Search for decays of the Z0 into a photon and a pseudoscalar meson

D. Decamp; B. Deschizeaux; C. Goy; J. P. Lees; M. N. Minard; J. M. Crespo; M. Delfino; E. Fernandez; M. Martinez; R. Miquel; Ll M. Mir; S. Orteu; A. Pacheco; J. A. Perlas; E. Tubau; M. G. Catanesi; M. De Palma; A. Farilla; G. Iaselli; G. Maggi; S. Natali; S. Nuzzo; A. Ranieri; G. Raso; F. Romano; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; G. Zito; Y. Gao; H. Hu; D. Huang; S. Jin; J. Lin; T. Ruan; T. Wang; W. Wu; Y. Xie; D. Xu; R. Xu; J. Zhang; Z. Zhang; W. Zhao; H. Albrecht; W. B. Atwood; F. Bird; E. Blucher; T. H. Burnett; T. Charity; H. Drevermann; Ll Garrido; C. Grab; R. Hagelberg; S. Haywood; B. Jost; M. Kaseman; G. Kellner; J. Knobloch; A. Lacourt; I. Lehraus; T. Lohse; D. Lüke; A. Marchioro; P. Mato; J. May; A. Minten; A. Miotto; P. Palazzi; M. Pepe-Altarelli; F. Ranjard; A. Roth; J. Rothberg; H. Rotscheidt; W. Von Rüden; R. St.Denis; D. Schlatter; M. Takashima; M. Talby; H. Taureg; W. Tejessy; H. Wachsmuth; S. Wheeler; W. Wiedenmann; W. Witzeling; J. Wotschack; Z. Ajaltouni; M. Bardadin-Otwinowska; A. Falvard; P. Gay; P. Henrard; J. Jousset; B. Michel; J. C. Montret; D. Pallin; P. Perret; J. Proriol; F. Prulhière; J. D. Hansen; J. R. Hansen; P. H. Hansen; R. Møllerud; G. Petersen; E. Simopoulou; A. Vayaki; J. Badier; A. Blondel; G. Bonneaud; J. Bourotte; F. Braems; J. C. Brient; M. A. Ciocci; G. Fouque; R. Guirlet; A. Rougé; M. Rumpf; R. Tanaka; H. Videau; I. Videau; D. J. Candlin; A. Conti; G. Parrini; M. Corden; C. Georgiopoulos; J. H. Goldman; M. Ikeda; J. Lannutti; D. Levinthal; M. Mermikides; L. Sawyer; G. Stimpfl; A. Antonelli; R. Baldini; G. Bencivenni; G. Bologna; F. Bossi; P. Campana; G. Capon; V. Chiarella; G. De Ninno; B. D'Ettorre-Piazzoli; G. Felici; P. Laurelli; G. Mannocchi; F. Murtas; G. P. Murtas; G. Nicoletti; P. Picchi; P. Zografou; B. Altoon; O. Boyle; A. W. Halley; I. Ten