Combined explanations of B-physics anomalies: the sterile neutrino solution

Azatov, Aleksandr; Barducci, D.; Ghosh, Diptimoy; Marzocca, David; Ubaldi, Lorenzo

doi:10.1007/jhep10(2018)092

Cited by 74 publications

(62 citation statements)

References 177 publications

(198 reference statements)

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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: 56%

“…[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%

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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: 56%

Section: Introductionmentioning

confidence: 99%

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

2019

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“…Refs. [25,26,[38][39][40] highlighting a strong affinity for third generation leptons. The implied departure from universality falls well beyond the SM predictions…”

Section: Experimental Status and Effective Lagrangianmentioning

confidence: 99%

Common explanation to the RK() , RD
Marzo
¹
,
Marzola
²
,
Raidal
³

2019
Phys. Rev. D*
22
1
11
0
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Scalar theories can account for the current R D ( * ) measurements through a vector operatorc L γ µ b LτL γ µ ν L induced at the loop level. Once the vector contribution is considered on top of a subdominant tree-level scalar component, the predicted value of R D ( * ) falls within the 1σ region indicated by the experiments. We explicitly demonstrate this claim in the framework of a three Higgs doublet model extended with GeV scale right-handed neutrinos, by matching the anomalous signal for perturbative values of the involved couplings and respecting the bounds from complementary flavour physics measurements. Remarkably, we furthermore show that the proposed framework can be employed to simultaneously explain also the present R K ( * ) measurement, as well as the deviation in / currently being debated in the literature. These results are obtained by considering the contribution of relatively light right-handed neutrinos which are fundamental in mediating the processes behind the anomalous signals. In this way our findings reveal a new possible connection that links the flavour anomalies to the phenomenology of extended Higgs sector and neutrino physics. [18] D. Bečirević and O. Sumensari, A leptoquark model to accommodate R exp K < R SM K and R exp K * < R SM K * , JHEP 08 (2017) 104, [arXiv:1704.05835].

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“…Such particles, if present, are assumed to be heavy enough such that they do not to play any role in low-energy observables. Vector leptoquark solutions of the B-physics anomalies involving right-handed neutrinos, light enough to fake the SM ones, have been discussed in[55,56].…”

mentioning

confidence: 99%

Revisiting the vector leptoquark explanation of the B-physics anomalies

Cornella

Fuentes-Martín

Isidori

2019

J. High Energ. Phys.

175

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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Combined explanations of B-physics anomalies: the sterile neutrino solution

Cited by 74 publications

References 177 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

Common explanation to the RK() , RD
Marzo
¹
,
Marzola
²
,
Raidal
³

2019
Phys. Rev. D*
22
1
11
0
View full text Add to dashboard Cite

Revisiting the vector leptoquark explanation of the B-physics anomalies

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About

Combined explanations of B-physics anomalies: the sterile neutrino solution

Cited by 74 publications

References 177 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

Common explanation to the RK(*) , RDMarzo1, Marzola2, Raidal3 2019Phys. Rev. D221110View full textAdd to dashboardCite

Revisiting the vector leptoquark explanation of the B-physics anomalies

Contact Info

Product

Resources

About

Common explanation to the RK() , RD
Marzo
¹
,
Marzola
²
,
Raidal
³

2019
Phys. Rev. D*
22
1
11
0
View full text Add to dashboard Cite