First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00636982" target="_blank" >RIV/61389005:_____/25:00636982 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/25:00636982 RIV/68407700:21340/25:00388754
Result on the web
<a href="https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.162301" target="_blank" >https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.162301</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.134.162301" target="_blank" >10.1103/PhysRevLett.134.162301</a>
Alternative languages
Result language
angličtina
Original language name
First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC
Original language description
In this Letter, the first evidence of the 4((Lambda) over bar)(He) over bar antihypernucleus is presented, along with the first measurement at the LHC of the production of (anti)hypernuclei with mass number A = 4, specifically (anti)H-4(Lambda) and (anti)He-4(Lambda). In addition, the antiparticle-to-particle ratios for both hypernuclei (4((Lambda) over bar)(H) over bar /4(Lambda)H and 4((Lambda) over bar)(He) over bar/He-4(Lambda)) are shown, which are sensitive to the baryochemical potential of the strongly interacting matter created in heavy-ion collisions. The results are obtained from a data sample of central Pb-Pb collisions, collected during the 2018 LHC data taking at a center-of-mass energy per nucleon pair of root sNN = 5.02 TeV. The yields measured for the average of the charge-conjugated states are found to be [0.78 +/- 0.19(stat) +/- 0.17(syst)] x 10(-6) for the (anti)H-4(Lambda) and [1.08 +/- 0.34(stat) +/- 0.20(syst)] x 10(-6) for the (anti)He-4(Lambda), and the measured antiparticle-to-particle ratios are in agreement with unity. The presence of (anti)H-4(Lambda) and (anti)He-4(Lambda) excited states is expected to strongly enhance the production yield of these hypernuclei. The yield values exhibit a combined deviation of 3.3 sigma from the theoretical ground-state-only expectation, while the inclusion of the excited states in the calculations leads to an agreement within 0.6 sigma with the present measurements. Additionally, the measured (anti)H-4(Lambda) and (anti)He-4(Lambda) masses are compatible with the world-average values within the uncertainties.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10304 - Nuclear physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Letters
ISSN
0031-9007
e-ISSN
1079-7114
Volume of the periodical
134
Issue of the periodical within the volume
16
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
162301
UT code for WoS article
001498376500001
EID of the result in the Scopus database
2-s2.0-105003818892