Pair production of dark particles in meson decays

Hostert, Matheus; Kaneta, Kunio; Pospelov, Maxim

doi:10.1103/physrevd.102.055016

Cited by 22 publications

(16 citation statements)

References 81 publications

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“…Similarly to the K L → SP decay, the interactions in eq. ( 6) also lead to the exotic eta decay η → SP , which has been identified as a possible source of the scalar S at beam dump experiments [37]. Neglecting η-η mixing, we find…”

Section: A Effective Interactions Of the Scalars And Meson Decay Ratesmentioning

confidence: 55%

Cosmological implications of the KOTO excess

Altmannshofer,

Lehmann,

Profumo

2020

Preprint

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The KOTO experiment has reported an excess of K L → π 0 ν ν events above the standard model prediction, in tension with the Grossman-Nir bound. The GN bound heavily constrains new physics interpretations of an excess in this channel, but another possibility is that the observed events originate from a different process entirely: a decay of the form K L → π 0 X, where X denotes one or more new invisible species.We introduce a class of models to study this scenario with two light scalars playing the role of X, and we examine the possibility that the lighter of the two new states may also account for cosmological dark matter. We show that this species can be produced thermally in the presence of additional interactions apart from those needed to account for the KOTO excess. Conversely, in the minimal version of the model, dark matter must be produced non-thermally. In this case, avoiding overproduction imposes constraints on the structure of the low-energy theory. Moreover, this requirement carries significant implications for the scale of reheating in the early universe, generically preferring a low but observationally-permitted reheating temperature of O(10 MeV). We discuss astrophysical and terrestrial signatures that will allow further tests of this paradigm in the coming years.

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Section: A Effective Interactions Of the Scalars And Meson Decay Ratesmentioning

confidence: 55%

Cosmological implications of the KOTO excess

Altmannshofer,

Lehmann,

Profumo

2020

Preprint

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“…[26,[87][88][89][90], or promptly decay back (at least partly) to the SM, see for example ref. [91]. See also ref.…”

Section: Jhep06(2021)127mentioning

confidence: 93%

Searching for elusive dark sectors with terrestrial and celestial observations

Contino

Max

Mishra

2021

J. High Energ. Phys.

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We consider the possible existence of a SM-neutral and light dark sector coupled to the visible sector through irrelevant portal interactions. Scenarios of this kind are motivated by dark matter and arise in various extensions of the Standard Model. We characterize the dark dynamics in terms of one ultraviolet scale Λuv, at which the exchange of heavy mediator fields generates the portal operators, and by one infrared scale ΛIR, setting the mass gap. At energies ΛIR « E « Λuv the dark sector behaves like a conformal field theory and its phenomenology can be studied model independently. We derive the constraints set on this scenario by high- and low-energy laboratory experiments and by astrophysical observations. Our results are conservative and serve as a minimum requirement that must be fulfilled by the broad class of models satisfying our assumptions, of which we give several examples. The experimental constraints are derived in a manner consistent with the validity of the effective field theory used to define the portal interactions. We find that high-energy colliders give the strongest bounds and exclude UV scales up to a few TeV, but only in specific ranges of the IR scale. The picture emerging from current searches can be taken as a starting point to design a future experimental strategy with broader sensitivity.

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“…While the GN bound is not violated at the fundamental level in the above scenarios, Refs. [609][610][611] pointed out the fundamental violation is realized if X includes multiple particles. The point is that the new particles in the dark sector are generically neutral under the SM gauge groups, so neutral particles such as neutral kaons could decay to the dark sector particles directly, but the similar decay from charged particles would be suppressed even forbidden.…”

Section: Bsm Scenarios Violating Grossman-nir Boundmentioning

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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Pair production of dark particles in meson decays

Cited by 22 publications

References 81 publications

Cosmological implications of the KOTO excess

Cosmological implications of the KOTO excess

Searching for elusive dark sectors with terrestrial and celestial observations

Feebly-interacting particles: FIPs 2020 workshop report

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