Interplay of t --> b W Decay and B_q Meson Mixing in Minimal Flavor Violating Models

Abstract

Precise measurements of the top quark decay properties at hadron colliders offer interesting new possibilities of testing the standard model. At the same time, recent intriguing experimental results concerning CP violation in the B_d and B_s systems have stimulated many studies of physics beyond the standard model. We investigate anomalous t W d_j interactions as a possible source of new effects in B_{d,s} - bar B_{d,s} oscillations within a model independent approach based on the assumptions of Minimal Flavor Violation. After matching our effective operators onto the low-energy effective Lagrangian describing B_{d,s} meson mixing and evolving it down to the B-mass scale, we extract the preferred ranges of the anomalous t W d_j interactions at the weak scale. These values are then compared to previously considered constraints coming from the rare radiative B --> X_s gamma decay. Finally, we reconsider the associated effects in the t --> b W decays and find that the W helicity fractions F_{L,+} can deviate by as much as 15%, 30% from their standard model values, respectively. The deviations in F_L in particular, can reach the level of expected precision measurements at the LHC.

arXiv comment7 pages, 3 figures, published version

References in corpus (16)

• Minimal Flavour Violation: an effective field theory approach
• Universal Unitarity Triangle and Physics Beyond the Standard Model
• A minimal set of top anomalous couplings
• Flavor Physics in the Quark Sector
• General Minimal Flavor Violation
• Master Formulae for Delta F=2 NLO-QCD Factors in the Standard Model and Beyond
• Measurement of $\boldmath {B_s^0}$ mixing parameters from the flavor-tagged decay
• Evidence for an anomalous like-sign dimuon charge asymmetry
• B_d-Bbar_d Mixing and the B_d -> J/psi K_s Asymmetry in General SUSY Models
• Constraints on New Physics in MFV models: a model-independent analysis of Delta F=1 processes
• Anomalous Wtb coupling effects in the weak radiative B-meson decay
• Combining K-\bar K mixing and D-\bar D mixing to constrain the flavor structure of new physics
• Implications of the dimuon CP asymmetry in B_{d,s} decays
• ATLAS sensitivity to Wtb anomalous couplings in top quark decays
• Measurement of W-Boson Polarization in Top-quark Decay in ppbar Collisions at sqrt(s) = 1.96 TeV
• New physics in t-> b W decay at next-to-leading order in QCD

Cited by in corpus (27)

• Constraining the top-Higgs sector of the Standard Model Effective Field Theory
• Constraining the dipole moments of the top quark
• Measurement of the CP-violating phase ${\varphi }_s^{J/\psi \varphi }$ using the flavor-tagged decay $B_s^0\to J/\psi \varphi$ in 8 fb${}^{-1}$ of $p \barp$ collisions
• Measurement of the W boson polarization in top quark decays with the ATLAS detector
• Light Higgs and Vector-like Quarks without Prejudice
• The impact of flavour data on global fits of the MFV SMEFT
• Probing anomalous tWb interactions with rare B decays
• Constraints on Non-standard Top Quark Couplings
• A General Analysis of Wtb anomalous Couplings
• Measurement of the CP-Violating Phase beta_s in B0s -> J/Psi Phi Decays with the CDF II Detector
• More Synergies from Beauty, Top, $Z$ and Drell-Yan Measurements in SMEFT
• Probing anomalous tbW couplings in single-top production using top polarization at the Large Hadron Collider
• New directions for top quark polarization in the $t$-channel process
• Probing anomalous $t\bar{t}Z$ interactions with rare meson decays
• Effective Field Theory for Nonstandard Top Quark Couplings
• Matching for FCNC effects in the flavour-symmetric SMEFT
• Anomalous Top Couplings at Hadron Colliders Revisited
• Probing anomalous $Wtb$ couplings at the LHC in single top quark production through $t$-channel
• CP violation in tbW couplings at the LHC
• Anomalous $tqZ$ coupling effects in rare B- and K-meson decays
• Constraints on anomalous $tcZ$ coupling from $\bar{B}\to {\bar{K}}^{\ast }{\mu }^{+}{\mu }^{-}$ and $B_s\to {\mu }^{+}{\mu }^{-}$ decays
• New physics contributions to the forward-backward asymmetry at the Tevatron
• MEtop - a generator for single top production via FCNC interactions
• Dipole-induced anomalous top quark couplings at the LHC
• Minimal Flavour Violation and Anomalous Top Decays
• Constraints on the anomalous $Wtb$ couplings from $B$-physics experiments
• Top, Polarization, LHC and New Physics