Hypertriton lifetime

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00603086" target="_blank" >RIV/61389005:_____/24:00603086 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevC.109.024001" target="_blank" >https://doi.org/10.1103/PhysRevC.109.024001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.109.024001" target="_blank" >10.1103/PhysRevC.109.024001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Hypertriton lifetime

Popis výsledku v původním jazyce

Over the last decade, conflicting values of the hypertriton HΛ3 lifetime τ(HΛ3) were extracted from relativistic heavy-ion (RHI) collision experiments, ranging from values compatible with the free-Λ lifetime τΛ - as expected naively for a very weakly bound Λ in HΛ3 - to lifetimes as short as τ(HΛ3)≈(0.4-0.7)τΛ. In a recent work [Phys. Lett. B 811, 135916 (2020)0370-269310.1016/j.physletb.2020.135916] we studied this HΛ3 lifetime puzzle theoretically using realistic three-body HΛ3 and He3 wave functions computed within the ab initio no-core shell model approach with interactions derived from chiral effective field theory to calculate the partial decay rate Γ(HΛ3→He3+π-). Significant but opposing contributions were found from ςNN admixtures in HΛ3 and from π - He3 final-state interaction. In particular, τ(HΛ3) was found to be strongly correlated with the Λ separation energy BΛ in HΛ3, the value of which is rather poorly known experimentally and, in addition, is known to suffer from sizable theoretical uncertainties inherent in the employed nuclear and hypernuclear interaction models. In the present work we find that these uncertainties propagate into τ(HΛ3), and thus limit considerably the theoretical precision of its computed value. Although none of the conflicting RHI measured τ(HΛ3) values can be excluded, but rather can be attributed to a poor knowledge of BΛ, we note the good agreement between the lifetime value τ(HΛ3)=242(28)ps computed at the lowest value BΛ=66keV reached by us and the very recent ALICE measured lifetime value τALICE(HΛ3)=253(11)(6)ps associated with the ALICE measured BΛ value BΛALICE=102(63)(67)keV [S. Acharya (ALICE Collaboration), Phys. Rev. Lett. 131, 102302 (2023)0031-900710.1103/PhysRevLett.131.102302].

Název v anglickém jazyce

Hypertriton lifetime

Popis výsledku anglicky

Over the last decade, conflicting values of the hypertriton HΛ3 lifetime τ(HΛ3) were extracted from relativistic heavy-ion (RHI) collision experiments, ranging from values compatible with the free-Λ lifetime τΛ - as expected naively for a very weakly bound Λ in HΛ3 - to lifetimes as short as τ(HΛ3)≈(0.4-0.7)τΛ. In a recent work [Phys. Lett. B 811, 135916 (2020)0370-269310.1016/j.physletb.2020.135916] we studied this HΛ3 lifetime puzzle theoretically using realistic three-body HΛ3 and He3 wave functions computed within the ab initio no-core shell model approach with interactions derived from chiral effective field theory to calculate the partial decay rate Γ(HΛ3→He3+π-). Significant but opposing contributions were found from ςNN admixtures in HΛ3 and from π - He3 final-state interaction. In particular, τ(HΛ3) was found to be strongly correlated with the Λ separation energy BΛ in HΛ3, the value of which is rather poorly known experimentally and, in addition, is known to suffer from sizable theoretical uncertainties inherent in the employed nuclear and hypernuclear interaction models. In the present work we find that these uncertainties propagate into τ(HΛ3), and thus limit considerably the theoretical precision of its computed value. Although none of the conflicting RHI measured τ(HΛ3) values can be excluded, but rather can be attributed to a poor knowledge of BΛ, we note the good agreement between the lifetime value τ(HΛ3)=242(28)ps computed at the lowest value BΛ=66keV reached by us and the very recent ALICE measured lifetime value τALICE(HΛ3)=253(11)(6)ps associated with the ALICE measured BΛ value BΛALICE=102(63)(67)keV [S. Acharya (ALICE Collaboration), Phys. Rev. Lett. 131, 102302 (2023)0031-900710.1103/PhysRevLett.131.102302].

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/GA22-14497S" target="_blank" >GA22-14497S: Posouvání hranic ab initio výpočtů jaderné struktury</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

109

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

024001

Kód UT WoS článku

001381066200001

EID výsledku v databázi Scopus

2-s2.0-85184822484