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

Adam, J.; Adamczyk, L.; Adams, J. R.; Adkins, J. K.; Agakishiev, G.; Bielčík, J.; Bielčíková, Jana; Chaloupka, P.; Federič, Pavol; Holub, L.; Kocan, M.; Kosarzewski, L. K.; Kramárik, L.; Líčeník, Robert; Moravcová, Z.; Rusňák, Jan; Šimko, Miroslav; Šumbera, Michal; Vaněk, Jan

doi:https://dx.doi.org/10.1038/s41567-020-0799-7

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

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SYSNO ASEP	0523917
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton
Author(s)	Adam, J. (US) Adamczyk, L. (PL) Adams, J. R. (US) Adkins, J. K. (US) Agakishiev, G. (RU) Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Chaloupka, P. (CZ) Federič, Pavol (UJF-V)_{ORCID, SAI} Holub, L. (CZ) Kocan, M. (CZ) Kosarzewski, L. K. (CZ) Kramárik, L. (CZ) Líčeník, Robert (UJF-V)_{ORCID, SAI} Moravcová, Z. (CZ) Rusňák, Jan (UJF-V)_{RID, ORCID, SAI} Šimko, Miroslav (UJF-V)_{ORCID, SAI} Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Vaněk, Jan (UJF-V)_{ORCID, SAI}
Number of authors	358
Source Title	Nature Physics. - : Nature Publishing Group - ISSN 1745-2473 Roč. 16, č. 4 (2020), s. 409-412
Number of pages	4 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	STAR collaboration ; heavy ion experiments
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Nuclear physics
R&D Projects	LTT18002 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Research Infrastructure	BNL-CZ II - 90109 - České vysoké učení technické v Praze
Method of publishing	Limited access
Institutional support	UJF-V - RVO:61389005
UT WOS	000518737400002
EID SCOPUS	85081642646
DOI	10.1038/s41567-020-0799-7
Annotation	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 Lambda hyperon. With data recorded by the STAR detector at the Relativistic Heavy Ion Collider, we measure the Lambda hyperon binding energy B Lambda for the hypertriton, and find that it differs from the widely used value and from predictions, where the hypertriton is treated as a weakly bound system. Our results place stringent constraints on the hyperon-nucleon interaction and have implications for understanding neutron star interiors, where strange matter may be present. 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.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2021
Electronic address	https://doi.org/10.1038/s41567-020-0799-7

Number of the records: 1