First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/68378271:_____/25:00636982 RIV/68407700:21340/25:00388754

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

First Measurement of A = 4 Hypernuclei and Antihypernuclei at the LHC

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

134

Číslo periodika v rámci svazku

16

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

162301

Kód UT WoS článku

001498376500001

EID výsledku v databázi Scopus

2-s2.0-105003818892