Abstract
Measurements of the branching fractions of and decays are performed using a data sample corresponding to of proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of , where the mesons are reconstructed in the final state. The first observation of the decay and the first evidence for the decay are reported with branching fractions B B s 0 → K * ± K ∓ = 12.7 ± 1.9 ± 1.9 × 10 − 6 , B B s 0 → K * - &pgr; + = 3.3 ± 1.1 ± 0.5 × 10 − 6 , ?>where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of is set at confidence level.
Highlights
The Standard Model (SM) of particle physics predicts that all manifestations of CP violation, i.e. violation of symmetry under the combined charge conjugation and parity operation, arise due to the single complex phase that appears in the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix [1, 2]
Baryon asymmetry of the Universe [3], one of the key goals of contemporary particle physics is to search for signatures of CP violation that are not consistent with the CKM paradigm
The phase differences between the two amplitudes can lead to CP violation and, since particles hypothesized in extensions to the SM may affect the loop diagrams, deviations from the SM predictions may occur
Summary
The Standard Model (SM) of particle physics predicts that all manifestations of CP violation, i.e. violation of symmetry under the combined charge conjugation and parity operation, arise due to the single complex phase that appears in the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix [1, 2]. The phases can only be obtained from Dalitz plot analyses of B meson decays to final states containing one kaon and two pions, the magnitudes can be obtained from simplified approaches. The fit used to distinguish signal from background is an unbinned maximum likelihood fit in the two dimensions of B candidate and K* candidate invariant masses This approach allows the resonant B → K*±h∓ decay to be separated from other B meson decays to the KS0 π±h∓ final state. It does not, account for interference effects between the K*±h∓ component and other amplitudes contributing to the Dalitz plot; possible biases due to interference are considered as a source of systematic uncertainty
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