Top B Physics at the LHC

Abstract

In top-pair events where at least one of the tops decays semi-leptonically, the identification of the lepton charge allows to tag not only the top charge but also that of the subsequent b quark. In cases where the b also decays semi-leptonically, the charge of the two leptons can be used to probe CP violation in heavy flavor mixing and decays. This strategy to measure CP violation is independent of those adopted so far in experiments, and can already constrain non Standard Model sources of CP violation with current and near future LHC data. To demonstrate the potential of this method we construct two CP asymmetries based on same-sign and opposite-sign leptons and estimate their sensitivities. This proposal opens a new window for doing precision measurements of CP violation in b and c quark physics via high p_T processes at ATLAS and CMS.

5 pages, 2 figures. v2: Slightly improved the b-charge association analysis; some discussions and clarifications added; fixed typos in Eqs. (29)-(32). Matches published version

References in corpus (8)

• PYTHIA 6.4 Physics and Manual
• NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels
• QCD radiation in the production of heavy colored particles at the LHC
• Anatomy of New Physics in B-Bbar mixing
• Automation of the matrix element reweighting method
• Testing New Indirect CP Violation
• On Indirect CP Violation and Implications for D0-\overline{D0} and Bs -\overline{Bs} mixing
• Measurement of the top quark mass in the lepton+jets final state with the matrix element method

Cited by in corpus (5)

• Physics Opportunities of a 100 TeV Proton-Proton Collider
• CP violation in the B system
• Heavy baryons as polarimeters at colliders
• Measurements of charge and CP asymmetries in $b$-hadron decays using top-quark events collected by the ATLAS detector in $pp$ collisions at $\sqrt{s}=8$ TeV
• Probing the top-quark width using the charge identification of $b$ jets