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Title: Observation of Directed Flow of Hypernuclei $$^3_Λ\text{H}$$ and $$^4_Λ\text{H}$$ in $$\sqrt{s_{\text{NN}}}$$ = 3 GeV Au + Au Collisions at RHIC

Journal Article · · Physical Review Letters
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We report here the first observation of directed flow ($$v_1$$) of the hypernuclei $$^3_Λ\text{H}$$ and $$^4_Λ\text{H}$$ in mid-central Au + Au collisions at $$\sqrt{s_{\text{NN}}}$$ = 3 GeV at RHIC. These data are taken as part of the beam energy scan program carried out by the STAR experiment. From 165 × 106 events in 5%–40% centrality, about 8400 $$^3_Λ\text{H}$$ and 5200 $$^4_Λ\text{H}$$ candidates are reconstructed through two- and three-body decay channels. In this work, we observe that these hypernuclei exhibit significant directed flow. Comparing to that of light nuclei, it is found that the midrapidity $$v_1$$ slopes of $$^3_Λ\text{H}$$ and $$^4_Λ\text{H}$$ follow baryon number scaling, implying that the coalescence is the dominant mechanism for these hypernuclei production in the 3 GeV Au + Au collisions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; SC0017982
OSTI ID:
1901747
Alternate ID(s):
OSTI ID: 2222662
Report Number(s):
BNL-223754-2022-JAAM; TRN: US2311121
Journal Information:
Physical Review Letters, Vol. 130, Issue 21; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (50)

Yield ratio of hypertriton to light nuclei in heavy-ion collisions from = 4.9 GeV to 2.76 TeV * journal November 2020
Spectroscopy of Λ hypernuclei journal October 2006
Beam-Energy Dependence of Directed Flow of Λ , Λ ¯ , K ± , K s 0 , and ϕ in Au + Au Collisions journal February 2018
Examination of directed flow as a signal for a phase transition in relativistic nuclear collisions journal May 2014
Disappearance of partonic collectivity in s NN = 3 GeV Au+Au collisions at RHIC journal April 2022
Experiments with the High Resolution Kaon Spectrometer at JLab Hall C and the new spectroscopy of Λ 12 B hypernuclei journal September 2014
Antinuclei in heavy-ion collisions journal October 2018
Parton-hadron-quantum-molecular dynamics: A novel microscopic n -body transport approach for heavy-ion collisions, dynamical cluster formation, and hypernuclei production journal April 2020
Beam-energy dependence of the directed flow of deuterons in Au+Au collisions journal October 2020
The STAR event plane detector
  • Adams, J.; Ewigleben, A.; Garrett, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 968 https://doi.org/10.1016/j.nima.2020.163970
journal July 2020
Flow and interferometry results from Au + Au collisions at s N N = 4.5 GeV journal March 2021
Probing chemical freeze-out criteria in relativistic nuclear collisions with coarse grained transport simulations journal October 2020
Measurement of the differential cross sections of the Σ−p elastic scattering in momentum range 470 to 850 MeV/c journal October 2021
Strangeness in nuclear physics journal August 2016
Relativistic nuclear collisions at 1 0 A GeV energies from p + Be to Au+Au with the hadronic cascade model journal December 1999
Hypernuclei, dibaryon and antinuclei production in high energy heavy ion collisions: Thermal production vs. coalescence journal July 2012
Sideward Flow in A u + A u Collisions between 2 A and 8 A GeV journal June 2000
Antiflow of nucleons at the softest point of the equation of state journal January 2000
Lambda-Proton Correlations in Relativistic Heavy Ion Collisions journal October 1999
Measurement of the H Λ 3 lifetime in Au+Au collisions at the BNL Relativistic Heavy Ion Collider journal May 2018
Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton journal March 2020
Beam-Energy Dependence of the Directed Flow of Protons, Antiprotons, and Pions in Au+Au Collisions journal April 2014
Exploring the Λ -deuteron interaction via correlations in heavy-ion collisions journal September 2020
Light nuclei collectivity from sNN=3 GeV Au+Au collisions at RHIC journal April 2022
Event plane resolution correction for azimuthal anisotropy in wide centrality bins
  • Masui, Hiroshi; Schmah, Alexander; Poskanzer, A. M.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 833 https://doi.org/10.1016/j.nima.2016.07.037
journal October 2016
Precise Measurement of Differential Cross Sections of the Σ−p→Λn Reaction in Momentum Range 470–650  MeV/c journal February 2022
Observation of an Antimatter Hypernucleus journal March 2010
Identified particle production, azimuthal anisotropy, and interferometry measurements in Au + Au collisions at s NN = 9 . 2 GeV journal February 2010
Multigap RPCs in the STAR experiment at RHIC journal January 2012
Production of light nuclei, hypernuclei and their antiparticles in relativistic nuclear collisions journal March 2011
Improved Λp Elastic Scattering Cross Sections between 0.9 and 2.0  GeV/c as a Main Ingredient of the Neutron Star Equation of State journal December 2021
Hyperon–nucleon three-body forces and strangeness in neutron stars journal June 2020
The STAR time projection chamber: a unique tool for studying high multiplicity events at RHIC
  • Anderson, M.; Berkovitz, J.; Betts, W.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 499, Issue 2-3 https://doi.org/10.1016/S0168-9002(02)01964-2
journal March 2003
Towards solving the puzzle of high temperature light (anti)-nuclei production in ultra-relativistic heavy ion collisions journal April 2022
Examination of directed flow as a signature of the softest point of the equation of state in QCD matter journal September 2016
Event Topology Reconstruction in the CBM Experiment journal August 2018
Formation of hypermatter and hypernuclei within transport models in relativistic ion collisions journal March 2015
Elliptic flow of identified hadrons in Au+Au collisions at s NN = 7.7 –62.4 GeV journal July 2013
Strange hadron production in Au + Au collisions at s N N = 7.7 , 11.5, 19.6, 27, and 39 GeV journal September 2020
Maximum freeze-out baryon density in nuclear collisions journal October 2006
Hyperon Puzzle: Hints from Quantum Monte Carlo Calculations journal March 2015
Glauber Modeling in High-Energy Nuclear Collisions journal November 2007
Formation of hypernuclei in heavy-ion collisions around the threshold energies journal January 2017
The Beam-Beam Counter: A Local Polarimeter at STAR conference January 2008
Comparison of chemical freeze-out criteria in heavy-ion collisions journal March 2006
H Λ 3 and H ‾ Λ ‾ 3 lifetime measurement in Pb–Pb collisions at s NN = 5.02  TeV via two-body decay journal October 2019
New directions in hypernuclear physics journal September 2021
Measurements of HΛ3 and HΛ4 Lifetimes and Yields in Au+Au Collisions in the High Baryon Density Region journal May 2022
Hydrodynamics near the QCD Phase Transition: Looking for the Longest-Lived Fireball journal November 1995
Mapping the phases of quantum chromodynamics with beam energy scan journal April 2020