在 $\sqrt{s_{NN}}=110$ GeV 的 pHe 碰撞中测量反超子衰变产生的反质子
Measurement of antiproton production from antihyperon decays in pHe collisions at $\sqrt{s_{NN}}=110$ GeV
AI总结：
该研究利用 LHCb 实验 6.5 TeV 质子与氦核碰撞数据，测量了反超子衰变与直接产生的反质子比例，发现反超子贡献显著大于常用模型预测。
摘要：
对空间实验中宇宙反质子流测量的解释，目前受限于对初级宇宙射线与星际介质碰撞中反质子产生截面的了解。利用在 LHCb 实验相互作用区附近、能量为 6.5 TeV 的质子轰击静止氦核的碰撞，测量了反质子动量在 12 至 110 GeV/c 之间，源自反超子衰变的反质子与直接产生的反质子之比。同时专门测量了主要的反超子贡献，即来自直接产生的 $\barΛ$ 粒子的 $\barΛ \to \bar{p} π^+$ 衰变。这些结果补充了从同一数据样本获得的直接反质子产生测量。在本次测量的能量尺度下，观察到反超子对反质子产生的贡献显著大于常用强子产生模型的预测。
英文摘要：
The interpretation of cosmic antiproton flux measurements from space-borne experiments is currently limited by the knowledge of the antiproton production cross-section in collisions between primary cosmic rays and the interstellar medium. Using collisions of protons with an energy of 6.5 TeV incident on helium nuclei at rest in the proximity of the interaction region of the LHCb experiment, the ratio of antiprotons originating from antihyperon decays to prompt production is measured for antiproton momenta between 12 and 110 GeV/c. The dominant antihyperon contribution, namely $\barΛ \to \bar{p} π^+$ decays from promptly produced $\barΛ$ particles, is also exclusively measured. The results complement the measurement of prompt antiproton production obtained from the same data sample. At the energy scale of this measurement, the antihyperon contributions to antiproton production are observed to be significantly larger than predictions of commonly used hadronic production models.
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