Right-handed neutrinos and R(D(∗))

Robinson, D.; Shakya, Bibhushan; Zupan, Jure

doi:10.1007/jhep02(2019)119

Cited by 55 publications

(67 citation statements)

References 61 publications

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“…In this scenario the W is the gauge boson associated with the interaction between the RH quark and RH lepton currents involving a RH sterile neutrino. This RH current interpretation to the R(D ( * ) ) anomalies have been discussed recently in the literature within different NP realizations [62,[106][107][108][109][110][111][112][113]. We plot in Figs.…”

Section: Phenomenological Analysismentioning

confidence: 57%

“…We have also checked that for W masses higher than 1.2 TeV this is still disfavored. However, as discussed in [110], there is a freedom in the flavor structure of the c 23 q , c 3 N couplings and it is possible to get, in general, different values c 23 q = c 3 N that the ones assumed in [109].…”

Section: Phenomenological Analysismentioning

confidence: 99%

“…[33][34][35][36][37]) 1 . On the other hand, particular NP scenarios such as: charged scalars [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62], leptoquarks (both scalar and vector) , extra gauge bosons [47,94,[98][99][100][101][102][103][104][105][106][107][108][109][110][111], right-handed neutrinos [62,[106][107][108][109][110][111][112][113], R-parity violating (RPV) supersymmetric couplings [31,[114][115][116]…”

Section: Introductionmentioning

confidence: 99%

“…It is important to remark that since we are not implementing any NP realization in our analysis, we will get out from our discussion the possible connection with a Z boson that appears in particular UV completions, as done for instance in Refs. [94,103,105,[108][109][110][111].…”

Section: Introductionmentioning

confidence: 99%

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Charged current b→cτν¯τ anomalies in a general W′ boson scenario

2019

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The very recent experimental information obtained from Belle experiment, along with the one accumulated by the BABAR and LHCb experiments have shown the existence of anomalies in the ratios R(D) and R(D * ) associated with the charged current transition b → cτντ . Although the Belle measurements are in agreement with the SM predictions, the new experimental world averages still exhibit a tension. In addition, the D * longitudinal polarization FL(D * ) related with the channel B → D * τντ observed by the Belle and the ratio R(J/ψ) measured by the LHCb also show discrepancies with their corresponding SM estimations. In this work, we present a modelindependent study based on the most general effective Lagrangian that yields to a tree-level effective contribution to the transition b → cτντ induced by a general W gauge boson. Instead of considering any specific new physics (NP) realization, we performed an analysis by considering all the different chiral charges to the charm-bottom and τ -ντ interaction terms with a charged W boson that explain the anomalies. We present a phenomenological study of parameter space allowed by the new experimental b → cτντ data and with the mono-tau signature pp → τ h X + MET at the LHC. For comparison, we include some of the W boson NP realizations that have already been studied in the literature.

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Section: Phenomenological Analysismentioning

confidence: 57%

Section: Phenomenological Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Charged current b→cτν¯τ anomalies in a general W′ boson scenario

2019

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“…TheR 2 leptoquark has also been proposed as a possible explanation of the R D ( * ) anomalies if one introduces a light ν R that fakes the SM ones, as e.g. in [56,106]. We will not consider this possibility here.…”

Section: Constraints On the New Fieldsmentioning

confidence: 99%

Revisiting the vector leptoquark explanation of the B-physics anomalies

Cornella

Fuentes-Martín

Isidori

2019

J. High Energ. Phys.

172

207

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We present a thorough investigation of the vector leptoquark hypothesis for a combined explanation of the B-physics anomalies. We analyze this hypothesis from a twofold perspective, taking into account recent results from B-physics observables and high-p T searches. First, using a simplified model, we determine the general conditions for a successful lowenergy fit in presence of right-handed leptoquark couplings (neglected in previous analyses). Second, we show how these conditions, in particular a sizable 2-3 family mixing, can be achieved in a motivated ultraviolet completion. Our analysis reinforces the phenomenological success of the vector leptoquark hypothesis in addressing the anomalies, and its compatibility with motivated extensions of the Standard Model based on the idea of flavor non-universal gauge interactions. The implications of right-handed leptoquark couplings for a series of key low-energy observables, namely B s → τ τ and τ → µ lepton flavor violating processes, both in τ and in B decays, are discussed in detail. The role of the ultraviolet completion in precisely estimating other low-energy observables, most notably ∆F = 2 amplitudes, is also addressed. also [32,37]).We provide a detailed implementation of the U 1 leptoquark in a renormalizable model based on the (flavor non-universal) gauge group SU (4) 3 × SU (3) 1+2 × SU (2) L × U (1) , which in turn can be embedded in PS 3 [31]. In this context, we complement the simplified-model analysis by including oneloop contributions to low-energy observables (most notably ∆F = 2 amplitudes and dipole operators) which can be reliably computed only within a UV-complete framework.The paper is organized as follows. In Section 2 we present the simplified-model analysis: we introduce the Lagrangian describing the U 1 couplings to SM fermions, and analyze its low-energy limit. We discuss all the observables insensitive to the UV completion (Section 2.2), which are later used to fit low-energy data (Section 2.3). We finally comment on the high-p T constraints (Section 2.4).The UV-complete model is presented and discussed in Section 3: on the model-building side we pay particular attention to the flavor structure of the model (Section 3.2); on the phenomenological side we present complete expressions for the UV-dependent (loop-induced) observables, which were omitted in the low-energy fit (Section 3.3). The results are summarized in Section 4.

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Global Fits of B Decay Anomalies

Altmannshofer

2020

Springer Proceedings in Physics

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Right-handed neutrinos and R(D(∗))

Cited by 55 publications

References 61 publications

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

Revisiting the vector leptoquark explanation of the B-physics anomalies

Global Fits of B Decay Anomalies

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