This webpage collects the links to the CDF public note and to the
relevant supporting plots for the measurement of the measurements
of A_{CP} (B^{0}_{(s)}->hh') and A_{CP}(Λ^{0}_{b}->ph)
These preliminary results were approved on June 28^{th}, 2012 by the CDF collaboration.

However, additional sources of CP violation are required to explain the matter-antimatter asymmetry of the Universe in standard big-bang cosmology. This would have profound consequences on our understanding of fundamental interactions.

Violation of CP is direct if the partial decay-width of a particle into a final state differs from the width of the corresponding antiparticle into the CP-conjugate final state. In recent times, the pattern of direct CP violation in charmless mesonic decays of B mesons has shown some unanticipated discrepancies from expectations. Under standard assumptions of isospin symmetry and smallness of contributions from higher-order processes, similar CP asymmetries are predicted for B

Recently, it has been suggested a way [7] to accommodate this discrepancy within the SM, taking into account only constraints imposed by the Pauli principle. Nevertheless, high accuracy measurements of the violation of CP symmetry in charmless modes remains, therefore, a very interesting subject of study and may provide useful information to our comprehension of this discrepancy.

Rich samples of bottom-flavored hadrons of all types from the Tevatron offer the opportunity to explore new territory in the field of Bs mesons and b-flavored baryons. Additional information coming from different decays yields further constraints on the possible explanations of previous findings, and may possibly reveal new deviations from expectations. Specifically, measurements of direct CP violation in B

The relationships between charged-current quark couplings in the SM predict a well-defined hierarchy between direct CP violation in B

Supplementary information could come from CP\ violation in bottom baryons. Interest in charmless b-baryon decays is prompted by branching fractions recently observed being larger than expected [10]. Asymmetries up to about 10% are predicted for Λ

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A complete description of the analysis is available here: CDF Public note 10726.

We measured:

The measurement of CP violation in the B mesons system is compatible and of comparable accuracy with current results from B-Factories and LHCb.

We report an updated measurement of ACP in Bs->Kpi decays, with a significance of about 3 sigma. This result confirms the LHCb evidence with the same level of resolution.

The measurement of CP violation in the Bs mesons system is in agreement at 2 sigma level with the prediction within the SM [10].

The observed asymmetry in the Λ

- Table: selection pdf
- Table: ACP results pdf
- Table: ACP results with raw yields pdf eps
- Table: systematic uncertainties pdf
- Qualitative Mass only fit eps
- Fit projection onto invariant pipi-mass eps log
- Fit projection onto invariant pipi-mass squared eps log
- Fit projection onto beta eps log
- Fit projection onto p(tot) eps log
- Fit projection onto k+ eps log
- Fit projection onto k- eps log
- Fit projection onto k+ + k- eps log
- Fit projection onto k+ - k- eps log
- Fit projection onto invariant pipi-mass eps
- Fit projection onto invariant pipi-mass square eps
- Fit projection onto beta eps
- Fit projection onto p_tot eps
- Fit projection onto k+ eps
- Fit projection onto k- eps
- Fit projection onto k+ + k- eps
- Fit projection onto k+ - k- eps
- Fit projection onto invariant pipi-mass squared versus (k+ + k-) eps
- Fit projection onto invariant pipi-mass squared versus (k+ - k-) eps
- Mass template (correct mass assignment) for B0->pipi eps log
- Mass template (correct mass assignment) for B0->Kpi eps log
- Mass template (correct mass assignment) for B0->KK eps log
- Mass template (correct mass assignment) for B0s->pipi eps log
- Mass template (correct mass assignment) for B0s->Kpi eps log
- Mass template (correct mass assignment) for B0s->KK eps log
- Mass template (correct mass assignment) for Lb->ppi eps log
- Mass template (correct mass assignment) for Lb->pK eps log
- Universal Curves for positive particles eps
- Universal Curves for negative particles eps
- dE/dx residual in pion hypothesis for positive pions and kaons eps
- dE/dx residual in pion hypothesis for negative pions and kaons eps
- Invariant pπ mass distribution for antiΛ
^{0}->pπ: fit overlaid eps - Fit projection of the detector-induced charge asymmetry as a function of the invariant-pπ mass eps
- Invariant pπ mass distribution for Λ
^{0}->pπ: fit overlaid eps

With residuals