Leptoquark pair production at the Fermilab Tevatron: Signal and backgrounds

Dion, B.; Marleau, Luc; Simon, G.G.

doi:10.1103/physrevd.56.479

Cited by 6 publications

(8 citation statements)

References 28 publications

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“…For example, if these are elementary vector bosons associated with the gauge symmetry then the relevant couplings of the pair of vector LQs to a single gluon or a pair of gluons are completely fixed. If that is not the case one can introduce additional parameters to describe the strength of the relevant couplings [423,425,18,426,427,4]. For example, it is common to introduce a single dimensionless parameter κ that is defined through the following interaction term…”

Section: Pp and Pp Collider Signaturesmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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We present a comprehensive review of physics effects generated by leptoquarks (LQs), i.e., hypothetical particles that can turn quarks into leptons and vice versa, of either scalar or vector nature. These considerations include discussion of possible completions of the Standard Model that contain LQ fields. The main focus of the review is on those LQ scenarios that are not problematic with regard to proton stability. We accordingly concentrate on the phenomenology of light leptoquarks that is relevant for precision experiments and particle colliders. Important constraints on LQ interactions with matter are derived from precision low-energy observables such as electric dipole moments, (g − 2) of charged leptons, atomic parity violation, neutral meson mixing, Kaon, B, and D meson decays, etc. We provide a general analysis of indirect constraints on the strength of LQ interactions with the quarks and leptons to make statements that are as model independent as possible. We address complementary constraints that originate from electroweak precision measurements, top, and Higgs physics. The Higgs physics analysis we present covers not only the most recent but also expected results from the Large Hadron Collider (LHC). We finally discuss direct LQ searches. Current experimental situation is summarized and self-consistency of assumptions that go into existing accelerator-based searches is discussed. A progress in making next-to-leading order predictions for both pair and single LQ productions at colliders is also outlined.

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Section: Pp and Pp Collider Signaturesmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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“…1 also shows that the estimated leading order uncertainty for the LHC is indeed too small, while the leading order error band covers the next-to-leading order curve well for the Tevatron. Furthermore, to next-to-leading order different supersymmetric production processes give very consistent uncertainty estimates [5,6,12,13]. Since there is no physics reason why the Tevatron and the LHC cross section should behave any differently as far as the theoretical uncertainty is concerned, it is a good check to see that at the next-to-leading order level the scale dependence is indeed similar for both experiments.…”

Section: Next-to-leading Order Cross Sectionmentioning

confidence: 91%

“…In the absence of R-parity conservation, single supersymmetric particles can be produced, which can extend the reach of colliders [3][4][5]. It is interesting to notice that pair production of scalar top quarks (or sbottoms or scalar leptoquarks) in hadronic colliders is essentially model independent since the squarkgluon interaction is fixed by SU(3) gauge invariance [6]. In contrast, single production takes place via an unknown R-parity violating Yukawa interaction λ.…”

Section: Introductionmentioning

confidence: 99%

Stop-lepton associated production at hadron colliders

2003

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At hadron colliders, the search for R-parity violating supersymmetry can probe scalar masses beyond what is covered by pair production processes. We evaluate the next-toleading order SUSY-QCD corrections to the associated stop or sbottom production with a lepton through R-parity violating interactions. We show that higher order corrections render the theoretical predictions more stable with respect to variations of the renormalization and factorization scales and that the total cross section is enhanced by a factor up to 70% at the Tevatron and 50% at the LHC. We investigate in detail how the heavy supersymmetric states decouple from the next-to-leading order process, which gives rise to a theory with an additional scalar leptoquark. In this scenario the inclusion of higher order QCD corrections increases the Tevatron reach on leptoquark masses by up to 40 GeV and the LHC reach by up to 200 GeV.

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“…The main background to leptoquark pair production at the Tevatron comes from Z * + 2 jets ( Fig.2(a)) in the dielectron channel and from W * + 2 jets ( Fig.2(b)) in the electron plus missing transverse energy channel [15,16,23,24,25].In the latter case, the source of hard electrons comes from the leptonic decay of the gauge bosons while the jets typically arise from gluon radiation from incoming partons. Although potentially large, this background can be reduced by an invariant mass cut on the lepton pair (dielectron case) or a transverse mass cut on the lepton and missing p T (single electron case).…”

Section: Gauge Boson Productionmentioning

confidence: 99%

“…An optimization is carried out by varying kinematic cuts until they maximize the signalto-backgrond ratio. The nature and values of those cuts are based on earlier calculations [15,16,17,23,24]. For instance, in order to reduce the background coming from Drell-Yan processes we impose a cut on the invariant mass of the lepton pair.…”

Section: Selection Cutsmentioning

confidence: 99%

Scalar and vector leptoquark pair production at hadron colliders: Signal and backgrounds

1998

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We perform a systematic analysis of scalar and vector leptoquark pair production at the Fermilab Tevatron and at the CERN LHC. We evaluate signal expectations and background levels for the processes pp(pp) → 2 jets + e + e − and 2 jets + e+ p T . The Monte Carlo event generator ISAJET is used to simulate the experimental conditions at the current ( √ s = 1.8 TeV, L = 100 pb −1 ) and upgraded (L = 2 fb −1 ) Tevatron as well as the LHC ( √ s = 14 TeV, L = 10 fb −1 ). Depending on the luminosity, and assuming a branching ratio B(LQ → eq) = 0.5, we find a discovery reach up to 170 (255) GeV for scalar leptoquarks at the current (upgraded) Tevatron. Similarly, we find vector leptoquarks to be detectable at masses below 300 (400) GeV depending on the coupling. At the LHC, the discovery reach is enhanced to 1 TeV for scalar leptoquarks and to 1.5 TeV for vectors.

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Leptoquark pair production at the Fermilab Tevatron: Signal and backgrounds

Cited by 6 publications

References 28 publications

Physics of leptoquarks in precision experiments and at particle colliders

Physics of leptoquarks in precision experiments and at particle colliders

Stop-lepton associated production at hadron colliders

Scalar and vector leptoquark pair production at hadron colliders: Signal and backgrounds

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