Future prospects for the determination of the Wilson coefficient $C_{7\gamma}^\prime$

Alain Le Yaouanc; Andrey Tayduganov; Damir Becirevic; Emi Kou

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Future prospects for the determination of the Wilson coefficient $C_{7\gamma}^\prime$

Damir Becirevic, Emi Kou, Alain Le Yaouanc, Andrey Tayduganov

High Energy Physics - Phenomenology · Submitted 7 Jun 2012

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

The authors' main claim By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of $C_{7\gamma}$ and $C_{7\gamma}^\prime$.

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arXiv ID1206.1502 (version 2)

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CitationAlain Le Yaouanc, Andrey Tayduganov, Damir Becirevic, Emi Kou. "Future prospects for the determination of the Wilson coefficient $C_{7\gamma}^\prime$." arXiv:1206.1502 (2012). https://pith.science/paper/5XDLRYYR

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We discuss the possibilities of assessing a non-zero $C_{7\gamma}^\prime$ from the direct and the indirect measurements of the photon polarization in the exclusive $b \to s\gamma^{(*)}$ decays. We focus on three methods and explore the following three decay modes: $B \to K^*(\to K_S\pi^0)\gamma$, $B \to K_1(\to K\pi\pi)\gamma$, and $B \to K^*(\to K\pi)\ell^+\ell^-$. By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of $C_{7\gamma}$ and $C_{7\gamma}^\prime$.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	We discuss the possibilities of assessing a non-zero $C_{7\gamma}^\prime$ from the direct and the indirect measurements of the photon polarization in the exclusive $b \to s\gamma^{(*)}$ decays.	contribution 0.90	0.29	0.10	hedged possibility 0.89
s1	We focus on three methods and explore the following three decay modes: $B \to K^(\to K_S\pi^0)\gamma$, $B \to K_1(\to K\pi\pi)\gamma$, and $B \to K^(\to K\pi)\ell^+\ell^-$.	method 0.55	0.46	0.04	asserted 0.87
s2	By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of $C_{7\gamma}$ and $C_{7\gamma}^\prime$.	result 0.56	0.77	0.88	hedged possibility 0.88

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Original abstract

We discuss the possibilities of assessing a non-zero $C_{7\gamma}^\prime$ from the direct and the indirect measurements of the photon polarization in the exclusive $b \to s\gamma^{(*)}$ decays. We focus on three methods and explore the following three decay modes: $B \to K^*(\to K_S\pi^0)\gamma$, $B \to K_1(\to K\pi\pi)\gamma$, and $B \to K^*(\to K\pi)\ell^+\ell^-$. By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of $C_{7\gamma}$ and $C_{7\gamma}^\prime$.

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References

Forward citations

Cited by 8 Pith papers

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

Study of the up-down asymmetry in $B^+\to K^+\pi^+\pi^-\gamma$ using $K_1(1270)$ amplitudes constrained by semileptonic $D$ Decays
hep-ex 2026-11 conditional novelty 6.0 of 10

Using K1(1270) amplitudes fitted to D semileptonic decays, the estimated hadronic factor for B+ to K+ pi+ pi- gamma lies below the LHCb expectation unless a K1(1400) contribution is added.
Reassessing the discovery potential of the $B \to K^{*} \ell^+\ell^-$ decays in the large-recoil region: SM challenges and BSM opportunities
hep-ph 2014-12 conditional novelty 6.0 of 10

Allowing power corrections to the heavy-quark limit to float reduces the B to K* mu mu angular anomaly from 3.7 sigma to below 2 sigma, and new muon-to-electron angular ratios are proposed as clean lepton-universality tests.
On B -> V l l at small dilepton invariant mass, power corrections, and new physics
hep-ph 2012-12 conditional novelty 6.0 of 10

The positive-helicity amplitudes in B to K* lepton pairs are suppressed by the V-A structure even including non-factorizable charm and light-quark corrections, leaving P1 and P3^CP as clean null tests sensitive to C'_...
Constraints on new physics from radiative $B$ decays
hep-ph 2016-08 accept novelty 5.0 of 10

Combining LHCb's B_s to phi gamma mass-eigenstate rate asymmetry and low-q² B to K* e+e- angular observables with older radiative data, the authors bound new physics in the dipole coefficients C7 and C7' at the few-pe...
B -> K^* Form Factors from Flavor Data to QCD and Back
hep-ph 2013-08 accept novelty 5.0 of 10

Form factor ratios extracted from B to K-star dilepton angular data at low recoil, combined with heavy-quark symmetry and LCSR input, yield Standard-Model-consistent predictions for A_FB and P'_5.

Show 3 more citing papers

New physics in $B \to K^*\mu\mu$?
hep-ph 2013-08 accept novelty 5.0 of 10

New physics in the semileptonic vector operators O9 and O9' with opposite sign fits the B -> K* mu mu angular anomalies best, implying new particles near the TeV scale.
Optimizing the basis of B->K*ll observables in the full kinematic range
hep-ph 2013-03 accept novelty 5.0 of 10

The authors define an optimal basis of form-factor-insensitive angular observables for B → K*ℓ+ℓ− and provide binned Standard Model predictions for both CP-averaged and CP-violating quantities.
Implications from clean observables for the binned analysis of B -> K*ll at large recoil
hep-ph 2012-07 conditional novelty 5.0 of 10

Binned, form-factor-insensitive angular observables in B -> K* mu mu are defined, predicted in the Standard Model, extracted from LHCb data, and shown to constrain New Physics in the Wilson coefficients C7, C9 and C10.

