论文标题
全球适合$ b \ tocτν$异常2022年中期
Global fit to $b \to cτν$ anomalies 2022 mid-autumn
论文作者
论文摘要
最近，LHCB合作宣布了Lepton风味普遍性（LFU）的初步结果$ r_ {d^{\ ast}}}^{\ rm lhcb2022} = 0.281 \ pm 0.030 $，基于LHC运行1个数据。这是LHCB实验的$ r_ {d} $的第一个结果，其精度与其他$ b $ -FACTORCY数据相当。有趣的是，这些数据更喜欢再次违反LFU。来自Babar，Belle和LHCB合作的新世界平均值为$ R_ {D} = 0.358 \ pm 0.027 $和$ R_ {D^{\ ast}} = 0.285 \ pm 0.013 $。包括这些新数据，我们将$ b \的情况更新为cτ\overlineν$测量及其对新物理学的影响。在标准模型（SM）中纳入了$ b \ to d^{（\ ast）} $形式的最新发展，我们观察到$ 4.1σ$偏离SM预测。我们的更新还包括：与模型无关的新物理学（NP）公式用于相关可观察物；以及leptoquark方案的参数以及单个NP操作员方案的全局配件。此外，我们通过使用$ b \ to d^{（\ ast）}τ\overlineν$在Belle II和High-$ P_ {flump _ {\ rm t} $味道搜索搜索的seaches ot lhc a lhc seardes seardes of $ b \ to $ b \ to d^{（\ ast）}τ\overlineν$间接地区分不同的新物理场景的潜力。我们还讨论了对$υ\ in l^+ l^ - $的违规行为的影响。
Recently, the LHCb collaboration announced a preliminary result of the test of lepton flavor universality (LFU) in $B\to D^{(\ast)}$ semi-leptonic decays: $R_{D}^{\rm LHCb2022} = 0.441 \pm 0.089$ and $R_{D^{\ast}}^{\rm LHCb2022} = 0.281 \pm 0.030$ based on the LHC Run 1 data. This is the first result of $R_{D}$ for the LHCb experiment, and its precision is comparable to the other $B$-factory data. Interestingly, those data prefer the violation of the LFU again. A new world average of the data from the BaBar, Belle, and LHCb collaborations is $R_{D} = 0.358 \pm 0.027$ and $R_{D^{\ast}} = 0.285 \pm 0.013$. Including this new data, we update a circumstance of the $b \to c τ\overlineν$ measurements and their implications for new physics. Incorporating recent developments for the $B \to D^{(\ast)}$ form factors in the Standard Model (SM), we observe a $4.1 σ$ deviation from the SM predictions. Our updates also include; model-independent new physics (NP) formulae for the related observables; and the global fittings of parameters for leptoquark scenarios as well as single NP operator scenarios. Furthermore, we show future potential to indirectly distinguish different new physics scenarios with the use of the precise measurements of the polarization observables in $B\to D^{(\ast)}τ\overlineν$ at the Belle II and the high-$p_{\rm T}$ flavored-tail searches at the LHC. We also discuss an impact on the LFU violation in $Υ\to l^+ l^-$.
