Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP

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

doi:10.1007/s100520100859

Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP

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

Research output: Contribution to journal › Article › peer-review

Abstract

A search for first generation scalar and vector leptoquarks (LQ) as well as for squarks (q̃)in R-parity violating SUSY models with the direct decay of the q̃ into Standard Model particles has been performed using e +e- collisions collected with the OPAL detector at LEP at an e+e- centre-of-mass energy √See of 189 GeV. The data correspond to an integrated luminosity of about 160 pb -1. The dominant process for this search is eq → LQ/q̄tild; → eq, νq, where a photon, which has been radiated by one of the beam electrons, serves as a source of quarks. The numbers of selected events found in the two decay channels are in agreement with the expectations from Standard Model processes. This result allows to set lower limits at the 95% confidence level on the mass of first generation scalar and vector leptoquarks, and of squarks in R-parity violating SUSY models. For Yukawa couplings λ to fermions larger than √4παem, the mass limits range from 121 GeV/c2 to 175 GeV/c2 (149 GeV/c2 to 188 GeV/c2) depending on the branching ratio α of the scalar (vector) leptoquark state. Furthermore, limits are set on the Yukawa couplings λ for leptoquarks and λ′1jk for squarks, and on β as a function of the scalar leptoquark/squark mass.

Original language	English
Pages (from-to)	1-11
Number of pages	10
Journal	European Physical Journal C
Volume	23
Issue number	1
DOIs	https://doi.org/10.1007/s100520100859
Publication status	Published - Mar 2002

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10.1007/s100520100859

Cite this

Abbiendi, G., Ainsley, C., Akesson, 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., ... Soldner-Rembold, S. (2002). Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP. European Physical Journal C, 23(1), 1-11. https://doi.org/10.1007/s100520100859

@article{e4645212679c4acb9a23cd822cf813ad,

title = "Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP",

abstract = "A search for first generation scalar and vector leptoquarks (LQ) as well as for squarks ({\~q})in R-parity violating SUSY models with the direct decay of the {\~q} into Standard Model particles has been performed using e +e- collisions collected with the OPAL detector at LEP at an e+e- centre-of-mass energy √See of 189 GeV. The data correspond to an integrated luminosity of about 160 pb -1. The dominant process for this search is eq → LQ/{\=q}tild; → eq, νq, where a photon, which has been radiated by one of the beam electrons, serves as a source of quarks. The numbers of selected events found in the two decay channels are in agreement with the expectations from Standard Model processes. This result allows to set lower limits at the 95% confidence level on the mass of first generation scalar and vector leptoquarks, and of squarks in R-parity violating SUSY models. For Yukawa couplings λ to fermions larger than √4παem, the mass limits range from 121 GeV/c2 to 175 GeV/c2 (149 GeV/c2 to 188 GeV/c2) depending on the branching ratio α of the scalar (vector) leptoquark state. Furthermore, limits are set on the Yukawa couplings λ for leptoquarks and λ′1jk for squarks, and on β as a function of the scalar leptoquark/squark mass.",

