The production of the hypertriton nuclei 3H and 3 ̄ H has been measured for the first time in Pb–Pb √3 collisions at sNN = 2.76 TeV with the ALICE experiment at LHC. The pT-integrated H yield in one unity of rapidity, dN/dy × B.R.3H→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 B 3 shows a dependence on the transverse momentum, similar to the B2 of deuterons and the B3 of 3He nuclei. The ratio of yields S3 =3H/(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 (stat.) ± 33(syst.) ps is in agreement within 1σ with the world average value.
HΛ3 and H[U+203E]Λ-3 production in Pb-Pb collisions at sNN=2.76 TeV
BEOLE', Stefania;Bianchi, L.;BOTTA, Elena;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;MASERA, Massimo;PUCCIO, MAXIMILIANO;TROGOLO, STEFANO;VERCELLIN, Ermanno;
2016-01-01
Abstract
The production of the hypertriton nuclei 3H and 3 ̄ H has been measured for the first time in Pb–Pb √3 collisions at sNN = 2.76 TeV with the ALICE experiment at LHC. The pT-integrated H yield in one unity of rapidity, dN/dy × B.R.3H→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 B 3 shows a dependence on the transverse momentum, similar to the B2 of deuterons and the B3 of 3He nuclei. The ratio of yields S3 =3H/(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 (stat.) ± 33(syst.) ps is in agreement within 1σ with the world average value.File | Dimensione | Formato | |
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