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doi:10.1103/physrevd.99.012013

Cited by 17 publications

(8 citation statements)

References 46 publications

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“…In general, it could also decay invisibly into other dark particles. These possibilities have stimulated numerous dedicated quests for it, but with negative results so far, leading to bounds on over various ranges of the A mass [1][2][3][4][5][6][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Kaon decays shedding light on massless dark photons

Tandean

2020

Eur. Phys. J. C

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We explore kaon decays with missing energy carried away by a massless dark photon, $${{\overline{\gamma }}}$$ γ ¯ , assumed to have flavor-changing dipole-type couplings to the d and s quarks. We consider in particular the neutral-kaon modes $$K_L\rightarrow \gamma {{\overline{\gamma }}}$$ K L → γ γ ¯ and $$K_L\rightarrow \pi ^0\gamma {{\overline{\gamma }}}$$ K L → π 0 γ γ ¯ and their $$K_S$$ K S counterparts, as well as the charged-kaon channel $$K^+\rightarrow \pi ^+\gamma {{\overline{\gamma }}}$$ K + → π + γ γ ¯ , each of which also has an ordinary photon, $$\gamma $$ γ , in the final state. In addition, we look at $$K_{L,S}\rightarrow \pi ^+\pi ^-{{\overline{\gamma }}}$$ K L , S → π + π - γ ¯ and $$K^+\rightarrow \pi ^+\pi ^0{{\overline{\gamma }}}$$ K + → π + π 0 γ ¯ . Interestingly, the same $$ds{{\overline{\gamma }}}$$ d s γ ¯ interactions give rise to the flavor-changing two-body decays of hyperons with missing energy and are subject to model-independent constraints that can be inferred from the existing hyperon data. Taking this into account, we obtain branching fractions $${{{\mathcal {B}}}}(K_L\rightarrow \gamma {{\overline{\gamma }}})$$ B ( K L → γ γ ¯ ) and $$\mathcal{B}(K_L\rightarrow \pi ^0\gamma {{\overline{\gamma }}})$$ B ( K L → π 0 γ γ ¯ ) which can be as high as $$10^{-3}$$ 10 - 3 and $$10^{-6}$$ 10 - 6 , respectively, one or both of which may be within the sensitivity reach of the KOTO experiment. Furthermore, we find that $${{{\mathcal {B}}}}(K^+\rightarrow \pi ^+\gamma {{\overline{\gamma }}})$$ B ( K + → π + γ γ ¯ ) and $$\mathcal{B}(K^+\rightarrow \pi ^+\pi ^0{{\overline{\gamma }}})$$ B ( K + → π + π 0 γ ¯ ) are allowed to be maximally of order $$10^{-6}$$ 10 - 6 as well, which may be probed by NA62. Complementarily, the hyperon modes can have rates which are potentially accessible by BESIII. Thus, these ongoing experiments could soon be able to offer significant tests on the existence of the massless dark photon.

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Section: Introductionmentioning

confidence: 99%

Kaon decays shedding light on massless dark photons

Tandean

2020

Eur. Phys. J. C

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“…-BES III (IHEP) [252] The BESIII detector at BEPCII operates with variable beam energies in the τ -charm region. BESIII has collected a massive sample of quarkonia, and has performed multiple direct searches for FIPs and searches for rare decays that could be enhanced by FIPs [253][254][255][256], including ψ(3686) → π + π − J/ψ(γ X ), where X decays invisibly. Status: Active.…”

Section: Experiments Dedicated To Fipsmentioning

confidence: 99%

Feebly-interacting particles: FIPs 2020 workshop report

et al. 2021

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With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.

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“…5 As we will see below, such processes, due to the larger energy scales involved, i.e., √ s 10 GeV, in comparison to those above offer the greatest challenge to the dark magnetic dipole moment scenario. Experiments at e + e − flavor factories, e.g., BaBar, Belle, KLOE-2 and BESIII [97][98][99][100][101][102] have performed and will continue to perform searches for these general types of processes in both the visible and invisible DP decay modes. In the case of invisible decays of the DP which are of more interest to us here, the current best constraint arises from BaBar [98]; in the usual KM scenario this requires that < max 10 −3 for DP masses roughly lying in the interesting range m V ∼ 0.1 − 1 GeV.…”

Section: Jhep11(2021)035mentioning

confidence: 99%

Dark moments for the Standard Model?

Rizzo

2021

J. High Energ. Phys.

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If dark matter (DM) interacts with the Standard Model (SM) via the kinetic mixing (KM) portal, it necessitates the existence of portal matter (PM) particles which carry both dark and SM quantum numbers that will appear in vacuum polarization-like loop graphs. In addition to the familiar ∼ eϵQ strength, QED-like interaction for the dark photon (DP), in some setups different loop graphs of these PM states can also induce other coupling structures for the SM fermions that may come to dominate in at least some regions of parameter space regions and which can take the form of ‘dark’ moments, e.g., magnetic dipole-type interactions in the IR, associated with a large mass scale, Λ. In this paper, motivated by a simple toy model, we perform a phenomenological investigation of a possible loop-induced dark magnetic dipole moment for SM fermions, in particular, for the electron. We show that at the phenomenological level such a scenario can not only be made compatible with existing experimental constraints for a significant range of correlated values for Λ and the dark U(1)D gauge coupling, gD, but can also lead to quantitatively different signatures once the DP is discovered. In this setup, assuming complex scalar DM to satisfy CMB constraints, parameter space regions where the DP decays invisibly are found to be somewhat preferred if PM mass limits from direct searches at the LHC and our toy model setup are all taken seriously. High precision searches for, or measurements of, the e+e− → γ + DP process at Belle II are shown to provide some of the strongest future constraints on this scenario.

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Measurement of B(J/ψ→η′e+e−

Cited by 17 publications

References 46 publications

Kaon decays shedding light on massless dark photons

Kaon decays shedding light on massless dark photons

Feebly-interacting particles: FIPs 2020 workshop report

Dark moments for the Standard Model?

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