Four-lepton decays of neutral vector mesons

Chen, Wen; Jia, Yu; Mo, Zhewen; Pan, Jichen; Xiong, Xiaonu

doi:10.1103/physrevd.104.094023

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…We also expect a non-vanishing SM background in this case. The four lepton electromagnetic decay of the quarkonia Υ → + − + − has not yet been observed, but they are predicted to have a branching ratio of about 10 −5 [64], from which we estimate BR(Υ → + − + − γ) ∼ 10 −7 for the SM. To avoid this background we can use the same strategies as in section 3.2.…”

Section: Belle IImentioning

confidence: 75%

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(In)Visible signatures of the minimal dark abelian gauge sector

Foguel

Salla

Funchal

2022

J. High Energ. Phys.

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In this paper we study the present and future sensitivities of the rare meson decay facilities KOTO, LHCb and Belle II to a light dark sector of the minimal dark abelian gauge symmetry where a dark Higgs S and a dark photon ZD have masses ≲ 10 GeV. We have explored the interesting scenario where S can only decay to a pair of ZD’s and so contribute to visible or invisible signatures, depending on the life-time of the latter. Our computations show that these accelerator experiments can access the dark Higgs (mass and scalar mixing) and the dark photon (mass and kinetic mixing) parameters in a complementary way. We have also discussed how the CMS measurement of the SM Higgs total decay width and their limit on the Higgs invisible branching ratio can be used to extend the experimental reach to dark photon masses up to ~ 10 GeV, providing at the same time sensitivity to the gauge coupling associated with the broken dark abelian symmetry.

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Section: Belle IImentioning

confidence: 75%

“…In this particular case of vector meson decays, the invariant mass distribution of lepton pairs in the SM would present a slight linear growth in the region 3 < mZ D /GeV < 9 (see figure 5 of ref [64]…”

mentioning

confidence: 99%

(In)Visible signatures of the minimal dark abelian gauge sector

Foguel

Salla

Funchal

2022

J. High Energ. Phys.

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“…This is effective, since the K 0 S particles do not tend to be produced in the same vertex. Additional backgrounds might come from J/ψ → 2µ + 2µ − decays [48], which can be vetoed efficiently for the search for the low-lifetime configurations and will be negligible as soon as a significant lifetime for at least one of the dimuon candidates is required.…”

Section: Jhep11(2022)027 Jhep11(2022)027mentioning

confidence: 99%

Following the muon track of hierarchical sectors at LHCb

Vidal

Mombächer

Ramos

et al. 2022

J. High Energ. Phys.

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This paper reports a study of the experimental signatures of hierarchical sectors beyond the Standard Model characterized by a flavour-violating heavy vector and a set of light pseudo-Goldstone bosons a1,2, spanning a large range of lifetimes. The non-minimal scalar spectrum triggers novel B decays into multiple leptons that would have escaped the reach of current searches. Novel displaced vertex analyses at LHCb are therefore discussed to probe the hierarchical new physics, extending the scope of the tracking system of the detector. Additionally, the reach of the proposed CODEX-b experiment is studied. By exploiting the use of tracks only reconstructed in subsystems of the detector at the high-level LHCb trigger, $$ \mathcal{B}\left({B}_{s}^{0}\to {a}_{1}{a}_{2}\right)<{10}^{-8} $$ ℬ B s 0 → a 1 a 2 < 10 − 8 and ℬ(B+ → K+a1a2) < 10−9 could be reached in the muon channel across seven orders of magnitude in the lifetime of the Goldstone bosons. Correspondingly, heavy-light particle couplings of order ≲ 1 could be tested, potentially ruling out composite Higgs scenarios where the heavy and light sectors couple strongly.

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“…In addition, according to the detector condition at the BESIII [3], the energy cut for each photon is GeV, and the polar angle cut for each final-state particle is…”

Section: J/ψmentioning

confidence: 99%

Study of the rare decay at the BESIII *

Zhang

Wang

2022

Chinese Phys. C

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Two-photon radiative decay process $J/\psi \to 2\gamma+hadrons$ is studied, and the main contribution processes $J/\psi \to 2\gamma + g g g$ and $J/\psi \to 2\gamma + q \bar{q}$ are calculated. With the specific condition at the BESIII, this rare decay process and the main background process $e^{+} e^{-} \to \gamma \gamma + hadrons (q \bar{q})$ are investigated. The results show that the ratio of signal to background can reach 1.24 with the optimized selection criteria at the BESIII. In addition, a few distributions of the signal and background are presented. All the results show that the signal is large enough to be measured in the experiment. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Four-lepton decays of neutral vector mesons

Cited by 6 publications

References 14 publications

(In)Visible signatures of the minimal dark abelian gauge sector

(In)Visible signatures of the minimal dark abelian gauge sector

Following the muon track of hierarchical sectors at LHCb

Study of the rare decay at the BESIII *

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