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arXiv 2004.14687hep-phhep-ex
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复Wilson系数$b\to s \ell\ell$衰变的新物理

New physics in $b\to s \ell\ell$ decays with complex Wilson coefficients

Aritra Biswas, Soumitra Nandi, Ipsita Ray, Sunando Kumar Patra

摘要:

我们进行了一个数据驱动的分析,新的物理(NP)在排他性的$b \to s \ell^+\ell^-$衰变的模型无关的有效理论方法与维度6运营商考虑标量,伪标量,矢量和轴矢量运营商与相应的威尔逊系数(WC)采取复杂的。分析是用最新的数据进行的,同时将结果与相对较旧的数据集进行比较。我们发现,一个左手夸克流矢量μ子耦合是唯一的一个运营商$(\mathcal{O}_9)$的情况下,可以解释的数据,在这两种情况下,真正的和复杂的WC与一个大的非零虚贡献。我们同时应用模型选择工具,如交叉验证和信息理论方法,如赤池信息准则(AIC),以找出运营商或运营商的集合,可以最好地解释在这个通道中的可用数据。具有复杂WC的$\mathcal{O}_9$是唯一通过测试的单操作员场景。然而,有一些两个和三个运营商的场景(具有真实或复杂的WC)通过了测试,运营商$\mathcal{O}_9$在其中很常见。

英文摘要:

We perform a data-driven analysis of new physics (NP) effects in exclusive $b \to s \ell^+\ell^-$ decays in a model-independent effective theory approach with dimension six operators considering scalar, pseudo-scalar, vector and axial-vector operators with the corresponding Wilson coefficients (WC) taken to be complex. The analysis has been done with the most recent data while comparing the outcome with that from the relatively old data-set. We find that a left-handed quark current with vector muon coupling is the only one-operator $(\mathcal{O}_9)$ scenario that can explain the data in both the cases with real and complex WC with a large non-zero imaginary contribution. We simultaneously apply model selection tools like cross-validation and information-theoretic approach like Akaike Information Criterion (AIC) to find out the operator or sets of operators that can best explain the available data in this channel. The $\mathcal{O}_9$ with complex WC is the only one-operator scenario which survives the test. However, there are a few two and three-operator scenarios (with real or complex WCs) which survive the test, and the operator $\mathcal{O}_9$ is common among them.

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