3ΛH and 3Λ¯H¯ production in Pb-Pb collisions at √sNN = 2.76 TeV

Adam, J. and Antičić, Tome and Erhardt, Filip and Planinić, Mirko and Poljak, Nikola and Simatović, Goran and Utrobičić, Antonija and Zyzak, M. (ALICE Collaboration) (2016) 3ΛH and 3Λ¯H¯ production in Pb-Pb collisions at √sNN = 2.76 TeV. Physics Letters B, 754. pp. 360-372. ISSN 0370-2693

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Abstract

The production of the hypertriton nuclei ^3_ΛH and ^3_Λ-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_ΛH yield in one unity of rapidity, dN/dy × B.R.(^3_ΛH → ^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_ΛH(3He×Λ/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_ΛH lifetime, τ = 181^+54_−39(stat.) ± 33(syst.) ps is in agreement within 1σ with the world average value.

Item Type: Article
Keywords: hypertriton, production, Pb-Pb, 2.76 TeV
Date: 25 January 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 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 (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3. Received 12 July 2015. Received in revised form 21 January 2016. Accepted 21 January 2016. Available online 25 January 2016.
Divisions: Faculty of Science > Department of Physics
Publisher: Elsevier
Depositing User: Nikola Poljak
Date Deposited: 26 Feb 2016 11:32
Last Modified: 30 May 2016 18:37
URI: http://digre.pmf.unizg.hr/id/eprint/4520

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