Light particles with baryon and lepton numbers

Heeck, Julian

doi:10.1016/j.physletb.2020.136043

Cited by 24 publications

(15 citation statements)

References 43 publications

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“…2 would seem to limit its role. 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].…”

Section: Implications Of Apparent Bnvmentioning

confidence: 91%

“…Thus the possibility of apparent baryon violation can be used more broadly, and we note Ref. [159] for a study of the possible decay channels in the presence of light particles with B or L, such as p → π + χ decay, which searches for p → π + ν limit severely, as we show in the next section. Earlier work concerning the possibility of dark neutron decay [160] via a mass-dimension-six "neutron portal" such as uddχ c L /Λ 2 n [158] gives rise to decays such as n → χγ and n → χZ d with Z d → e + e − , though the predicted rates are too slow to explain the neutron lifetime anomaly [21].…”

Section: Implications Of Apparent Bnvmentioning

confidence: 97%

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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.

show abstract

Section: Implications Of Apparent Bnvmentioning

confidence: 91%

Section: Implications Of Apparent Bnvmentioning

confidence: 97%

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

Berryman,

Gardner,

Zakeri

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…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%

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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“…For instance, in a sterile neutrino model, these constraints imply Br(K L → νν) 10 −10 [106], which could possibly be probed by dedicated searches, but is likely out of reach of the strategy described in this paper. On a related note, one can consider models where the dark sector particles carry baryon number, which can then lead to baryon decays with missing energy [107], such as the invisible decay of neutral hyperons [108]. At NA64, this can appear as a missing energy signal if the hyperon is produced by, e.g.…”

Section: B Additional Dark Sectorsmentioning

confidence: 99%

Probing Invisible Vector Meson Decays with NA64 and LDMX

Schuster,

Toro,

Zhou

2021

Preprint

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Electron beam fixed target experiments such as NA64 and LDMX use missing energy-momentum to detect the production of dark matter and other long-lived states. The most studied production mechanism is dark Bremsstrahlung through a vector mediator. In this work, we explore a complementary source of missing energy-momentum signals: Bremsstrahlung photons can convert to hard vector mesons in exclusive photoproduction processes, which then decay to dark matter or other invisible particles, such as neutrinos. We find that existing NA64 data can improve the leading constraints on invisible light vector meson decays, while a future run of LDMX could improve them by up to 5 orders of magnitude. For the examples of a dark photon and a U (1)B gauge boson mediator, accounting for meson decays substantially enhances these experiments' sensitivity, especially to thermal relic dark matter of mass mχ 0.1 GeV.

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Light particles with baryon and lepton numbers

Cited by 24 publications

References 43 publications

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

Neutron Stars with Baryon Number Violation, Probing Dark Sectors

New Physics Searches at Kaon and Hyperon Factories

Probing Invisible Vector Meson Decays with NA64 and LDMX

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