A theory of R(D*, D) anomaly with right-handed currents

Babu, K. S.; Dutta, Bhaskar; Mohapatra, Rabindra N.

doi:10.1007/jhep01(2019)168

Cited by 51 publications

(57 citation statements)

References 124 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: 54%

“…Since the results in [108,109] are very similar, for simplicity, we will consider the analysis of Ref. [109] for [99,100], 3321 gauge model [108,109], GMR analysis [105], and USM-LRSM [107], respectively. See text for details.…”

Section: Phenomenological Analysismentioning

confidence: 99%

“…• A class of LRSM (parity symmetric and asymmetric) that implemented vector-like fermions to generate quark and lepton masses via a universal seesaw mechanism (USM) have been studied in Ref. [107] to explain the anomalies. In the USM-LRSM, the mass of the RH charged gauge boson is given by for the parity asymmetric case [107]), the USM-LRSM is represented by the orange circle in Fig.…”

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%

“…We also analyze the effect of including into account all the charged transition b → cτν τ observables, namely R(J/ψ), P τ (D * ), F L (D * ), R(X c ), and BR(B − c → τ −ν τ ). We present a phenomenological analysis of parameter space allowed by the experimental data and for comparison we include some of the W boson NP realizations that have already been studied in the literature [94,99,100,[103][104][105][107][108][109]. Most of these models were implemented by considering the previous HFLAV averages and, in addition, not all them considered the polarization observables P τ (D * ), F L (D * ); therefore, we explore which of these benchmark models are still favored (or disfavored) by the new b → cτν τ data.…”

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: 54%

Section: Phenomenological Analysismentioning

confidence: 99%

Section: Phenomenological Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

2019

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Neutrino predictions from a left-right symmetric flavored extension of the standard model

Hernández

Kovalenko

Valle

et al. 2019

J. High Energ. Phys.

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We propose a left-right symmetric electroweak extension of the Standard Model based on the ∆ (27) family symmetry. The masses of all electrically charged Standard Model fermions lighter than the top quark are induced by a Universal Seesaw mechanism mediated by exotic fermions. The top quark is the only Standard Model fermion to get mass directly from a tree level renormalizable Yukawa interaction, while neutrinos are unique in that they get calculable radiative masses through a low-scale seesaw mechanism. The scheme has generalized µ − τ symmetry and leads to a restricted range of neutrino oscillations parameters, with a nonzero neutrinoless double beta decay amplitude lying at the upper ranges generically associated to normal and inverted neutrino mass ordering.

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D* polarization vs. $$ {R}_{D^{\left(\ast \right)}} $$ anomalies in the leptoquark models

Iguro

Kitahara

Omura

et al. 2019

J. High Energ. Phys.

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Polarization measurements in $$ \overline{B}\to {D}^{\left(\ast \right)}\tau \overline{\nu} $$ B ¯ → D ∗ τ ν ¯ are useful to check consistency in new physics explanations for the R D and $$ {R}_{D^{*}} $$ R D * anomalies. In this paper, we investigate the D * and τ polarizations and focus on the new physics contributions to the fraction of a longitudinal D * polarization (F L D * ), which is recently measured by the Belle collaboration F L D * = 0.60 ± 0.09, in model-independent manner and in each single leptoquark model (R2, S1 and U1) that can naturally explain the $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ anomalies. It is found that ℬ(B c + → τ + ν) severely restricts deviation from the Standard Model (SM) prediction of F L,SM D * = 0.46±0.04 in the leptoquark models: [0.43, 0.44], [0.42, 0.48], and [0.43, 0.47] are predicted as a range of F L D * for the R2, S1, and U1 leptoquark models, respectively, where the current data of $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ is satisfied at 1σ level. It is also shown that the τ polarization observables can much deviate from the SM predictions. The Belle II experiment, therefore, can check such correlations between $$ {R}_{D^{\left(\ast \right)}} $$ R D ∗ and the polarization observables, and discriminate among the leptoquark models.

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A theory of R(D*, D) anomaly with right-handed currents

Cited by 51 publications

References 124 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

Neutrino predictions from a left-right symmetric flavored extension of the standard model

D* polarization vs. $$ {R}_{D^{\left(\ast \right)}} $$ anomalies in the leptoquark models

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