author = "G. Abbiendi and C. Ainsley and Akesson, {P. F.} and G. Alexander and J. Allison and G. Anagnostou and Anderson, {K. J.} and S. Arcelli and S. Asai and D. Axen and G. Azuelos and I. Bailey and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and Batley, {R. J.} and T. Behnke and Bell, {K. W.} and G. Bella and A. Bellerive and S. Bethke and O. Biebel and Bloodworth, {I. J.} and O. Boeriu and P. Bock and J. Bohme and D. Bonacorsi and M. Boutemeur and S. Braibant and L. Brigliadori and Brown, {R. M.} and Burckhart, {H. J.} and J. Cammin and Carnegie, {R. K.} and B. Caron and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and Clarke, {P. E L} and E. Clay and I. Cohen and J. Couchman and A. Csilling and M. Cuffiani and S. Dado and Dallavalle, {G. M.} and S. Dallison and {de Roeck}, A. and {de Wolf}, {E. A.} and P. Dervan and K. Desch and B. Dienes and Dixit, {M. S.} and M. Donkers and J. Dubbert and E. Duchovni and G. Duckeck and Duerdoth, {I. P.} and E. Etzion and F. Fabbri and L. Feld and P. Ferrari and F. Fiedler and I. Fleck and M. Ford and A. Frey and A. Furtjes and Futyan, {D. I.} and P. Gagnon and Gary, {J. W.} and G. Gaycken and C. Geich-Gimbel and G. Giacomelli and P. Giacomelli and D. Glenzinski and J. Goldberg and C. Grandi and K. Graham and E. Gross and J. Grunhaus and M. Gruw{\'e} and G{\"u}nther, {P. O.} and A. Gupta and C. Hajdu and Hanson, {G. G.} and K. Harder and A. Harel and M. Harin-Dirac and M. Hauschild and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and C. Hensel and G. Herten and Heuer, {R. D.} and Hill, {J. C.} and K. Hoffman and Homer, {R. J.} and D. Horvath and Hossain, {K. R.} and R. Howard and P. H{\"u}ntemeyer and P. Igo-Kemenes and K. Ishii and A. Jawahery and H. Jeremie and Jones, {C. R.} and P. Jovanovic and Junk, {T. R.} and N. Kanaya and J. Kanzaki and G. Karapetian and D. Karlen and V. Kartvelishvili and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and Kim, {D. H.} and K. Klein and A. Klier and S. Kluth and T. Kobayashi and M. Kobel and Kokott, {T. P.} and S. Komamiya and Kowalewski, {R. V.} and T. Kramer and T. Kress and P. Krieger and {von Krogh}, J. and D. Krop and T. Kuhl and M. Kupper and P. Kyberd and Lafferty, {G. D.} and H. Landsman and D. Lanske and I. Lawson and Layter, {J. G.} and A. Leins and D. Lellouch and J. Letts and L. Levinson and R. Liebisch and J. Lillich and C. Littlewood and Lloyd, {A. W.} and Lloyd, {S. L.} and Loebinger, {F. K.} and Long, {G. D.} and Losty, {M. J.} and J. Lu and J. Ludwig and A. Macchiolo and A. Macpherson and W. Mader and S. Marcellini and Marchant, {T. E.} and Martin, {A. J.} and Martin, {J. P.} and G. Martinez and T. Mashimo and P. M{\"a}ttig and McDonald, {W. J.} and J. McKenna and McMahon, {T. J.} and McPherson, {R. A.} and F. Meijers and P. Mendez-Lorenzo and W. Menges and Merritt, {F. S.} and H. Mes and A. Michelini and S. Mihara and G. Mikenberg and Miller, {D. J.} and S. Moed and W. Mohr and A. Montanari and T. Mori and K. Nagai and I. Nakamura and Neal, {H. A.} and R. Nisius and O'Neale, {S. W.} and Oakham, {F. G.} and F. Odorici and A. Oh and A. Okpara and Oreglia, {M. J.} and S. Orito and C. Pahl and G. P{\'a}sztor and Pater, {J. R.} and Patrick, {G. N.} and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and B. Poli and J. Polok and O. Pooth and A. Quadt and K. Rabbertz and C. Rembser and P. Renkel and H. Rick and N. Rodning and Roney, {J. M.} and S. Rosati and K. Roscoe and Y. Rozen and K. Runge and Rust, {D. R.} and K. Sachs and T. Saeki and O. Sahr and Sarkisyan, {E. K G} and C. Sbarra and Schaile, {A. D.} and O. Schaile and P. Scharff-Hansen and M. Schroder and M. Schumacher and C. Schwick and Scott, {W. G.} and R. Seuster and Shears, {T. G.} and Shen, {B. C.} and Shepherd-Themistocleous, {C. H.} and P. Sherwood and A. Skuja and Smith, {A. M.} and Snow, {G. A.} and R. Sobie and S. S{\"u}ldner-Rembold and S. Spagnolo and F. Spano and M. Sproston and A. Stahl and K. Stephens and K. Stoll and D. Strom and R. Strohmer and L. Stumpf and B. Surrow and Talbot, {S. D.} and S. Tarem and M. Tasevsky and Taylor, {R. J.} and R. Teuscher and J. Thomas and Thomson, {M. A.} and E. Torrence and D. Toya and T. Trefzger and I. Trigger and Z. Trocs{\'a}nyi and E. Tsur and Turner-Watson, {M. F.} and I. Ueda and B. Ujvari and B. Vachon and Vollmer, {C. F.} and P. Vannerem and M. Verzocchi and H. Voss and J. Vossebeld and D. Waller and Ward, {C. P.} and Ward, {D. R.} and Watkins, {P. M.} and Watson, {A. T.} and Watson, {N. K.} and Wells, {P. S.} and T. Wengler and N. Wermes and D. Wetterling and Wilson, {G. W.} and Wilson, {J. A.} and Wyatt, {T. R.} and S. Yamashita and V. Zacek and D. Zer-Zion and Stefan Soldner-Rembold",

