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Collider signature of $U_1$ Leptoquark and constraints from $b\to c$ observables
High Energy Physics - Phenomenology · Submitted 13 Aug 2018
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim From our collider analysis we derive the exclusion limits on mass for the $U_1$ leptoquark at 95\% C.L. at the current and future experiment of the Large Hadron Collider.
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The abstract, sentence by sentence
One of the most popular models that is known to be able to solve the lepton flavour universality violating charged ($b\to c$) and neutral current ($b\to s$) anomalies is the Leptoquark Model. In this work we examine the {\it multijet} + $\mET$ collider signature of a vector leptoquark ($U_1$) which has the potential to mediate both the charged and neutral current processes at tree level. From our collider analysis we derive the exclusion limits on mass for the $U_1$ leptoquark at 95\% C.L. at the current and future experiment of the Large Hadron Collider. We also calculate the effect of such a leptoquark in $b\to c$ observables.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | One of the most popular models that is known to be able to solve the lepton flavour universality violating charged ($b\to c$) and neutral current ($b\to s$) anomalies is the Leptoquark Model. | background 1.00 | 0.04 | 0.04 | asserted 0.88 |
| s1 | In this work we examine the {\it multijet} + $\mET$ collider signature of a vector leptoquark ($U_1$) which has the potential to mediate both the charged and neutral current processes at tree level. | contribution 0.96 | 0.78 | 0.06 | hedged possibility 0.86 |
| s2 | From our collider analysis we derive the exclusion limits on mass for the $U_1$ leptoquark at 95\% C.L. at the current and future experiment of the Large Hadron Collider. | result 0.97 | 0.96 | 0.50 | asserted 1.00 |
| s3 | We also calculate the effect of such a leptoquark in $b\to c$ observables. | contribution 0.93 | 0.95 | 0.06 | asserted 0.97 |
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The paper
Original abstract
One of the most popular models that is known to be able to solve the lepton flavour universality violating charged ($b\to c$) and neutral current ($b\to s$) anomalies is the Leptoquark Model. In this work we examine the {\it multijet} + $\mET$ collider signature of a vector leptoquark ($U_1$) which has the potential to mediate both the charged and neutral current processes at tree level. From our collider analysis we derive the exclusion limits on mass for the $U_1$ leptoquark at 95\% C.L. at the current and future experiment of the Large Hadron Collider. We also calculate the effect of such a leptoquark in $b\to c$ observables.
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References
How the literature uses it
26 arXiv papers cite this in 31 sentences
Papers citing it · 22 sentences without a confident label
Cites it as support 1 paper
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In this context, it has been shown that LQs can explain $b→sℓ^+ℓ^-$ data [ref] , $R(D^(*))$ [ref] and/or $a_μ$ [ref] , which makes them prime candidates for extending the SM with new particles.
Scalar Leptoquarks in Leptonic Processes · Introduction · 0.96
Cites it as background 7 papers
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More recent updates on the role of leptoquarks in $B$ anomalies and constraints on their couplings to ordinary matter can be found in Refs. [ref] , while the $(g-2)_μ$ discrepancy is addressed in Refs. [ref] .
Constraints on leptoquarks from lepton-flavour-violating tau-lepton processes · Introduction · 0.89
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Recent discussions can be found in [ref] and also recently in [ref] .
Correlation between $R_{D^{(*)}}$ and top quark FCNC decays in leptoquark models · Introduction · 0.97
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Aside from any UV motivations for their existence, LQs near the weak scale have been well studied in the literature [ref] , and have been frequently appealed to in order to explain various low energy anomalies e.g. in $B$ meson decays [ref] .
Searching for Leptoquarks at Future Muon Colliders · Introduction · 0.88
What it cites · 72 sentences without a confident label
Uses the method or tool of 30 papers
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The events corresponding to the signal and SM backgrounds in our analysis have been generated using Madgraph5 [ref] with the NNPDF3.0 parton distribution functions [ref] .
Parton distributions for the LHC Run II · Collider analysis · 1.00
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The events corresponding to the signal and SM backgrounds in our analysis have been generated using Madgraph5 [ref] with the NNPDF3.0 parton distribution functions [ref] .
The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations · Collider analysis · 1.00
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We use Delphes(v3) [ref] for the corresponding detector level simulation after the showering/hadronisation.
DELPHES 3, A modular framework for fast simulation of a generic collider experiment · Collider analysis · 1.00
Uses data or values from 4 papers
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The cross section used in this analysis for the background process $tt̅$ is 815.96 pb [ref] as calculated with the Top++2.0 program to NNLO in perturbative QCD, with soft-gluon resummation to NNLL order assuming a top quark mass of 173.2 GeV.
Top++: a program for the calculation of the top-pair cross-section at hadron colliders · Collider analysis · 0.94
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[ref] and, for the sake of completion, have been provided in Appendix [ref].
Testing leptoquark models in $\bar B \to D^{(*)} \tau \bar\nu$ · Constraints from $b→cτν_l$ observables · 1.00
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In our current analysis, we use this relaxed as well as a more aggressive bound of $Br(B_c→τν)≤10%$ obtained from the LEP data taken at the Z-peak [ref] .
Constraint on the branching ratio of B_c \to tau nu from LEP1 and consequences for R(D(*)) anomaly · Constraints from $b→cτν_l$ observables · 0.91
Compares with 1 paper
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[ref], we obtained a marginally improved expected limit of 1600 GeV for 13 TeV LHC with 35.9 $fb^-1$ integrated luminosity ($L_int$) compared to the CMS analysis [ref] where the observed (expected) exclusion limit at $95%$ C.L. was 1530 (1460) GeV.
Constraints on models of scalar and vector leptoquarks decaying to a quark and a neutrino at $\sqrt{s}=$ 13 TeV · Collider analysis · 1.00
Cites as background 22 papers
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Apart from the SM particles, a general LQ model[For detailed discussions regarding LQ scenarios, one can look into [ref] .] contains at least two massive neutrinos and twelve LQ particles.
Physics of leptoquarks in precision experiments and at particle colliders · Effective Lagrangian of $U_1$ vector Leptoquark · 0.99
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As such, these particles have extensively been discussed theoretically for over forty years, both from the point of view of their diverse phenomenological aspects [ref] , and specific properties [ref] .
Revisiting the one leptoquark solution to the $R(D^{(\ast)})$ anomalies and its phenomenological implications · Introduction · 0.96
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As such, these particles have extensively been discussed theoretically for over forty years, both from the point of view of their diverse phenomenological aspects [ref] , and specific properties [ref] .
Explaining the $R_{K}$ and $R_{D^{(*)}}$ anomalies with vector leptoquarks · Introduction · 0.96
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