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Mixing-induced CP Asymmetries in Radiative B Decays in and beyond the Standard Model
High Energy Physics - Phenomenology · Submitted 9 Apr 1997
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2)xU(1) models with exotic fermions and SUSY, the amplitude of right-handed photons grows proportional to the virtual heavy fermion mass, which can lead to large asymmetries.
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The abstract, sentence by sentence
In the Standard Model (SM) the photon in radiative $\bar B^0$ and $\bar B_s$ decays is predominantly left-handed. Thus, mixing induced CP asymmetries in $b\to s\gamma$ and $b\to d\gamma$ are suppressed by $m_s/m_b$ and $m_d/m_b$, respectively, and are very small. In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2)xU(1) models with exotic fermions and SUSY, the amplitude of right-handed photons grows proportional to the virtual heavy fermion mass, which can lead to large asymmetries. As an example, in the LRSM, asymmetries larger than 50% are possible even when radiative decay rate measurements agree with SM predictions.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In the Standard Model (SM) the photon in radiative $\bar B^0$ and $\bar B_s$ decays is predominantly left-handed. | background 1.00 | 0.06 | 0.05 | asserted 0.99 |
| s1 | Thus, mixing induced CP asymmetries in $b\to s\gamma$ and $b\to d\gamma$ are suppressed by $m_s/m_b$ and $m_d/m_b$, respectively, and are very small. | background 0.90 | 0.13 | 0.12 | asserted 1.00 |
| s2 | In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2)xU(1) models with exotic fermions and SUSY, the amplitude of right-handed photons grows proportional to the virtual heavy fermion mass, which can lead to large asymmetries. | background 0.86 | 0.09 | 0.26 | hedged possibility 0.70 |
| s3 | As an example, in the LRSM, asymmetries larger than 50% are possible even when radiative decay rate measurements agree with SM predictions. | result 0.81 | 0.25 | 0.39 | hedged possibility 0.98 |
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The paper
Original abstract
In the Standard Model (SM) the photon in radiative $\bar B^0$ and $\bar B_s$ decays is predominantly left-handed. Thus, mixing induced CP asymmetries in $b\to s\gamma$ and $b\to d\gamma$ are suppressed by $m_s/m_b$ and $m_d/m_b$, respectively, and are very small. In many extensions of the SM, such as the left-right symmetric model (LRSM), SU(2)xU(1) models with exotic fermions and SUSY, the amplitude of right-handed photons grows proportional to the virtual heavy fermion mass, which can lead to large asymmetries. As an example, in the LRSM, asymmetries larger than 50% are possible even when radiative decay rate measurements agree with SM predictions.
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References
How the literature uses it
30 arXiv papers cite this in 41 sentences
Papers citing it · 35 sentences without a confident label
Compares with it 1 paper
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Comparing the experimental values with theoretical predictions [ref] [ref] [ref] it is clear that larger data samples are required before conclusions can be drawn.
Exploiting the width difference in B_s -> phi gamma · Introduction · 0.90
Cites it as background 5 papers
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Two types of methods to determine photon polarisation have been proposed and carried out: measuring the angular distribution of the recoil particles (see [ref] for theoretical proposals and [ref] for experimental results), and measuring the time-dependent asymmetry (Refs. [ref] and [ref] for theory and experiment, respectively).
The time-dependent $CP$ asymmetry in $B^0 \to K_{\rm res} \gamma \to \pi^+ \pi^- K^0_{\scriptscriptstyle S} \gamma$ decays · Introduction · 0.87
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It is well-known that the V-A structure of the weak interaction leaves characteristic traces in the polarisation of weak decays e.g. [ref] .
Parity Doubling as a Tool for Right-handed Current Searches · Introduction · 0.99
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Another interesting observable that probes the $b →s γ$ transition is the time-dependent CP asymmetry in the exclusive $B_d →K^* (→K^0_S π^0) γ$ decay [ref]
Model-independent constraints on new physics in b --> s transitions · $b→sγ$ · 0.80
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