Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV

G. Abbiendi, C. Ainsley, P. F. Akesson, G. Alexander, J. Allison, P. Amaral, G. Anagnostou, K. J. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, I. Bailey, E. Barberio, T. Barillari, R. J. Barlow, R. J. Batley, P. Bechtle, T. Behnke, K. W. Bell & 206 others P. J. Bell, G. Bella, A. Bellerive, G. Benelli, S. Bethke, O. Biebel, O. Boeriu, P. Bock, M. Boutemeur, S. Braibant, L. Brigliadori, R. M. Brown, K. Buesser, H. J. Burckhart, S. Campana, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, D. G. Charlton, C. Ciocca, A. Csilling, M. Cuffiani, S. Dado, A. de Roeck, E. A. de Wolf, K. Desch, B. Dienes, 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, P. Gagnon, J. W. Gary, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, M. Giunta, J. Goldberg, E. Gross, J. Grunhaus, M. Gruwé, P. O. Günther, A. Gupta, C. Hajdu, M. Hamann, G. G. Hanson, A. Harel, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, J. C. Hill, K. Hoffman, D. Horváth, P. Igo-Kemenes, K. Ishii, H. Jeremie, P. Jovanovic, T. R. Junk, N. Kanaya, J. Kanzaki, D. Karlen, K. Kawagoe, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, S. Kluth, T. Kobayashi, M. Kobel, Sachio Komamiya, T. Krämer, P. Krieger, J. von Krogh, K. Kruger, T. Kuhl, M. Kupper, G. D. Lafferty, H. Landsman, D. Lanske, J. G. Layter, D. Lellouch, J. Letts, L. Levinson, J. Lillich, S. L. Lloyd, F. K. Loebinger, J. Lu, A. Ludwig, J. Ludwig, W. Mader, S. Marcellini, A. J. Martin, G. Masetti, T. Mashimo, P. Mättig, J. McKenna, R. A. McPherson, F. Meijers, W. Menges, F. S. Merritt, H. Mes, N. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, S. Moed, W. Mohr, T. Mori, A. Mutter, K. Nagai, I. Nakamura, H. Nanjo, H. A. Neal, R. Nisius, S. W. O'Neale, A. Oh, M. J. Oreglia, S. Orito, C. Pahl, G. Pásztor, J. R. Pater, J. E. Pilcher, J. Pinfold, D. E. Plane, B. Poli, O. Pooth, M. Przybycień, A. Quadt, K. Rabbertz, C. Rembser, P. Renkel, J. M. Roney, Y. Rozen, K. Runge, K. Sachs, T. Saeki, E. K.G. Sarkisyan, A. D. Schaile, O. Schaile, P. Scharff-Hansen, J. Schieck, T. Schörner-Sadenius, M. Schröder, M. Schumacher, W. G. Scott, R. Seuster, T. G. Shears, B. C. Shen, P. Sherwood, A. Skuja, A. M. Smith, R. Sobie, S. Söldner-Rembold, F. Spano, A. Stahl, D. Strom, R. Ströhmer, S. Tarem, M. Tasevsky, R. Teuscher, M. A. Thomson, E. Torrence, D. Toya, P. Tran, I. Trigger, Z. Trócsányi, E. Tsur, M. F. Turner-Watson, I. Ueda, B. Ujvári, C. F. Vollmer, P. Vannerem, R. Vértesi, M. Verzocchi, H. Voss, J. Vossebeld, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, T. Wengler, N. Wermes, G. W. Wilson, J. A. Wilson, G. Wolf, T. R. Wyatt, S. Yamashita, D. Zer-Zion, L. Zivkovic

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192-209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e+e- → νν̄γγ (γ). No evidence for new physics contributions to this final state is observed. Upper limits on σ(e+e- → XX)·BR2(X → Yγ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos (X = ν*, Y = ν), to neutralino production (X = χ̃ 2 0, Y = χ̃1 0) and to supersymmetric models in which X=χ̃10 and Y=G̃ is a light gravitino.

