Inclusive nucleon decay searches as a frontier of baryon number violation

Heeck, Julian; Takhistov, Volodymyr

doi:10.1103/physrevd.101.015005

Cited by 51 publications

(61 citation statements)

References 130 publications

(188 reference statements)

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“…Experimental bounds are today available for a broad range of baryon-number violating processes [41][42][43]. In particular, inclusive proton (p) decay searches for processes like p → π 0 + + X that involve a neutral pion (π 0 ) and an anti-lepton ( + ) might be of interest if baryon-number violation does not become manifest in a simple two-body decay.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the LCSR approach developed by us in this article should be able to at least provide order-of-magnitude estimates for hadronic matrix elements that enter certain three-body proton decay processes. Such decays could be phenomenologically relevant (see for instance [42]) but only model estimations exist for selected modes [46], making three-body final-state proton decay processes an interesting target of future LQCD studies [47].…”

Section: Introductionmentioning

confidence: 99%

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Light-cone sum rules for proton decay

Haisch

Hala

2021

J. High Energ. Phys.

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We estimate the form factors that parametrise the hadronic matrix elements of proton-to-pion transitions with the help of light-cone sum rules. These form factors are relevant for semi-leptonic proton decay channels induced by baryon-number violating dimension-six operators, as typically studied in the context of grand unified theories. We calculate the form factors in a kinematical regime where the momentum transfer from the proton to the pion is space-like and extrapolate our final results to the regime that is relevant for proton decay. In this way, we obtain estimates for the form factors that show agreement with the state-of-the-art calculations in lattice QCD, if systematic uncertainties are taken into account. Our work is a first step towards calculating more involved proton decay channels where lattice QCD results are not available at present.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light-cone sum rules for proton decay

Haisch

Hala

2021

J. High Energ. Phys.

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“…Since these decays violate B − L by 2 units, they can arise from the VEV of a Δ R field, so minimal operators will involve a single Δ R field. Our analysis here is complementary to analyses using a SMEFT in four-dimensional spacetime such as [73].…”

Section: Extra-dimensional Frameworkmentioning

confidence: 96%

Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions

Girmohanta

2021

Eur. Phys. J. C

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We consider baryon-number-violating nucleon and dinucleon decays to leptonic final states in the context of a left-right symmetric (LRS) model with large extra dimensions. Specifically, we study (a) nucleon to trilepton decays with $$\varDelta B=-1$$ Δ B = - 1 and $$\varDelta L=-3$$ Δ L = - 3 , and (b) dinucleon to dilepton decays with $$\varDelta B=-2$$ Δ B = - 2 and $$\varDelta L=-2$$ Δ L = - 2 . In the LRS model, $$B-L$$ B - L is gauged and is spontaneously broken by a Higgs vacuum expectation value $$v_R$$ v R , which characterizes the scale at which processes violating $$B-L$$ B - L occur. We show that together with the lower bound on $$v_R$$ v R from experimental limits on n-$${\bar{n}}$$ n ¯ oscillations, constraints from searches for other nucleon decay modes imply sufficient suppression of these nucleon to trilepton and dinucleon to dilepton decay modes in this model to agree with experimental bounds.

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“…The nucleon decays with (∆B, ∆L) = (1, −1) have been studied previously in refs. [33,51] from operators in the ψ 4 ϕ 3 and ψ 6 classes. We reduce their operators to a minimal set and in addition include the operators with a D µ or X µν .…”

Section: Class ψ 2 ϕ 2 Dmentioning

confidence: 99%

An explicit construction of the dimension-9 operator basis in the standard model effective field theory

Liao

2020

J. High Energ. Phys.

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We investigate systematically dimension-9 operators in the standard model effective field theory which contains only standard model fields and respects its gauge symmetry. With the help of the Hilbert series approach to classifying operators according to their lepton and baryon numbers and their field contents, we construct the basis of operators explicitly. We remove redundant operators by employing various kinematic and algebraic relations including integration by parts, equations of motion, Schouten identities, Dirac matrix and Fierz identities, and Bianchi identities. We confirm counting of independent operators by analyzing their flavor symmetry relations. All operators violate lepton or baryon number or both, and are thus non-Hermitian. Including Hermitian conjugated operators there are $$ {\left.384\right|}_{\Delta B=0}^{\Delta L=\pm 2}+{\left.10\right|}_{\Delta B=\pm 2}^{\Delta L=0}+{\left.4\right|}_{\Delta B=\pm 1}^{\Delta L=\pm 3}+{\left.236\right|}_{\Delta B=\pm 1}^{\Delta L=\mp 1} $$ 384 Δ B = 0 Δ L = ± 2 + 10 Δ B = ± 2 Δ L = 0 + 4 Δ B = ± 1 Δ L = ± 3 + 236 Δ B = ± 1 Δ L = ∓ 1 operators without referring to fermion generations, and $$ {\left.44874\right|}_{\Delta B=0}^{\Delta L=\pm 2}+{\left.2862\right|}_{\Delta B=\pm 2}^{\Delta L=0}+{\left.486\right|}_{\Delta B=\pm 1}^{\Delta L=\pm 3}+{\left.42234\right|}_{\Delta B=\mp 1}^{\Delta L=\pm 1} $$ 44874 Δ B = 0 Δ L = ± 2 + 2862 Δ B = ± 2 Δ L = 0 + 486 Δ B = ± 1 Δ L = ± 3 + 42234 Δ B = ∓ 1 Δ L = ± 1 operators when three generations of fermions are referred to, where ∆L, ∆B denote the net lepton and baryon numbers of the operators. Our result provides a starting point for consistent phenomenological studies associated with dimension-9 operators.

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Inclusive nucleon decay searches as a frontier of baryon number violation

Cited by 51 publications

References 130 publications

Light-cone sum rules for proton decay

Light-cone sum rules for proton decay

Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions

An explicit construction of the dimension-9 operator basis in the standard model effective field theory

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