论文标题
$ b \ do d $流程的模型无关分析
Model-independent analysis of $b\to d$ processes
论文作者
论文摘要
我们对$ |ΔB| = |ΔD| = 1 $过程进行模型无关分析，以测试新物理学的标准模型和探针风味模式。威尔逊系数的约束是从全球拟合到$ b^+\ toπ^+\，μ^+μ^ - $，$ b^0_s \ to \ bar {k}^{*0} \，μ^+μ^ - $^+μ^ - $ b^0 \ b^toμ^+μ^$ $ b \ d to数据拟合与标准型号一致，但为新物理学留下了很大的空间。除了更高统计的测量和dilepton群众理论友好的垃圾箱中的更多数据外，其他互补的观察值，例如$ b_s^0 \ to \ bar {k}^{*0} \，\ ell^+ el^+ el^ell^ell^ell^ell^ - $ b \ $ b \ $ b \ to p \ eeld^el^el^el^el^el^el^ - 或σ\，\ ell^+ \ ell^ - $，$ω_b^ - \ t toξ^ - \，\ ell^+ \ ell^ - $对于解决适合半衰弱的四屈光度操作员的重大退化是必要的。假设违反夸克风味的情况很小，$ b \ to s $ Global Fit意味着对$ b \ to d $耦合的严格限制，因此可以通过改进的数据测试此范式。 $ |ΔB| = |δd| = 1 $过程的另一个好处是，从新角度来看$ b $ - $ |ΔB| = |ΔS| = 1 $模式。具体而言，对Lepton风味特异性和Dineutrino模式的研究对Lepton风味结构具有丰富的信息。可以在高亮度风味设施LHCB，Belle II和未来的$ Z $ -Factory中研究稀有的$ b \ to d \ to d \ to d \ to d \ to d \ to d \ to d \barν$衰减。
We perform a model-independent analysis of $|Δb|=|Δd|=1$ processes to test the standard model and probe flavor patterns of new physics. Constraints on Wilson coefficients are obtained from global fits to $B^+ \to π^+ \,μ^+μ^-$, $B^0_s\to \bar{K}^{*0}\, μ^+μ^-$, $B^0\toμ^+μ^-$, and radiative $B \to X_d \,γ$ decays data. The fits are consistent with the standard model but leave sizable room for new physics. Besides higher-statistics measurements and more data in theory-friendly bins of the dilepton mass, further complementary observables such as angular distributions of $B_s^0 \to \bar{K}^{*0}\,\ell^+ \ell^-$, $B \to ρ\,\ell^+ \ell^-$ or the baryonic modes $Ξ_b \to Σ\,\ell^+ \ell^-$, $Ω_b^- \to Ξ^- \, \ell^+ \ell^-$ are necessary to resolve the significant degeneracy in the fit for the semileptonic four-fermion operators. Assuming minimal quark flavor violation, the $b \to s$ global fit implies tight constraints on the $b \to d$ couplings, and hence allows to test this paradigm with improved data. Another benefit from $|Δb|=|Δd|=1$ processes is to shed light on the $B$-anomalies in $|Δb|=|Δs|=1$ modes from a new angle. Specifically, studies of lepton flavor-specific and dineutrino modes are informative on the lepton flavor structure. Rare $b \to d \, \ell \ell, ν\bar ν$ decays can be studied at high luminosity flavor facilities LHCb, Belle II, and a future $Z$-factory.
