Precise measurement of the mass difference and the binding energy of hypertriton and antihypertriton
Author's Department
Physics Department
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http://www.worldcat.org/oclc/1099920829
Document Type
Research Article
Publication Title
arXiv preprint arXiv:1904.10520
Publication Date
1-1-2019
doi
10.1038/s41567-020-0799-7
Abstract
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 detector{\cite{TPC,HFT,TOF}} 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 value{\cite{B_1973}} and from predictions{\cite{2019_weak, 1995_weak, 2002_weak, 2014_weak}}, where the hypertriton is treated as a weakly bound system. Our results place stringent constraints on the hyperon-nucleon interaction{\cite{Hammer2002, STAR-antiH3L}}, and have implications for understanding neutron star interiors, where strange matter may be present{\cite{Chatterjee2016}}. A precise comparison of the masses of the hypertriton and the antihypertriton allows us to test CPT symmetry in a nucleus with strangeness for the first time, and we observe no deviation from the expected exact symmetry.
First Page
409
Last Page
412
Recommended Citation
APA Citation
Hamed, A.
(2019). Precise measurement of the mass difference and the binding energy of hypertriton and antihypertriton. arXiv preprint arXiv:1904.10520, 16(4), 409–412.
10.1038/s41567-020-0799-7
https://fount.aucegypt.edu/faculty_journal_articles/365
MLA Citation
Hamed, Ahmad
"Precise measurement of the mass difference and the binding energy of hypertriton and antihypertriton." arXiv preprint arXiv:1904.10520, vol. 16,no. 4, 2019, pp. 409–412.
https://fount.aucegypt.edu/faculty_journal_articles/365