Original languageEnglish
Pages (from-to)167-179
Number of pages13
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume602
Issue number3-4
DOIs
Publication statusPublished - 2004 Nov 25
Externally publishedYes

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collisions
photons
gravitinos
pair production
acceptability
center of mass
energy
kinematics
neutrinos
physics
detectors
cross sections

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV. / Abbiendi, G.; Ainsley, C.; Akesson, P. F.; Alexander, G.; Allison, J.; Amaral, P.; Anagnostou, G.; Anderson, K. J.; Arcelli, S.; Asai, S.; Axen, D.; Azuelos, G.; Bailey, I.; Barberio, E.; Barillari, T.; Barlow, R. J.; Batley, R. J.; Bechtle, P.; Behnke, T.; Bell, K. W.; Bell, P. J.; Bella, G.; Bellerive, A.; Benelli, G.; Bethke, S.; Biebel, O.; Boeriu, O.; Bock, P.; Boutemeur, M.; Braibant, S.; Brigliadori, L.; Brown, R. M.; Buesser, K.; Burckhart, H. J.; Campana, S.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, D. G.; Ciocca, C.; Csilling, A.; Cuffiani, M.; Dado, S.; de Roeck, A.; de Wolf, E. A.; Desch, K.; Dienes, B.; Donkers, M.; Dubbert, J.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Etzion, E.; Fabbri, F.; Feld, L.; Ferrari, P.; Fiedler, F.; Fleck, I.; Ford, M.; Frey, A.; Gagnon, P.; Gary, J. W.; Gaycken, G.; Geich-Gimbel, C.; Giacomelli, G.; Giacomelli, P.; Giunta, M.; Goldberg, J.; Gross, E.; Grunhaus, J.; Gruwé, M.; Günther, P. O.; Gupta, A.; Hajdu, C.; Hamann, M.; Hanson, G. G.; Harel, A.; Hauschild, M.; Hawkes, C. M.; Hawkings, R.; Hemingway, R. J.; Herten, G.; Heuer, R. D.; Hill, J. C.; Hoffman, K.; Horváth, D.; Igo-Kemenes, P.; Ishii, K.; Jeremie, H.; Jovanovic, P.; Junk, T. R.; Kanaya, N.; Kanzaki, J.; Karlen, D.; Kawagoe, K.; Kawamoto, T.; Keeler, R. K.; Kellogg, R. G.; Kennedy, B. W.; Kluth, S.; Kobayashi, T.; Kobel, M.; Komamiya, Sachio; Krämer, T.; Krieger, P.; von Krogh, J.; Kruger, K.; Kuhl, T.; Kupper, M.; Lafferty, G. D.; Landsman, H.; Lanske, D.; Layter, J. G.; Lellouch, D.; Letts, J.; Levinson, L.; Lillich, J.; Lloyd, S. L.; Loebinger, F. K.; Lu, J.; Ludwig, A.; Ludwig, J.; Mader, W.; Marcellini, S.; Martin, A. J.; Masetti, G.; Mashimo, T.; Mättig, P.; McKenna, J.; McPherson, R. A.; Meijers, F.; Menges, W.; Merritt, F. S.; Mes, H.; Meyer, N.; Michelini, A.; Mihara, S.; Mikenberg, G.; Miller, D. J.; Moed, S.; Mohr, W.; Mori, T.; Mutter, A.; Nagai, K.; Nakamura, I.; Nanjo, H.; Neal, H. A.; Nisius, R.; O'Neale, S. W.; Oh, A.; Oreglia, M. J.; Orito, S.; Pahl, C.; Pásztor, G.; Pater, J. R.; Pilcher, J. E.; Pinfold, J.; Plane, D. E.; Poli, B.; Pooth, O.; Przybycień, M.; Quadt, A.; Rabbertz, K.; Rembser, C.; Renkel, P.; Roney, J. M.; Rozen, Y.; Runge, K.; Sachs, K.; Saeki, T.; Sarkisyan, E. K.G.; Schaile, A. D.; Schaile, O.; Scharff-Hansen, P.; Schieck, J.; Schörner-Sadenius, T.; Schröder, M.; Schumacher, M.; Scott, W. G.; Seuster, R.; Shears, T. G.; Shen, B. C.; Sherwood, P.; Skuja, A.; Smith, A. M.; Sobie, R.; Söldner-Rembold, S.; Spano, F.; Stahl, A.; Strom, D.; Ströhmer, R.; Tarem, S.; Tasevsky, M.; Teuscher, R.; Thomson, M. A.; Torrence, E.; Toya, D.; Tran, P.; Trigger, I.; Trócsányi, Z.; Tsur, E.; Turner-Watson, M. F.; Ueda, I.; Ujvári, B.; Vollmer, C. F.; Vannerem, P.; Vértesi, R.; Verzocchi, M.; Voss, H.; Vossebeld, J.; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Wells, P. S.; Wengler, T.; Wermes, N.; Wilson, G. W.; Wilson, J. A.; Wolf, G.; Wyatt, T. R.; Yamashita, S.; Zer-Zion, D.; Zivkovic, L.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 602, No. 3-4, 25.11.2004, p. 167-179.

