Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions

Andronic, A.; Braun‐Munzinger, P.; Stachel, J.; Stöcker, H.

doi:10.1016/j.physletb.2011.01.053

Cited by 402 publications

(348 citation statements)

References 44 publications

(72 reference statements)

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“…An estimation of the expected yields for hypernuclei with the upgraded ALICE detector was made assuming 8 ×10 9 Pb-Pb collisions in the 0-10% centrality class, corresponding to L int = 10 nb −1 . The 3 Λ H , 4 Λ H and 4 Λ He yields per unit of rapidity predicted at central rapidity (dN/dy) by the statistical hadronization model for central Pb-Pb collisions at √ s NN = 5.5 TeV are reported in [8]. For the chemical freeze-out temperature that currently best describes the LHC data (T ch = 156 MeV), the expected hypertriton yield is dN/dy= 1 ×10 −4 .…”

Section: Discussionmentioning

confidence: 99%

“…If hypernuclei are produced through the coalescence of protons, neutrons and hyperons at freeze-out [6], their yield can provide a measurement of the local correlation between baryons and the strangeness-carrying hyperons [7]. In the thermal model, the abundance of particles is determined by the thermodynamic equilibrium conditions [8]. A constant ratio of entropy to baryonic number [9] could explain why objects with such a small binding energy (few MeV) could survive the high temperature (≈ 170 MeV) expanding fireball.…”

Section: Introductionmentioning

confidence: 99%

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Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Piano¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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In high-energy heavy-ion collisions nuclei and hypernuclei emerge from the hot and dense fireball formed in the reaction region. Thanks to its excellent particle identification and momentum measurement performance, the ALICE detector allows for the identification of deuterons, tritons, 3 He and 4 He and the corresponding anti-nuclei. This is achieved via the measurement of their specific energy loss in the Time Projection Chamber and the velocity measurement by the Time-Of-Flight detector. Moreover, thanks to the Inner Tracking System capability to separate primary from secondary vertices, it is possible to identify (anti-)hypertriton through the mesonic weak decay 3 Λ H → ( 3 He + π − ). The direct decay time measurement of (anti-)hypertriton is difficult, but the excellent determination of primary and decay vertices, i.e. of the decay length, allows for the measurement of mean lifetime via an exponential fit of the proper decay time distribution. Results on the measurement of the hypertriton mean lifetime will be shown. Plans for the future LHC Run2 and Run3, with the expected improvements in the statistics and precision, will also be presented.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Piano¹

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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“…Thermal model calculations predict a maximum of the production of single and double hypernuclei close to top SIS 100 beam energies [16]. This maximum is reached due to a counterplay of increasing hyperon production and decreasing production of light nuclei with higher beam energy.…”

Section: Existence Of Exotic Strange Objectsmentioning

confidence: 93%

The Compressed Baryonic Matter experiment at FAIR

Höhne

2018

EPJ Web Conf.

