The production of the hypertriton nuclei HÎ3 and H[U+203E]Î-3 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 HÎ3 yield in one unity of rapidity, dN/dyÃB.R.(HÎ3âHe3,Ï-)=(3.86±0.77(stat.)±0.68(syst.))Ã10-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=HÎ3/(He3ÃÎ/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 HÎ3 lifetime, Ï=181-39+54(stat.)±33(syst.)ps is in agreement within 1Ï with the world average value.
3ÎH and 3ÎH production in Pb-Pb collisions at âsNN=2.76 TeV
DE CARO, ANNALISA;DE GRUTTOLA, DANIELE;DE PASQUALE, Salvatore;FUSCO GIRARD, Mario;MENINNO, ELISA;PAGANO, PAOLA;VIRGILI, Tiziano;CALIVA', Alberto
2016-01-01
Abstract
The production of the hypertriton nuclei HÎ3 and H[U+203E]Î-3 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 HÎ3 yield in one unity of rapidity, dN/dyÃB.R.(HÎ3âHe3,Ï-)=(3.86±0.77(stat.)±0.68(syst.))Ã10-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=HÎ3/(He3ÃÎ/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 HÎ3 lifetime, Ï=181-39+54(stat.)±33(syst.)ps is in agreement within 1Ï with the world average value.File | Dimensione | Formato | |
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