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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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“…[490,491] and Ref. [492], respectively.) The data sample that was used for analysis corresponded to an integrated luminosity of 5.0 fb −1 .…”

Section: Searches At Pp Collidermentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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“…Leptoquarks decaying into (ej)(ej) and (µj)(µj) have been a focus of LHC leptoquark searches with both Run 1 and Run 2 data [5,6,22,[38][39][40][41][42][43][44][45][46][47][48]. No significant signal has been discovered, and 95% CL upper limits on leptoquark masses are: m Sej ≥ 1.13 TeV [48] and m Sµj ≥ 1.17 GeV [6].…”

Section: B Ej and µJmentioning

confidence: 99%

The leptoquark hunter’s guide: pair production

Díaz

Schmaltz

Zhong

2017

J. High Energ. Phys.

148

173

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Leptoquarks occur in many new physics scenarios and could be the next big discovery at the LHC. The purpose of this paper is to point out that a model-independent search strategy covering all possible leptoquarks is possible and has not yet been fully exploited. To be systematic we organize the possible leptoquark final states according to a leptoquark matrix with entries corresponding to nine experimentally distinguishable leptoquark decays: any of {light-jet, b-jet, top} with any of {neutrino, e/µ, τ }. The 9 possibilities can be explored in a largely model-independent fashion with pair-production of leptoquarks at the LHC. We review the status of experimental searches for the 9 components of the leptoquark matrix, pointing out which 3 have not been adequately covered. We plead that experimenters publish bounds on leptoquark cross sections as functions of mass for as wide a range of leptoquark masses as possible. Such bounds are essential for reliable recasts to general leptoquark models. To demonstrate the utility of the leptoquark matrix approach we collect and summarize searches with the same final states as leptoquark pair production and use them to derive bounds on a complete set of Minimal Leptoquark models which span all possible flavor and gauge representations for scalar and vector leptoquarks.

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“…Indirect limits from searches for new physics in e + e − collisions at LEP by the OPAL [152] and L3 [153] experiments are indicated, as well as the limits from the DØ [154,155] experiment at the Tevatron and from searches by the ATLAS [156] and CMS [157] experiments based on their √ s = 7 TeV data. The limits from hadron colliders are primarily based on searches for LQ pair-production and are independent of the coupling λ.…”

Section: Searches For First Generation Leptoquarksmentioning

confidence: 99%

Review of searches for rare processes and physics beyond the Standard Model at HERA

South

Turcato

2016

Eur. Phys. J. C

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The electron-proton collisions collected by the H1 and ZEUS experiments at HERA comprise a unique particle physics data set, and a comprehensive range of measurements has been performed to provide new insight into the structure of the proton. The high centre of mass energy at HERA has also allowed rare processes to be studied, including the production of W and Z 0 bosons and events with multiple leptons in the final state. The data have also opened up a new domain to searches for physics beyond the Standard Model including contact interactions, leptoquarks, excited fermions and a number of supersymmetric models. This review presents a summary of such results, where the analyses reported correspond to an integrated luminosity of up to 1 fb −1 , representing the complete data set recorded by the H1 and ZEUS experiments.

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Search for Pair Production of Second-Generation Scalar Leptoquarks inppCollisions ats=7 TeV

Cited by 20 publications

References 21 publications

Physics of leptoquarks in precision experiments and at particle colliders

Physics of leptoquarks in precision experiments and at particle colliders

The leptoquark hunter’s guide: pair production

Review of searches for rare processes and physics beyond the Standard Model at HERA

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