论文标题
$^{3}_λ\ mathrm h $的生命周期和$λ$分离能量的测量
Measurement of the lifetime and $Λ$ separation energy of $^{3}_Λ\mathrm H$
论文作者
论文摘要
$^{3}_λ\ Mathrm H $ h $ lifetime $τ$和$λ$分离能量$ {\ rm b}_λ$的最精确测量是使用$ \ sqrt {s _ {s _ {\ mathrm {nnnnn} al的PB-PB碰撞数据来获得的。 $^{3}_λ\ Mathrm H $是通过其带电的两体中性衰减通道（$^{3}_λ\ Mathrm {h} \ rightArrow $ $ $ $ $ $ HE + HE + $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $和电荷连接过程）进行重建。测得的值$τ= [253 \ pm 11 \ text {（stat。）} \ pm 6 \ pm 6 \ text {（syst。）}] $ ps和$ {\ rm b}_λ= [102 \ pm 63 \ pm 63 \ pm 63 \ pm 63 \ text。 $^{3}_λ\ Mathrm H $结构与弱限制的系统一致。
The most precise measurements to date of the $^{3}_Λ\mathrm H$ lifetime $τ$ and $Λ$ separation energy ${\rm B}_Λ$ are obtained using the data sample of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV collected by ALICE at the LHC. The $^{3}_Λ\mathrm H$ is reconstructed via its charged two-body mesonic decay channel ($^{3}_Λ\mathrm{H} \rightarrow$ $^3$He + $π^-$ and the charge-conjugate process). The measured values $τ= [253 \pm 11 \text{ (stat.)} \pm 6 \text{ (syst.)}]$ ps and ${\rm B}_Λ= [102 \pm 63 \text{ (stat.)} \pm 67 \text{ (syst.)}]$ keV are compatible with predictions from effective field theories and confirm that the $^{3}_Λ\mathrm H$ structure is consistent with a weakly-bound system.
