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

J. Adam; L. Aphecetche; B. Audurier; A. Baldisseri; Guillaume Batigne; I. Belikov; H. Borel; J. Castillo Castellanos; J.L. Charvet; C. Cheshkov; B. Cheynis; L. Ducroux; M. Estienne; M. Germain; J.-Y. Grossiord; B. Hippolyte; A. Lardeux; J. Martin Blanco; G. Martınez Garcıa; L. Massacrier; L. Molnar; D.A. Moreira De Godoy; A. Morreale; H. Pereira Da Costa; P. Pillot; F. Rami; L. Ronflette; C. Roy; X. Sanchez Castro; A. Shabetai; D. Stocco; B. Teyssier; R. Tieulent; A. Uras; R. Vernet; M. Wang; G. Conesa Balbastre; J. Faivre; C. Furget; R. Guernane; S. Kox; J.S. Real; C. Silvestre; A. Vauthier; Z. Conesa Del Valle; I. Das; B. Espagnon; C. Hadjidakis; I. Lakomov; C. Suire; J. D. Tapia Takaki; M. Tarhini; L. Valencia Palomo

doi:10.1016/j.physletb.2016.01.040

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

J. Adam L. 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 M. Estienne ¹ M. Germain ¹ J.-Y. Grossiord ⁴ B. Hippolyte ³ A. Lardeux ² J. Martin Blanco ¹ G. Martınez Garcıa ¹ L. Massacrier ¹ L. Molnar ³ D.A. Moreira De Godoy ¹ A. Morreale ¹ H. Pereira Da Costa ² P. Pillot ¹ F. Rami ³ L. Ronflette ¹ C. Roy ³ X. Sanchez Castro ³ A. Shabetai ¹ D. 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.

Type de document :

Article dans une revue

Physics Letters B, Elsevier, 2016, 754, pp.360-372. 〈10.1016/j.physletb.2016.01.040〉

Domaine :

Physique [physics] / Physique Nucléaire Expérimentale [nucl-ex]

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http://hal.in2p3.fr/in2p3-01169683
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Soumis le : mardi 30 juin 2015 - 08:41:11
Dernière modification le : mardi 19 juin 2018 - 01:19:58

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

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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

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