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:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States). et al.
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (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; TRN: US2106366
- 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. doi: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 = {Mon Mar 09 00:00:00 EDT 2020},
month = {Mon Mar 09 00:00:00 EDT 2020}
}
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