Abstract
A measurement of CP violation in the decay B^{+}→K^{+}π^{0} is reported using data corresponding to an integrated luminosity of 5.4 fb^{-1} collected with the LHCb experiment at a center-of-mass energy of sqrt[s]=13 TeV. The CP asymmetry is measured to be 0.025±0.015±0.006±0.003, where the uncertainties are statistical, systematic, and due to an external input. This is the most precise measurement of this quantity. It confirms and significantly enhances the observed anomalous difference between the direct CP asymmetries of the B^{0}→K^{+}π^{-} and B^{+}→K^{+}π^{0} decays, known as the Kπ puzzle.
Highlights
A measurement of CP violation in the decay Bþ → Kþπ0 is reported using data corresponding to an pintffiffiegrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of s 1⁄4 13 TeV
Rare decays of heavy flavored hadrons that primarily proceed through loop-level transitions are powerful probes of the effects of new physics (NP) beyond the Standard Model (SM)
Studies of the decay B0 → Kþπ− at the B-factory experiments led to the first observation of direct CP violating asymmetries in the B system [5,6] resulting from the interference of two decay amplitudes where both the relative strong and weak phases are nonzero
Summary
A measurement of CP violation in the decay Bþ → Kþπ0 is reported using data corresponding to an pintffiffiegrated luminosity of 5.4 fb−1 collected with the LHCb experiment at a center-of-mass energy of s 1⁄4 13 TeV. Two pairs of BDTs are trained and tested using data to represent background and simulated Bþ → Kþπ0 decays, corrected as described above, to represent signal.
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