Abstract
Heavy-ion collision experiments offer a unique opportunity to study the production of (anti-) hyperon bound systems, called (anti-)hypernuclei. ALICE at the LHC measured the production of (anti-)hypertritons analyzing data collected in Pb–Pb collisions at the two center-of-mass energies of \(\sqrt {{{s}_{{NN}}}} \) = 2.76 and 5.02 TeV. The analysis is performed by exploiting the excellent particle identification performance of the ALICE detector, in particular the energy loss of charged tracks in the Time Projection Chamber. In addition, the Inner Tracking System was used to separate the (anti-)hypertriton’s weak decay products from primary tracks through the precise determination of secondary vertices. Results on the (anti-)hypertriton lifetime measurement are discussed and compared to model predictions. The hypertriton yields are discussed and compared to the predictions of the statistical hadronization model. Plans for the future LHC Runs 3 and 4, scheduled to start in 2022, with improvements in statistics and spatial precision are also presented.
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REFERENCES
J. M. Lattimer and M. Prakash, “The physics of neutron stars,” Science 304, 536–542 (2004); arXiv:astro-ph/0405262 [astro-ph].
J. Schaffner-Bielich, “Hypernuclear physics for neutron stars,” Nucl. Phys. A 804, 309–321 (2008); arXiv: 0801.3791 [astro-ph].
L. Tolos, M. Centelles, and A. Ramos, “The equation of state for the nucleonic and hyperonic core of neutron stars,” Publ. Astron. Soc. Aust. 34, e065 (2017).
R. H. Dalitz and G. Rajasekharan, “The spins and lifetimes of the light hypernuclei,” Phys. Lett. 1, 58–60 (1962).
H. Kamada, J. Golak, K. Miyagawa, H. Witała, and W. Gloeckle, “\(\pi \)-mesonic decay of the hypertriton,” Phys. Rev. C 57, 1595 (1998).
B. I. Abelev et al. (STAR Collab.), “Observation of an antimatter hypernucleus,” Science 328, 58–62 (2010); arXiv:1003.2030 [nucl-ex].
C. Rappold, E. Kim, D. Nakajima, T. Saito, O. Bertini, and S. Bianchin, “Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV,” Nucl. Phys. A 913, 170–184 (2013); arXiv:1305.4871 [nucl-ex].
J. Adam et al. (ALICE Collab.), “\(_{\Lambda }^{3}{\text{H}}\) and \(_{{\overline \Lambda }}^{3}\overline {\text{H}} \) production in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Lett. B 754, 360–372 (2016); arXiv:1506.08453 [nucl-ex].
P. A. Zyla et al. (Particle Data Group), “Review of Particle Physics,” Prog. Theor. Exp. Phys. 2020, 083C01 (2020).
D. Davis, “50 years of hypernuclear physics: I. The early experiments,” Nucl. Phys. A 754, 3 (2005).
L. Adamczyk et al. (STAR Collab.), “Measurement of the \(_{\Lambda }^{3}{\text{H}}\;\) lifetime in Au + Au collisions at the BNL relativistic heavy ion collider,” Phys. Rev. C 97, 054909 (2018).
S. Acharya et al. (ALICE Collab.), “\(_{\Lambda }^{3}{\text{H}}\) and \(_{{\overline \Lambda }}^{3}\overline {\text{H}} \) lifetime measurement in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 5.02 TeV via two-body decay,” Phys. Lett. B 797, 134905 (2019).
T. Chen and C. Guestrin, “A scalable tree boosting system,” in Proceedings of the 22nd ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (AMC Digital Laboratory, 2016), pp. 785–794.
H. Mansour and K. Higgins, “The decay rate of hypertriton,” Nuovo Cimento A 51, 180 (1979).
A. Andronic, P. Braun-Munzinger, K. Redlich, and J. Stachel, “Decoding the phase structure of QCD via particle production at high energy,” Nature 561, 321–330 (2018); arXiv:1710.09425 [nucl-th].
B. Abelev (ALICE Collab.), “Centrality dependence of \(\pi \), K, p production in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Rev. C 88, 044910 (2013).
B. Abelev (ALICE Collab.), “K \(_{S}^{0}\) and \(\Lambda \) production in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Rev. Lett. 111, 222301 (2013).
B. Abelev (ALICE Collab.), “Multi-strange baryon production at mid-rapidity in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Lett. B 728, 216–227 (2014).
B. Abelev (ALICE Collab.), “\({{K}^{{*0}}}\)(892) and \(\phi \)(1020) production in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Rev. C 91, 024609 (2015).
B. Abelev (ALICE Collab.), “\({{K}^{{*(892)0}}}\) [Key: use symbols from Ref. [19] ] and \(\phi \)(1020) production in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV,” Phys. Rev. C 91, 024609 (2015).
J. Adam (ALICE Collab.), “Production of light nuclei and anti-nuclei in pp and Pb–Pb collisions at energies available at the CERN Large Hadron Collider,” Phys. Rev. C 93, 024917 (2016).
S. Acharya (ALICE Collab.), “Production of \(^{4}\)He and \(^{4}\overline {{\text{He}}} \) in Pb–Pb collisions at \(\sqrt {{{s}_{{NN}}}} \) = 2.76 TeV at the LHC,” Nucl. Phys. A 971, 1–20 (2018).
Z. Citron et al., Preprint CERN-LPCC-2018-07 (CERN, Geneve, 2018); arXiv:1812.06772 [hep-ph].
B. Abelev et al. (ALICE Collab.), “Technical design report for the upgrade of the ALICE inner tracking system,” J. Phys. G 41, 087002 (2014).
H. Garcilazo, A. Valcarce, and T. Fernandez-Carames, “\(\Lambda NN\) and \(\Sigma NN\) systems at threshold. II. The effect of waves,” Phys. Rev. C 76, 034001 (2007).
T. Nagae et al., “Observation of a \(_{\Sigma }^{4}\)He bound state in the 4He(K – , π–) reaction at 600 MeV/\(c\),” Phys. Rev. Lett. 80, 1605–1609 (1998).
A. Borissov (ALICE Collab.), “Hyperon production in pp collisions at \(\sqrt s \) = 7 TeV at the LHC with ALICE,” EPJ Web Conf. 97, 00005 (2015).
B. B. Abelev et al. (ALICE Collab.), “Performance of the ALICE experiment at the CERN LHC,” Int. J. Mod. Phys. A 29, 1430044 (2014); arXiv:1402.4476 [nucl-ex].
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Borissov, A. Latest Results on (Anti-)Hypernuclei Production at the LHC with ALICE. Phys. Part. Nuclei 53, 177–183 (2022). https://doi.org/10.1134/S1063779622020228
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DOI: https://doi.org/10.1134/S1063779622020228