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Missing energy signature from invisible decays of dark photons at the CERN SPS
The dark photon (A′) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible A′ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aimi...
| Autores principales: | , , , |
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| Lenguaje: | eng |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.94.095025 http://cds.cern.ch/record/2149518 |
| _version_ | 1780950442041147392 |
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| author | Gninenko, S.N. Krasnikov, N.V. Kirsanov, M.M. Kirpichnikov, D.V. |
| author_facet | Gninenko, S.N. Krasnikov, N.V. Kirsanov, M.M. Kirpichnikov, D.V. |
| author_sort | Gninenko, S.N. |
| collection | CERN |
| description | The dark photon (A′) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible A′ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for A′→invisible decays with a high-energy electron beam at the CERN SPS (The Super Proton Synchrotron). We show the distinctive distributions of variables that can be used to distinguish the A′→invisible signal from background. The results of the detailed simulation of the detector response for the events with and without A′ emission are presented. The efficiency of the signal event selection is estimated. It is used to evaluate the sensitivity of the experiment and show that it allows us to probe the still unexplored area of the mixing strength 10-6≲ε≲10-2 and masses up to MA′≲1 GeV. The results obtained are compared with the results from other calculations. In the case of the signal observation, a possibility of extraction of the parameters MA′ and ε by using the shape of the missing energy spectrum is discussed. |
| id | cern-2149518 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2016 |
| record_format | invenio |
| spelling | cern-21495182021-05-03T20:13:36Zdoi:10.1103/PhysRevD.94.095025http://cds.cern.ch/record/2149518engGninenko, S.N.Krasnikov, N.V.Kirsanov, M.M.Kirpichnikov, D.V.Missing energy signature from invisible decays of dark photons at the CERN SPShep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyThe dark photon (A′) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible A′ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for A′→invisible decays with a high-energy electron beam at the CERN SPS (The Super Proton Synchrotron). We show the distinctive distributions of variables that can be used to distinguish the A′→invisible signal from background. The results of the detailed simulation of the detector response for the events with and without A′ emission are presented. The efficiency of the signal event selection is estimated. It is used to evaluate the sensitivity of the experiment and show that it allows us to probe the still unexplored area of the mixing strength 10-6≲ε≲10-2 and masses up to MA′≲1 GeV. The results obtained are compared with the results from other calculations. In the case of the signal observation, a possibility of extraction of the parameters MA′ and ε by using the shape of the missing energy spectrum is discussed.The dark photon ($A'$) production through the mixing with the bremsstrahlung photon from the electron scattering off nuclei can be accompanied by the dominant invisible $A'$ decay into dark-sector particles. In this work we discuss the missing energy signature of this process in the experiment NA64 aiming at the search for $A'\to invisible$ decays with a high-energy electron beam at the CERN SPS. We show the distinctive distributions of variables that can be used to distinguish the $A'\to invisible$ signal from background. The results of the detailed simulation of the detector response for the events with and without $A'$ emission are presented. The efficiency of the signal event selection is estimated. It is used to evaluate the sensitivity of the experiment and show that it allows to probe the still unexplored area of the mixing strength $10^{-6}\lesssim \epsilon \lesssim 10^{-2}$ and masses up to $M_{A'} \lesssim 1$ GeV. The results obtained are compared with the results from other calculations. In the case of the signal observation, a possibility of extraction of the parameters $M_{A'}$ and $\epsilon$ by using the missing energy spectrum shape is discussed. We consider as an example the $A'$ with the mass 16.7 MeV and mixing $\epsilon \lesssim 10^{-3}$, which can explain an excess of events recently observed in nuclear transitions of an excited state of $^8$Be. We show that if such $A'$ exists its invisible decay can be observed in NA64 within a month of running, while data accumulated during a few months would allow also to determine the $\epsilon$ and $M_{A'}$ parameters.arXiv:1604.08432oai:cds.cern.ch:21495182016-04-28 |
| spellingShingle | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology Gninenko, S.N. Krasnikov, N.V. Kirsanov, M.M. Kirpichnikov, D.V. Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title | Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title_full | Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title_fullStr | Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title_full_unstemmed | Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title_short | Missing energy signature from invisible decays of dark photons at the CERN SPS |
| title_sort | missing energy signature from invisible decays of dark photons at the cern sps |
| topic | hep-ex Particle Physics - Experiment hep-ph Particle Physics - Phenomenology |
| url | https://dx.doi.org/10.1103/PhysRevD.94.095025 http://cds.cern.ch/record/2149518 |
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