Deciphering top flavor violation at the LHC with B factories

Abstract

The LHC will have unprecedented sensitivity to flavor-changing neutral current (FCNC) top quark decays, whose observation would be a clear sign of physics beyond the standard model. Although many details of top flavor violation are model dependent, the standard model gauge symmetries relate top FCNCs to other processes, which are strongly constrained by existing data. We study these constraints in a model independent way, using a low energy effective theory from which the new physics is integrated out. We consider the most important operators which contribute to top FCNCs and analyze the current constraints on them. We find that the data rule out top FCNCs at a level observable at the LHC due to most of the operators comprising left-handed first or second generation quark fields, while there remains a substantial window for top decays mediated by operators with right-handed charm or up quarks. If FCNC top decays are observed at the LHC, such an analysis may help decipher the underlying physics.

17 pages, 5 figures; some typos corrected

References in corpus (8)

• B->V gamma Beyond QCD Factorisation
• Collider Signals of Top Quark Flavor Violation from a Warped Extra Dimension
• SUSY-induced FCNC top-quark processes at the Large Hadron Collider
• New Physics effects in the flavor-changing neutral couplings of the Top quark
• Study of ATLAS sensitivity to FCNC top decays
• Extracting short distance information from b -> s l+ l- effectively
• Minimal Flavour Violation Waiting for Precise Measurements of Delta M_s, S_{psi phi}, A^s_SL, |V_ub|, gamma and B^0_{s,d} -> mu+ mu-
• Testing the left-handedness of the b \to c transition

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• eHDECAY: an Implementation of the Higgs Effective Lagrangian into HDECAY
• New physics in $B$ meson mixing: future sensitivity and limitations
• On the Flavor Structure of Natural Composite Higgs Models & Top Flavor Violation
• Dimension six FCNC operators and top production at the LHC
• R-parity violating effects in top quark FCNC productions at LHC
• QCD Corrections to Flavor Changing Neutral Coupling Mediated Rare Top Quark Decays
• Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
• Signatures of NP models in top FCNC decay t --> c(u) l+ l-
• UV physics from IR features: new prospects from top flavor violation
• Covariant Description of Flavor Conversion in the LHC Era
• Covariant Description of Flavor Violation at the LHC
• B -> Xsγconstraints on the top quark anomalous t-> cγcoupling
• Machine Learning Approaches to Top Quark Flavor-Changing Four-Fermion Interactions in Trilepton Signals at the LHC
• Top quark physics in the Large Hadron Collider era
• Top Decays in the Standard Model and Beyond