Have; J. L. Hearns; J. G. Lynch; W. T. Morton; C. Raine; J. M. Scarr; K. Smith; A. S. Thompson; B. Brandl; O. Braun; R. Geiges; C. Geweniger; P. Hanke; V. Hepp; E. E. Kluge; Y. Maumary; M. Panter; A. Putzer; B. Rensch; A. Stahl; K. Tittel; M. Wunsch; A. T. Belk; R. Beuselinck; D. M. Binnie; W. Cameron; M. Cattaneo; P. J. Dornan; S. Dugeay; R. W. Forty; A. M. Greene; J. F. Hassard; S. J. Patton; J. K. Sedgbeer; G. Taylor; I. R. Tomalin; A. G. Wright; P. Girtler; D. Kuhn; G. Rudolph; C. K. Bowdery; T. J. Brodbeck; A. J. Finch; F. Foster; G. Hughes; N. R. Keemer; M. Nuttall; B. S. Rowlingson; T. Sloan; S. W. Snow; T. Barczewski; L. A.T. Bauerdick; K. Kleinknecht; B. Renk; S. Roehn; H. G. Sander; M. Schmelling; F. Steeg; J. P. Albanese; J. J. Aubert; C. Benchouk; A. Bonissent; D. Courvoisier; F. Etienne; E. Matsinos; S. Papalexiou; P. Payre; B. Pietrzyk; Z. Qian; W. Blum; P. Cattaneo; G. Cowan; B. Dehning; H. Dietl; M. Fernandez-Bosman; D. Hauff; A. Jahn; E. Lange; G. Lütjens; G. Lutz; W. Männer; H. G. Moser; Y. Pan; R. Richter; A. S. Schwarz; R. Settles; U. Stiegler; U. Stierlin; J. Thomas; G. Waltermann; V. Bertin; G. De Bouard; J. Boucrot; O. Callot; X. Chen; A. Cordier; M. Davier; G. Ganis; J. F. Grivaz; Ph Heusse; P. Janot; V. Journé; D. W. Kim; J. Lefrançois; A. M. Lutz; J. J. Veillet; F. Zomer; S. R. Amendolia; G. Bagliesi; G. Batignani; L. Bosisio; U. Bottigli; C. Bradaschia; I. Ferrante; F. Fidecaro; L. Foà; E. Focardi; F. Forti; A. Giassi; M. A. Giorgi; F. Ligabue; A. Lusiani; E. B. Mannelli; P. S. Marrocchesi; A. Messineo; F. Palla; G. Sanguinetti; S. Scapellato; J. Steinberger; R. Tenchini; G. Tonelli; G. Triggiani; J. M. Carter; M. G. Green; P. V. March; T. Medcalf; M. R. Saich; J. A. Strong; R. M. Thomas; T. Wildish; D. R. Botterill; R. W. Clifft; T. R. Edgecock; M. Edwards; S. M. Fisher; J. Harvey; T. J. Jones; P. R. Norton; D. P. Salmon; J. C. Thompson; B. Bloch-Devaux; P. Colas; C. Klopfenstein; E. Lançon; E. Locci; S. Loucatos; L. Mirabito; E. Monnier; P. Perez; F. Perrier; J. Rander; J. F. Renardy; A. Roussarie; J. P. Schuller; J. G. Ashman; C. N. Booth; F. Combley; M. Dinsdale; J. Martin; D. Parker; L. F. Thompson; S. Brandt; H. Burkhardt; C. Grupen; H. Meinhard; E. Neugebauer; U. Schäfer; H. Seywerd; B. Gobbo; F. Liello; E. Milotti; F. Ragusa; L. Rolandi; L. Bellantoni; J. F. Boudreau; D. Cinabro; J. S. Conway; D. F. Cowen; Z. Feng; J. L. Harton; J. Hilgart; R. C. Jared; R. P. Johnson; B. W. Leclaire; Y. B. Pan; T. Parker; J. R. Pater; Y. Saadi; V. Sharma; J. A. Wear; F. V. Weber; Sau Lan Wu; S. T. Xue; G. Zobernig

