Hunting leptoquarks in monolepton searches

We find constraints on R-Parity Violating (RPV) couplings of the minimal supersymmetric standard model, using Drell-Yan differential cross sections at the LHC. Specifically, we look at the constraints on λ LQD c couplings from monolepton and dilepton data published by ATLAS, with either electrons or muons in the final state. Out of the 18 RPV couplings to which the LHC is at least potentially sensitive by this technique, we find new limits on 12 (or 13) of them, for squarks masses above 1 (or 2) TeV. We also show that one can employ our techniques to achieve significantly stronger bounds at a high-luminosity upgrade of the LHC.

show abstract

“…This is different to what was done in Ref [5],. where a flat 15% error was used in the extrapolation to the High Luminosity LHC.…”

contrasting

confidence: 99%

“…The effect of virtual exchange of scalar leptoquarks in DY processes has been studied previously [4,5] and found to provide extremely strong constraints on the parameter space of those leptoquarks. In this paper, we extend those results to the study of RPV squarks and find similarly powerful constraints at the LHC.…”

Section: Introductionmentioning

confidence: 99%

Limits on R -parity-violating couplings from Drell-Yan processes at the LHC

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…For larger Yukawa couplings, Y ∼ O(1), dilepton production with a t-channel leptoquark exchange, as well as single leptoquark production, can be directly probed over vast mass ranges, and provide complementary constraints [81,82]. Very recently it was also pointed out [83] that, for leptoquarks coupling to the first quark generation in particular, monolepton searches can provide bounds equivalent to those from dilepton. In the large mass regime, where QCD direct production saturates, dilepton signatures are particularly effective in constraining the second-generation couplings.…”

Section: Lhc Constraints On the Parameter Spacementioning

confidence: 99%

Constraints on charmphilic solutions to the muon g−2 with leptoquarks

2019

View full text Add to dashboard Cite

We derive constraints from flavor and LHC searches on charmphilic contributions to the muon anomalous magnetic moment with a single leptoquark. Only the scalar leptoquarks S 1 and R 2 are relevant for the present analysis. We find that for S 1 some parameter space remains consistent at 2 σ with the Brookhaven National Laboratory measurement of (g − 2) µ , under the assumption that the left-type coupling between the muon and the charm quark is a free parameter. The surviving parameter space is, on the other hand, going to be probed in its entirety at the LHC with 300 fb −1 of luminosity or less. All other possibilities are excluded by the LHC dimuon search results in combination with several flavor bounds, which together require one to introduce sizable couplings to the top quark to be evaded.

show abstract

“…Explicit heavy mediators are essential to address the compatibility of this class of SM extensions with other low-energy constraints and with high-p T data. Due to the relatively low scale of new physics hinted at by the charged-current anomalies, high-p T constraints are indeed quite relevant [19][20][21][22][23][24][25][26][27]. Given the success of some EFT approaches and simplified models in describing available data, the attention has shifted recently towards the development of more complete (and more complex) models with a consistent ultraviolet (UV) behavior (see in particular [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]).…”

Section: Introductionmentioning

confidence: 99%

Revisiting the vector leptoquark explanation of the B-physics anomalies

Cornella

Fuentes-Martín

Isidori

2019

J. High Energ. Phys.

178

207

View full text Add to dashboard Cite

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.

show abstract

Hunting leptoquarks in monolepton searches

Cited by 47 publications

References 65 publications

Limits on R -parity-violating couplings from Drell-Yan processes at the LHC

Limits on R -parity-violating couplings from Drell-Yan processes at the LHC

Constraints on charmphilic solutions to the muon g−2 with leptoquarks

Revisiting the vector leptoquark explanation of the B-physics anomalies

Contact Info

Product

Resources

About