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

Title: Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton

Journal Article · · Nature Physics
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). et al.

© 2020, The Author(s), under exclusive licence to Springer Nature Limited. According to the CPT theorem, which states that the combined operation of charge conjugation, parity transformation and time reversal must be conserved, particles and their antiparticles should have the same mass and lifetime but opposite charge and magnetic moment. Here, we test CPT symmetry in a nucleus containing a strange quark, more specifically in the hypertriton. This hypernucleus is the lightest one yet discovered and consists of a proton, a neutron and a Λ hyperon. With data recorded by the STAR detector1–3 at the Relativistic Heavy Ion Collider, we measure the Λ hyperon binding energy BΛ for the hypertriton, and find that it differs from the widely used value4 and from predictions5–8, where the hypertriton is treated as a weakly bound system. Our results place stringent constraints on the hyperon–nucleon interaction9,10 and have implications for understanding neutron star interiors, where strange matter may be present11. A precise comparison of the masses of the hypertriton and the antihypertriton allows us to test CPT symmetry in a nucleus with strangeness, and we observe no deviation from the expected exact symmetry.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The STAR Collaboration
Grant/Contract Number:
SC0012704; AC02-05CH11231
OSTI ID:
1615588
Alternate ID(s):
OSTI ID: 1616102
Report Number(s):
BNL-213863-2020-JAAM; BNL-211607-2019-JAAM; TRN: US2106366
Journal Information:
Nature Physics, Vol. 16, Issue 4; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

References (44)

Observation of an Antimatter Hypernucleus journal March 2010
Hypernuclei and massive neutron stars journal June 2017
Resolving the Λ Hypernuclear Overbinding Problem in Pionless Effective Field Theory journal September 2018
Multigap RPCs in the STAR experiment at RHIC journal January 2012
The hypertriton in effective field theory journal July 2002
The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
  • Anderson, M.; Berkovitz, J.; Betts, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01964-2
journal March 2003
The Hypernuclei H Λ 4 e and H Λ 4 : Challenges for Modern Hyperon-Nucleon Forces journal April 2002
Do hyperons exist in the interior of neutron stars? journal February 2016
Antinuclei in heavy-ion collisions journal October 2018
Ab Initio Description of p -Shell Hypernuclei journal November 2014
Implications of an increased Λ-separation energy of the hypertriton journal February 2020
Measurement of the mass difference between top quark and antiquark in pp collisions at s = 8  TeV journal July 2017
A determination of the binding-energy values of light hypernuclei journal March 1968
Review of Particle Physics text January 2008
Precision measurement of the mass difference between light nuclei and anti-nuclei journal August 2015
A new determination of the binding-energy values of the light hypernuclei (A ⩽ 15) journal January 1973
Measurement of the mass difference between top and anti-top quarks in pp collisions at <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>7</mml:mn><mml:mtext> TeV</mml:mtext></mml:math> using the ATLAS detector journal January 2014
Properties of H 3 Λ journal January 1970
Light nuclei and hypernuclei from quantum chromodynamics in the limit of SU(3) flavor symmetry journal February 2013
Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations journal March 2015
The STAR MAPS-based PiXeL detector
  • Contin, Giacomo; Greiner, Leo; Schambach, Joachim
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 907 https://doi.org/10.1016/j.nima.2018.03.003
journal November 2018
Data tables for Lorentz and C P T violation journal March 2011
Review of Particle Physics journal August 2018
CPT violation and the standard model journal June 1997
Addendum to triton and hypertriton binding energies calculated from SU 6 quark-model baryon-baryon interactions journal February 2008
CODATA recommended values of the fundamental physical constants: 2014 journal September 2016
A compilation of binding energy values of light hypernuclei journal February 1967
Hyperon–nucleon interaction within chiral effective field theory revisited journal March 2020
Phenomenological study of s-shell hypernuclei with ΛN and ΛNN potentials journal October 1972
Three-body hypernuclei in pionless effective field theory journal September 2019
Properties of the bound Λ(Σ) NN system and hyperon-nucleon interactions journal June 1995
Measurement of the H Λ 3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider journal May 2018
H Λ 3 and H Λ 3 lifetime measurement in Pb–Pb collisions at s NN = 5.02  TeV via two-body decay journal October 2019
50 years of hypernuclear physics journal May 2005
Data Tables for Lorentz and cpt Violation conference January 2012
Review of Particle Physics text January 2018
Review of Particle Physics text January 2012
Codata Recommended Values Of The Fundamental Physical Constants: 2014 text January 2015
Observation of an Antimatter Hypernucleus text January 2010
Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations text January 2014
Precision measurement of the mass difference between light nuclei and anti-nuclei text January 2015
Do hyperons exist in the interior of neutron stars ? text January 2015
Antinuclei in Heavy-Ion Collisions text January 2018
The Hypertriton in Effective Field Theory text January 2001


Similar Records

Measurements of the lightest hypernucleus ($_{Λ}^{3}{H}$): progress and perspective
Journal Article · Thu Nov 23 00:00:00 EST 2023 · Science Bulletin · OSTI ID:1615588

A single particle energies
Conference · Wed Sep 01 00:00:00 EDT 1993 · OSTI ID:1615588

Hypertriton production in relativistic heavy ion collisions
Journal Article · Tue May 01 00:00:00 EDT 2018 · Physics Letters. B · OSTI ID:1615588