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Abstract.The CBM experiment will investigate highly compressed baryonic matter created in A+A collisions at the new FAIR research center. With a beam energy range up to 11 AGeV for the heaviest nuclei at the SIS 100 accelerator, CBM will investigate the QCD phase diagram in the intermediate range, i.e. at moderate temperatures but high net-baryon densities. This intermediate range of the QCD phase diagram is of particular interest, because a first order phase transition ending in a critical point and possibly new highdensity phases of strongly interacting matter are expected. In this range of the QCD phase diagram only exploratory measurements have been performed so far. CBM, as a next generation, high-luminosity experiment, will substantially improve our knowledge of matter created in this region of the QCD phase diagram and characterize its properties by measuring rare probes such as multi-strange hyperons, dileptons or charm, but also with event-by-event fluctuations of conserved quantities, and collective flow of identified particles. The experimental preparations with special focus on hadronic observables and strangeness is presented in terms of detector development, feasibility studies and fast track reconstruction. Preparations are progressing well such that CBM will be ready with FAIR start. As quite some detectors are ready before, they will be used as upgrades or extensions of already running experiments allowing for a rich physics program prior to FAIR start. Mapping the high density region of the QCD phase diagram with CBMHeavy ion experiments at relativistic energies are the experimental tool in order to map the conjectured QCD phase diagram, see figure 1 (left), which is of fundamental interest for understanding the strong interaction and strongly interacting matter in particular in the non-perturbative regime. In dependence on the collision energy strongly interacting matter of varying temperature and baryon chemical potential is created. The exploration of matter at high temperatures but low baryon chemical potential in heavy-ion collisions at the highest energies at RHIC and LHC [1,3] reveals insight into the characteristics of the quark-gluon plasma and the phase transition to hadronic matter. Experimental results can be compared to lattice QCD calculations at µ B = 0 which predict a crossover from partonic to hadronic matter at temperatures around 160 MeV [4] in accordance to experimental findings. According to lattice QCD, the phase transition is driven by the energy density and occurs at a critical density on the order of 1 GeV/fm 3 . At large baryon densities the QCD phase diagram is uncharted territory as lattice calculations are not applicable, and as only few experimental measurements mainly of bulk

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“…An experimental confirmation of such a state would therefore be an enormous advance in the understanding of the hyperon interaction. Hypernuclei are known to be produced in heavy ion collisions already for a long time [35,36,37,38], and the recent discoveries of the first anti-hypertriton [39] and anti-α [40] has fueled the interest in the field of hypernuclear physics. One can discriminate two distinct mechanisms for hypercluster formation in heavy ion collisions.…”

Section: Hypernucleimentioning

confidence: 99%

Strangeness in Quark Matter: Opening Talk

Steinheimer

Lang

Hees

et al. 2014

J. Phys.: Conf. Ser.

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Abstract. We discuss several new developments in the field of strange and heavy flavor physics in high energy heavy ion collisions. As shown by many recent theoretical works, heavy flavored particles give us a unique opportunity to study the properties of systems created in these collisions. Two in particular important aspects, the production of (multi) strange hypernuclei and the properties of heavy flavor mesons, are at the core of several future facilities and will be discussed in detail.As strange quarks have to be newly produced during the hot and dense stage of a relativistic nuclear collision, they carry information, on the properties of the matter that was created [1,2,3,4], to the observed final particle state. The enhancement of strange particle production is discussed [5,6,7,8,9] as a possible signal for the creation of a deconfined phase. Recently several observables, regarding strange and charm quarks have shown the importance of understanding the dynamics of strangeness and charm production in heavy ion collisions:• Strange particle ratios and yields from the ALICE collaboration may indicate that there is either no unique chemical freeze out point for strange an non-strange particles [10,11,12,13], or the light quark phase space is severely over-saturated [14].• Lattice calculations on the stability of the H-dibaryon indicate it might be either very loosely bound or a resonant state [15,16,17].• Viscous hydrodynamics, with fluctuating initial conditions [18] and finite but small viscous corrections, seems to describe strange hadron observables even at large baryon densities [19,20].• The hydrodynamic model calculations show sensitivity on the life time of the system and the applied equation of state [21].• There are indications that systems created in high energy p+p and p+Pb collisions can thermalize/equilibrate to a certain degree and show signs of collectivity [22,23,24,25].• A polarization of Λ's due to the finite angular momentum of the fireball is expected [26].

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Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions

Abstract: We present, using the statistical model, an analysis of the production of light nuclei, hypernuclei and their antiparticles in central collisions of heavy nuclei. Based on these studies we provide predictions for the production yields of multiply-strange light nuclei.

Cited by 402 publications

References 44 publications

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

Production of (Anti-)(Hyper)nuclei in Pb–Pb Collisions Measured with ALICE at the LHC

The Compressed Baryonic Matter experiment at FAIR

Strangeness in Quark Matter: Opening Talk

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