NLO Leptoquark Production and Decay: The Narrow-Width Approximation and Beyond

Abstract

We study the leptoquark model of Buchmüller, Rückl and Wyler, focusing on a particular type of scalar ($R_2$) and vector ($U_1$) leptoquark. The primary aim is to perform the calculations for leptoquark production and decay at next-to-leading order (NLO) to establish the importance of the NLO contributions and, in particular, to determine how effective the narrow-width-approximation (NWA) is at NLO. For both the scalar and vector leptoquarks it is found that the NLO contributions are large, with the larger corrections occurring for the case vector leptoquarks. For the scalar leptoquark it is found that the NWA provides a good approximation for determining the resonant peak, however the NWA is not as effective for the vector leptoquark. For both the scalar and vector leptoquarks there are large contributions away from the resonant peak, which are missing from the NWA results, and these make a significant difference to the total cross-section.

22 pages, 17 figures

References in corpus (6)

• Cornering Scalar Leptoquarks at LHC
• Search for pair production of third-generation scalar leptoquarks and top squarks in proton-proton collisions at sqrt(s) = 8 TeV
• Single Productions of Colored Particles at the LHC: An Example with Scalar Leptoquarks
• Search for second generation scalar leptoquarks in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Narrow-width approximation limitations
• A threshold-improved narrow-width approximation for BSM physics

Cited by in corpus (24)

• Physics of leptoquarks in precision experiments and at particle colliders
• Reading the footprints of the B-meson flavor anomalies
• Leptoquark toolbox for precision collider studies
• Flavorful leptoquarks at hadron colliders
• Combined explanations of $(g-2{)}_{\mu }$, $R_{D^{(\ast )}}$, $R_{K^{(\ast )}}$ anomalies in a two-loop radiative neutrino mass model
• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
• Vector Leptoquarks Beyond Tree Level
• QCD Improved Matching for Semi-Leptonic B Decays with Leptoquarks
• Search for pair production of first and second generation leptoquarks in proton-proton collisions at sqrt(s) = 8 TeV
• Confronting the vector leptoquark hypothesis with new low- and high-energy data
• Revisiting scalar leptoquark at the LHC
• Search for single production of scalar leptoquarks in proton-proton collisions at sqrt(s) = 8 TeV
• Distinguishing signatures of scalar leptoquarks at hadron and muon colliders
• New Physics in $b\to s\mu \mu$: FCC-hh or a Muon Collider?
• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Resonant leptoquark at NLO with POWHEG
• On Drell-Yan production of scalar leptoquarks coupling to heavy-quark flavours
• Scalar leptoquarks at the LHC and flavour anomalies: a comparison of pair-production modes at NLO-QCD
• Next-to-Leading-Order QCD Matching for $\Delta F=2$ Processes in Scalar Leptoquark Models
• Asymmetric Leptoquark Pair Production at LHC
• Third-Family Lepton-Quark Fusion
• Search for pair production of scalar and vector leptoquarks decaying to muons and bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Novel Leptoquark Pair Production at LHC
• Constraining Scalar Doublet and Triplet Leptoquarks with Vacuum Stability and Perturbativity