Flavor physics of leptons and dipole moments

Raidal, M.; Schaaf, A. van der; Bigi, I. I.; Mangano, M.; Semertzidis, Y. K.; Abel, Steven; Albino, S.; Antusch, Stefan; Arganda, E.; Bajc, Borut; Banerjee, S.; Biggio, Carla; Blanke, Monika; Bonivento, W.; Branco, G. C.; Bryman, D.; Buras, Andrzej J.; Ceccucci, A.; Chankowski, Piotr H.; Davidson, Sacha; Deandrea, Aldo; DeMille, David; Deppisch, Frank F.; Diaz, M. A.; Duling, Björn; Felcini, M.; Fetscher, W.; Forti, F.; Ghosh, Dilip Kumar; Giffels, M.; Giorgi, M. A.; Giudice, Gian F.; Goudzovskij, E.; Han, Tao; Harris, Philip; Herrero, M. J.; Hisano, Junji; Holt, R. J.; Huitu, Katri; Ibarra, Alejandro; Igonkina, O.; Ilakovac, Amon; Imazato, J.; Isidori, Gino; Joaquim, F. R.; Kadastik, M.; Kajiyama, Yuji; King, Stephen F.; Kirch, K.; Kozlov, M. G.; Krawczyk, Maria; Kress, T.; Lebedev, O. V.; Lusiani, A.; Marchiori, G.; Masiero, A.; Masina, Isabella; Moreau, G.; Mori, T.; Müntel, M.; Neri, N.; Nesti, Fabrizio; Onderwater, C. J. G.; Paradisi, Paride; Petcov, S. T.; Picariello, Marco; Porretti, V.; Poschenrieder, Anton; Pospelov, Maxim; Rebane, L.; Rebelo, M. N.; Ritz, Adam; Roberts, L.; Romanino, Andrea; Roney, J. M.; Rossi, Anna Maria; Rückl, R.; Senjanović, Goran; Serra, N.; Shindou, Tetsuo; Takanishi, Yasutaka; Tarantino, Cecilia; Teixeira, Ana; Torrente-Luján, E.; Turzyński, Krzysztof; Underwood, Thomas E. J.; Vempati, Sudhir K.; Vives, O.

doi:10.1007/978-3-540-95942-7_1

Cited by 10 publications

(11 citation statements)

References 981 publications

(1,224 reference statements)

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“…Thus, although in the see-saw of type II neutrino masses are proportional to the corresponding doubly-charged scalar decays [52,53,80,81], in general they are not closely related and more elaborated models can accommodate both independently of their specific values. At any rate, along this paper our approach to LHC searches will be mainly phenomenological and hence largely model independent.…”

Section: Jhep03(2014)027mentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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Abstract:The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H ±± → l ± l ± , l = e, µ, τ , or gauge bosons, H ±± → W ± W ± ; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H ±± belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the s-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H ±± mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes pp → H ±± H ∓∓ → ± ± W ∓ W ∓ and pp → H ±± H ∓ → ± ± W ∓ Z, = e, µ, implied by the ATLAS and CMS doubly-charged scalar searches.

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Section: Jhep03(2014)027mentioning

confidence: 99%

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Águila

Chala

2014

J. High Energ. Phys.

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“…4 The limit on the strength of this operator from conversion in Titanium is (see Table 3.6 in Ref. [37]):…”

mentioning

confidence: 99%

Lepton Flavor Violation inBDecays?

2015

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The LHCb Collaboration's measurement of R K = B(B + → K + µ + µ − )/B(B + → K + e + e − ) lies 2.6σ below the Standard Model prediction. Several groups suggest this deficit to result from new lepton non-universal interactions of muons. But non-universal leptonic interactions imply lepton flavor violation in B-decays at rates much larger than are expected in the Standard Model. A simple model shows that these rates could lie just below current limits. An interesting consequence of our model, that B(75, is compatible with recent measurements of these rates. We stress the importance of searches for lepton flavor violations, especially for B → Kµe, Kµτ and B s → µe,

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“…Such mixings and the corresponding phenomenology of heavy vector-like lepton doublets were analyzed long ago in different contexts (for a review see [41,42]; for updated limits see [35]). The low-energy effects of these mixings are proportional to y e ab φ /M a or y ν ab χ /M a , and can be made as small as experimentally required by increasing the heavy masses M a , reducing the couplings y e,ν ab , or the VEVs φ , χ .…”

Section: Relevant Phenomenologymentioning

confidence: 99%

Neutrinoless double b decay with small neutrino masses

Águila¹,

Aparici²,

Bhattacharya³

et al. 2013

Proceedings of Proceedings of the Corfu Summer Institute 2012 — PoS(Corfu2012)

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If the only contribution to neutrinoless double beta decay (0νβ β ) are neutrino masses its discovery may be very difficult, especially if neutrinos present a normal hierarchy spectrum. However, this is not the only possibility; 0νβ β can in general produce electrons of either chirality, in contrast with the neutrino induced 0νβ β which predicts two left-handed electrons. Using an effective Lagrangian approach we classify the lepton number violating (LNV) effective operators with two leptons of either chirality but no quarks, ordered according to the magnitude of their contribution to 0νβ β . We point out that, for each of the three chirality assignments, e L e L , e L e R and e R e R , there is only one LNV operator of the corresponding type to lowest order, and these have dimensions 5, 7 and 9, respectively. Neutrino masses are always induced by these extra operators but can be delayed to one (dimension 7) or two loops (dimension 9). Under the assumption that 0νβ β is dominated by the operators of dimension 7 or 9 we find that the scale of new physics should be relatively low ( 30 TeV). We also list the SM additions generating these operators upon integration of the heavy modes, and discuss simple realistic examples of renormalizable theories for each case. The phenomenology of a model giving rise to the dimension 9 operator has been analyzed with some detail: if 0νβ β is going to be seen in the next round of experiments, the doubly charged scalars of the model could be seen at the LHC and lepton flavour violating (LFV) rates could be at the reach of foreseen experiments. Moreover neutrino masses, which arise at two loops, display a very particular structure and are strongly constrained, in fact, sin 2 θ 13 0.008, when µ → eee is required to lie below its present experimental limit.

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Flavor physics of leptons and dipole moments

Cited by 10 publications

References 981 publications

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

LHC bounds on lepton number violation mediated by doubly and singly-charged scalars

Lepton Flavor Violation inBDecays?

Neutrinoless double b decay with small neutrino masses

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