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arXiv 1911.05018hep-ph
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探测$B_q \to μ^+μ^-$尾部的味轴子

Probing flavoured Axions in the Tail of $B_q \to μ^+μ^-$

Johannes Albrecht, Emmanuel Stamou, Robert Ziegler, Roman Zwicky

备注：
37 pages, 6 figures, version to appear in JHEP, added multiple subtracted dispersion relation to extend in resonance region including ancillary Mathematica notebook with Form Factors
发表信息：
J. High Energ. Phys. 2021, 139 (2021)
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摘要：

我们讨论了如何收集的LHC双μ子数据研究$B_q \to μμ$可以用来约束轻粒子的味道违反耦合$b$ -夸克。我们以味QCD轴子$a$为例，计算了运动学端点附近的$B_q \to μμa$和SM背景过程$B_q \to μμγ$的衰变率.这些速率取决于具有壳层上或壳层外光子的非微扰$B_q \to γ^{(*)}$形状因子。壳外的形状因子-相关的通用搜索超越SM粒子-在充分的一般性讨论和计算QCD求和规则的第一次。根据这些结果，我们分析了现有的LHCb数据，以获得当前和未来运行中对$B_q \to μμa$的灵敏度。我们发现，完整的LHCb数据集单独将允许探测轴子耦合尺度的顺序$10^6$ GeV的$b\to d$和$b \to s$过渡。

英文摘要：

We discuss how LHC di-muon data collected to study $B_q \to μμ$ can be used to constrain light particles with flavour-violating couplings to $b$-quarks. Focussing on the case of a flavoured QCD axion, $a$, we compute the decay rates for $B_q \to μμa$ and the SM background process $B_q \to μμγ$ near the kinematic endpoint. These rates depend on non-perturbative $B_q \to γ^{(*)}$ form factors with on- or off-shell photons. The off-shell form factors -- relevant for generic searches for beyond-the-SM particles -- are discussed in full generality and computed with QCD sum rules for the first time. With these results, we analyse available LHCb data to obtain the sensitivity on $B_q \to μμa$ at present and future runs. We find that the full LHCb dataset alone will allow to probe axion-coupling scales of the order of $10^6$ GeV for both $b\to d$ and $b \to s$ transitions.

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