Abstract
A search for CP and P violation using triple-product asymmetries is performed with Λb0 → pK−π+π−, Λb0 → pK−K+K− and Ξb0 → pK−K−π+ decays. The data sample corresponds to integrated luminosities of 1.0 fb−1 and 2.0 fb−1, recorded with the LHCb detector at centre-of-mass energies of 7 TeV and 8 TeV, respectively. The CP - and P - violating asymmetries are measured both integrating over all phase space and in specific phase-space regions. No significant deviation from CP or P symmetry is found. The first observation of Λb0 → pK−χc0(1P)(→π+π−, K+K−) decay is also reported.
Highlights
Two T -odd asymmetries are defined based on the operator T that reverses the spin and the momentum of the particles [7,8,9,10,11,12]
This is tested by measuring the asymmetry aTCP-odd(Λ+c π−) for the Cabibbo-favoured Λ0b → Λ+c π− decay mode, where negligible CP violation is expected
The measured asymmetry is consistent with zero with a statistical uncertainty of 0.31%, which is assigned as a systematic uncertainty for aTCP-odd for the integrated measurement over the full phase space
Summary
The sources of systematic uncertainty and their relative contributions to the total uncertainty are listed in table 3. The measured asymmetry is consistent with zero with a statistical uncertainty of 0.31%, which is assigned as a systematic uncertainty for aTCP-odd for the integrated measurement over the full phase space. The resulting distribution of aTCP-odd is fitted with various models, all of which give results consistent with no asymmetry with a statistical precision of 0.6% This statistical precision is assigned as a systematic uncertainty in each bin of the different binning schemes A, B, C and D. Multiple candidates, and the effect of the trigger and selection criteria The results of these checks are all statistically compatible with the nominal results, and no systematic uncertainty is assigned
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