Hypertriton production in relativistic heavy ion collisions

doi:10.1016/j.physletb.2018.03.003

Title: Hypertriton production in relativistic heavy ion collisions

Abstract

Based on the phase-space distributions of freeze-out nucleons and Λ hyperons from a blast-wave model, we study hypertriton production in the coalescence model. Including both the coalescence of Λ with proton and neutron as well as with deuteron, which is itself formed from the coalescence of proton and neutron, we study how the production of hypertriton is affected if nucleons and deuterons are allowed to stream freely after freeze-out. Using central Pb+Pb collisions at $\sqrt{s_{N N}} = 2.76$ as an example, we find that this only reduces slightly the hypertriton yield, which has a value consistent with the experimental data, even if the volume of the system has expanded to a size similar to the freeze-out volume for a hyertriton if its dissociation cross section by pions in the system is given by its geometric size. Our results thus suggest that the hypertriton yield in relativistic heavy ion collisions is essentially determined at the time when nucleons and deuterons freeze out, although it still undergoes reactions with pions.

Authors:

Zhang, Zhen ^[1]; Ko, Che Ming ^[1]

Texas A & M Univ., College Station, TX (United States). Cyclotron Inst. Dept. of Physics and Astronomy

Publication Date:: 2018-03-06

Research Org.:: Texas A & M Univ., College Station, TX (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); Welch Foundation (United States)

OSTI Identifier:: 1499144

Grant/Contract Number:: SC0015266; A-1358

Resource Type:: Accepted Manuscript

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Volume: 780; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    Zhang, Zhen, and Ko, Che Ming. Hypertriton production in relativistic heavy ion collisions.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.physletb.2018.03.003.

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                    Zhang, Zhen, & Ko, Che Ming. Hypertriton production in relativistic heavy ion collisions.  United States.  doi:10.1016/j.physletb.2018.03.003.

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                    Zhang, Zhen, and Ko, Che Ming. Tue .  
        "Hypertriton production in relativistic heavy ion collisions".  United States.  doi:10.1016/j.physletb.2018.03.003.  https://www.osti.gov/servlets/purl/1499144.

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@article{osti_1499144,

  title        = {Hypertriton production in relativistic heavy ion collisions},

  author       = {Zhang, Zhen and Ko, Che Ming},

  abstractNote = {Based on the phase-space distributions of freeze-out nucleons and Λ hyperons from a blast-wave model, we study hypertriton production in the coalescence model. Including both the coalescence of Λ with proton and neutron as well as with deuteron, which is itself formed from the coalescence of proton and neutron, we study how the production of hypertriton is affected if nucleons and deuterons are allowed to stream freely after freeze-out. Using central Pb+Pb collisions at sNN=2.76 as an example, we find that this only reduces slightly the hypertriton yield, which has a value consistent with the experimental data, even if the volume of the system has expanded to a size similar to the freeze-out volume for a hyertriton if its dissociation cross section by pions in the system is given by its geometric size. Our results thus suggest that the hypertriton yield in relativistic heavy ion collisions is essentially determined at the time when nucleons and deuterons freeze out, although it still undergoes reactions with pions.},

  doi          = {10.1016/j.physletb.2018.03.003},

  journal      = {Physics Letters B},

  number       = ,

  volume       = 780,

  place        = {United States},

  year         = {2018},

  month        = {3}

}

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Journal Article:

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Accepted Manuscript (DOE)

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DOI: 10.1016/j.physletb.2018.03.003

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Figures / Tables:

Fig. 1: Density distributions of proton or neutron (N) and Λ in hypertriton as functions of the distance r from the center-of-mass of proton and neutron. Black dashed lines are theoretical results from Ref. [15], and red solid lines show results obtained from the wave functions used in this work.

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