year = "2002",

month = mar,

doi = "10.1007/s100520100859",

language = "English",

volume = "23",

pages = "1--11",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "1",

}

Abbiendi, G, Ainsley, C, Akesson, PF, Alexander, G, Allison, J, Anagnostou, G, Anderson, KJ, Arcelli, S, Asai, S, Axen, D, Azuelos, G, Bailey, I, Ball, AH, Barberio, E, Barlow, RJ, Batley, RJ, Behnke, T, Bell, KW, Bella, G, Bellerive, A, Bethke, S, Biebel, O, Bloodworth, IJ, Boeriu, O, Bock, P, Bohme, J, Bonacorsi, D, Boutemeur, M, Braibant, S, Brigliadori, L, Brown, RM, Burckhart, HJ, Cammin, J, Carnegie, RK, Caron, B, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Clarke, PEL, Clay, E, Cohen, I, Couchman, J, Csilling, A, Cuffiani, M, Dado, S, Dallavalle, GM, Dallison, S, de Roeck, A, de Wolf, EA, Dervan, P, Desch, K, Dienes, B, Dixit, MS, Donkers, M, Dubbert, J, Duchovni, E, Duckeck, G, Duerdoth, IP, Etzion, E, Fabbri, F, Feld, L, Ferrari, P, Fiedler, F, Fleck, I, Ford, M, Frey, A, Furtjes, A, Futyan, DI, Gagnon, P, Gary, JW, Gaycken, G, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Glenzinski, D, Goldberg, J, Grandi, C, Graham, K, Gross, E, Grunhaus, J, Gruwé, M, Günther, PO, Gupta, A, Hajdu, C, Hanson, GG, Harder, K, Harel, A, Harin-Dirac, M, Hauschild, M, Hawkes, CM, Hawkings, R, Hemingway, RJ, Hensel, C, Herten, G, Heuer, RD, Hill, JC, Hoffman, K, Homer, RJ, Horvath, D, Hossain, KR, Howard, R, Hüntemeyer, P, Igo-Kemenes, P, Ishii, K, Jawahery, A, Jeremie, H, Jones, CR, Jovanovic, P, Junk, TR, Kanaya, N, Kanzaki, J, Karapetian, G, Karlen, D, Kartvelishvili, V, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, Kim, DH, Klein, K, Klier, A, Kluth, S, Kobayashi, T, Kobel, M, Kokott, TP, Komamiya, S, Kowalewski, RV, Kramer, T, Kress, T, Krieger, P, von Krogh, J, Krop, D, Kuhl, T, Kupper, M, Kyberd, P, Lafferty, GD, Landsman, H, Lanske, D, Lawson, I, Layter, JG, Leins, A, Lellouch, D, Letts, J, Levinson, L, Liebisch, R, Lillich, J, Littlewood, C, Lloyd, AW, Lloyd, SL, Loebinger, FK, Long, GD, Losty, MJ, Lu, J, Ludwig, J, Macchiolo, A, Macpherson, A, Mader, W, Marcellini, S, Marchant, TE, Martin, AJ, Martin, JP, Martinez, G, Mashimo, T, Mättig, P, McDonald, WJ, McKenna, J, McMahon, TJ, McPherson, RA, Meijers, F, Mendez-Lorenzo, P, Menges, W, Merritt, FS, Mes, H, Michelini, A, Mihara, S, Mikenberg, G, Miller, DJ, Moed, S, Mohr, W, Montanari, A, Mori, T, Nagai, K, Nakamura, I, Neal, HA, Nisius, R, O'Neale, SW, Oakham, FG, Odorici, F, Oh, A, Okpara, A, Oreglia, MJ, Orito, S, Pahl, C, Pásztor, G, Pater, JR, Patrick, GN, Pilcher, JE, Pinfold, J, Plane, DE, Poli, B, Polok, J, Pooth, O, Quadt, A, Rabbertz, K, Rembser, C, Renkel, P, Rick, H, Rodning, N, Roney, JM, Rosati, S, Roscoe, K, Rozen, Y, Runge, K, Rust, DR, Sachs, K, Saeki, T, Sahr, O, Sarkisyan, EKG, Sbarra, C, Schaile, AD, Schaile, O, Scharff-Hansen, P, Schroder, M, Schumacher, M, Schwick, C, Scott, WG, Seuster, R, Shears, TG, Shen, BC, Shepherd-Themistocleous, CH, Sherwood, P, Skuja, A, Smith, AM, Snow, GA, Sobie, R, Süldner-Rembold, S, Spagnolo, S, Spano, F, Sproston, M, Stahl, A, Stephens, K, Stoll, K, Strom, D, Strohmer, R, Stumpf, L, Surrow, B, Talbot, SD, Tarem, S, Tasevsky, M, Taylor, RJ, Teuscher, R, Thomas, J, Thomson, MA, Torrence, E, Toya, D, Trefzger, T, Trigger, I, Trocsányi, Z, Tsur, E, Turner-Watson, MF, Ueda, I, Ujvari, B, Vachon, B, Vollmer, CF, Vannerem, P, Verzocchi, M, Voss, H, Vossebeld, J, Waller, D, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Wells, PS, Wengler, T, Wermes, N, Wetterling, D, Wilson, GW, Wilson, JA, Wyatt, TR, Yamashita, S, Zacek, V, Zer-Zion, D & Soldner-Rembold, S 2002, 'Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP', European Physical Journal C, vol. 23, no. 1, pp. 1-11. https://doi.org/10.1007/s100520100859

