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arXiv 2006.04824hep-phhep-ex
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$B$介子混合中的新物理:未来的灵敏度和局限性

New physics in $B$ meson mixing: future sensitivity and limitations

J. Charles, S. Descotes-Genon, Z. Ligeti, S. Monteil, M. Papucci, K. Trabelsi, L. Vale Silva

摘要:

中性介子的混合对实验室实验中探测到的一些最高尺度很敏感。鉴于计划中的LHCb升级II,Belle II的可能升级,以及在拟议的FCC-ee计划的tera- $Z$阶段对风味物理学的广泛兴趣,我们研究了在这些基准场景中可以获得的对$B_d$和$B_s$混合的新物理贡献的约束。我们探讨了该计划的局限性,并确定了测量的$|V_{cb}|$的关键成分之一,其中超过目前的预期进展是必要的,以最大限度地提高未来的敏感性。我们推测这个瓶颈的可能解决方案。鉴于目前的紧张局势与标准模型(SM)在半轻子$B$衰变,我们探讨它的分辨率可能会影响寻找新的物理混合。即使新物理具有与SM相同的CKM和味道变化过程的回路供应,灵敏度也将达到2 TeV,并且如果任何SM供应被提升,则灵敏度可以高得多。我们说明了这个程序的发现潜力。

英文摘要:

The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, and the broad interest in flavor physics in the tera-$Z$ phase of the proposed FCC-ee program, we study constraints on new physics contributions to $B_d$ and $B_s$ mixings which can be obtained in these benchmark scenarios. We explore the limitations of this program, and identify the measurement of $|V_{cb}|$ as one of the key ingredients in which progress beyond current expectations is necessary to maximize future sensitivity. We speculate on possible solutions to this bottleneck. Given the current tension with the standard model (SM) in semileptonic $B$ decays, we explore how its resolution may impact the search for new physics in mixing. Even if new physics has the same CKM and loop suppressions of flavor changing processes as the SM, the sensitivity will reach 2 TeV, and it can be much higher if any SM suppressions are lifted. We illustrate the discovery potential of this program.

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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