Vector leptoquark resolution of R and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>R</mml:mi></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">(</mml:mo><mml:mo>⁎</mml:mo><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:msub></mml:math> puzzles

Fajfer, Svjetlana; Košnik, Nejc

doi:10.1016/j.physletb.2016.02.018

Cited by 314 publications

(224 citation statements)

References 61 publications

(86 reference statements)

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“…W gauge bosons [11,14,53,54] 3. Leptoquarks [9,10,12,13,15,16,19,20,42,[55][56][57][58][59][60] Models with charged Higgses lead to (too) large effects in the total B c lifetime [61] and, depending on the coupling structure, can also be disfavored by the q 2 distribution [62][63][64]. Interestingly, if the couplings of the charged Higgs are chosen in such a way that they are compatible with the measured q 2 distribution, these models are ruled out by direct searches [65].…”

Section: Jhep09(2017)040mentioning

confidence: 99%

See 1 more Smart Citation

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Crivellin

Müller

Ota

2017

J. High Energ. Phys.

322

254

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Over the past years, experiments accumulated intriguing hints for new physics (NP) in flavor observables, namely in the anomalous magnetic moment of the muon (a µ ), in R(D ( * ) ) = Br(B → D ( * ) τ ν)/Br(B → D ( * ) ν) and in b → sµ + µ − transitions, which are all at the 3 − 4 σ level. In this article we point out that one can explain the R(D ( * ) ) anomaly using two scalar leptoquarks (LQs) with the same mass and coupling to fermions related via a discrete symmetry: an SU(2) L singlet and an SU(2) L triplet, both with hypercharge Y = −2/3. In this way, potentially dangerous contributions to b → sνν are avoided and non-CKM suppressed effects in R(D ( * ) ) can be generated. This allows for smaller overall couplings to fermions weakening the direct LHC bounds. In our model, R(D ( * ) ) is directly correlated to b → sτ + τ − transitions where an enhancement by orders of magnitude compared to the standard model (SM) is predicted, such that these decay modes are in the reach of LHCb and BELLE II. Furthermore, one can also naturally explain the b → sµ + µ − anomalies (including R(K)) by a C 9 = −C 10 like contribution without spoiling µ − e universality in charged current decays. In this case sizable effects in b → sτ µ transitions are predicted which are again well within the experimental reach. One can even address the longstanding anomaly in a µ , generating a sizable decay rate for τ → µγ. However, we find that out of the three anomalies R(D ( * ) ), b → sµ + µ − and a µ only two (but any two) can be explained simultaneously. We point out that a very similar phenomenology can be achieved using a vector leptoquark SU(2) L singlet with hypercharge 2/3. In this case, no tuning between couplings is necessary, but the model is non-renormalizable.

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Section: Jhep09(2017)040mentioning

confidence: 99%

“…Therefore, it is well motivated to search for a simultaneous explanation of these two anomalies [8][9][10][11][12][13][14][15][16][17][18][19][20]. Furthermore, since a e agrees with the SM prediction, also a µ can be considered as a LFUV quantity and one can address it together with R(D ( * ) ) and/or b → sµ + µ − [13,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Crivellin

Müller

Ota

2017

J. High Energ. Phys.

322

254

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“…Nuisance parameters that can impact the significance of the deviation are the hadronic form factor parameters and uncertainties on subleading Λ QCD /m b suppressed corrections of QCD factorisation. The deviations in the angular observables can be interpreted as signs of NP, most notably new heavy Z gauge bosons [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46] or leptoquarks [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61]. However, the B 0 → K * 0 µ + µ − angular observables can also be affected by contributions from SM cc-loop processes [62][63][64][65], which are part of the Λ QCD /m b corrections.…”

Section: Jhep11(2017)176mentioning

confidence: 99%

Direct determination of Wilson coefficients using B0 → K∗0μ+μ− decays

Hurth

Langenbruch²,

Mahmoudi

2017

J. High Energ. Phys.

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A method to directly determine the Wilson coefficients for rare b → s transitions using B 0 → K * 0 µ + µ − decays in an unbinned maximum likelihood fit is presented. The method has several advantages compared to the conventional determination of the Wilson coefficients from angular observables that are determined in bins of q 2 , the square of the mass of the dimuon system. The method uses all experimental information in a more efficient way and automatically accounts for experimental correlations. Performing pseudoexperiments, we show the improved sensitivity of the proposed method for the Wilson coefficients. We also demonstrate that it will be possible to use the method with the combined Run 1 and 2 data sample taken by the LHCb experiment.

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“…[70,[75][76][77][78][79][80][81][82][83][84]), or by scalar or vector lepto-quarks (e.g. [85][86][87][88][89][90]). At one loop, they can be generated by box diagrams involving new particles (e.g.…”

Section: Bsm Interpretation (L Hofer)mentioning

confidence: 99%

Round table: Flavour anomalies inb→sl⁺l⁻processes

et al. 2017

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Abstract. Precision measurements of flavour observables can provide powerful tests of many extensions of the Standard Model. This contribution covers a range of flavour measurements of b → s� + � − transitions, several of which are in tension with the Standard Model of particle physics, as well as their theoretical interpretation. The basics of the theoretical background are discussed before turning to the main question of the field: whether the anomalies can be explained by QCD effects or whether they may be indicators of effects beyond the Standard Model.

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Vector leptoquark resolution of R and RD(⁎) puzzles

Cited by 314 publications

References 61 publications

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Direct determination of Wilson coefficients using B0 → K∗0μ+μ− decays

Round table: Flavour anomalies inb→sl⁺l⁻processes

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Vector leptoquark resolution of R and RD(⁎) puzzles

Cited by 314 publications

References 61 publications

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Simultaneous explanation of R(D (∗)) and b→sμ + μ −: the last scalar leptoquarks standing

Direct determination of Wilson coefficients using B0 → K∗0μ+μ− decays

Round table: Flavour anomalies inb→sl+l−processes

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Product

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Round table: Flavour anomalies inb→sl⁺l⁻processes