BSM models facing the recent LHCb data: A first look

Andrzej J. Buras; Jennifer Girrbach

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BSM models facing the recent LHCb data: A first look

Andrzej J. Buras, Jennifer Girrbach

High Energy Physics - Phenomenology · Submitted 23 Apr 2012

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim The recent data on S_{psi phi} and B_{s,d}-> mu^+ mu^- from the LHCb put an end to these very optimistic hopes modifying significantly the allowed patterns of deviations from SM predictions for flavour observables in concrete BSM models.

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During last decade a number of detailed analyses of flavour observables and of their correlations within more than a dozen specific BSM models have been performed at the TUM. One of the goals of these analyses was to investigate which model is capable of obtaining large mixing induced CP asymmetry in the B_s system, S_{psi phi}, and to find out what this would imply for other flavour observables. In this context also the rare decays B_{s,d}->mu^+ mu^- have been considered. In some models their branching ratios can be enhanced by orders of magnitude above the SM expectations. The recent data on S_{psi phi} and B_{s,d}-> mu^+ mu^- from the LHCb put an end to these very optimistic hopes modifying significantly the allowed patterns of deviations from SM predictions for flavour observables in concrete BSM models. We make a first semi-quantitative assessment of the most important modifications in the predictions of the BSM models in question including also recently analyzed models and taking into account the most recent lattice input. For some BSM models the LHCb data turned out to be a relief. On the other hand the SM, models with CMFV and MFV models without flavour blind phases appear to have significant difficulties in describing all Delta F=2 observables in B_{s,d} and K^0 meson systems simultaneously. We propose to regard the stringent CMFV relations between various observables as standard candels of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario.

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What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	During last decade a number of detailed analyses of flavour observables and of their correlations within more than a dozen specific BSM models have been performed at the TUM.	background 0.99	0.46	0.02	asserted 1.00
s1	One of the goals of these analyses was to investigate which model is capable of obtaining large mixing induced CP asymmetry in the B_s system, S_{psi phi}, and to find out what this would imply for other flavour observables.	background 0.92	0.26	0.04	asserted 0.94
s2	In this context also the rare decays B_{s,d}->mu^+ mu^- have been considered.	background 0.86	0.21	0.02	asserted 0.98
s3	In some models their branching ratios can be enhanced by orders of magnitude above the SM expectations.	background 0.96	0.12	0.03	hedged possibility 0.94
s4	The recent data on S_{psi phi} and B_{s,d}-> mu^+ mu^- from the LHCb put an end to these very optimistic hopes modifying significantly the allowed patterns of deviations from SM predictions for flavour observables in concrete BSM models.	interpretation 0.36	0.09	0.55	asserted 1.00
s5	We make a first semi-quantitative assessment of the most important modifications in the predictions of the BSM models in question including also recently analyzed models and taking into account the most recent lattice input.	contribution 0.98	0.90	0.08	asserted 0.95
s6	For some BSM models the LHCb data turned out to be a relief.	interpretation 0.52	0.77	0.06	asserted 1.00
s7	On the other hand the SM, models with CMFV and MFV models without flavour blind phases appear to have significant difficulties in describing all Delta F=2 observables in B_{s,d} and K^0 meson systems simultaneously.	result 0.91	0.68	0.25	asserted 0.96
s8	We propose to regard the stringent CMFV relations between various observables as standard candels of flavour physics.	future work 0.54	0.53	0.23	asserted 0.62
s9	The pattern of deviations from these relations may help in identifying the correct NP scenario.	interpretation 0.76	0.30	0.27	hedged possibility 1.00

What kind of paper the classifier reports this is: review 0.35 · evidence from analysis of existing data 0.95.

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Original abstract

During last decade a number of detailed analyses of flavour observables and of their correlations within more than a dozen specific BSM models have been performed at the TUM. One of the goals of these analyses was to investigate which model is capable of obtaining large mixing induced CP asymmetry in the B_s system, S_{psi phi}, and to find out what this would imply for other flavour observables. In this context also the rare decays B_{s,d}->mu^+ mu^- have been considered. In some models their branching ratios can be enhanced by orders of magnitude above the SM expectations. The recent data on S_{psi phi} and B_{s,d}-> mu^+ mu^- from the LHCb put an end to these very optimistic hopes modifying significantly the allowed patterns of deviations from SM predictions for flavour observables in concrete BSM models. We make a first semi-quantitative assessment of the most important modifications in the predictions of the BSM models in question including also recently analyzed models and taking into account the most recent lattice input. For some BSM models the LHCb data turned out to be a relief. On the other hand the SM, models with CMFV and MFV models without flavour blind phases appear to have significant difficulties in describing all Delta F=2 observables in B_{s,d} and K^0 meson systems simultaneously. We propose to regard the stringent CMFV relations between various observables as standard candels of flavour physics. The pattern of deviations from these relations may help in identifying the correct NP scenario.

