Flavor models for $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$

Abstract

The ratio of the measured $\bar{B}\to D^{(\ast )}\ell \bar{\nu }$ decay rates for $\ell =\tau$ vs. $e,\mu$ deviate from the Standard Model (SM) by about $4\sigma$. We show that the data are in tension with the SM, independent of form factor calculations, and we update the SM prediction for $\mathcal{B}(B\to X_c\tau \bar{\nu })/\mathcal{B}(B\to X_c\ell \bar{\nu })$. We classify the operators that can accommodate the measured central values, as well as their UV completions. We identify models with leptoquark mediators that are minimally flavor violating in the quark sector, and are minimally flavor violating or $\tau$-aligned in the lepton sector. We explore experimental signatures of these scenarios, which are observable in the future at ATLAS/CMS, LHCb, or Belle II.

12 pages, 4 figures, v2: references added, v3: preliminary HFAG world average numbers updated, journal version, v4: sign error and subsequent discussion in Sec. III.B.3 corrected, all other results unaffected

References in corpus (16)

• On the B to D* tau nu Sensitivity to New Physics
• Implications of lepton flavor universality violations in B decays
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• General Minimal Flavor Violation
• New strategies for New Physics search in B -> K* nu anti-nu, B -> K nu anti-nu and B -> X(s) nu anti-nu decays
• B -> D tau nu Branching Ratios: Opportunity for Lattice QCD and Hadron Colliders
• Constraints on two-lepton, two quark operators
• Searches for third-generation squark production in fully hadronic final states in proton-proton collisions at sqrt(s) = 8 TeV
• Measurement of the form factors of the decay B0 -> D*- ell+ nu and determination of the CKM matrix element |Vcb|
• Minimal Flavour Violation for Leptoquarks
• Search for $W^{\prime }\to t\bar{b}$ in the lepton plus jets final state in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV with the ATLAS detector
• Search for $W^{\prime }\to tb\to qqbb$ Decays in pp Collisions at $\sqrt{s}$ = 8 TeV with the ATLAS Detector
• Search for third-generation scalar leptoquarks in the t-tau channel in proton-proton collisions at sqrt(s) = 8 TeV
• Precise predictions for B -> Xc tau nu decay distributions
• Measurement of the branching fraction of B^+ -> tau^+ nu_tau decays with the semileptonic tagging method

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