Search for single leptoquark and squark production in electron-photon scattering at 
                $\sqrt{s_{\rm ee}}=189$
               GeV at LEP

Abbiendi, G.; Ainsley, C.; Åkesson, P. F.; Alexander, G.; Allison, J.; Anagnostou, G.; Anderson, K. J.; Arcelli, S.; Asai, S.; Axen, D.; Azuelos, G.; Bailey, I.; Ball, A. H.; Barberio, E.; Barlow, R. J.; Batley, R. J.; Behnke, T.; Bell, K. W.; Bella, G.; Bellerive, A.; Bethke, S.; Biebel, O.; Bloodworth, I. J.; Boeriu, Oana Vickey; Bock, P.; Böhme, J.; Bonacorsi, D.; Boutemeur, M.; Braibant, S.; Brigliadori, L.; Brown, R. M.; Burckhart, H.; Cammin, J.; Carnegie, R. K.; Caron, B.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, D. G.; Clarke, P. E.L.; Clay, E.; Cohen, I.; Couchman, J.; Csilling, Á.; Cuffiani, M.; Dado, S.; Dallavalle, G. M.; Dallison, S.; Roeck, A. De; Wolf, E. A. De; Dervan, P.; Desch, K.; Dienes, B.; Dixit, M. S.; Donkers, M.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Etzion, E.; Fabbri, F.; Felď, L.; Ferrari, P.; Fiedler, F.; Fleck, I.; Ford, M.; Frey, A.; Fürtjes, A.; Futyan, D. I.; Gagnon, P.; Gary, J. W.; Gaycken, G.; Geich-Gimbel, Ch.; Giacomelli, G.; Giacomelli, P.; Glenzinskí, D.; Goldberg, J.; Grandi, C.; Graham, K.; Gross, E.; Grunhaus, J.; Gruwé, M.; Günther, P. O.; Gupta, A.; Hajdú, C.; Hanson, G.; Harder, K.; Harel, A.; Harin-Dirac, M.; Hauschild, M.; Hawkes, C. M.; Hawkings, R. J.; Hemingway, R. J.; Hensel, C.; Herten, G.; Heuer, R. D.; Hill, J. C.; Hoffman, K. D.; Homer, R. J.; Horváth, D.; Hossain, K. R.; Howard, Robert; Hüntemeyer, P.; Igo‐Kemenes, P.; Ishii, K.; Jawahery, A.; Jérémie, H.; Jones, C. R.; Jovanović, P.; Junk, T. R.; Kanaya, N.; Kanzaki, J.; Karapetian, G.; Karlen, D.; Kartvelishvili, V.; Kawagoe, K.; Kawamoto, T.; Keeler, R.; Kellogg, R. G.; Kennedy, B. W.; Kim, D. H.; Klein, K.; Klier, A.; Kluth, S.; Kobayashi, Tatsuo; Kobel, M.; Kokott, T. P.; Komamiya, S.; Kowalewski, R.; Krämer, T.; Kress, T.; Krieger, P.; Krogh, J. von; Krop, D.; Kühl, T.; Küpper, M.; Kyberd, P.; Lafferty, G. D.; Landsman, H.; Lanske, D.; Lawson, I.; Layter, J. G.; Leins, A.; Lellouch, D.; Letts, J.; Levinson, L. J.; Liebisch, R.; Lillich, J.; Littlewood, C.; Lloyd, A. W.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Losty, M. J.; Lu, J.; Ludwig, J.; Macchiolo, A.; Macpherson, A.; Mader, W. F.; Marcellini, S.; Marchant, T. E.; Martin, A. J.; Martín, J. P.; Martı́nez, G.; Mäshimo, T.; Mättig, P.; McDonald, W. J.; McKenna, J. A.; McMahon, T. J.; McPherson, R. A.; Meijers, F.; Mendez-Lorenzo, P.; Menges, W.; Merritt, F. S.; Mes, H.; Michelini, A.; Mihara, S.; Mikenberg, G.; Miller, D. J.; Moêd, S.; Mohr, W.; Montanari, A.; Mori, T.; Nagai, K.; Nakamura, I.; Neal, H. A.; Nisius, R.; O’Neale, S. W.; Oakham, F. G.; Odorici, F.; Oh, A.; Okpara, A.; Oreglia, M. J.; Orito, S.; Pahl, C.; Pásżtor, G.; Pater, J. R.; Patrick, G. N.; Pilcher, J. E.; Pinfold, J. L.; Plane, D. E.; Poli, B.; Polok, J.; Pooth, O.; Quadt, A.; Rabbertz, K.; Rembser, C.; Renkel, P.; Rick, H.; Rodning, N.; Roney, J. M.; Rosati, S.; Roscoe, K.; Rozen, Y.; Runge, K.; Rust, D. R.; Sachs, K.; Saeki, T.; Sahr, O.; Sarkisyan, E. K.G.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharff-Hansen, P.; Schröder, M.; Schumacher, M.; Schwick, C.; Scott, W. G.; Seuster, R.; Shears, T.; Shen, B. C.; Shepherd-Themistocleous, C. H.; Sherwood, P.; Skuja, A.; Smith, A. M.; Snow, G. A.; Sobie, R.; Süldner-Rembold, S.; Spagnolo, S.; Spanò, F.; Sproston, M.; Stahl, A.; Stephens, K.; Stoll, K.; Strom, D.; Ströhmer, R.; Stumpf, L.; Surrow, B.; Talbot, S. D.; Tarem, S.; Taševský, M.; Taylor, R. J.; Teuscher, R. J.; Thomas, J. P.; Thomson, M. A.; Torrence, E.; Toya, D.; Trefzger, T.; Trigger, I. M.; Trócsányi, Z. L.; Tsur, E.; Turner-Watson, M. F.; Ueda, I.; Ujvári, B.; Vachon, B.; Vollmer, C. F.; Vannerem, P.; Verzocchi, M.; Voss, H.; Vossebeld, J. H.; Waller, D.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wengler, T.; Wermes, N.; Wetterling, D.; Wilson, G. W.; Wilson, J. A.; Wyatt, T. R.; Yamashita, Shinji; Zacek, V.; Zer-Zion, D.

