2019
DOI: 10.1007/jhep07(2019)168
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Revisiting the vector leptoquark explanation of the B-physics anomalies

Abstract: 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… Show more

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Cited by 178 publications
(213 citation statements)
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References 167 publications
(356 reference statements)
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“…As an illustration of the method, we consider in detail the minimally extended MFV scenario that accounts for the present flavour anomalies. Since one of the most promising setups to fit the anomalies is a U 1 leptoquark model [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], one simply needs to consider the spurions which are associated with the fermion currents that the U 1 leptoquark is coupling to (see below). These spurions will be referred to as ∆ QL and ∆ DE in the following.…”
Section: Introductionmentioning
confidence: 99%
“…As an illustration of the method, we consider in detail the minimally extended MFV scenario that accounts for the present flavour anomalies. Since one of the most promising setups to fit the anomalies is a U 1 leptoquark model [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], one simply needs to consider the spurions which are associated with the fermion currents that the U 1 leptoquark is coupling to (see below). These spurions will be referred to as ∆ QL and ∆ DE in the following.…”
Section: Introductionmentioning
confidence: 99%
“…physics lying beyond the SM, have been proposed that could explain the B-decay anomalies, allowing in particular also for violations of LFU. Important specific scenarios are given by leptoquark models [7][8][9][10][11][12], Z models [13][14][15] or Two-Higgs-Doublet models [16][17][18], implying usually a rich phenomenology of patterns and correlations among various observables.…”
Section: Introductionmentioning
confidence: 99%
“…In the limit of vanishing neutrino masses, the size of |V | cannot be unambiguously determined. As discussed below (see also [20]), a good fit of the anomalies in semileptonic B decays is obtained for…”
Section: The U (2) 5 Symmetry In the Smmentioning
confidence: 83%
“…The EFT in (12), with factorized flavor couplings as in (13) and (18), nicely matches the structure generated by integrating out a U 1 vector leptoquark, transforming as (3, 1) 2/3 under the SM gauge group. As noted first in [16], this field provides indeed an excellent mediator to build in a natural, and sufficiently general way, an EFT for semileptonic B decays built on the U (2) 5 flavor symmetry broken only by the leading V q and V spurions (see [20][21][22][23][25][26][27][28][29][30] for other phenomenological analysis of the U 1 leptoquark in B physics).…”
Section: The U (2) 5 Symmetry In the Smmentioning
confidence: 99%
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