Research output: Contribution to journalArticle

Abbiendi, G, Ainsley, C, Akesson, PF, Alexander, G, Allison, J, Amaral, P, Anagnostou, G, Anderson, KJ, Arcelli, S, Asai, S, Axen, D, Azuelos, G, Bailey, I, Barberio, E, Barillari, T, Barlow, RJ, Batley, RJ, Bechtle, P, Behnke, T, Bell, KW, Bell, PJ, Bella, G, Bellerive, A, Benelli, G, Bethke, S, Biebel, O, Boeriu, O, Bock, P, Boutemeur, M, Braibant, S, Brigliadori, L, Brown, RM, Buesser, K, Burckhart, HJ, Campana, S, Carnegie, RK, Carter, AA, Carter, JR, Chang, CY, Charlton, DG, Ciocca, C, Csilling, A, Cuffiani, M, Dado, S, de Roeck, A, de Wolf, EA, Desch, K, Dienes, B, 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, Gagnon, P, Gary, JW, Gaycken, G, Geich-Gimbel, C, Giacomelli, G, Giacomelli, P, Giunta, M, Goldberg, J, Gross, E, Grunhaus, J, Gruwé, M, Günther, PO, Gupta, A, Hajdu, C, Hamann, M, Hanson, GG, Harel, A, Hauschild, M, Hawkes, CM, Hawkings, R, Hemingway, RJ, Herten, G, Heuer, RD, Hill, JC, Hoffman, K, Horváth, D, Igo-Kemenes, P, Ishii, K, Jeremie, H, Jovanovic, P, Junk, TR, Kanaya, N, Kanzaki, J, Karlen, D, Kawagoe, K, Kawamoto, T, Keeler, RK, Kellogg, RG, Kennedy, BW, Kluth, S, Kobayashi, T, Kobel, M, Komamiya, S, Krämer, T, Krieger, P, von Krogh, J, Kruger, K, Kuhl, T, Kupper, M, Lafferty, GD, Landsman, H, Lanske, D, Layter, JG, Lellouch, D, Letts, J, Levinson, L, Lillich, J, Lloyd, SL, Loebinger, FK, Lu, J, Ludwig, A, Ludwig, J, Mader, W, Marcellini, S, Martin, AJ, Masetti, G, Mashimo, T, Mättig, P, McKenna, J, McPherson, RA, Meijers, F, Menges, W, Merritt, FS, Mes, H, Meyer, N, Michelini, A, Mihara, S, Mikenberg, G, Miller, DJ, Moed, S, Mohr, W, Mori, T, Mutter, A, Nagai, K, Nakamura, I, Nanjo, H, Neal, HA, Nisius, R, O'Neale, SW, Oh, A, Oreglia, MJ, Orito, S, Pahl, C, Pásztor, G, Pater, JR, Pilcher, JE, Pinfold, J, Plane, DE, Poli, B, Pooth, O, Przybycień, M, Quadt, A, Rabbertz, K, Rembser, C, Renkel, P, Roney, JM, Rozen, Y, Runge, K, Sachs, K, Saeki, T, Sarkisyan, EKG, Schaile, AD, Schaile, O, Scharff-Hansen, P, Schieck, J, Schörner-Sadenius, T, Schröder, M, Schumacher, M, Scott, WG, Seuster, R, Shears, TG, Shen, BC, Sherwood, P, Skuja, A, Smith, AM, Sobie, R, Söldner-Rembold, S, Spano, F, Stahl, A, Strom, D, Ströhmer, R, Tarem, S, Tasevsky, M, Teuscher, R, Thomson, MA, Torrence, E, Toya, D, Tran, P, Trigger, I, Trócsányi, Z, Tsur, E, Turner-Watson, MF, Ueda, I, Ujvári, B, Vollmer, CF, Vannerem, P, Vértesi, R, Verzocchi, M, Voss, H, Vossebeld, J, Ward, CP, Ward, DR, Watkins, PM, Watson, AT, Watson, NK, Wells, PS, Wengler, T, Wermes, N, Wilson, GW, Wilson, JA, Wolf, G, Wyatt, TR, Yamashita, S, Zer-Zion, D & Zivkovic, L 2004, 'Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 602, no. 3-4, pp. 167-179. https://doi.org/10.1016/j.physletb.2004.09.059
Abbiendi, G. ; Ainsley, C. ; Akesson, P. F. ; Alexander, G. ; Allison, J. ; Amaral, P. ; Anagnostou, G. ; Anderson, K. J. ; Arcelli, S. ; Asai, S. ; Axen, D. ; Azuelos, G. ; Bailey, I. ; Barberio, E. ; Barillari, T. ; Barlow, R. J. ; Batley, R. J. ; Bechtle, P. ; Behnke, T. ; Bell, K. W. ; Bell, P. J. ; Bella, G. ; Bellerive, A. ; Benelli, G. ; Bethke, S. ; Biebel, O. ; Boeriu, O. ; Bock, P. ; Boutemeur, M. ; Braibant, S. ; Brigliadori, L. ; Brown, R. M. ; Buesser, K. ; Burckhart, H. J. ; Campana, S. ; Carnegie, R. K. ; Carter, A. A. ; Carter, J. R. ; Chang, C. Y. ; Charlton, D. G. ; Ciocca, C. ; Csilling, A. ; Cuffiani, M. ; Dado, S. ; de Roeck, A. ; de