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The Anatomy of Neutral Scalars with FCNCs in the Flavour Precision Era
High Energy Physics - Phenomenology · Submitted 15 Mar 2013
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We identify a number of correlations between various flavour observables that could test and distinguish these different scenarios.
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The abstract, sentence by sentence
In many extensions of the Standard Model flavour changing neutral current processes can be mediated by tree-level heavy neutral scalars and/or pseudo-scalars H^0(A^0). This generally introduces new sources of flavour violation and CP violation as well as left-handed and right-handed scalar currents. These new physics contributions imply a pattern of deviations from SM expectations for FCNC processes that depends only on the couplings of H^0(A^0) to fermions and on their masses. In situations in which a single H^0 or A^0 dominates NP contributions stringent correlations between Delta F=2 and Delta F=1 observables exist. Anticipating the Flavour Precision Era ahead of us we illustrate this by searching for allowed oases in the landscape of a given model assuming significantly smaller uncertainties in CKM and hadronic parameters than presently available. To this end we analyze Delta F=2 observables in B^0_{s,d}-bar B^0_{s,d} and K^0-bar K^0 systems and rare B and K decays with charged leptons in the final state including both left-handed and right-handed scalar couplings of H^0 and A^0 to quarks in various combinations. We identify a number of correlations between various flavour observables that could test and distinguish these different scenarios. The prominent role of the decays B_{s,d}-> mu^+ mu^- in these studies is emphasized. Imposing the existing flavour constraints, a rich pattern of deviations from the SM expectations in rare B_{s,d} decays emerges provided M_H< 1 TeV. NP effects in rare K decays are very small. Neutral SM Higgs contributions to rare B and K decays turn out to be negligible once the constraints from Delta F=2 processes are taken into account. Finally, we point out striking differences between the correlations found here and in scenarios in which tree-level FCNC are mediated by a new neutral gauge boson Z'.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In many extensions of the Standard Model flavour changing neutral current processes can be mediated by tree-level heavy neutral scalars and/or pseudo-scalars H^0(A^0). | background 1.00 | 0.05 | 0.03 | hedged possibility 0.76 |
| s1 | This generally introduces new sources of flavour violation and CP violation as well as left-handed and right-handed scalar currents. | background 1.00 | 0.05 | 0.03 | asserted 0.65 |
| s2 | These new physics contributions imply a pattern of deviations from SM expectations for FCNC processes that depends only on the couplings of H^0(A^0) to fermions and on their masses. | background 0.61 | 0.12 | 0.14 | asserted 0.98 |
| s3 | In situations in which a single H^0 or A^0 dominates NP contributions stringent correlations between Delta F=2 and Delta F=1 observables exist. | background 0.61 | 0.20 | 0.14 | asserted 0.95 |
| s4 | Anticipating the Flavour Precision Era ahead of us we illustrate this by searching for allowed oases in the landscape of a given model assuming significantly smaller uncertainties in CKM and hadronic parameters than presently available. | contribution 0.51 | 0.49 | 0.04 | asserted 0.72 |
| s5 | To this end we analyze Delta F=2 observables in B^0_{s,d}-bar B^0_{s,d} and K^0-bar K^0 systems and rare B and K decays with charged leptons in the final state including both left-handed and right-handed scalar couplings of H^0 and A^0 to quarks in various combinations. | method 0.86 | 0.91 | 0.05 | asserted 0.94 |
| s6 | We identify a number of correlations between various flavour observables that could test and distinguish these different scenarios. | result 0.86 | 0.93 | 0.25 | hedged possibility 0.77 |
| s7 | The prominent role of the decays B_{s,d}-> mu^+ mu^- in these studies is emphasized. | interpretation 0.45 | 0.58 | 0.09 | asserted 1.00 |
| s8 | Imposing the existing flavour constraints, a rich pattern of deviations from the SM expectations in rare B_{s,d} decays emerges provided M_H< 1 TeV. | result 1.00 | 0.85 | 0.26 | asserted 0.72 |
| s9 | NP effects in rare K decays are very small. | result 1.00 | 0.79 | 0.07 | asserted 1.00 |
| s10 | Neutral SM Higgs contributions to rare B and K decays turn out to be negligible once the constraints from Delta F=2 processes are taken into account. | result 1.00 | 0.84 | 0.11 | asserted 1.00 |
| s11 | Finally, we point out striking differences between the correlations found here and in scenarios in which tree-level FCNC are mediated by a new neutral gauge boson Z'. | result 0.62 | 0.84 | 0.15 | asserted 1.00 |
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Original abstract
