probe any di erence 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 e ective theories3, but cannot yet be directly derived from quantum chromodynamics. Here we report a measurement of the di erence between the ratios ofthemassandchargeofdeuterons(d)andanti-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).
DOI
10.1038/nphys3432
WOS
WOS:000362188600013
Archivio
http://hdl.handle.net/11368/2866106
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84943198109
http://www.nature.com/nphys/index.html
Diritti
open access
license:digital rights management non definito
FVG url
https://arts.units.it/bitstream/11368/2866106/2/Precision measurement of the mass difference between light nuclei and anti-nuclei.pdf
Soggetti
  • Physics and Astronomy...

Scopus© citazioni
29
Data di acquisizione
Jun 15, 2022
Vedi dettagli
Web of Science© citazioni
34
Data di acquisizione
Mar 22, 2024
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