Global analysis of eeqq contact interactions and future prospects for high energy physics

Żarnecki, Aleksander Filip

doi:10.1007/s100529900186

Cited by 14 publications

(7 citation statements)

References 15 publications

(28 reference statements)

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“…Contact interactions of the form eeqq within the context of ep collider that are due to the LQ exchange have been studied in Refs. [362,363,364,365,366,367,368]. Some of these studies have also included the LEP and Tevatron data as well as other relevant low-energy measurements to place a constraint on the strength of these interactions.…”

Section: Ep 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: Ep Collider Signaturesmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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“…Constraints have previously been compiled 1 , on two quark and two lepton contact interactions [14,15,16,17,18,19,20,21,22,23,24,25] as could arise in strongly coupled models, and in other New Physics scenarios such as leptoquarks [26,27,28,29,30,31,32] and Z ′ s [24,33,34,35,36]. As reviewed in section 2, the most natural basis of four fermion operators depends somewhat on the New Physics scenario.…”

Section: Introductionmentioning

confidence: 99%

Constraints on two-lepton two-quark operators

2010

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Physics from beyond the Standard Model, such as leptoquarks, can induce four fermion operators involving a quark, an anti-quark, a lepton and an anti-lepton. We update the (flavour-dependent) constraints on the coefficients of such interactions, arising from collider searches for contact interactions, meson decays and other rare processes. We then make naive estimates for the magnitude of the coefficients, as could arise in texture models or from inverse hierarchies in the kinetic term coefficients. These "expectations" suggest that rare Kaon decays could be a good place to look for such operators. * E-mail address: s.davidson@ipnl.in2p3.fr 2 We extract bounds from D + s decays, although there is a few σ discrepancy among these decays and lattice results, which has been discussed in leptoquark models [47].3 So the ǫ V −A ǫ S+P interefence term, which is included to make the decay rate self-consistent, will not be used to set bounds.4

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“…If the colliders' subprocess energy is smaller than the compositeness scale, research on compositeness can be performed indirectly through contact interactions. In literature, there are some studies on contact interactions [8,[18][19][20][21][22][23][24][25][26][27]. This paper investigated contact interactions at the leading order (LO) level at Future Circular Collider (FCC) based muon proton colliders.…”

Section: Introductionmentioning

confidence: 99%

“…Using 36 fb −1 data-set at √ s = 13 TeV, the AT-LAS Collaboration puts exclusion limits on the llqq-type contact interaction scale in the qq → ll process [53]. Contact interaction scales of the llqq-type for constructive (destructive) interference are excluded Λ = 35 (28) TeV and below for the right-right model, Λ = 40 (25) TeV and below for the left-left model. The ATLAS Collaboration, also excluded the llqq-type contact interaction scales Λ = 36 (28) TeV and below for the left-right model with constructive (destructive) interference.…”

Section: Introductionmentioning

confidence: 99%

Contact Interactions at Future Circular Collider based Muon-Proton Colliders

Aydın¹,

Günaydın²,

Şahin³

et al. 2021

Preprint

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In recent years, high energy physicists have begun to show interest in such colliders again, introducing new approaches to solving some of the difficulties encountered in muon colliders. An advantageous situation of muon colliders over other lepton and hadron colliders emerges with solutions to these problems. For these reasons, we investigated four-fermion contact interactions at Future Circular Collider-based muon-proton colliders. Regarding the constructive and destructive interferences of contact interactions, we calculated the potentials of the FCC-based muon-proton colliders in terms of compositeness scale discovery, observation, and exclusion limits for the left-left, right-right, left-right, and right-left helicities interaction states. Our calculations have revealed that these colliders are great alternatives for investigating four-fermion contact interactions.

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Global analysis of eeqq contact interactions and future prospects for high energy physics

Cited by 14 publications

References 15 publications

Physics of leptoquarks in precision experiments and at particle colliders

Physics of leptoquarks in precision experiments and at particle colliders

Constraints on two-lepton two-quark operators

Contact Interactions at Future Circular Collider based Muon-Proton Colliders

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