Baryon-number-violating nucleon and dinucleon decays in a model with large extra dimensions

Girmohanta, Sudhakantha; Shrock, Robert

doi:10.1103/physrevd.101.015017

Cited by 28 publications

(102 citation statements)

References 81 publications

(98 reference statements)

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“…Our present work complements our previous study in [46], where we showed that, in contrast to the analysis in [45], which was performed in a SMEFT framework, some of the operator mediating n-n oscillations in the LRS framework yield no suppression from the extra-dimensional integration, thus rendering them even less suppressed. This motivates further experimental searches for n-n oscillations and resultant matter instability.…”

Section: Introductionsupporting

confidence: 74%

“…We work in the LRS model with large extra dimensions, which is similar to the model used in Ref. [46]. To be selfcontained, we will recapitulate this briefly and direct the reader to refs.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

“…A more general question was asked in Ref. [45], namely in an extra-dimensional framework, can operators having n f 2fold fermions be less suppressed than operators comprising of n f 1 -fold fermions even if n f 2 > n f 1 ? In other words, given the constraint of wave function separation of quarks and leptons in the higher dimensions from single nucleon decay, are other nucleon and dinucleon decay modes suppressed enough so that they agree with the current experimental bounds?…”

Section: Introductionmentioning

confidence: 99%

“…In other words, given the constraint of wave function separation of quarks and leptons in the higher dimensions from single nucleon decay, are other nucleon and dinucleon decay modes suppressed enough so that they agree with the current experimental bounds? We explored this question in a Standard Model effective field theory (SMEFT) framework with large extra dimensions and considered various nucleon and dinucleon decay modes [45].…”

Section: Introductionmentioning

confidence: 99%

“…We focus on (a) nucleon decays to trilepton final states with ΔB = −1 and ΔL = −3, and (b) dinucleon decays to dilepton final states with ΔB = −2 and ΔL = −2. These channels are on a different footing than the ones considered in [46], due to different selection rules for the changes in B and L. Non-observation of baryon-number-violating decays has yielded stringent lower bounds on the partial lifetimes for these modes. In order to be consistent with experiments, it is crucial for the theory to satisfy these bounds.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionsupporting

confidence: 74%

Section: Theoretical Frameworkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Effective Leptophilic WIMPs at the e+e− collider

Barman

Bhattacharya

Girmohanta

et al. 2022

J. High Energ. Phys.

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We consider higher-dimensional effective (EFT) operators consisting of fermion dark matter (DM) connecting to Standard Model (SM) leptons upto dimension six. Considering all operators together and assuming the DM to undergo thermal freeze-out, we find out relic density allowed parameter space in terms of DM mass (mχ) and New Physics (NP) scale (Λ) with one loop direct search constraints from XENON1T experiment. Allowed parameter space of the model is probed at the proposed International Linear Collider (ILC) via monophoton signal for both Dirac and Majorana cases, limited by the centre-of-mass energy $$ \sqrt{s} $$ s =1 TeV, where DM mass can be probed within $$ {m}_{\chi }<\frac{\sqrt{s}}{2} $$ m χ < s 2 for the pair production to occur and Λ >$$ \sqrt{s} $$ s for the validity of EFT framework.

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An EFT toolbox for baryon and lepton number violating dinucleon to dilepton decays

2021

J. High Energ. Phys.

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In this paper we systematically consider the baryon (B) and lepton (L) number violating dinucleon to dilepton decays (pp → ℓ+ℓ′+, pn → $$ {\mathrm{\ell}}^{+}\overline{\nu}^{\prime } $$ ℓ + ν ¯ ′ , nn → $$ \overline{\nu}\overline{\nu}^{\prime } $$ ν ¯ ν ¯ ′ ) with ∆B = ∆L = −2 in the framework of effective field theory. We start by constructing a basis of dimension-12 (dim-12) operators mediating such processes in the low energy effective field theory (LEFT) below the electroweak scale. Then we consider their standard model effective field theory (SMEFT) completions upwards and their chiral realizations in baryon chiral perturbation theory (BχPT) downwards. We work to the first nontrivial orders in each effective field theory, collect along the way the matching conditions, and express the decay rates in terms of the Wilson coefficients associated with the dim-12 operators in the SMEFT and the low energy constants pertinent to BχPT. We find the current experimental limits push the associated new physics scale larger than 1 − 3 TeV, which is still accessible to the future collider searches. Through weak isospin symmetry, we find the current experimental limits on the partial lifetime of transitions pp → ℓ+ℓ′+, pn → $$ {\mathrm{\ell}}^{+}\overline{\nu}^{\prime } $$ ℓ + ν ¯ ′ imply stronger limits on nn → $$ \overline{\nu}\overline{\nu}^{\prime } $$ ν ¯ ν ¯ ′ than their existing lower bounds, which are improved by 2−3 orders of magnitude. Furthermore, assuming charged mode transitions are also dominantly generated by the similar dim-12 SMEFT interactions, the experimental limits on pp → e+e+, e+μ+, μ+μ+ lead to stronger limits on pn → $$ {\mathrm{\ell}}_{\alpha}^{+}{\overline{\nu}}_{\beta } $$ ℓ α + ν ¯ β with α, β = e, μ than their existing bounds. Conversely, the same assumptions help us to set a lower bound on the lifetime of the experimentally unsearched mode pp → e+τ+ from that of pn → $$ {e}^{+}{\overline{\nu}}_{\tau } $$ e + ν ¯ τ , i.e., $$ {\Gamma}_{pp\to {e}^{+}{\tau}^{+}}^{-1}\gtrsim 2\times {10}^{34} $$ Γ pp → e + τ + − 1 ≳ 2 × 10 34 yr.

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Baryon-number-violating nucleon and dinucleon decays in a model with large extra dimensions

Cited by 28 publications

References 81 publications

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

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

Effective Leptophilic WIMPs at the e+e− collider

An EFT toolbox for baryon and lepton number violating dinucleon to dilepton decays

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