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$^{3}_{\Lambda}\mathrm H$ and $^{3}_{\bar{\Lambda}} \overline{\mathrm H}$ production in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV

J. Adam Laurent Aphecetche 1 B. Audurier 1 A. Baldisseri 2 Guillaume Batigne 1 I. Belikov 3 H. Borel 2 J. Castillo Castellanos 2 J.L. Charvet 2 C. Cheshkov 4 B. Cheynis 4 L. Ducroux 4 Magali Estienne 1 Marie Germain 1 J.-Y. Grossiord 4 B. Hippolyte 3 A. Lardeux 2 J. Martin Blanco 1 Gines Martinez Garcia 1 L. Massacrier 1 L. Molnar 3 D.A. Moreira De Godoy 1 A. Morreale 1 H. Pereira Da Costa 2 Philippe Pillot 1 F. Rami 3 L. Ronflette 1 C. Roy 3 X. Sanchez Castro 3 Alexandre Shabetai 1 Diego Stocco 1 B. Teyssier 4 R. Tieulent 4 A. Uras 4 R. Vernet 5 M. Wang 1 G. Conesa Balbastre 6 J. Faivre 6 C. Furget 6 R. Guernane 6 S. Kox 6 J.S. Real 6 C. Silvestre 6 A. Vauthier 6 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 M. Tarhini 7 L. Valencia Palomo 7
1 SUBATECH - Laboratoire SUBATECH Nantes
2 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
3 IPHC - Institut Pluridisciplinaire Hubert Curien
4 IPNL - Institut de Physique Nucléaire de Lyon
5 CC-IN2P3 - Centre de Calcul de l'IN2P3
6 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
7 IPNO - Institut de Physique Nucléaire d'Orsay
Abstract : The production of the hypertriton nuclei $^{3}_{\Lambda}\mathrm H$ and $^{3}_{\bar{\Lambda}} \overline{\mathrm H}$ has been measured for the first time in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with the ALICE experiment at LHC energies. The total yield, d$N$/d$y$ $\times \mathrm{B.R.}_{\left( ^{3}_{\Lambda}\mathrm H \rightarrow ^{3}\mathrm{He},\pi^{-} \right)} = \left( 3.86 \pm 0.77 (\mathrm{stat.}) \pm 0.68 (\mathrm{syst.})\right) \times 10^{-5}$ 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 $B_2$ of deuterons and the $B_3$ of $^{3}\mathrm{He}$ nuclei. The ratio of yields $S_3$ = $^{3}_{\Lambda}\mathrm H$/($^{3}\mathrm{He}$ $\times \Lambda/\mathrm{p}$) was measured to be $S_3$ = 0.60 $\pm$ 0.13 (stat.) $\pm$ 0.21 (syst.) in 0-10% centrality events; this value is compared to different theoretical models. The measured $S_3$ is fully compatible with thermal model predictions. The measured $^{3}_{\Lambda}\mathrm H$ lifetime, $ \tau = 181^{+54}_{-39} (\mathrm{stat.}) \pm 33 (\mathrm{syst.})\ \mathrm{ps}$ is compatible within 1$\sigma$ with the world average value.
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http://hal.in2p3.fr/in2p3-01169683
Contributor : Sylvie Flores <>
Submitted on : Tuesday, June 30, 2015 - 8:41:11 AM
Last modification on : Tuesday, January 5, 2021 - 9:30:20 AM

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IN2P3 | CNRS | DSM-IRFU | DRS-IPHC | IPHC | UNIV-NANTES | CEA | SUBATECH | LPSC | IPNO | CEA-UPSAY | UNIV-LYON1 | CEA-DRF | SITE-ALSACE | IMT-ATLANTIQUE | SUBATECH-PLASMA | IP2I | UDL | UGA

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J. Adam, Laurent Aphecetche, B. Audurier, A. Baldisseri, Guillaume Batigne, et al.. $^{3}_{\Lambda}\mathrm H$ and $^{3}_{\bar{\Lambda}} \overline{\mathrm H}$ production in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. Physics Letters B, Elsevier, 2016, 754, pp.360-372. ⟨10.1016/j.physletb.2016.01.040⟩. ⟨in2p3-01169683⟩

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