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arXiv 2501.02839hep-ph
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在过程 $B^+\ o D^{*-}D_s^+π^+$ 中存在开味四夸克态 $T_{c\ar{s}2}$ 的证据

Evidence of the open-flavor tetraquark $T_{c\bar{s}2}$ in the process $B^+\to D^{*-}D_s^+π^+$

Wen-Tao Lyu, Li-Juan Liu, En Wang

AI总结:

本文通过分析 LHCb 的 $B^+\ o D^{*-}D_s^+π^+$ 过程,发现 $D_s^+π^+$ 不变质量分布在 2830 MeV 附近的类共振结构,并提出利用角质量分布矩来确认 $T_{c\ar{s}2}$ 四夸克态的存在。

摘要:

新观测到的开味四夸克态 $T_{c\ar{s}0}(2900)$ 已引起广泛关注,寻找其自旋伙伴对于探索这些态的内部结构至关重要。在本工作中,我们将展示,LHCb 测量的过程 $B^+\ o D^{*-}D_s^+π^+$ 的 $D_s^+π^+$ 不变质量分布在约 2830 MeV 处具有类共振结构,这可能与预言中的 $T_{c\ar{s}2}$ 相关联,即 $T_{c\ar{s}0}(2900)$ 的自旋 $J=2$ 伙伴。此外,我们计算了角质量分布的矩,这些矩在不同的自旋假设下差异很大,并且在共振能量处具有比角积分质量分布中所见峰值更大的强度。我们呼吁实验上测定这些量,它们可用于确定 $T_{c\ar{s}2}$ 的存在。

英文摘要:

The newly observed open-flavor tetraquark $T_{c\bar{s}0}(2900)$ has attracted many attentions, and searching for its spin partners is crucial to exploring the internal structure of those states. In this work, we will show that, the $D_s^+π^+$ invariant mass distribution of the process $B^+\to D^{*-}D_s^+π^+$ measured by LHCb has a resonant-like structure around 2830~MeV, which could be associated with the predicted $T_{c\bar{s}2}$, the spin $J=2$ partner of $T_{c\bar{s}0}(2900)$. Furthermore, we have evaluated the momenta of the angular mass distribution, which are very different for each of the spin assumptions, and have larger strength at the resonant energy than the peaks seen in the angular integrated mass distribution. We make a call for the experimental determination of these magnitudes, which could be used to pin down the existence of the $T_{c\bar{s}2}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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