Zooming in on \(B\rightarrow K^*\ell \ell \) decays at low recoil

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• 作者：Simon Braß ; Gudrun Hiller ; Ivan Nišandžić
• 刊名：The European Physical Journal C
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：77
• 期：1
• 全文大小：1095KB
• 刊物类别：Physics and Astronomy
• 刊物主题：Elementary Particles, Quantum Field Theory; Nuclear Physics, Heavy Ions, Hadrons; Quantum Field Theories, String Theory; Measurement Science and Instrumentation; Astronomy, Astrophysics and Cosmology;
• 出版者：Springer Berlin Heidelberg
• ISSN：1434-6052
• 卷排序：77

文摘

We analyse \(B\rightarrow K^*\ell \ell \) decays in the region of low hadronic recoil, where an operator product expansion (OPE) in \(1/m_b\) applies. Using a local model for charm contributions based on \(e^+ e^- \rightarrow \mathrm{hadrons}\) against the OPE provides a data-driven method to access the limitations to the OPE’s accuracy related to binnings in the dilepton mass. Model-independent fits to \(B\rightarrow K^*\mu \mu \) low recoil angular observables exhibit presently only small sensitivity to different charm models. They give similar results to the fits based on the OPE and are in agreement with the standard model, but leave also room for new physics. Measurements with resolution small enough to probe charm resonances would be desirable.