In many extensions of the Standard Model flavour changing neutral current processes can be mediated by tree-level heavy neutral scalars and/or pseudo-scalars H^0(A^0). This generally introduces new sources of flavour violation and CP violation as well as left-handed and right-handed scalar currents. These new physics contributions imply a pattern of deviations from SM expectations for FCNC processes that depends only on the couplings of H^0(A^0) to fermions and on their masses. In situations in which a single H^0 or A^0 dominates NP contributions stringent correlations between Delta F=2 and Delta F=1 observables exist. Anticipating the Flavour Precision Era ahead of us we illustrate this by searching for allowed oases in the landscape of a given model assuming significantly smaller uncertainties in CKM and hadronic parameters than presently available. To this end we analyze Delta F=2 observables in B^0_{s,d}-bar B^0_{s,d} and K^0-bar K^0 systems and rare B and K decays with charged leptons in the final state including both left-handed and right-handed scalar couplings of H^0 and A^0 to quarks in various combinations. We identify a number of correlations between various flavour observables that could test and distinguish these different scenarios. The prominent role of the decays B_{s,d}-> mu^+ mu^- in these studies is emphasized. Imposing the existing flavour constraints, a rich pattern of deviations from the SM expectations in rare B_{s,d} decays emerges provided M_H< 1 TeV. NP effects in rare K decays are very small. Neutral SM Higgs contributions to rare B and K decays turn out to be negligible once the constraints from Delta F=2 processes are taken into account. Finally, we point out striking differences between the correlations found here and in scenarios in which tree-level FCNC are mediated by a new neutral gauge boson Z'.
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References
How the literature uses it
25 arXiv papers cite this in 73 sentences
Papers citing it · 52 sentences without a confident label
Builds on it 2 papers
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Here we will complement this study by computing the correlations among $R$, $𝒜^μμ_ΔΓ$, and $S_μμ$, while taking the constraints from $ΔF=2$ observables computed in Ref. [ref] into account.
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Basic Formulae · 0.92
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Afterwards this approach is extended to more general $Z^'$ and also scalar scenarios [ref] .
Searching for New Physics through correlations of Flavour Observables · Phenomenology of $Z^'$, new (pseudo) scalar $A^0/H^0$ and vectorlike fermions · 0.93
Uses its method or tool 1 paper
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The hadronic matrix elements for $ΔF=2$ processes are very important and were included together with the QCD running of the Wilson coefficients from the NP scale down to the meson scale; this was done in line with Refs. [ref] .
Classification of anomaly-free 2HDMs with a gauged U(1)' symmetry · Meson constraints · 1.00
Uses its data or values 3 papers
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From Ref. [ref] we have [equation] with the decay constants $F_B_d=188$ MeV and $F_B_s=225$ MeV, the meson masses $m_B_d=5279$ MeV and $m_B_s=5366$ MeV, and the factors $B̂_d=1.26$, $B_s=1.33$ and $η_B=0.55$.
CP4 miracle: shaping Yukawa sector with CP symmetry of order four · Parameter space of the Yukawa sector · 0.97
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Concerning the values of the $Δ̃_P^μμ̅(H)$ and $Δ_S^μμ̅(H)$ we will set as in [ref]
Towards the Identification of New Physics through Quark Flavour Violating Processes · Tree-Level Scalar and Pseudoscalar Exchanges · 0.91
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Other relevant input can be found in the Tables of Ref. [ref] .
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Numerical Analysis · 0.91
Compares with it 2 papers
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This picture of short distances should be contrasted with the LR and ALR scenarios analysed in [ref] , in which the LH and RH couplings were of the same size.
Can we reach the Zeptouniverse with rare K and B_{s,d} decays? · L+R scenario · 0.99
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The spirit of the present paper differs also from our recent studies of NP models, in particular in [ref] , where the emphasize has been put on correlations between observables, still to be measured, rather than the correlations between parameters of a given NP model.
Stringent Tests of Constrained Minimal Flavour Violation through Delta F=2 Transitions · Introduction · 0.84
Cites it as support 2 papers
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The constraints from $b→sℓ^+ℓ^-$ transitions do not have any impact in the (pseudo) scalar case as shown in Ref. [ref] .
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Numerical Analysis · 0.99
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The constraints from $b→sℓ^+ℓ^-$ transitions do not have any impact in the (pseudo) scalar case as shown in Ref. [ref] .
