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The triplet photoproduction on a free electron as a possible way to search for a dark photon
High Energy Physics - Phenomenology · Submitted 6 Nov 2017
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We estimate what value of the parameter $\epsilon$, as a function of the dark photon mass, can be obtained at given number of the measured events.
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The abstract, sentence by sentence
The process of the triplet production on a free electron, $\gamma e^-\to e^+e^-e^-$, has been investigated as a reaction where a dark photon, $A'$, is produced as a virtual state with subsequent decay into a $e^+e^-$-pair. This effect arises due to the so-called kinetic mixing and is characterized by the small parameter $\epsilon$ describing the coupling strength relative to the electric charge e. The search of $A'$ in this process has advantage because the background to the $A'$ signal is pure QED. This QED background is described by eight Feynman diagrams taking into account the identity of final electrons. As concern $A'$, we leave its contribution in Compton-like diagrams only since, in this case, the virtual dark photon is time-like and its propagator has the Breit-Wigner form. So, near the resonance $A'$ can manifest itself. The contribution of $A'$ in Borsellino diagrams is negligible since, in this case, the virtual dark photon is space-like, the $A'$ propagator does not peak and effect is proportional at least to $\epsilon^2$. We calculate the distributions over the invariant masses of the both produced $e^+e^-$ pairs and search for the kinematical region where the Compton-like diagrams contribution is not suppressed as compared with the Borsellino one. We estimate what value of the parameter $\epsilon$, as a function of the dark photon mass, can be obtained at given number of the measured events.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The process of the triplet production on a free electron, $\gamma e^-\to e^+e^-e^-$, has been investigated as a reaction where a dark photon, $A'$, is produced as a virtual state with subsequent decay into a $e^+e^-$-pair. | contribution 0.85 | 0.61 | 0.09 | asserted 0.75 |
| s1 | This effect arises due to the so-called kinetic mixing and is characterized by the small parameter $\epsilon$ describing the coupling strength relative to the electric charge e. | background 0.98 | 0.08 | 0.03 | asserted 1.00 |
| s2 | The search of $A'$ in this process has advantage because the background to the $A'$ signal is pure QED. | background 0.43 | 0.14 | 0.10 | asserted 0.98 |
| s3 | This QED background is described by eight Feynman diagrams taking into account the identity of final electrons. | background 0.52 | 0.20 | 0.02 | asserted 1.00 |
| s4 | As concern $A'$, we leave its contribution in Compton-like diagrams only since, in this case, the virtual dark photon is time-like and its propagator has the Breit-Wigner form. | method 0.71 | 0.51 | 0.06 | asserted 0.96 |
| s5 | So, near the resonance $A'$ can manifest itself. | interpretation 0.78 | 0.17 | 0.11 | hedged possibility 0.90 |
| s6 | The contribution of $A'$ in Borsellino diagrams is negligible since, in this case, the virtual dark photon is space-like, the $A'$ propagator does not peak and effect is proportional at least to $\epsilon^2$. | result 0.28 | 0.60 | 0.08 | asserted 1.00 |
| s7 | We calculate the distributions over the invariant masses of the both produced $e^+e^-$ pairs and search for the kinematical region where the Compton-like diagrams contribution is not suppressed as compared with the Borsellino one. | method 0.75 | 0.94 | 0.10 | asserted 0.93 |
| s8 | We estimate what value of the parameter $\epsilon$, as a function of the dark photon mass, can be obtained at given number of the measured events. | contribution 0.58 | 0.90 | 0.17 | asserted 0.81 |
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Original abstract
The process of the triplet production on a free electron, $\gamma e^-\to e^+e^-e^-$, has been investigated as a reaction where a dark photon, $A'$, is produced as a virtual state with subsequent decay into a $e^+e^-$-pair. This effect arises due to the so-called kinetic mixing and is characterized by the small parameter $\epsilon$ describing the coupling strength relative to the electric charge e. The search of $A'$ in this process has advantage because the background to the $A'$ signal is pure QED. This QED background is described by eight Feynman diagrams taking into account the identity of final electrons. As concern $A'$, we leave its contribution in Compton-like diagrams only since, in this case, the virtual dark photon is time-like and its propagator has the Breit-Wigner form. So, near the resonance $A'$ can manifest itself. The contribution of $A'$ in Borsellino diagrams is negligible since, in this case, the virtual dark photon is space-like, the $A'$ propagator does not peak and effect is proportional at least to $\epsilon^2$. We calculate the distributions over the invariant masses of the both produced $e^+e^-$ pairs and search for the kinematical region where the Compton-like diagrams contribution is not suppressed as compared with the Borsellino one. We estimate what value of the parameter $\epsilon$, as a function of the dark photon mass, can be obtained at given number of the measured events.
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What it cites · 7 sentences without a confident label
Uses the method or tool of 2 papers
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Let us estimate the limits for the parameter $ϵ$ following Refs. [ref] .
New Fixed-Target Experiments to Search for Dark Gauge Forces · Analysis of the dark photon signal · 0.98
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Let us estimate the limits for the parameter $ϵ$ following Refs. [ref] .
Probing a dark photon using rare leptonic kaon and pion decays · Analysis of the dark photon signal · 0.98
Cites as background 18 papers
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The production of the dark photon in the process of the electron scattering on the proton or heavy nucleus has been investigated in Ref. [ref] ( [ref] ) for the experimental conditions of the MAMI (JLab) experiment [ref] ( [ref] ).
Search for a new gauge boson in the $A'$ Experiment (APEX) · Introduction · 0.88
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The production of the dark photon in the process of the electron scattering on the proton or heavy nucleus has been investigated in Ref. [ref] ( [ref] ) for the experimental conditions of the MAMI (JLab) experiment [ref] ( [ref] ).
Study of the discovery potential for hidden photon emission at future electron scattering fixed target experiments · Introduction · 0.88
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The production of the dark photon in the process of the electron scattering on the proton or heavy nucleus has been investigated in Ref. [ref] ( [ref] ) for the experimental conditions of the MAMI (JLab) experiment [ref] ( [ref] ).
Theoretical framework to analyze searches for hidden light gauge bosons in electron scattering fixed target experiments · Introduction · 0.88
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