Rare hyperon decays with missing energy

Tandean, Jusak

doi:10.1007/jhep04(2019)104

Cited by 13 publications

(39 citation statements)

References 64 publications

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“…In the present paper, we extend the analysis of Ref. [11] and entertain the possibility that the invisible pair consists of a spin-0 boson, φ, and its antiparticle,φ, rather than fermions. We assume that the φ field is complex and does not carry any SM gauge charge but is either charged under some symmetry of a dark sector beyond the SM or odd under a Z 2 symmetry which does not influence SM fields.…”

Section: Introductionsupporting

confidence: 53%

“…We will show that the rates of |∆S| = 1 hyperon decays with missing energy can be sizable in the presence of the new interactions, similarly to what happens in the invisible fermion case studied in Ref. [11]. Such a possibility is partly attributable to the fact that these hyperon transitions and their kaon counterparts do not probe the same set of the underlying NP operators.…”

Section: Introductionmentioning

confidence: 54%

“…Subsequently, Ref. [11] explores a more general scenario in which the underlying NP operators involve other Lorentz structures and the pair of invisible particles could be nonstandard spin-1/2 fermions. In this more general possibility, it turns out that the hyperon decays could have rates which are greatly increased relative to the SM expectations, even up to levels potentially detectible by BESIII in the near future [11].…”

Section: Introductionmentioning

confidence: 99%

“…We also make comparisons with the fermionic case examined in Ref. [11], where in the numerical analysis the invisible fermion's mass was assumed to be negligible or zero for simplicity, and furthermore discuss what may happen if it is not negligible. In the latter case, we point out that under certain conditions a few of the hyperon modes are allowed to have rates higher than their counterparts computed in Ref.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionsupporting

confidence: 53%

Section: Introductionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flavor-changing hyperon decays with light invisible bosons

Tandean

2019

Phys. Rev. D

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“…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]. The prospects for BESIII pursuing two-body hyperon decays with a massless dark photon being invisibly emitted are comparatively better provided that their branching fractions are not too small.…”

mentioning

confidence: 95%

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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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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Rare hyperon decays with missing energy

Cited by 13 publications

References 64 publications

Flavor-changing hyperon decays with light invisible bosons

Flavor-changing hyperon decays with light invisible bosons

Searching for dark photons in hyperon decays

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

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