Wolf, E. A. ; Desch, K. ; Dienes, B. ; Donkers, M. ; Dubbert, J. ; Duchovni, E. ; Duckeck, G. ; Duerdoth, I. P. ; Etzion, E. ; Fabbri, F. ; Feld, L. ; Ferrari, P. ; Fiedler, F. ; Fleck, I. ; Ford, M. ; Frey, A. ; Gagnon, P. ; Gary, J. W. ; Gaycken, G. ; Geich-Gimbel, C. ; Giacomelli, G. ; Giacomelli, P. ; Giunta, M. ; Goldberg, J. ; Gross, E. ; Grunhaus, J. ; Gruwé, M. ; Günther, P. O. ; Gupta, A. ; Hajdu, C. ; Hamann, M. ; Hanson, G. G. ; Harel, A. ; Hauschild, M. ; Hawkes, C. M. ; Hawkings, R. ; Hemingway, R. J. ; Herten, G. ; Heuer, R. D. ; Hill, J. C. ; Hoffman, K. ; Horváth, D. ; Igo-Kemenes, P. ; Ishii, K. ; Jeremie, H. ; Jovanovic, P. ; Junk, T. R. ; Kanaya, N. ; Kanzaki, J. ; Karlen, D. ; Kawagoe, K. ; Kawamoto, T. ; Keeler, R. K. ; Kellogg, R. G. ; Kennedy, B. W. ; Kluth, S. ; Kobayashi, T. ; Kobel, M. ; Komamiya, Sachio ; Krämer, T. ; Krieger, P. ; von Krogh, J. ; Kruger, K. ; Kuhl, T. ; Kupper, M. ; Lafferty, G. D. ; Landsman, H. ; Lanske, D. ; Layter, J. G. ; Lellouch, D. ; Letts, J. ; Levinson, L. ; Lillich, J. ; Lloyd, S. L. ; Loebinger, F. K. ; Lu, J. ; Ludwig, A. ; Ludwig, J. ; Mader, W. ; Marcellini, S. ; Martin, A. J. ; Masetti, G. ; Mashimo, T. ; Mättig, P. ; McKenna, J. ; McPherson, R. A. ; Meijers, F. ; Menges, W. ; Merritt, F. S. ; Mes, H. ; Meyer, N. ; Michelini, A. ; Mihara, S. ; Mikenberg, G. ; Miller, D. J. ; Moed, S. ; Mohr, W. ; Mori, T. ; Mutter, A. ; Nagai, K. ; Nakamura, I. ; Nanjo, H. ; Neal, H. A. ; Nisius, R. ; O'Neale, S. W. ; Oh, A. ; Oreglia, M. J. ; Orito, S. ; Pahl, C. ; Pásztor, G. ; Pater, J. R. ; Pilcher, J. E. ; Pinfold, J. ; Plane, D. E. ; Poli, B. ; Pooth, O. ; Przybycień, M. ; Quadt, A. ; Rabbertz, K. ; Rembser, C. ; Renkel, P. ; Roney, J. M. ; Rozen, Y. ; Runge, K. ; Sachs, K. ; Saeki, T. ; Sarkisyan, E. K.G. ; Schaile, A. D. ; Schaile, O. ; Scharff-Hansen, P. ; Schieck, J. ; Schörner-Sadenius, T. ; Schröder, M. ; Schumacher, M. ; Scott, W. G. ; Seuster, R. ; Shears, T. G. ; Shen, B. C. ; Sherwood, P. ; Skuja, A. ; Smith, A. M. ; Sobie, R. ; Söldner-Rembold, S. ; Spano, F. ; Stahl, A. ; Strom, D. ; Ströhmer, R. ; Tarem, S. ; Tasevsky, M. ; Teuscher, R. ; Thomson, M. A. ; Torrence, E. ; Toya, D. ; Tran, P. ; Trigger, I. ; Trócsányi, Z. ; Tsur, E. ; Turner-Watson, M. F. ; Ueda, I. ; Ujvári, B. ; Vollmer, C. F. ; Vannerem, P. ; Vértesi, R. ; Verzocchi, M. ; Voss, H. ; Vossebeld, J. ; Ward, C. P. ; Ward, D. R. ; Watkins, P. M. ; Watson, A. T. ; Watson, N. K. ; Wells, P. S. ; Wengler, T. ; Wermes, N. ; Wilson, G. W. ; Wilson, J. A. ; Wolf, G. ; Wyatt, T. R. ; Yamashita, S. ; Zer-Zion, D. ; Zivkovic, L. / Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2004 ; Vol. 602, No. 3-4. pp. 167-179.
@article{fd81102964694bb8bfcd59e77edb2d70,
title = "Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV",
abstract = "Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192-209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e+e- → νν̄γγ (γ). No evidence for new physics contributions to this final state is observed. Upper limits on σ(e+e- → XX)·BR2(X → Yγ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos (X = ν*, Y = ν), to neutralino production (X = χ̃ 2 0, Y = χ̃1 0) and to supersymmetric models in which X=χ̃10 and Y=G̃ is a light gravitino.",
