3ΛH and 3Λ¯H‾ production in Pb–Pb collisions at √sNN = 2.76 TeV
ALICE Collaboration. (2016). 3ΛH and 3Λ¯H‾ production in Pb–Pb collisions at √sNN = 2.76 TeV. Physics Letters B, 754, 360-372. doi:10.1016/j.physletb.2016.01.040
Published inPhysics Letters B
Rak, Jan |
© 2016 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license. Funded by SCOAP3.
The production of the hypertriton nuclei 3 H and 3 ¯ H 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.