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Author  |
Gninenko, S.N.; Krasnikov, N.V.; Kuleshov, S.; Lyubovitskij, V.E.; Crivelli, P.; Kirpichnikov, D.V.; Molina Bueno, L.; Zhevlakov, A.S.; Sieber, H.; Voronchikhin, I.V. |
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Title |
Probing millicharged particles with NA64μ and LDMX |
Type |
Journal Article |
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Year |
2026 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
86 |
Issue |
2 |
Pages |
140 - 11pp |
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Abstract |
Millicharged particles emerge as compelling candidates in numerous theoretically well-motivated extensions of the Standard Model. These hypothetical particles, characterized by an electric charge that is a small fraction of the elementary charge, have attracted significant attention in contemporary experimental physics. Their potential existence motivates dedicated search strategies across multiple experimental platforms, leveraging their distinctive electromagnetic interactions while evading conventional detection methods. In the present paper we estimated the projected sensitivity of fixed-target experiments, specifically NA64 μand LDMX, to the parameter space of millicharged particles. For the NA64 μexperiment, with an anticipated muon flux of MOT < 10(14), our analysis reveals a detectable mass window of 10 MeV < m(chi) < 150 MeV and charge parameter range 10(-4) less than or similar to is an element of( )less than or similar to 7 x 10(-4). This sensitivity arises from the bremsstrahlung-like missing energy signature μN ->mu N gamma *(-> chi chi<overline>). Furthermore, we evaluate the discovery potential of the LDMX facility, considering its projected electron beam statistics, EOT less than or similar to 2 x 10(16), and energy, E-e similar or equal to 8 GeV. Our results demonstrate that LDMX can probe heavier MCPs in the mass range 250 MeV less than or similar to m(chi )less than or similar to 400 MeV, with sensitivities reaching 10(-3) less than or similar to is an element of( )less than or similar to 1.5 x 10(-3). This parametric window can be accessible through the distinctive invisible decay channel rho -> chi chi<overline>, where rho-meson photo-production gamma N-N rho plays a pivotal role. |
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Address |
[Gninenko, Sergei N.; Krasnikov, N. V.; Kirpichnikov, D. V.; Voronchikhin, I. V.] Inst Nucl Res, Moscow 117312, Russia, Email: dmbrick@gmail.com |
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Publisher |
Springer |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
1434-6044 |
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Notes |
WOS:001688463600001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7065 |
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