doi:10.1016/0370-2693(90)91883-D

Search for decays of the Z⁰ into a photon and a pseudoscalar meson

D. Decamp, B. Deschizeaux, C. Goy, J. P. Lees, M. N. Minard, J. M. Crespo, M. Delfino, E. Fernandez, M. Martinez, R. Miquel, Ll M. Mir, S. Orteu, A. Pacheco, J. A. Perlas, E. Tubau, M. G. Catanesi, M. De Palma, A. Farilla, G. Iaselli, G. MaggiS. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Gao, H. Hu, D. Huang, S. Jin, J. Lin, T. Ruan, T. Wang, W. Wu, Y. Xie, D. Xu, R. Xu, J. Zhang, Z. Zhang, W. Zhao, H. Albrecht, W. B. Atwood, F. Bird, E. Blucher, T. H. Burnett, T. Charity, H. Drevermann, Ll Garrido, C. Grab, R. Hagelberg, S. Haywood, B. Jost, M. Kaseman, G. Kellner, J. Knobloch, A. Lacourt, I. Lehraus, T. Lohse, D. Lüke, A. Marchioro, P. Mato, J. May, A. Minten, A. Miotto, P. Palazzi, M. Pepe-Altarelli, F. Ranjard, A. Roth, J. Rothberg, H. Rotscheidt, W. Von Rüden, R. St.Denis, D. Schlatter, M. Takashima, M. Talby, H. Taureg, W. Tejessy, H. Wachsmuth, S. Wheeler, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, J. C. Montret, D. Pallin, P. Perret, J. Proriol, F. Prulhière, J. D. Hansen, J. R. Hansen, P. H. Hansen, R. Møllerud, G. Petersen, E. Simopoulou, A. Vayaki, J. Badier, A. Blondel, G. Bonneaud, J. Bourotte, F. Braems, J. C. Brient, M. A. Ciocci, G. Fouque, R. Guirlet, A. Rougé, M. Rumpf, R. Tanaka, H. Videau, I. Videau, D. J. Candlin, A. Conti, G. Parrini, M. Corden, C. Georgiopoulos, J. H. Goldman, M. Ikeda, J. Lannutti, D. Levinthal, M. Mermikides, L. Sawyer, G. Stimpfl, A. Antonelli, R. Baldini, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, G. De Ninno, B. D'Ettorre-Piazzoli, G. Felici, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, G. Nicoletti, P. Picchi, P. Zografou, B. Altoon, O. Boyle, A. W. Halley, I. Ten Have, J. L. Hearns, J. G. Lynch, W. T. Morton, C. Raine, J. M. Scarr, K. Smith, A. S. Thompson, B. Brandl, O. Braun, R. Geiges, C. Geweniger, P. Hanke, V. Hepp, E. E. Kluge, Y. Maumary, M. Panter, A. Putzer, B. Rensch, A. Stahl, K. Tittel, M. Wunsch, A. T. Belk, R. Beuselinck, D. M. Binnie, W. Cameron, M. Cattaneo, P. J. Dornan, S. Dugeay, R. W. Forty, A. M. Greene, J. F. Hassard, S. J. Patton, J. K. Sedgbeer, G. Taylor, I. R. Tomalin, A. G. Wright, P. Girtler, D. Kuhn, G. Rudolph, C. K. Bowdery, T. J. Brodbeck, A. J. Finch, F. Foster, G. Hughes, N. R. Keemer, M. Nuttall, B. S. Rowlingson, T. Sloan, S. W. Snow, T. Barczewski, L. A.T. Bauerdick, K. Kleinknecht, B. Renk, S. Roehn, H. G. Sander, M. Schmelling, F. Steeg, J. P. Albanese, J. J. Aubert, C. Benchouk, A. Bonissent, D. Courvoisier, F. Etienne, E. Matsinos, S. Papalexiou, P. Payre, B. Pietrzyk, Z. Qian, W. Blum, P. Cattaneo, G. Cowan, B. Dehning, H. Dietl, M. Fernandez-Bosman, D. Hauff, A. Jahn, E. Lange, G. Lütjens, G. Lutz, W. Männer, H. G. Moser, Y. Pan, R. Richter, A. S. Schwarz, R. Settles, U. Stiegler, U. Stierlin, J. Thomas, G. Waltermann, V. Bertin, G. De Bouard, J. Boucrot, O. Callot, X. Chen, A. Cordier, M. Davier, G. Ganis, J. F. Grivaz, Ph Heusse, P. Janot, V. Journé, D. W. Kim, J. Lefrançois, A. M. Lutz, J. J. Veillet, F. Zomer, S. R. Amendolia, G. Bagliesi, G. Batignani, L. Bosisio, U. Bottigli, C. Bradaschia, I. Ferrante, F. Fidecaro, L. Foà, E. Focardi, F. Forti, A. Giassi, M. A. Giorgi, F. Ligabue, A. Lusiani, E. B. Mannelli, P. S. Marrocchesi, A. Messineo, F. Palla, G. Sanguinetti, S. Scapellato, J. Steinberger, R. Tenchini, G. Tonelli, G. Triggiani, J. M. Carter, M. G. Green, P. V. March, T. Medcalf, M. R. Saich, J. A. Strong, R. M. Thomas, T. Wildish, D. R. Botterill, R. W. Clifft, T. R. Edgecock, M. Edwards, S. M. Fisher, J. Harvey, T. J. Jones, P. R. Norton, D. P. Salmon, J. C. Thompson, B. Bloch-Devaux, P. Colas, C. Klopfenstein, E. Lançon, E. Locci, S. Loucatos, L. Mirabito, E. Monnier, P. Perez, F. Perrier, J. Rander, J. F. Renardy, A. Roussarie, J. P. Schuller, J. G. Ashman, C. N. Booth, F. Combley, M. Dinsdale, J. Martin, D. Parker, L. F. Thompson, S. Brandt, H. Burkhardt, C. Grupen, H. Meinhard, E. Neugebauer, U. Schäfer, H. Seywerd, B. Gobbo, F. Liello, E. Milotti, F. Ragusa, L. Rolandi, L. Bellantoni, J. F. Boudreau, D. Cinabro, J. S. Conway, D. F. Cowen, Z. Feng, J. L. Harton, J. Hilgart, R. C. Jared, R. P. Johnson, B. W. Leclaire, Y. B. Pan, T. Parker, J. R. Pater, Y. Saadi, V. Sharma, J. A. Wear, F. V. Weber, Sau Lan Wu, S. T. Xue, G. Zobernig

