skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

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. Also, 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 ($$-\atop{d}$$), and 3He and 3$$-\atop{He}$$nuclei carried out with the ALICE (A Large Ion Collider Experiment) 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. In conclusion, 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).

Authors:
 [1]
  1. Czech Technical University in Prague (Czech Republic). Faculty of Nuclear Sciences and Physical Engineering. et al.
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
ALICE Collaboration
OSTI Identifier:
1339376
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 10; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Experimental nuclear physics; Experimental particle physics

Citation Formats

Adam, J. Precision measurement of the mass difference between light nuclei and anti-nuclei. United States: N. p., 2015. Web. doi:10.1038/nphys3432.
Adam, J. Precision measurement of the mass difference between light nuclei and anti-nuclei. United States. doi:10.1038/nphys3432.
Adam, J. Mon . "Precision measurement of the mass difference between light nuclei and anti-nuclei". United States. doi:10.1038/nphys3432. https://www.osti.gov/servlets/purl/1339376.
@article{osti_1339376,
title = {Precision measurement of the mass difference between light nuclei and anti-nuclei},
author = {Adam, J.},
abstractNote = {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. Also, 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 ($-\atop{d}$), and 3He and 3$-\atop{He}$nuclei carried out with the ALICE (A Large Ion Collider Experiment) 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. In conclusion, 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},
journal = {Nature Physics},
issn = {1745-2473},
number = 10,
volume = 11,
place = {United States},
year = {2015},
month = {8}
}

Works referenced in this record:

Precision Mass Spectroscopy of the Antiproton and Proton Using Simultaneously Trapped Particles
journal, April 1999


The STAR experiment at the relativistic heavy ion collider
journal, January 1994


PHENIX experiment at RHIC
journal, January 1994


Resonant quantum transitions in trapped antihydrogen atoms
journal, March 2012

  • Amole, C.; Ashkezari, M. D.; Baquero-Ruiz, M.
  • Nature, Vol. 483, Issue 7390
  • DOI: 10.1038/nature10942

One-Particle Measurement of the Antiproton Magnetic Moment
journal, March 2013


Data tables for Lorentz and C P T violation
journal, March 2011


The deuteron binding energy and the neutron mass
journal, May 1999


The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
journal, October 2010

  • Alme, J.; Andres, Y.; Appelshäuser, H.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 622, Issue 1
  • DOI: 10.1016/j.nima.2010.04.042

Measurement of the positronium 1 3 S 1 –2 3 S 1 interval by continuous-wave two-photon excitation
journal, July 1993


Effective field theory of nuclear forces
journal, January 1999


Two-photon laser spectroscopy of antiprotonic helium and the antiproton-to-electron mass ratio
journal, July 2011

  • Hori, Masaki; Sótér, Anna; Barna, Daniel
  • Nature, Vol. 475, Issue 7357
  • DOI: 10.1038/nature10260

Review of Particle Physics
journal, August 2014


Experimental observation of antideuteron production
journal, September 1965

  • Massam, T.; Muller, Th.; Righini, B.
  • Il Nuovo Cimento, Vol. 39, Issue 1
  • DOI: 10.1007/BF02814251

An experimental limit on the charge of antihydrogen
journal, June 2014

  • Amole, C.; Ashkezari, M. D.; Baquero-Ruiz, M.
  • Nature Communications, Vol. 5, Issue 1
  • DOI: 10.1038/ncomms4955

Performance of the ALICE Time-Of-Flight detector at the LHC
journal, April 2013


Measurement of the antineutron mass
journal, September 1986


Observation of antihelium-3
journal, September 1971


Measurement of the W -boson mass
journal, October 1990


Measurements of antideuteron absorption and stripping cross sections at the momentum 13.3 GeV/c
journal, September 1971


New high-precision comparison of electron and positron g factors
journal, July 1987

  • Van Dyck, Robert S.; Schwinberg, Paul B.; Dehmelt, Hans G.
  • Physical Review Letters, Vol. 59, Issue 1
  • DOI: 10.1103/PhysRevLett.59.26

CODATA recommended values of the fundamental physical constants: 2010
journal, November 2012


Observation of Antideuterons
journal, June 1965


    Works referencing / citing this record:

    Particle identification in ALICE: a Bayesian approach
    journal, May 2016