Prospects for rare and forbidden hyperon decays at BESIII

Li, Haibo

doi:10.1007/s11467-017-0691-9

Cited by 64 publications

(72 citation statements)

References 109 publications

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“…, 4 × 10 −7 , 8 × 10 −7 , 9 × 10 −7 , and 2.6 × 10 −5 , respectively [11]. Since our decays of concern, B → B ′ γ, are two-body ones, BESIII would have better sensitivity to them, being able to probe them more efficiently than the three-body ones.…”

Section: Decay Modementioning

confidence: 99%

“…The hyperon decays may be searched for in the BESIII experiment, which has produced copious Λ, Σ, Ξ, and Ω hyperons [11]. For their decays with missing energy ( / E) carried away by a pair of invisible particles, the proposed BESIII sensitivity levels for the branching fractions of Λ → n / E,…”

Section: Decay Modementioning

confidence: 99%

“…In this paper, we would like to show that the hyperon sector potentially offers a competitive window to access this coupling. The search for the FCNC decays of hyperons with missing energy ( / E) carried away by a pair of invisible particles, due to the quark transition s → d / E, can expectedly be realized in the BESIII experiment [11] and is complementary to quests for kaon decays with missing energy. The forthcoming results would likely be informative regarding possible NP affecting this transition [12,13].…”

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confidence: 99%

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Searching for dark photons in hyperon decays

Tandean

2020

Phys. Rev. D

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That massless dark photons could exist and have flavor-changing magnetic-dipole couplings to downtype light quarks is an attractive possibility which may be realized in various new-physics scenarios. It is potentially testable not only in kaon processes but also via two-body hyperon decays involving missing energy carried away by the massless dark photon. We explore the latter within a simplified model approach and take into account constraints from the kaon sector. We find that the branching fractions of some of these hyperon modes are allowed to be as high as a few times 10 −4 . Such numbers are likely to be within the sensitivity reaches of ongoing experiments like BESIII and future ones at super charm-tau factories.

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Section: Decay Modementioning

confidence: 99%

Section: Decay Modementioning

confidence: 99%

mentioning

confidence: 99%

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Searching for dark photons in hyperon decays

Tandean

2020

Phys. Rev. D

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“…However, there has never been any search for them as far as we know. Interestingly, there is a recent proposal to measure them in the BESIII experiment [9]. Hence new data on these rare hyperon modes may be forthcoming.…”

Section: Introductionmentioning

confidence: 99%

“…Initial works on the hyperon modes have been done in Refs. [9,10] focusing on NP entering through s → dνν interactions with the same chiral structure as in the SM. Subsequently, Ref.…”

Section: Introductionmentioning

confidence: 99%

Flavor-changing hyperon decays with light invisible bosons

Tandean

2019

Phys. Rev. D

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We consider the strangeness-changing decays of hyperons into another baryon and missing energy which is carried away by a pair of invisible spinless bosons. Pursuing a model-independent approach and taking into account constraints from the kaon sector, we find that these hyperon modes can have large rates, especially if the bosons have parity-odd effective couplings to light quarks. In that case the rates could attain values which are well within the expected reach of the currently running BESIII experiment. Since the branching fractions of hyperon decays with missing energy are tiny in the standard model, observing them at ongoing or upcoming facilities would likely be indicative of new physics. In addition, we show that the kaon restrictions may be weakened or absent if the bosons have nonnegligible mass. Specifically, if the bosons interact with the quarks solely via an axial-vector current, in the mass region from about 115 to 175 MeV the constraints from rare kaon decays no longer apply and a couple of the hyperon modes become the only direct probes of such interactions. We also make comparisons with the previously explored new-physics scenario where the invisible particles are spin-1/2 fermions.

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New physics in s → d semileptonic transitions: rare hyperon vs. kaon decays

Geng

Camalich

Shi

2022

J. High Energ. Phys.

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We investigate the potential of rare hyperon decays to probe the short distance structure in the $$ s\to dv\overline{v} $$ s → dv v ¯ and s → dℓ+ℓ− transitions. Hyperon decays into neutrinos $$ \left({B}_1\to {B}_2v\overline{v}\right) $$ B 1 → B 2 v v ¯ can be reliably predicted by using form factors determined in baryon chiral perturbation theory. Their decay rates are sensitive to different short-distance operators, as compared to their kaon counterparts, and the corresponding branching fractions are in the range of 10−14 ∼ 10−13 in the standard model. In the context of the low-energy effective theory, we find that the anticipated BESIII measurements of the $$ {B}_1\to {B}_2v\overline{v} $$ B 1 → B 2 v v ¯ decays would lead to constraints on new physics in the purely axial vector $$ \overline{d}{\gamma}_{\mu }{\gamma}_5s $$ d ¯ γ μ γ 5 s current that are stronger than the present limits from their kaon siblings $$ K\to \pi \pi v\overline{v} $$ K → ππv v ¯ . On the other hand, although hyperon decays into charged leptons are dominated by long-distance hadronic contributions, angular observable such as the leptonic forward-backward asymmetry is sensitive to the interference between long- and short-distance contributions. We discuss the sensitivity to new physics of a potential measurement of this observable in comparison with observables in the kaon decays KL→ μ+μ− and K+→ π+μ+μ−. We conclude that the current kaon bounds are a few orders of magnitude better than those that could be obtained from Σ+→ pμ+μ− except for two scenarios with new physics in the $$ \left(\overline{d}{\gamma}^{\mu }s\right)\left(\overline{\mathrm{\ell}}{\gamma}_{\mu }{\gamma}_5\mathrm{\ell}\right) $$ d ¯ γ μ s ℓ ¯ γ μ γ 5 ℓ and $$ \left(\overline{d}{\gamma}^{\mu }{\gamma}_5s\right)\left(\overline{\mathrm{\ell}}{\gamma}_{\mu}\mathrm{\ell}\right) $$ d ¯ γ μ γ 5 s ℓ ¯ γ μ ℓ currents. Finally, we point out that the loop effects from renormalization group evolution are important in this context, when relating the low-energy effective field theory to new physics models in the UV.

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Prospects for rare and forbidden hyperon decays at BESIII

Cited by 64 publications

References 109 publications

Searching for dark photons in hyperon decays

Searching for dark photons in hyperon decays

Flavor-changing hyperon decays with light invisible bosons

New physics in s → d semileptonic transitions: rare hyperon vs. kaon decays

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