author = "G. Abbiendi and C. Ainsley and Akesson, {P. F.} and G. Alexander and J. Allison and P. Amaral and G. Anagnostou and Anderson, {K. J.} and S. Arcelli and S. Asai and D. Axen and G. Azuelos and I. Bailey and E. Barberio and T. Barillari and Barlow, {R. J.} and Batley, {R. J.} and P. Bechtle and T. Behnke and Bell, {K. W.} and Bell, {P. J.} and G. Bella and A. Bellerive and G. Benelli and S. Bethke and O. Biebel and O. Boeriu and P. Bock and M. Boutemeur and S. Braibant and L. Brigliadori and Brown, {R. M.} and K. Buesser and Burckhart, {H. J.} and S. Campana and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and C. Ciocca and A. Csilling and M. Cuffiani and S. Dado and {de Roeck}, A. and {de Wolf}, {E. A.} and K. Desch and B. Dienes 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 P. Gagnon and Gary, {J. W.} and G. Gaycken and C. Geich-Gimbel and G. Giacomelli and P. Giacomelli and M. Giunta and J. Goldberg and E. Gross and J. Grunhaus and M. Gruw{\'e} and G{\"u}nther, {P. O.} and A. Gupta and C. Hajdu and M. Hamann and Hanson, {G. G.} and A. Harel and M. Hauschild and Hawkes, {C. M.} and R. Hawkings and Hemingway, {R. J.} and G. Herten and Heuer, {R. D.} and Hill, {J. C.} and K. Hoffman and D. Horv{\'a}th and P. Igo-Kemenes and K. Ishii and H. Jeremie and P. Jovanovic and Junk, {T. R.} and N. Kanaya and J. Kanzaki and D. Karlen and K. Kawagoe and T. Kawamoto and Keeler, {R. K.} and Kellogg, {R. G.} and Kennedy, {B. W.} and S. Kluth and T. Kobayashi and M. Kobel and Sachio Komamiya and T. Kr{\"a}mer and P. Krieger and {von Krogh}, J. and K. Kruger and T. Kuhl and M. Kupper and Lafferty, {G. D.} and H. Landsman and D. Lanske and Layter, {J. G.} and D. Lellouch and J. Letts and L. Levinson and J. Lillich and Lloyd, {S. L.} and Loebinger, {F. K.} and J. Lu and A. Ludwig and J. Ludwig and W. Mader and S. Marcellini and Martin, {A. J.} and G. Masetti and T. Mashimo and P. M{\"a}ttig and J. McKenna and McPherson, {R. A.} and F. Meijers and W. Menges and Merritt, {F. S.} and H. Mes and N. Meyer and A. Michelini and S. Mihara and G. Mikenberg and Miller, {D. J.} and S. Moed and W. Mohr and T. Mori and A. Mutter and K. Nagai and I. Nakamura and H. Nanjo and Neal, {H. A.} and R. Nisius and O'Neale, {S. W.} and A. Oh and Oreglia, {M. J.} and S. Orito and C. Pahl and G. P{\'a}sztor and Pater, {J. R.} and Pilcher, {J. E.} and J. Pinfold and Plane, {D. E.} and B. Poli and O. Pooth and M. Przybycień and A. Quadt and K. Rabbertz and C. Rembser and P. Renkel and Roney, {J. M.} and Y. Rozen and K. Runge and K. Sachs and T. Saeki and Sarkisyan, {E. K.G.} and Schaile, {A. D.} and O. Schaile and P. Scharff-Hansen and J. Schieck and T. Sch{\"o}rner-Sadenius and M. Schr{\"o}der and M. Schumacher and Scott, {W. G.} and R. Seuster and Shears, {T. G.} and Shen, {B. C.} and P. Sherwood and A. Skuja and Smith, {A. M.} and R. Sobie and S. S{\"o}ldner-Rembold and F. Spano and A. Stahl and D. Strom and R. Str{\"o}hmer and S. Tarem and M. Tasevsky and R. Teuscher and Thomson, {M. A.} and E. Torrence and D. Toya and P. Tran and I. Trigger and Z. Tr{\'o}cs{\'a}nyi and E. Tsur and Turner-Watson, {M. F.} and I. Ueda and B. Ujv{\'a}ri and Vollmer, {C. F.} and P. Vannerem and R. V{\'e}rtesi and M. Verzocchi and H. Voss and J. Vossebeld 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 Wilson, {G. W.} and Wilson, {J. A.} and G. Wolf and Wyatt, {T. R.} and S. Yamashita and D. Zer-Zion and L. Zivkovic",
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month = "11",
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doi = "10.1016/j.physletb.2004.09.059",
language = "English",
volume = "602",
pages = "167--179",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
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TY - JOUR