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References

Forward citations

Cited by 12 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

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New Fermilab-MILC lattice data sharpen a 2.3-sigma tension between B-meson mixing and kaon CP violation in CMFV models, implying new physics beyond this framework.
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The paper classifies new-physics scenarios for B_s to mu+ mu- and shows that time-dependent rate observables can discriminate between gauge-boson, scalar, and pseudoscalar explanations.
The Anatomy of Z' and Z with Flavour Changing Neutral Currents in the Flavour Precision Era
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The Anatomy of Quark Flavour Observables in 331 Models in the Flavour Precision Era
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In the 331 model with a heavy Z-prime, four parameter regions survive current flavour data, and the rare decays B_d to mu mu plus the CP asymmetry in B_s to mu mu can in future identify which one is correct.

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On the Standard Model prediction for BR(B{s,d} to mu+ mu-)
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The Standard Model predicts a non-radiative B_s to mu+ mu- branching ratio of (3.23 +/- 0.27) x 10^-9, with soft-photon emission suppressing the experimentally observed rate by about 11 percent at a 60 MeV photon-energy cut.
On the Correlations between Flavour Observables in Minimal U(2)^3 Models
hep-ph 2012-06 conditional novelty 5.0 of 10

In minimal U(2)^3 flavour models the CP asymmetries S_psiKS and S_psiphi and the CKM element |V_ub| are locked into one correlation, so any two determine the third.
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Combining the B_s -> mu+mu- bound with the measured B -> K l+l- rate yields joint, phase-sensitive constraints on new-physics Wilson coefficients, with |C_S| < 0.7, |C_P| < 1.0, and 2.2 < sqrt(|C10|^2+|C'10|^2) < 4.8.
Towards the Identification of New Physics through Quark Flavour Violating Processes
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The paper proposes a twelve-step, correlation-based program and DNA charts for identifying new physics from quark-flavor observables, illustrated with CMFV, MFV, two-Higgs-doublet, and tree-level Z-prime and scalar scenarios.
Implications of LHCb measurements and future prospects
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LHCb's first 1.0 fb^-1 of 7 TeV data already constrain several new-physics scenarios, and a proposed upgrade to 50 fb^-1 would sharpen those constraints by roughly an order of magnitude.
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How the literature uses it

27 arXiv papers cite this in 67 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 43 sentences without a confident label

Contests it 1 paper

Here we differ from the authors of [ref] who using the $$ in ([ref]) concluded that a striking prediction of the $U(2)^3$ framework is a value of $S_ψϕ$ in the range $0.05≤S_ψϕ≤0.20$ implying that a future negative value of $S_ψϕ$ would rule out this framework[The same conclusion is reached in the $2HDM_MFV$ framework [ref] but in this case no escape through a low value of $$ is possible as in this model the contributions to $ε_K$ are tiny.].

On the Correlations between Flavour Observables in Minimal U(2)^3 Models · Introduction · contest 0.80

Builds on it 1 paper

Therefore it is useful to generalize the most interesting among these relations to include possible breakdown of them as follows [ref] :

The Anatomy of Quark Flavour Observables in 331 Models in the Flavour Precision Era · Breakdown of CMFV Relation in the 331 Model · 0.81

Uses its data or values 1 paper

The present 95% C.L. upper bound $ℬ(B_s→μ^+μ^-)≤4.5·10^-9$ [ref] is already close to the Standard model (SM) prediction $ℬ(B_s→μ^+μ^-)^SM = (3.1±0.2)·10^-9$ [ref] [In [ref] the “non-radiative” branching ratio that corresponds to the branching ration fully inclusive of bremsstrahlung radiation was calculated to $ℬ(B_s→μ^+μ^-) =(3.23 ±0.27) ·10^-9$.].

Correlations in Minimal U(2)^3 models and an SO(10) SUSY GUT model facing new data · Current situation of the flavour data · 0.86

Compares with it 2 papers

We have also checked our allowed regions for Wilson coefficients against the results of the global fit presented in Altmannshofer et al in [ref] .

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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.

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Cites it as support 2 papers

But as shown for $2HDM_MFV$ in Ref. [ref] the present upper bounds on EDMs do not yet have any impact on the observables considered here [We thank Minoru Nagai for enlighting comments on these issues.]. * On the contrary, $ΔM_s$ receives a small (suppressed by $m_s/m_b$) negative contribution which is good as the SM value is roughly $10%$ above its experimental value [ref] .

