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 H3_lambda 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 3H-lambda lifetime, τ = 181+54 (stat.) ± 33(syst.) ps is in agreement within 1σ with the world average value.

HΛ3 and (anti)H(anti)Λ-3 production in Pb-Pb collisions at √sNN = 2.76 TeV / Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Alme, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 754:(2016), pp. 360-372. [10.1016/j.physletb.2016.01.040]

HΛ3 and (anti)H(anti)Λ-3 production in Pb-Pb collisions at √sNN = 2.76 TeV

CAMERINI, Paolo;FRAGIACOMO, ENRICO;LEA, RAMONA;LUPARELLO, GRAZIA;MARGAGLIOTTI, GIACOMO;PIANO, STEFANO;RUI, RINALDO;Zaccolo, V.;
2016-01-01

Abstract

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 H3_lambda 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 3H-lambda lifetime, τ = 181+54 (stat.) ± 33(syst.) ps is in agreement within 1σ with the world average value.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2878485
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