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

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Abstract

A search is reported for decays of the Z⁰ into π⁰γ, ηγ and η′ (958)γ in e⁺e^- collisions using data collected during a scan around the Z⁰ mass. In order to search for π⁰γ final states, in which the two photons from the π⁰ decay are unresolved, the production of pairs of high-energy electromagnetic clusters is studied. The data are compared with the expectations from the pure QED process e⁺e^- → γγ, and a 95% confidence level upper limit on the branching ratio of the Z⁰ into π⁰γ of 4.9 × 10^-4 is derived. For η′γ, the decay modes of the mesons that contain two charged particles are largely free from QED background. These modes are used to place upper limits of 4.6 × 10^-4 and 2.2 × 10^-4 on the corresponding branching ratios of the Z⁰.

Original language	English (US)
Pages (from-to)	635-643
Number of pages	9
Journal	Physics Letters B
Volume	241
Issue number	4
DOIs	https://doi.org/10.1016/0370-2693(90)91883-D
State	Published - May 24 1990

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

Access to Document

10.1016/0370-2693(90)91883-D

Cite this

Decamp, D., Deschizeaux, B., Goy, C., Lees, J. P., Minard, M. N., Crespo, J. M., Delfino, M., Fernandez, E., Martinez, M., Miquel, R., Mir, L. M., Orteu, S., Pacheco, A., Perlas, J. A., Tubau, E., Catanesi, M. G., De Palma, M., Farilla, A., Iaselli, G., ... Zobernig, G. (1990). Search for decays of the Z⁰ into a photon and a pseudoscalar meson. Physics Letters B, 241(4), 635-643. https://doi.org/10.1016/0370-2693(90)91883-D

@article{f5208a712fec48dcbe4d5dc4c3d81e2f,

title = "Search for decays of the Z0 into a photon and a pseudoscalar meson",

abstract = "A search is reported for decays of the Z0 into π0γ, ηγ and η′ (958)γ in e+e- collisions using data collected during a scan around the Z0 mass. In order to search for π0γ final states, in which the two photons from the π0 decay are unresolved, the production of pairs of high-energy electromagnetic clusters is studied. The data are compared with the expectations from the pure QED process e+e- → γγ, and a 95% confidence level upper limit on the branching ratio of the Z0 into π0γ of 4.9 × 10-4 is derived. For η′γ, the decay modes of the mesons that contain two charged particles are largely free from QED background. These modes are used to place upper limits of 4.6 × 10-4 and 2.2 × 10-4 on the corresponding branching ratios of the Z0.",