How the literature uses it

22 arXiv papers cite this in 39 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 · 27 sentences without a confident label

Uses its method or tool 1 paper

Here, following the discussion in [ref] , we study the three types of methods; i) The time-dependent $CP$-asymmetry of $B→K_Sπ^0γ$ ($S_K_Sπ^0γ$), ii) The angular distribution of the $B→K_1→Kππ$ decay ($λ_$), and iii) The angular analysis of $B→K^*(→Kπ)ℓ^+ℓ^-$ ($A_T^(2), A_T^(im)$).

Photon Polarization in the b->s gamma processes in the Left-Right Symmetric Model · Impacts of the future photon polarization measurement on the LRSM · 0.85

Uses its data or values 1 paper

The superKEKB with an integrated luminosity of $75 ab^-1$ and the LHCb with $2 fb^-1$ might reach the 20 ($|λ_γ|=0.8 |λ_γ^SM|$) and $10%$ ($|λ_γ|=0.9 |λ_γ^SM|$) precision, respectively [ref] .

Search for new physics via photon polarization of $b \rightarrow s \gamma$ · Photon polarization in SUSY SU(5) with right-handed neutrino · 0.81

Cites it as support 1 paper

While simple power counting leads to a relatively large possible range for this quantity [ref] , based on more refined parametric arguments implying the existence of a helicity suppression [ref] as well as on the above numerical estimates of the soft gluon charm loop contribution to $ΔC_7'$ from LCSR, we assume an uncertainty of $±0.4×10^-2$ on the real and imaginary parts of $ΔC_7'$ and consider this to be a conservative choice.

Constraints on new physics from radiative $B$ decays · Discussion of hadronic contributions · 0.97

Cites it as background 8 papers

A wealth of model-independent combined analyses of $b→sγ$ and $b→sℓ^+ℓ^-$ decays have appeared recently in the literature [ref] .

New Physics constraints from optimized observables in B -> K*ll at large recoil · Status of $b→s ℓ^+ℓ^-$ decays · 0.88
In addition to general global fits to radiative $B$-decays [ref] (see also Refs. [ref] ), there has been a growing literature aiming at determining the best set of observables with a reduced sensitivity to hadronic inputs, and the ability of these observables to find New Physics.

Optimizing the basis of B->K*ll observables in the full kinematic range · Comparison with other works · 0.97
For works exploiting the suppression of $f_+$, see [ref] .

B -> K^* Form Factors from Flavor Data to QCD and Back · Maximum recoil · 0.90

What it cites · 57 sentences without a confident label

Contests 2 papers

Contrary to Refs. [ref] we pointed out the complex hadronic structure of $K_1(1270)→Kππ$, that we studied in great detail in Ref. [ref] .

The strong decays of K1 resonances · GGPR and DDLR-inspired methods using $B→K_1(→Kππ)γ$ · contest 0.80
Contrary to Refs. [ref] we pointed out the complex hadronic structure of $K_1(1270)→Kππ$, that we studied in great detail in Ref. [ref] .

Measuring the Photon Helicity in Radiative B Decays · GGPR and DDLR-inspired methods using $B→K_1(→Kππ)γ$ · contest 0.80

Uses the method or tool of 1 paper

Using the anomalous dimension matrix from Ref. [ref] and running the coefficients $C_7γ^ (') ()$ from the SUSY scale $M_S$ (See Eq. [ref]) to the low scale $μ_b=m_b,pole$, in Fig. [ref] we show the potential constraints on the dominant $(δ_RL^d)_23$ MIA parameter for $m_≃m_=500$ GeV (plots on the left) and 1000 GeV (plots on the right) respectively.

Gluino Contribution to Radiative B Decays: Organization of QCD Corrections and Leading Order Results · SUSY models with large $(δ_RL^d)_23$ mass insertion · 0.98

Uses data or values from 11 papers

The region outside the gray (dark gray) circle is excluded at $3σ$ ($1σ$) level by the current measurement [ref] , [equation] which we combined with the SM prediction given in Ref. [ref] .

Averages of b-hadron, c-hadron, and tau-lepton Properties · Current constraint on $_7γ$ by $(B→X_sγ)$ and $S_K_Sπ^0γ$ · 0.98
The region outside the gray (dark gray) circle is excluded at $3σ$ ($1σ$) level by the current measurement [ref] , [equation] which we combined with the SM prediction given in Ref. [ref] .

QCD Anatomy of B -> X_s gamma Decays · Current constraint on $_7γ$ by $(B→X_sγ)$ and $S_K_Sπ^0γ$ · 0.98
In our numerics we use $_7γ(μ_b)=-0.304$ [ref] .

Photonic penguins at two loops and m_t-dependence of BR[ B -> X_s l^+ l^-] · Photon polarization in the $b→sγ$ process · 1.00

Compares with 1 paper

This is larger than the estimate made in Ref. [ref] (see Eq. [ref]).

Time-dependent CP Asymmetry in B->K* gamma as a (Quasi) Null Test of the Standard Model · Discussion of the $Ø_2$ contribution to the “wrong" helicity amplitude · 0.85

Cites as background 1 paper

In this sense the content of this paper is a contribution to the broad effort in the particle physics community to search for NP through $b→s$ exclusive decays [ref] .

New Physics in b -> s mu+ mu-: CP-Conserving Observables · Introduction · 0.83

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