Minimally flavored colored scalar in B→ D^( * )τ ν and the mass matrices constraints

2013/06/30 by Ilja Doršner, Ilja Dorsner, Svjetlana Fajfer +4 · 10 citations
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Colored #Combinatorics #Cosmology and Gravitation Theories #Geometry #Materials science #Mathematics #Overline #Particle physics #Particle physics theoretical and experimental studies #Physics #Scalar (mathematics) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep11(2013)084

30 pp, 6 figures; v2: includes additional constraints

arxiv created 2013/09/20 · openalex publication_date 2013/11/01 · arxiv updated 2015/06/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The presence of a colored scalar that is a weak doublet with fractional electric charges of |Q|=2/3 and |Q|=5/3 with mass below 1,TeV can provide an explanation of the observed branching ratios in B → D^(*) τ ν decays. The required combination of scalar and tensor operators in the effective Hamiltonian for b → c τ ν is generated through the t-channel exchange. We focus on a scenario with a minimal set of Yukawa couplings that can address a semitauonic puzzle and show that its resolution puts a nontrivial bound on the product of the scalar couplings to τb and c ν. We also derive additional constraints posed by Z → b b, muon magnetic moment, lepton flavor violating decays μ→ e γ, τ→ μγ, τ→ e γ, and τ electric dipole moment. The minimal set of Yukawa couplings is not only compatible with the mass generation in an SU(5) unification framework, a natural environment for colored scalars, but specifies all matter mixing parameters except for one angle in the up-type quark sector. We accordingly spell out predictions for the proton decay signatures through gauge boson exchange and show that p → π⁰ e⁺ is suppressed with respect to p → K⁺ ν and even p → K⁰ e⁺ in some parts of available parameter space. Impact of the colored scalar embedding in 45-dimensional representation of SU(5) on low-energy phenomenology is also presented. Finally, we make predictions for rare top and charm decays where presence of this scalar can be tested independently.

Citations

• Review of Particle Physics
• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Baryon form factors
• Quenched lattice calculation of semileptonic heavy-light meson form factors
• A new lepton-quark mass relation in a unified theory
• Unity of All Elementary-Particle Forces
• Proton lifetime bounds from chirally symmetric lattice QCD
• Lepton number as the fourth "color"
• Searches for Lepton Flavor Violation in the Decaysτ±→e±γandτ±→μ±γ
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Proton stability, dark matter, and light color octet scalars in adjointSU(5)unification
• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Evidence for an Excess ofB¯→D(*)τ−ν¯τDecays

Cited by

• Scalar contributions to b→c(u)τν transitions
• Y and ψ leptonic decays as probes of solutions to the R(D (*)) puzzle
• Rare semileptonicB→K*ℓ+ℓ−decays in theRScmodel
• Combined explanations of (g−2)μ, RD(*), RK(*) anomalies in a two-loop radiative neutrino mass model
• A measurable angular distribution for B→ D^∗ τ^-v_τ decays
• B-meson charged current anomalies: The post-Moriond 2019 status
• D* polarization vs. R_{D^{(∗ )}} anomalies in the leptoquark models
• Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at s=13 TeV
• Low-energy phenomenology of scalar leptoquarks at one-loop accuracy
• Measurement of the τ Lepton Polarization and R(D*) in the Decay B¯→D*τ−ν¯τ

Related

• Lepton Flavour Violating tau and mu decays induced by scalar leptoquark
• Scalar diquark in t tbar production and constraints on Yukawa sector of grand unified theories
• New Physics Scenarios in b → c ℓ ν_ℓ decays
• Flavor Physics Constraints on TeV Scale Color Sextet Scalars
• New physics searches in B → D^(*)τν decays