TY - JOUR

T1 - Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP

AU - Abbiendi, G.

AU - Ainsley, C.

AU - Akesson, P. F.

AU - Alexander, G.

AU - Allison, J.

AU - Anagnostou, G.

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PY - 2002/3

Y1 - 2002/3

N2 - A search for first generation scalar and vector leptoquarks (LQ) as well as for squarks (q̃)in R-parity violating SUSY models with the direct decay of the q̃ into Standard Model particles has been performed using e +e- collisions collected with the OPAL detector at LEP at an e+e- centre-of-mass energy √See of 189 GeV. The data correspond to an integrated luminosity of about 160 pb -1. The dominant process for this search is eq → LQ/q̄tild; → eq, νq, where a photon, which has been radiated by one of the beam electrons, serves as a source of quarks. The numbers of selected events found in the two decay channels are in agreement with the expectations from Standard Model processes. This result allows to set lower limits at the 95% confidence level on the mass of first generation scalar and vector leptoquarks, and of squarks in R-parity violating SUSY models. For Yukawa couplings λ to fermions larger than √4παem, the mass limits range from 121 GeV/c2 to 175 GeV/c2 (149 GeV/c2 to 188 GeV/c2) depending on the branching ratio α of the scalar (vector) leptoquark state. Furthermore, limits are set on the Yukawa couplings λ for leptoquarks and λ′1jk for squarks, and on β as a function of the scalar leptoquark/squark mass.

AB - A search for first generation scalar and vector leptoquarks (LQ) as well as for squarks (q̃)in R-parity violating SUSY models with the direct decay of the q̃ into Standard Model particles has been performed using e +e- collisions collected with the OPAL detector at LEP at an e+e- centre-of-mass energy √See of 189 GeV. The data correspond to an integrated luminosity of about 160 pb -1. The dominant process for this search is eq → LQ/q̄tild; → eq, νq, where a photon, which has been radiated by one of the beam electrons, serves as a source of quarks. The numbers of selected events found in the two decay channels are in agreement with the expectations from Standard Model processes. This result allows to set lower limits at the 95% confidence level on the mass of first generation scalar and vector leptoquarks, and of squarks in R-parity violating SUSY models. For Yukawa couplings λ to fermions larger than √4παem, the mass limits range from 121 GeV/c2 to 175 GeV/c2 (149 GeV/c2 to 188 GeV/c2) depending on the branching ratio α of the scalar (vector) leptoquark state. Furthermore, limits are set on the Yukawa couplings λ for leptoquarks and λ′1jk for squarks, and on β as a function of the scalar leptoquark/squark mass.

U2 - 10.1007/s100520100859

DO - 10.1007/s100520100859

M3 - Article

SN - 1434-6044

VL - 23

SP - 1

EP - 11

JO - European Physical Journal C

JF - European Physical Journal C

IS - 1

ER -

Search for single leptoquark and squark production in electron-photon scattering at √See = 189 GeV at LEP

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