Searching for New Physics through correlations of Flavour Observables · General $Z^'$ and $A^0/H^0$ scenarios · 0.97
Cites it as background 6 papers
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A very detailed analysis of generic scalar tree-level contributions to $ΔF=2$ and $ΔF=1$ processes has been presented in [ref] .
Can we reach the Zeptouniverse with rare K and B_{s,d} decays? · Preliminaries · 0.92
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A general analysis of FCNC processes within such scenarios has been recently presented in Ref. [ref] .
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Basic Formulae · 0.80
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The existence of FCNC couplings of the Higgs boson to fermions occur in many extensions of the SM in the Higgs sector [ref] , such as multi-Higgs doublet models [ref] .
Constraints and Implications on Higgs FCNC Couplings from Precision Measurement of $B_s \to \mu^+\mu^-$ Decay · Introduction · 0.87
What it cites · 93 sentences without a confident label
Builds on 3 papers
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As demonstrated in the context of the corresponding analysis within RSc [ref] , also in the presence of RH currents two complex functions $Y_K$ and $Z_K$ are sufficient to describe jointly the SM and NP contributions.
Rare K and B Decays in a Warped Extra Dimension with Custodial Protection · $K_L→π^0ℓ^+ℓ^-$ · 0.86
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Similarly to the anatomy of $Z'$ models in [ref] we will deal with two scenarios for $$ and four scenarios LHS, RHS, LRS, ALRS for flavour violating couplings of $H$ to quarks.
The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era · Preliminaries · 0.84
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While $ΔΓ_d$ is very small and $y_d$ can be set to zero, in the case of $B_d→μ^+μ^-$ one can still consider the CP asymmetry $S_μμ^d$ [ref] , for which one can use all expressions given above with the flavour index “$s$” replaced by “$d$”.
On Branching Ratios of $B_s$ Decays and the Search for New Physics in $B^0_s\to \mu^+\mu^-$ · Observables for $B_s→μ^+ μ^-$ · 0.88
Uses the method or tool of 2 papers
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As in [ref] we will perform a simplified analysis of $ε_K$, $ΔM_d,s$, $S_ψK_S$ and $S_ψϕ$ in order to identify oases in the space of new parameters (see Section [ref]) for which these five observables are consistent with experiment.
The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era · Simplified Analysis · 0.84
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Details can be found in [ref] .
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Present Data · 0.87
Uses data or values from 11 papers
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The most recent results from LHCb read [ref] ℬ(B_s→μ^+μ^-) = (3.2^+1.5_-1.2) ×10^-9, ℬ(B_s→μ^+μ^-)_SM=(3.25±0.17)×10^-9, ℬ(B_d→μ^+μ^-) ≤9.4×10^-10, ℬ(B_d→μ^+μ^-)_SM=(1.05±0.07)×10^-10.
First evidence for the decay Bs -> mu+ mu- · Present Data · 1.00
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The most recent results from LHCb read [ref] ℬ(B_s→μ^+μ^-) = (3.2^+1.5_-1.2) ×10^-9, ℬ(B_s→μ^+μ^-)_SM=(3.25±0.17)×10^-9, ℬ(B_d→μ^+μ^-) ≤9.4×10^-10, ℬ(B_d→μ^+μ^-)_SM=(1.05±0.07)×10^-10.
Strong constraints on the rare decays Bs -> mu+ mu- and B0 -> mu+ mu- · Present Data · 1.00
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Next $φ_= (43.51±0.05)^∘$ and $κ_=0.94±0.02$ [ref] takes into account that $φ_π4$ and includes long distance effects in $( Γ_12)$ and $(M_12)$.
Correlations among new CP violating effects in Delta F = 2 observables · Basic Formulae for $ΔF=2$ Observables · 0.99
Compares with 1 paper
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With this insight at hand we can easily understand the plots in the left panels in Figs. [ref] and [ref] and analogous plots in the left panels of Figs. 7 and 8 in [ref] .
The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era · The $B_d$ Meson System · 0.84
Cites as background 8 papers
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In a recent paper [ref] an anatomy of neutral gauge boson ($Z'$ and $Z$) couplings to quark flavour changing neutral currents (FCNC) has been presented.
The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era · Introduction · 0.86
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General discussion can be found in [ref] .
On the Correlations between Flavour Observables in Minimal U(2)^3 Models · The $U(2)^3$ Limit · 1.00
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In the general analysis of $B_s→μ^+ μ^-$ in [ref] , which goes beyond the NP scenario considered here, the basic four observables are R, 𝒜^μμ_ΔΓ, S^s_μμ, S_ψϕ.
Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Observables for $B_s→μ^+ μ^-$ · 0.83
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