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

Abstract

© 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.

Authors:
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). et al.
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Org.:
The STAR Collaboration
OSTI Identifier:
1615588
Alternate Identifier(s):
OSTI ID: 1616102
Report Number(s):
BNL-213863-2020-JAAM; BNL-211607-2019-JAAM
Journal ID: ISSN 1745-2473
Grant/Contract Number:  
SC0012704; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 16; Journal Issue: 4; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; experimental nuclear physics; experimental particle physics

Citation Formats

Adam, Jaroslav. Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton. United States: N. p., 2020. Web. https://doi.org/10.1038/s41567-020-0799-7.
Adam, Jaroslav. Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton. United States. https://doi.org/10.1038/s41567-020-0799-7
Adam, Jaroslav. Mon . "Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton". United States. https://doi.org/10.1038/s41567-020-0799-7. https://www.osti.gov/servlets/purl/1615588.
@article{osti_1615588,
title = {Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton},
author = {Adam, Jaroslav},
abstractNote = {© 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.},
doi = {10.1038/s41567-020-0799-7},
journal = {Nature Physics},
number = 4,
volume = 16,
place = {United States},
year = {2020},
month = {3}
}

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Works referenced in this record:

The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
journal, March 2003

  • 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
  • DOI: 10.1016/S0168-9002(02)01964-2

The STAR MAPS-based PiXeL detector
journal, November 2018

  • Contin, Giacomo; Greiner, Leo; Schambach, Joachim
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 907
  • DOI: 10.1016/j.nima.2018.03.003

Multigap RPCs in the STAR experiment at RHIC
journal, January 2012

  • Llope, W. J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 661
  • DOI: 10.1016/j.nima.2010.07.086

A new determination of the binding-energy values of the light hypernuclei (A ⩽ 15)
journal, January 1973


Hyperon–nucleon interaction within chiral effective field theory revisited
journal, March 2020


Properties of the bound Λ(Σ) NN system and hyperon-nucleon interactions
journal, June 1995


The Hypernuclei H Λ 4 e and H Λ 4 : Challenges for Modern Hyperon-Nucleon Forces
journal, April 2002


Ab Initio Description of p -Shell Hypernuclei
journal, November 2014


The hypertriton in effective field theory
journal, July 2002


Observation of an Antimatter Hypernucleus
journal, March 2010


Do hyperons exist in the interior of neutron stars?
journal, February 2016


Review of Particle Physics
journal, August 2018


Measurement of the mass difference between top quark and antiquark in pp collisions at s = 8  TeV
journal, July 2017


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


Measurement of the properties of the Ω ¯ + and Ω hyperons
journal, August 1998


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


CPT violation and the standard model
journal, June 1997


Light nuclei and hypernuclei from quantum chromodynamics in the limit of SU(3) flavor symmetry
journal, February 2013


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


Measurement of the H Λ 3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider
journal, May 2018


Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations
journal, March 2015


Hypernuclei and massive neutron stars
journal, June 2017


Resolving the Λ Hypernuclear Overbinding Problem in Pionless Effective Field Theory
journal, September 2018


Antinuclei in heavy-ion collisions
journal, October 2018


CODATA recommended values of the fundamental physical constants: 2014
journal, September 2016


A compilation of binding energy values of light hypernuclei
journal, February 1967


A determination of the binding-energy values of light hypernuclei
journal, March 1968


Properties of H 3 Λ
journal, January 1970


50 years of hypernuclear physics
journal, May 2005


Phenomenological study of s-shell hypernuclei with ΛN and ΛNN potentials
journal, October 1972


Addendum to triton and hypertriton binding energies calculated from SU 6 quark-model baryon-baryon interactions
journal, February 2008


Three-body hypernuclei in pionless effective field theory
journal, September 2019


Implications of an increased Λ-separation energy of the hypertriton
journal, February 2020


Review of Particle Physics
text, January 2008