Measurement of <math altimg="si1.svg"><mmultiscripts><mrow><mi mathvariant="normal">H</mi></mrow><mprescripts/><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow><mn>4</mn></mrow></mmultiscripts></math> and <math altimg="si2.svg"><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts/><mrow><mi mathvariant="normal">Λ</mi></mrow><mrow><mn>4</mn></mrow></mmultiscripts></math> binding energy in Au+Au collisions at <math altimg="si3.svg"><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi mathvariant="normal">NN</mi></mrow></msub></mrow></msqrt></math> = 3 GeV - INSPIRE

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Measurement of ${}_{Λ}^{4}H$ and ${}_{Λ}^{4}{He}$ binding energy in Au+Au collisions at $\sqrt{s_{NN}}$ = 3 GeV

STAR

Collaboration

Jul 2, 2022

8 pages

Published in:

Phys.Lett.B 834 (2022) 137449

Published: Sep 17, 2022
and
Published: Nov 10, 2022

e-Print:

2207.00778 [nucl-ex]

DOI:

10.1016/j.physletb.2022.137449 (publication)

Experiments:

BNL-RHIC-STAR

View in:

reference search11 citations

Citations per year

Abstract: (Elsevier B.V.)

Measurements of mass and Λ binding energy of

_{Λ}^{4}

H and

_{Λ}^{4}

He in Au+Au collisions at

\sqrt{s_{NN}} = 3

GeV are presented, with an aim to address the charge symmetry breaking (CSB) problem in hypernuclei systems with atomic number A = 4. The Λ binding energies are measured to be

2.22 \pm 0.06

(stat.)±0.14(syst.) MeV and

2.38 \pm 0.13

(stat.)±0.12(syst.) MeV for

_{Λ}^{4}

H and

_{Λ}^{4}

He, respectively. The measured Λ binding-energy difference is

0.16 \pm 0.14 (stat .) \pm 0.10 (syst .)

MeV for ground states. Combined with the γ-ray transition energies, the binding-energy difference for excited states is

- 0.16 \pm 0.14 (stat .) \pm 0.10 (syst .)

MeV, which is negative and comparable to the value of the ground states within uncertainties. These new measurements on the Λ binding-energy difference in A = 4 hypernuclei systems are consistent with the theoretical calculations that result in

Δ B_{Λ}^{4} (1_{exc}^{+}) \approx - Δ B_{Λ}^{4} (0_{g.s.}^{+}) < 0

and present a new method for the study of CSB effect using relativistic heavy-ion collisions.

Note:

8 pages, 5 figures

binding energy: difference
charge: symmetry breaking
energy: transition
heavy ion: scattering
ground state
hypernucleus
gamma ray
GeV
mass number
excited state

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