Probing New Physics with the B_s to {\mu}+ {\mu}- Time-Dependent Rate · Numerical Analysis · 0.96
However, as pointed out in [ref] , this spoils the agreement with the data on $ΔM_s,d$, signalling the tension between $ΔM_s,d$ and $ε_K$ in CMFV models.

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Cites it as background 13 papers

These transitions with their strongly suppressed rates offer hence powerful probes to search for footprints of “New Physics" (NP) originating from beyond the SM (see [ref] and references therein).

Theory News on $B_{s(d)} \to \mu^+\mu^-$ Decays · Introduction · 0.92
A short summary of this work can also be found in [ref] .

Correlations in Minimal U(2)^3 models and an SO(10) SUSY GUT model facing new data · SO(10) SUSY GUT: CMM model · 0.80
More interesting in this context are the operators Q_1^SLL=(b̅ P_L s)(b̅ P_L s) , Q_2^SLL=(b̅ σ_μν P_L s)(b̅σ^μν P_L s) present in the $2HDM_MFV$ framework [ref] .

On the Correlations between Flavour Observables in Minimal U(2)^3 Models · Minimal $U(2)^3$ Models · 0.84

What it cites · 137 sentences without a confident label

Builds on 3 papers

While in [ref] only the case of FBPs in Yukawa interactions has been considered, in [ref] these considerations have been extended to include also the FBPs in the Higgs potential.

Higgs-mediated FCNCs: Natural Flavour Conservation vs. Minimal Flavour Violation · Preliminaries · 0.95
While in [ref] only the case of FBPs in Yukawa interactions has been considered, in [ref] these considerations have been extended to include also the FBPs in the Higgs potential.

EDMs vs. CPV in B_{s,d} mixing in two Higgs doublet models with MFV · Preliminaries · 0.95
In Section [ref], the main section of this writing, we will have a first look at the modifications of the results of all models considered in [ref] , adding few models that have been analysed by us since then.

Minimal flavour violation and beyond: Towards a flavour code for short distance dynamics · Introduction · 0.88

Uses the method or tool of 1 paper

The reason why we can at all make any statements about the changes in predictions of various models without basically performing any new numerical analysis is that the strategy of the analyses discussed in [ref] was to present the predictions for various observables as functions of $S_ψϕ$.

Minimal flavour violation and beyond: Towards a flavour code for short distance dynamics · Introduction · 0.86

Uses data or values from 5 papers

Indeed, the most recent data on $S_ψϕ$ and $B_s,d→μ^+μ^-$ decays from LHCb read [ref] S_ψϕ=0.002±0.087, S^SM_ψϕ=0.035±0.002, ℬ(B_s→μ^+μ^-) ≤4.5×10^-9, ℬ(B_s→μ^+μ^-)^SM=(3.1±0.2)×10^-9, ℬ(B_d→μ^+μ^-) ≤8.1×10^-10, ℬ(B_d→μ^+μ^-)^SM=(1.0±0.1)×10^-10, where we have also shown updated SM predictions for these observables as discussed in Section [ref].

Strong constraints on the rare decays Bs -> mu+ mu- and B0 -> mu+ mu- · Introduction · 1.00
The authors of [ref] find $r(ΔΓ_s)=0.91±0.01$.

Probing New Physics via the $B^0_s\to \mu^+\mu^-$ Effective Lifetime · Introduction · 1.00
The authors of [ref] find $r(ΔΓ_s)=0.91±0.01$.

Branching Ratio Measurements of $B_s$ Decays · Introduction · 1.00

Compares with 1 paper

They differ only marginally from those quoted in [ref] and given in ([ref]) and ([ref]).

Minimal flavour violation and beyond: Towards a flavour code for short distance dynamics · Introduction · 0.91

Cites as background 69 papers

The relations ([ref])-([ref]), ([ref]) and other relations discussed in [ref] can be regarded as standard candels of flavour physics and the deviations from them may help in identifying the correct NP scenario.

Minimal Flavour Violation · Constrained Minimal Flavour Violation (CMFV) · 0.82
Finally, our strategy won't be to repeat any details of the models considered here, because in [ref] a rather compact presentation of most of them can be found.

Minimal flavour violation and beyond: Towards a flavour code for short distance dynamics · Introduction · 0.90
The simplest class of extensions of the SM are models with CMFV [ref] .

Universal Unitarity Triangle and Physics Beyond the Standard Model · Constrained Minimal Flavour Violation (CMFV) · 0.95

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