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

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    Authors
    ALICE Collaboration
    Barnby, Lee cc
    Affiliation
    University of Birmingham
    Issue Date
    2015-08-17
    
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    Abstract
    The measurement of the mass differences for systems bound by the strong force has reached a very high precision with protons and anti-protons. 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 theories, 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 (d-bar ), 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 nuclei. 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).
    Citation
    ALICE Collaboration (2015) 'Precision measurement of the mass difference between light nuclei and anti-nucle', Nature Physics, 11 (10):811
    Publisher
    Springer Nature
    Journal
    Nature Physics
    URI
    http://hdl.handle.net/10545/622334
    DOI
    10.1038/nphys3432
    Additional Links
    http://www.nature.com/articles/nphys3432
    Type
    Article
    Language
    en
    ISSN
    17452473
    EISSN
    17452481
    ae974a485f413a2113503eed53cd6c53
    10.1038/nphys3432
    Scopus Count
    Collections
    Department of Electronics, Computing & Maths

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