3ΛH and 3Λ¯ production in Pb–Pb collisions at √sNN = 2.76 TeV
Özet
The production of the hypertriton nuclei 3ΛH and 3Λ¯ has been measured for the first time in Pb–Pb
collisions at √sNN = 2.76 TeV with the ALICE experiment at LHC. The pT-integrated 3
!H yield in one
unity of rapidity, dN/dy × B.R.
!
3
!H→3He,π−" = (3.86 ± 0.77(stat.) ± 0.68(syst.)) × 10−5 in the 0–10% most
central collisions, is consistent with the predictions from a statistical thermal model using the same
temperature as for the light hadrons. The coalescence parameter B3 shows a dependence on the
transverse momentum, similar to the B2 of deuterons and the B3 of 3He nuclei. The ratio of yields
S3 = 3
!H/(3He×!/p) was measured to be S3 = 0.60±0.13(stat.)±0.21(syst.) in 0–10% centrality events;
this value is compared to different theoretical models. The measured S3 is compatible with thermal
model predictions. The measured 3
!H lifetime, τ = 181+54
−39 (stat.) ± 33(syst.) ps is in agreement within 1σ
with the world average value.
Koleksiyonlar
DSpace@Karatay by Karatay University Institutional Repository is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 Unported License..