Colored scalar mediated nucleon decays to an invisible fermion

Fajfer, Svjetlana; Susič, David

doi:10.1103/physrevd.103.055012

Cited by 22 publications

(22 citation statements)

References 60 publications

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“…Since in Model 2 the interaction of Φ with second generation quarks is independent of y ud and y χd , no concrete predictions for hyperon decays can be made, but a sizable hyperon decay rate is possible. The situation is different for Model 1, for which the allowed branching ratio for n → χγ is smaller than ∼ 10 −6 [273]. This is due to the antisymmetric nature of the Yukawa coupling which forbids interactions of Ψ with only first generation quarks, and the stringent flavor constraints from kaon mixing:…”

Section: Discussion: Relevance For the Neutron Decay Anomaly And B-me...mentioning

confidence: 97%

“…The studies [268][269][270] (see also [271][272][273][274]) have highlighted that hadrons could have rather large branching fractions into final states containing light dark baryons, which would appear as missing energy in a detector. It is quite remarkable that, in the light of current data, branching fractions as large as 1% for the neutron and 0.5% for the B meson are allowed if the decays occur into states in the dark sector which carry baryon number.…”

Section: Modelmentioning

confidence: 99%

See 1 more Smart Citation

New Physics Searches at Kaon and Hyperon Factories

Goudzovski¹,

Redigolo²,

Tobioka³

et al. 2022

Preprint

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Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths and the availability of very large datasets. On the other hand, useful complementary information is provided by hyperon decay measurements. We summarize the relevant phenomenological models and the status of the searches in a comprehensive list of kaon and hyperon decay channels. We identify new search strategies for under-explored signatures, and demonstrate that the improved sensitivities from current and nextgeneration experiments could lead to a qualitative leap in the exploration of light dark sectors.

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Section: Discussion: Relevance For the Neutron Decay Anomaly And B-me...mentioning

confidence: 97%

Section: Modelmentioning

confidence: 99%

New Physics Searches at Kaon and Hyperon Factories

Goudzovski¹,

Redigolo²,

Tobioka³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Thinking broadly, we emphasize that dark decay models [21,159,160,163,168], even if they ultimately make a negligible contribution to the neutron lifetime anomaly, nevertheless allow for much larger apparent BNV effects than that permitted from direct searches for explicit BNV. For example, the minimal dark sector model with Φ in the (3, 1) 2/3 representation can mediate n → χγ up to the ∼ 10 −6 level, with a Φ at the TeV scale, opening the possibility for its discovery at the LHC [163]. Moreover, this model permits Λ → χγ, for which there are no direct constraints, and it is possible to trade the size of n → χγ for Λ → χγ, or vice versa, given the existing constraint from D 0 − D0 oscillations [163].…”

Section: Implications Of Apparent Bnvmentioning

confidence: 92%

“…Alternatively, e.g., a Φ with (3, 1) 2/3 would also work [21], though it cannot couple to two first-generation d-like quarks; n → χγ can, however, appear via the strange quark content of the neutron [21] or through a one-loop weak process [163]. In contrast, the realization of the invisible decay n → χφ, with the particle content thus far noted, requires the introduction of another Dirac fermion χ as well [21].…”

Section: Implications Of Apparent Bnvmentioning

confidence: 99%

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

Berryman,

Gardner,

Zakeri

2022

Preprint

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The neutron lifetime anomaly has been used to motivate the introduction of new physics with hidden-sector particles coupled to baryon number, and on which neutron stars provide powerful constraints. Although the neutron lifetime anomaly may eventually prove to be of mundane origin, we use it as motivation for a broader review of the ways that baryon number violation, be it real or apparent, and dark sectors can intertwine and how neutron star observables, both present and future, can constrain them.

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“…In UV complete theories they can be induced via a see-saw like mechanism involving new heavy particles, colored scalars and neutral fermions, with masses ∼ M [33,35]. Hence, for M at few TeV, the underlying theories can be testable at the LHC and future accelerators [35,36]. Operators (3) induce n − n mass mixing (2) with…”

Section: Introductionmentioning

confidence: 99%

Neutron-mirror neutron mixing and neutron stars

et al. 2021

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The oscillation of neutron n into mirror neutron $$n'$$ n ′ , its mass degenerate partner from dark mirror sector, can gradually transform the neutron stars into the mixed stars consisting in part of mirror dark matter. In quark stars $$n-n'$$ n - n ′ transitions are suppressed. We study the structure of mixed stars and derive the mass-radius scaling relations between the configurations of purely neutron star and maximally mixed star (MMS) containing equal amounts of ordinary and mirror components. In particular, we show that the MMS masses can be at most $$M^{\mathrm{max}}_{NS}/\sqrt{2}$$ M NS max / 2 , where $$M^\mathrm{max}_{NS}$$ M NS max is a maximum mass of a pure neutron star allowed by a given equation of state. We evaluate $$n-n'$$ n - n ′ transition rate in neutron stars, and show that various astrophysical limits on pulsar properties exclude the transition times in a wide range $$10^{5}\,\text {year}< \tau _\varepsilon < 10^{15}\,\text {year}$$ 10 5 year < τ ε < 10 15 year . For short transition times, $$\tau _\varepsilon < 10^5$$ τ ε < 10 5 year, the different mixed stars of the same mass can have different radii, depending on their age, which possibility can be tested by the NICER measurements. We also discuss subtleties related with the possible existence of mixed quark stars, and possible implications for the gravitational waves from the neutron star mergers and associated electromagnetic signals.

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Colored scalar mediated nucleon decays to an invisible fermion

Cited by 22 publications

References 60 publications

New Physics Searches at Kaon and Hyperon Factories

New Physics Searches at Kaon and Hyperon Factories

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

Neutron-mirror neutron mixing and neutron stars

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