Upper Bound of Neutrino Masses from Combined Cosmological Observations and Particle Physics Experiments

Loureiro, A.; Cuceu, Andrei; Abdalla, F. B.; Moraes, Bruno; Whiteway, L.; McLeod, Michael; Balan, Sreekumar T.; Lahav, O.; Benoit-Lévy, A.; Manera, Marc; Rollins, R. P.; Xavier, H. S.

doi:10.1103/physrevlett.123.081301

Cited by 83 publications

(62 citation statements)

References 57 publications

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“…We can see a few features from the above results. First of all, since the neutrino mass scale is at most O(eV) [39,40], the contribution from the neutrino mass matrix is negligible for any measurable branching ratios in a collider-type experiment. Second, if we assume the Wilson coefficients associated with the dim-7 operators in SMEFT are similar in size, all of X and Y parameters will be of a similar order of magnitude.…”

Section: Matching Onto Effective Interactions In χPtmentioning

confidence: 99%

Effective field theory approach to lepton number violating decays K±→ π∓l±l±: short-distance contribution

Liao

Wang

2020

J. High Energ. Phys.

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This is a sequel to our recent work [1] in which we calculated the lepton number violating (LNV) K ± decays due to contact dimension-9 (dim-9) quark-lepton effective interactions that are induced at a high energy scale. In this work we investigate the long-distance contribution to the decays arising from the exchange of a neutrino. These decays can probe LNV interactions involving the second generation of fermions that are not reachable in nuclear neutrinoless double-β decays. Our study is completely formulated in the framework of effective field theories (EFTs), from the standard model effective field theory (SMEFT) through the low energy effective field theory (LEFT) to chiral perturbation theory (χPT). We work to the first nontrivial orders in each effective field theory, collect along the way the matching conditions and renormalization group effects, and express the decay branching ratios in terms of the Wilson coefficients associated with the dim-5 and dim-7 operators in SMEFT. Our result is general in that it does not depend on dynamical details of physics at a high scale that induce the effective interactions in SMEFT and in that it does not appeal to any hadronic models. We find that the long-distance contribution overwhelmingly dominates over the contact or short-distance one. Assuming the new physics scale to be around a TeV, the branching ratios are predicted to be below the current experimental upper bounds by several orders of magnitude. 1

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Section: Matching Onto Effective Interactions In χPtmentioning

confidence: 99%

Effective field theory approach to lepton number violating decays K±→ π∓l±l±: short-distance contribution

Liao

Wang

2020

J. High Energ. Phys.

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“…Now we make some numerical analysis. The values of the SM parameters are taken from the Particle Data Group [35]: [39,40], the contribution JHEP03(2020)120 11.7 from the neutrino mass matrix is negligible for any measurable branching ratios in a collidertype experiment. Second, if we assume the Wilson coefficients associated with the dim-7 operators in SMEFT are similar in size, all of X and Y parameters will be of a similar order of magnitude.…”

Section: Jhep03(2020)120mentioning

confidence: 99%

Effective field theory approach to lepton number violating decays $$ {K}^{\pm}\to {\pi}^{\mp }{l}_{\alpha}^{\pm }{l}_{\beta}^{\pm }: $$ long-distance contribution

Liao

Wang

2020

J. High Energ. Phys.

View full text Add to dashboard Cite

This is a sequel to our recent work [1] in which we calculated the lepton number violating (LNV) K ± decays due to contact dimension-9 (dim-9) quark-lepton effective interactions that are induced at a high energy scale. In this work we investigate the longdistance contribution to the decays arising from the exchange of a neutrino. These decays can probe LNV interactions involving the second generation of fermions that are not reachable in nuclear neutrinoless double-β decays. Our study is completely formulated in the framework of effective field theories (EFTs), from the standard model effective field theory (SMEFT) through the low energy effective field theory (LEFT) to chiral perturbation theory (χPT). We work to the first nontrivial orders in each effective field theory, collect along the way the matching conditions and renormalization group effects, and express the decay branching ratios in terms of the Wilson coefficients associated with the dim-5 and dim-7 operators in SMEFT. Our result is general in that it does not depend on dynamical details of physics at a high scale that induce the effective interactions in SMEFT and in that it does not appeal to any hadronic models. We find that the long-distance contribution overwhelmingly dominates over the contact or short-distance one. Assuming the new physics scale to be around a TeV, the branching ratios are predicted to be below the current experimental upper bounds by several orders of magnitude.

