Measurements of mass and Λ binding energy of <math altimg='si4.svg'><msubsup><mrow /><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup></math>H and <math altimg='si4.svg'><msubsup><mrow /><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup></math>He in Au+Au collisions at <math altimg='si5.svg'><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi mathvariant='normal'>NN</mi></mrow></msub></mrow></msqrt><mo linebreak='goodbreak' linebreakstyle='after'>=</mo><mn>3</mn></math> GeV are presented, with an aim to address the charge symmetry breaking (CSB) problem in hypernuclei systems with atomic number <italic>A</italic> = 4. The &#923; binding energies are measured to be <math altimg='si6.svg'><mn>2.22</mn><mo>&#177;</mo><mn>0.06</mn></math>(stat.)&#177;0.14(syst.) MeV and <math altimg='si7.svg'><mn>2.38</mn><mo>&#177;</mo><mn>0.13</mn></math>(stat.)&#177;0.12(syst.) MeV for <math altimg='si4.svg'><msubsup><mrow /><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup></math>H and <math altimg='si4.svg'><msubsup><mrow /><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup></math>He, respectively. The measured &#923; binding-energy difference is <math altimg='si8.svg'><mn>0.16</mn><mo>&#177;</mo><mn>0.14</mn><mo stretchy='false'>(</mo><mtext>stat</mtext><mo>.</mo><mo stretchy='false'>)</mo><mo>&#177;</mo><mn>0.10</mn><mo stretchy='false'>(</mo><mtext>syst</mtext><mo>.</mo><mo stretchy='false'>)</mo></math> MeV for ground states. Combined with the <italic>&#947;</italic>-ray transition energies, the binding-energy difference for excited states is <math altimg='si9.svg'><mo linebreak='badbreak' linebreakstyle='after'>&#8722;</mo><mn>0.16</mn><mo>&#177;</mo><mn>0.14</mn><mo stretchy='false'>(</mo><mtext>stat</mtext><mo>.</mo><mo stretchy='false'>)</mo><mo>&#177;</mo><mn>0.10</mn><mo stretchy='false'>(</mo><mtext>syst</mtext><mo>.</mo><mo stretchy='false'>)</mo></math> MeV, which is negative and comparable to the value of the ground states within uncertainties. These new measurements on the &#923; binding-energy difference in A = 4 hypernuclei systems are consistent with the theoretical calculations that result in <math altimg='si10.svg'><mi mathvariant='normal'>&#916;</mi><msubsup><mrow><mi mathvariant='normal'>B</mi></mrow><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup><mo stretchy='false'>(</mo><msubsup><mrow><mn>1</mn></mrow><mrow><mtext>exc</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup><mo stretchy='false'>)</mo><mo>&#8776;</mo><mo linebreak='goodbreak' linebreakstyle='after'>&#8722;</mo><mi mathvariant='normal'>&#916;</mi><msubsup><mrow><mtext>B</mtext></mrow><mrow><mi mathvariant='normal'>&#923;</mi></mrow><mrow><mn>4</mn></mrow></msubsup><mo stretchy='false'>(</mo><msubsup><mrow><mn>0</mn></mrow><mrow><mtext>g.s.</mtext></mrow><mrow><mo linebreak='badbreak' linebreakstyle='after'>+</mo></mrow></msubsup><mo stretchy='false'>)</mo><mo linebreak='goodbreak' linebreakstyle='after'>&lt;</mo><mn>0</mn></math> and present a new method for the study of CSB effect using relativistic heavy-ion collisions.

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Measurement of <math altimg='si1.svg'><mmultiscripts><mrow><mi mathvariant='normal'>H</mi></mrow><mprescripts /><mrow><mi mathvariant='normal'>&#923;</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'>&#923;</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