T1 - Multi-photon events with large missing energy in e+e- collisions at √s = 192-209 GeV

AU - Abbiendi, G.

AU - Ainsley, C.

AU - Akesson, P. F.

AU - Alexander, G.

AU - Allison, J.

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PY - 2004/11/25

Y1 - 2004/11/25

N2 - Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192-209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e+e- → νν̄γγ (γ). No evidence for new physics contributions to this final state is observed. Upper limits on σ(e+e- → XX)·BR2(X → Yγ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos (X = ν*, Y = ν), to neutralino production (X = χ̃ 2 0, Y = χ̃1 0) and to supersymmetric models in which X=χ̃10 and Y=G̃ is a light gravitino.

AB - Events with a final state consisting of two or more photons and large missing transverse energy have been observed in e+e- collisions at centre-of-mass energies in the range 192-209 GeV using the OPAL detector at LEP. Cross-section measurements are performed within the kinematic acceptance of the selection and compared with the expectations from the Standard Model process e+e- → νν̄γγ (γ). No evidence for new physics contributions to this final state is observed. Upper limits on σ(e+e- → XX)·BR2(X → Yγ) are derived for the case of stable and invisible Y. In the case of massive Y the combined limits obtained from all the data range from 10 to 60 fb, while for the special case of massless Y the range is 20 to 40 fb. The limits apply to pair production of excited neutrinos (X = ν*, Y = ν), to neutralino production (X = χ̃ 2 0, Y = χ̃1 0) and to supersymmetric models in which X=χ̃10 and Y=G̃ is a light gravitino.

UR - http://www.scopus.com/inward/record.url?scp=7444240981&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=7444240981&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2004.09.059

DO - 10.1016/j.physletb.2004.09.059

M3 - Article

VL - 602

SP - 167

EP - 179

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 3-4

ER -