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“…The atmospheric mass-squared difference, for example, dictates that at least one neutrino has to be heavier than |∆m 2 32 | 0.05 eV [27]. On the other hand, cosmic surveys limit the sum of masses of the neutrinos to be 0.26 eV [28]. For concreteness, we assume that the largest element of the neutrino mass matrix lies between m ν ∈ (0.05 − 0.…”

Section: The Effective All-singlets Operator O αβ Smentioning

confidence: 99%

Accessible lepton-number-violating models and negligible neutrino masses

et al. 2019

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Lepton-number violation (LNV), in general, implies nonzero Majorana masses for the Standard Model neutrinos. Since neutrino masses are very small, for generic candidate models of the physics responsible for LNV, the rates for almost all experimentally accessible LNV observables -except for neutrinoless double-beta decay -are expected to be exceedingly small. Guided by effective-operator considerations of LNV phenomena, we identify a complete family of models where lepton number is violated but the generated Majorana neutrino masses are tiny, even if the new-physics scale is below 1 TeV. We explore the phenomenology of these models, including charged-lepton flavor-violating phenomena and baryon-number-violating phenomena, identifying scenarios where the allowed rates for µ − → e + -conversion in nuclei are potentially accessible to next-generation experiments. I. INTRODUCTIONLepton number and baryon number are, at the classical level, accidental global symmetries of the renormalizable Standard Model (SM) Lagrangian. * If one allows for generic non-renormalizable operators consistent with the SM gauge symmetries and particle content, lepton number and baryon number will no longer be conserved. Indeed, lepton-number conservation is violated by effective operators of dimension five or higher while baryon-number conservation (sometimes together with lepton number) is violated by effective operators of dimension six or higher. In other words, generically, the addition of new degrees-of-freedom to the SM particle content violates baryon-number and lepton-number conservation.Experimentally, in spite of ambitious ongoing experimental efforts, there is no evidence for the violation of leptonnumber or baryon-number conservation [5]. There are a few different potential explanations for these (negative) experimental results, assuming degrees-of-freedom beyond those of the SM exist. Perhaps the new particles are either very heavy or very weakly coupled in such a way that phenomena that violate lepton-number or baryon-number conservation are highly suppressed. Another possibility is that the new interactions are not generic and that lepton-number or baryon-number conservation are global symmetries of the Beyond-the-Standard-Model Lagrangian. Finally, it is possible that even though baryon number or lepton number are not conserved and the new degrees-of-freedom are neither weakly coupled nor very heavy, only a subset of baryon-number-violating or lepton-number-violating phenomena are within reach of particle physics experiments. This manuscript concentrates on this third option, which we hope to elucidate below.The discovery of nonzero yet tiny neutrino masses is often interpreted as enticing -but certainly not definitive! -indirect evidence for lepton-number-violating new physics. In this case, neutrinos are massive Majorana fermions and one can naturally "explain" why the masses of neutrinos are much smaller than those of all other known massive particles (see, for example, [6-8] for discussions of this point). Searches for th...

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Upper Bound of Neutrino Masses from Combined Cosmological Observations and Particle Physics Experiments

Cited by 83 publications

References 57 publications

Effective field theory approach to lepton number violating decays K±→ π∓l±l±: short-distance contribution

Effective field theory approach to lepton number violating decays K±→ π∓l±l±: short-distance contribution

Effective field theory approach to lepton number violating decays $$ {K}^{\pm}\to {\pi}^{\mp }{l}_{\alpha}^{\pm }{l}_{\beta}^{\pm }: $$ long-distance contribution

Accessible lepton-number-violating models and negligible neutrino masses

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