Search for a singly produced third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search is presented for a singly produced third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark. Associated production of a leptoquark and a $\tau$ lepton is considered, leading to a final state with a bottom quark and two $\tau$ leptons. The search uses proton-proton collision data at a center-of-mass energy of 13 TeV recorded with the CMS detector, corresponding to an integrated luminosity of 35.9 fb${}^{-1}$. Upper limits are set at 95% confidence level on the production cross section of the third-generation scalar leptoquarks as a function of their mass. From a comparison of the results with the theoretical predictions, a third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark, assuming unit Yukawa coupling ($\lambda$), is excluded for masses below 740 GeV. Limits are also set on $\lambda$ of the hypothesized leptoquark as a function of its mass. Above $\lambda =$ 1.4, this result provides the best upper limit on the mass of a third-generation scalar leptoquark decaying to a $\tau$ lepton and a bottom quark.

Corrected a formatting error in the author list of the XML file. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-17-029 (CMS Public Pages)

References in corpus (53)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Asymptotic formulae for likelihood-based tests of new physics
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations with Parton Shower simulations: the POWHEG method
• Parton distributions for the LHC Run II
• Confidence Level Computation for Combining Searches with Small Statistics
• Dispelling the N^3 myth for the Kt jet-finder
• Top++: a program for the calculation of the top-pair cross-section at hadron colliders
• A Positive-Weight Next-to-Leading-Order Monte Carlo for Heavy Flavour Hadroproduction
• Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions
• Particle-flow reconstruction and global event description with the CMS detector
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Evidence for an excess of B -> D(*) Tau Nu decays
• Vector boson pair production at the LHC
• The CMS trigger system
• TMVA - Toolkit for Multivariate Data Analysis
• Single-top Wt-channel production matched with parton showers using the POWHEG method
• Merging meets matching in MC@NLO
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS
• Measurement of the branching ratio of $\bar{B}\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to $\bar{B}\to D^{(\ast )}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with hadronic tagging at Belle
• Event generator tunes obtained from underlying event and multiparton scattering measurements
• Physics of leptoquarks in precision experiments and at particle colliders
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Measurement of the ratio of branching fractions $\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$
• Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV
• Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at sqrt(s) = 8 TeV
• NLO single-top production matched with shower in POWHEG: s- and t-channel contributions
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• B-physics anomalies: a guide to combined explanations
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Measurement of the branching ratio of ${\bar{B}}^0\to D^{\ast +}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to ${\bar{B}}^0\to D^{\ast +}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with a semileptonic tagging method
• Testing leptoquark models in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Angular analysis and differential branching fraction of the decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• Jet pair production in POWHEG
• New physics in the weak interaction of $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ with one-prong hadronic $\tau$ decays at Belle
• Search for additional neutral MSSM Higgs bosons in the $\tau \tau$ final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Minimally flavored colored scalar in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and the mass matrices constraints
• Reconstruction and identification of tau lepton decays to hadrons and tau neutrino at CMS
• Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle
• Observation of B+ -> Dbar*0 tau+ nu_tau and Evidence for B+ -> Dbar^0 tau+ nu_tau at Belle
• Leptoquark toolbox for precision collider studies
• Search for the third-generation scalar leptoquarks and heavy right-handed neutrinos in final states with two tau leptons and two jets in proton-proton collisions at sqrt(s) = 13 TeV
• LHC constraints and prospects for $S_1$ scalar leptoquark explaining the $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ anomaly
• Search for third-generation scalar leptoquarks decaying to a top quark and a $\tau$ lepton at $\sqrt{s}=$ 13 TeV
• Measurement of the $\mathrm{Z}{\gamma }^{\ast }\to \tau \tau$ cross section in pp collisions at $\sqrt{s}=$ 13 TeV and validation of $\tau$ lepton analysis techniques

Cited by in corpus (24)

• $R_{D^{(\ast )}}$ motivated ${\mathcal{S}}_1$ leptoquark scenarios: Impact of interference on the exclusion limits from LHC data
• Precision predictions for scalar leptoquark pair-production at hadron colliders
• Search for heavy neutrinos and third-generation leptoquarks in hadronic states of two $\tau$ leptons and two jets in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Searching for Leptoquarks at Future Muon Colliders
• The experimental status of direct searches for exotic physics beyond the standard model at the Large Hadron Collider
• 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
• Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Testing Leptoquark/EFT in $\bar{B}\to D^{(\ast )}l\bar{\nu }$ at the LHC
• Unified SU(4) theory for the $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$ anomalies
• Inclusive nonresonant multilepton probes of new phenomena at $\sqrt{s}=$ 13 TeV
• Resonant third-generation leptoquark signatures at the Large Hadron Collider
• Towards ruling out the charged Higgs interpretation of the $R_{D^{(\ast )}}$ anomaly
• Search for new phenomena in $pp$ collisions in final states with tau leptons, $b$-jets, and missing transverse momentum with the ATLAS detector
• Probing Leptoquark and Heavy Neutrino at LHeC
• Signatures of ${\tilde{R}}_2$ class of Leptoquarks at the upcoming $ep$ colliders
• Scalar leptoquark pair production at the LHC: precision predictions in the era of flavour anomalies
• Phenomenology of TeV-scale scalar Leptoquarks in the EFT
• B Anomalies and Leptoquarks at the LHC: Beyond the Lepton-Quark Final State
• From the EFT to the UV: the complete SMEFT one-loop dictionary
• Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies
• Search for leptoquark pair production decaying into $t{e}^{-}\bar{t}{e}^{+}$ or $t{\mu }^{-}\bar{t}{\mu }^{+}$ in multi-lepton final states in $pp$ collisions at 13 TeV with the ATLAS detector
• Search for scalar leptoquarks produced via $\tau$-lepton-quark scattering in pp collisions at $\sqrt{s}$ = 13 TeV
• HFLAV input to the update of the European Strategy for Particle Physics