doi:10.1007/s100520100859

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…There has been one experimental search at LEP e + e − collider that was performed with the OPAL detector for first generation scalar and vector LQs that relied on the process eq → LQ → eq(νq), where the quark in the initial state originated from a photon that in turn originated from the beam electron. The search was performed at the center-of-mass energy √ s ee of 189 GeV with the 160 pb −1 of data collected [321]. Under the assumption that the coupling of the LQ is larger than √ 4πα em the OPAL Collaboration established lower limits on the LQ mass that ranged from 121 GeV to 175 GeV (149 GeV to 188 GeV) as a function of the branching ratio β of the scalar (vector) LQ state.…”

Section: Eγ 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: Eγ Collider Signaturesmentioning

confidence: 99%

Physics of leptoquarks in precision experiments and at particle colliders

et al. 2016

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“…2 (left). Squark masses below 100 GeV or so are disfavored from direct searches for RPV SUSY at LEP [114,126,127], Tevatron [128,129] and LHC [4,5], and therefore, are not considered here. 4 In addition, the recent search for scalar leptoquarks at the 13 TeV LHC [130] is relevant for our RPV scenario, since λ ijk -couplings also give rise to the same byd kR → e iL u jL which has a branching ratio of 0.5.…”

Section: Event Ratementioning

confidence: 99%

Signatures of Supersymmetry in Neutrino Telescopes

Dev¹

2020

Probing Particle Physics With Neutrino Telescopes

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We review the prospects of probing R-parity violating Supersymmetry (RPV SUSY) at neutrino telescopes using some of the highest energy particles given to us by Nature. The presence of RPV interactions involving ultra-high energy neutrinos with Earth-matter can lead to resonant production of TeV-scale SUSY partners of the SM quarks and leptons (squarks and sleptons), thereby giving rise to potentially anomalous behavior in the event spectrum observed by largevolume neutrino detectors, such as IceCube, as well as balloon-borne cosmic ray experiments, such as ANITA. Using the ultra-high energy neutrino events observed recently at IceCube, with the fact that for a given power-law flux of astrophysical neutrinos, there is no statistically significant deviation in the current data from the Standard Model expectations, we derive robust upper limits on the RPV couplings as a function of the resonantly-produced squark mass, independent of the other unknown model parameters, as long as the squarks decay dominantly to two-body final states involving leptons and quarks through the RPV couplings. Also, we discuss RPV SUSY interpretations of the recent anomalous, upward-going EeV air showers observed at ANITA, in terms of long-lived charged or neutral next-to-lightest SUSY particles.

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Exploring mixed lepton-quark interactions in non-resonant leptoquark production at the LHC

Gonçalves,

Morais,

Onofre

et al. 2023

J. High Energ. Phys.

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Searches for new physics (NP) at particle colliders typically involve multivariate analysis of kinematic distributions of final state particles produced in a decay of a hypothetical NP resonance. Since the pair-production cross-sections mediated by such resonances are strongly suppressed by the NP scale, this analysis becomes less relevant for NP searches for masses of the BSM resonance above 1 TeV. On the other hand, t-channel processes are less sensitive to the mass of the virtual mediator and therefore larger phase-space can be potentially probed as well as the couplings between the NP particles and the Standard Model fields. The fact that transitions between different generations of quarks and leptons may exist, the potential of the search presented in this article can be used, as a reference guide, to enlarge significantly the scope of searches performed at the LHC to flavour off-diagonal channels, in a theoretically consistent approach. In this work, we study non-resonant production of scalar leptoquarks which have been proposed in the literature to provide a potential avenue for radiative generation of neutrino masses, accommodating as well the existing flavour physics data. Final states involving just two muons at the LHC (μ+μ−), are used as a well-motivated case study.

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Search for single leptoquark and squark production in electron-photon scattering at $\sqrt{s_{\rm ee}}=189$ GeV at LEP

Cited by 5 publications

References 23 publications

Physics of leptoquarks in precision experiments and at particle colliders

Physics of leptoquarks in precision experiments and at particle colliders

Signatures of Supersymmetry in Neutrino Telescopes

Exploring mixed lepton-quark interactions in non-resonant leptoquark production at the LHC

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