Since 2015, with the restart of the LHC for its second run of data taking, the LHCb experiment has been empowered with a dedicated computing model to select and analyse calibration samples to measure ...the performance of the particle identification (PID) detectors and algorithms. The novel technique was developed within the framework of the innovative trigger model of the LHCb experiment, which relies on online event reconstruction for most of the datasets, reserving offline reconstruction to special physics cases. The strategy to select and process the calibration samples, which includes a dedicated data-processing scheme combining online and offline reconstruction, is discussed. The use of the calibration samples to measure the detector PID performance, and the efficiency of PID requirements across a large range of decay channels, is described. Applications of the calibration samples in data-quality monitoring and validation procedures are also detailed.
The charmless three-body decays B(s)0 → KS0h+h′ − (where h(′) = π, K) are analysed using a sample of pp collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 ...fb−1. The branching fractions are measured relative to that of the B0 → KS0π+π− decay, and are determined to be:ℬB0→KS0K±π∓ℬB0→KS0K+π−=0.123±0.009stat±0.015syst,ℬB0→KS0K+K−ℬB0→KS0π+π−=0.549±0.018stat±0.033syst,ℬBs0→KS0π+π−ℬB0→KS0π+π−=0.191±0.027stat±0.031syst±0.011fs/fd,ℬBs0→KS0K±π∓ℬB0→KS0π+π−=1.70±0.07stat±0.11syst±0.10fs/fd,ℬBs0→KS0K+K−ℬB0→KS0π+π−∈0.008−0.051at90%confidencelevel,where fs/fd represents the ratio of hadronisation fractions of the Bs0 and B0 mesons.
Asymmetries in the time-dependent rates of \(D^0 \to K^+K^-\) and \(D^0 \to \pi^+\pi^-\) decays are measured in a \(pp\) collision data sample collected with the LHCb detector during LHC Run 1, ...corresponding to an integrated luminosity of \(3\,\mathrm{fb}^{-1}\). The asymmetries in effective decay widths between \(D^0\) and \(\overline{D}^0\) decays, sensitive to indirect \(CP\) violation, are measured to be \(A_\Gamma(K^+ K^-) = (-0.30 \pm 0.32 \pm 0.10)\times 10^{-3}\) and \(A_\Gamma(\pi^+\pi^-) = (0.46 \pm 0.58 \pm 0.12)\times 10^{-3}\), where the first uncertainty is statistical and the second systematic. These measurements show no evidence for \(C\!P\) violation and improve on the precision of the previous best measurements by nearly a factor of two.
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