Testing the $R_{D^{(\ast )}}$ Anomaly at the LHeC

Abstract

B-Physics anomalies have recently raised renewed interest in leptoquarks (LQ), predicted in several theoretical frameworks. Under simplifying but conservative assumptions, we show that the current limits from LHC searches together with the requirement to explain the observed value for $R_{D^{(\ast )}}$ constrain the $R_2$ leptoquark mass to be in the range of $800\le m_{R_2}\le 1000$ GeV. We study the search for $R_2$ at the LHeC via its resonance in the $b\tau$ final state by performing a cut-and-count analysis of the signal and the dominant Standard Model backgrounds. We find that the LHeC has an excellent discovery potential for $R_2$ even for couplings to the first generation as small as $\mathcal{O}(10^{-2})$.

arXiv comment12 pages, 6 figures

References in corpus (36)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Herwig++ Physics and Manual
• Herwig 7.0 / Herwig++ 3.0 Release Note
• Physics of leptoquarks in precision experiments and at particle colliders
• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector
• Closing the window on single leptoquark solutions to the $B$-physics anomalies
• Search for additional heavy neutral Higgs and gauge bosons in the ditau final state produced in 36 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^{\ast })$ with a semileptonic tagging method
• Search for heavy Higgs bosons decaying into two tau leptons with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV
• Non-Standard Interactions in Radiative Neutrino Mass Models
• Constraints on scalar leptoquarks from lepton and kaon physics
• Parity and Time-Reversal Violation in Atomic Systems
• Leptoquark toolbox for precision collider studies
• Cornering Scalar Leptoquarks at LHC
• Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
• Unified Framework for $B$-Anomalies, Muon $g-2$, and Neutrino Masses
• Lepton-quark collisions at the Large Hadron Collider
• Precision predictions for scalar leptoquark pair-production at hadron colliders
• Searches for third-generation scalar leptoquarks in $\sqrt{s}$ = 13 TeV pp collisions with the ATLAS detector
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• Limits on scalar leptoquark interactions and consequences for GUTs
• Search for pair production of second-generation leptoquarks at $\sqrt{s}=$ 13 TeV
• Search for pair production of first-generation scalar leptoquarks at $\sqrt{s}=$ 13 TeV
• Searches for scalar leptoquarks and differential cross-section measurements in dilepton-dijet events in proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS experiment
• Hunting scalar leptoquarks with boosted tops and light leptons
• Search for new non-resonant phenomena in high-mass dilepton final states with the ATLAS detector
• Leptoquarks in Oblique Corrections and Higgs Signal Strength: Status and Prospects
• Seeking leptoquarks in IceCube
• Probing Leptoquark and Heavy Neutrino at LHeC
• Signatures of ${\tilde{R}}_2$ class of Leptoquarks at the upcoming $ep$ colliders
• Non-resonant Leptoquark with multigeneration couplings to $\mu \mu jj$ and $\mu \nu jj$ at LHC

Cited by in corpus (1)

• Distinguishing Leptoquarks at the LHC/FCC