Leptoquarks in lepton-quark collisions

Buchmüller, W.; Rückl, R.; Wyler, D.

doi:10.1016/0370-2693(87)90637-x

Cited by 762 publications

(875 citation statements)

References 7 publications

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“…There are many very different NP scenarios that predict new particle exchanges which can lead to contact interactions below direct production threshold; a partial list of known candidates is: a Z ′ from an extended gauge model [2,3], scalar or vector leptoquarks [2,4], R-parity violating sneutrino(ν) exchange [5], scalar or vector bileptons [6], graviton Kaluza-Klein(KK) towers [7,8] in extra dimensional models [9,10], gauge boson KK towers [11,8], and even string excitations [12]. Of course, there may be many other sources of contact interactions from NP models as yet undiscovered, as was low-scale gravity only a few years ago.…”

Section: Introductionmentioning

confidence: 99%

Unique Identification of Graviton Exchange Effects ine⁺e⁻Collisions

Rizzo¹

2002

J. High Energy Phys.

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Many types of new physics can lead to contact interaction-like modifications in e + e − processes below direct production threshold. We examine the possibility of uniquely identifying the effects of graviton exchange, which are anticipated in many extra dimensional theories, from amongst this large set of models by using the moments of the angular distribution of the final state particles. In the case of the e + e − → ff process we demonstrate that this technique allows for the unique identification of the graviton exchange signature at the 5σ level for mass scales as high as 6 √ s. The extension of this method to the e + e − → W + W − process is also discussed.

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Section: Introductionmentioning

confidence: 99%

Unique Identification of Graviton Exchange Effects ine⁺e⁻Collisions

Rizzo¹

2002

J. High Energy Phys.

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“…The Lagrangians representing the interactions of the F = 0 and F = −2 (F is the fermion number) scalar leptoquarks are [11,12] …”

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confidence: 99%

Atomic parity violation, leptoquarks, and contact interactions

Barger

Cheung

2000

Physics Letters B

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The recent measurement of atomic parity violation in cesium atoms shows a 2.3σ deviation from the standard model prediction. We show that such an effect can be explained by four-fermion contact interactions with specific chiralities or by scalar leptoquarks which couple to the left-handed quarks. For a coupling of electromagnetic strength, the leptoquark mass is inferred to be 1.1 to 1.3 TeV. We also show that these solutions are consistent with all other low-energy and high-energy neutral-current data. 1.Parity violation in the standard model (SM) results from exchanges of weak gauge bosons. In electronhadron neutral-current processes parity violation is due to the vector axial-vector interaction terms in the which is 2.3σ away from the SM prediction.In this Letter, we propose leptoquark solutions to this APV measurement and also solutions with fourfermion contact interactions. We find that the weak-isospin-doublet leptoquark S R 1/2 , which couples to the right-handed electron and left-handed u and d quarks, and the weak-isospin-triplet leptoquark S L 1 , which 1

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“…As illustrated for the example of a scalar leptoquark of zero fermion number in figure 3b [ 11], the leptoquark mass range covered by a search in 20 fb −1 of LHeC data is comparable to that accessed with 100 fb −1 at the LHC. However, since leptoquarks are almost always pair-produced at the LHC, unravelling their potentially complex spectroscopy [ 12] would be difficult. The more easily controlled single production vertex in ep physics allows fermion number to be determined for example from electron beam charge asymmetries, spins from angular decay distributions and chirality from beam polarisation asymmetries [ 3].…”

Section: Rare and Exotic Processesmentioning

confidence: 99%