author = "D. Decamp and B. Deschizeaux and C. Goy and Lees, {J. P.} and Minard, {M. N.} and Crespo, {J. M.} and M. Delfino and E. Fernandez and M. Martinez and R. Miquel and Mir, {Ll M.} and S. Orteu and A. Pacheco and Perlas, {J. A.} and E. Tubau and Catanesi, {M. G.} and {De Palma}, M. and A. Farilla and G. Iaselli and G. Maggi and S. Natali and S. Nuzzo and A. Ranieri and G. Raso and F. Romano and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta and G. Zito and Y. Gao and H. Hu and D. Huang and S. Jin and J. Lin and T. Ruan and T. Wang and W. Wu and Y. Xie and D. Xu and R. Xu and J. Zhang and Z. Zhang and W. Zhao and H. Albrecht and Atwood, {W. B.} and F. Bird and E. Blucher and Burnett, {T. H.} and T. Charity and H. Drevermann and Ll Garrido and C. Grab and R. Hagelberg and S. Haywood and B. Jost and M. Kaseman and G. Kellner and J. Knobloch and A. Lacourt and I. Lehraus and T. Lohse and D. L{\"u}ke and A. Marchioro and P. Mato and J. May and A. Minten and A. Miotto and P. Palazzi and M. Pepe-Altarelli and F. Ranjard and A. Roth and J. Rothberg and H. Rotscheidt and {Von R{\"u}den}, W. and R. St.Denis and D. Schlatter and M. Takashima and M. Talby and H. Taureg and W. Tejessy and H. Wachsmuth and S. Wheeler and W. Wiedenmann and W. Witzeling and J. Wotschack and Z. Ajaltouni and M. Bardadin-Otwinowska and A. Falvard and P. Gay and P. Henrard and J. Jousset and B. Michel and Montret, {J. C.} and D. Pallin and P. Perret and J. Proriol and F. Prulhi{\`e}re and Hansen, {J. D.} and Hansen, {J. R.} and Hansen, {P. H.} and R. M{\o}llerud and G. Petersen and E. Simopoulou and A. Vayaki and J. Badier and A. Blondel and G. Bonneaud and J. Bourotte and F. Braems and Brient, {J. C.} and Ciocci, {M. A.} and G. Fouque and R. Guirlet and A. Roug{\'e} and M. Rumpf and R. Tanaka and H. Videau and I. Videau and Candlin, {D. J.} and A. Conti and G. Parrini and M. Corden and C. Georgiopoulos and Goldman, {J. H.} and M. Ikeda and J. Lannutti and D. Levinthal and M. Mermikides and L. Sawyer and G. Stimpfl and A. Antonelli and R. Baldini and G. Bencivenni and G. Bologna and F. Bossi and P. Campana and G. Capon and V. Chiarella and {De Ninno}, G. and B. D'Ettorre-Piazzoli and G. Felici and P. Laurelli and G. Mannocchi and F. Murtas and Murtas, {G. P.} and G. Nicoletti and P. Picchi and P. Zografou and B. Altoon and O. Boyle and Halley, {A. W.} and {Ten Have}, I. and Hearns, {J. L.} and Lynch, {J. G.} and Morton, {W. T.} and C. Raine and Scarr, {J. M.} and K. Smith and Thompson, {A. S.} and B. Brandl and O. Braun and R. Geiges and C. Geweniger and P. Hanke and V. Hepp and Kluge, {E. E.} and Y. Maumary and M. Panter and A. Putzer and B. Rensch and A. Stahl and K. Tittel and M. Wunsch and Belk, {A. T.} and R. Beuselinck and Binnie, {D. M.} and W. Cameron and M. Cattaneo and Dornan, {P. J.} and S. Dugeay and Forty, {R. W.} and Greene, {A. M.} and Hassard, {J. F.} and Patton, {S. J.} and Sedgbeer, {J. K.} and G. Taylor and Tomalin, {I. R.} and Wright, {A. G.} and P. Girtler and D. Kuhn and G. Rudolph and Bowdery, {C. K.} and Brodbeck, {T. J.} and Finch, {A. J.} and F. Foster and G. Hughes and Keemer, {N. R.} and M. Nuttall and Rowlingson, {B. S.} and T. Sloan and Snow, {S. W.} and T. Barczewski and Bauerdick, {L. A.T.} and K. Kleinknecht and B. Renk and S. Roehn and Sander, {H. G.} and M. Schmelling and F. Steeg and Albanese, {J. P.} and Aubert, {J. J.} and C. Benchouk and A. Bonissent and D. Courvoisier and F. Etienne and E. Matsinos and S. Papalexiou and P. Payre and B. Pietrzyk and Z. Qian and W. Blum and P. Cattaneo and G. Cowan and B. Dehning and H. Dietl and M. Fernandez-Bosman and D. Hauff and A. Jahn and E. Lange and G. L{\"u}tjens and G. Lutz and W. M{\"a}nner and Moser, {H. G.} and Y. Pan and R. Richter and Schwarz, {A. S.} and R. Settles and U. Stiegler and U. Stierlin and J. Thomas and G. Waltermann and V. Bertin and {De Bouard}, G. and J. Boucrot and O. Callot and X. Chen and A. Cordier and M. Davier and G. Ganis and Grivaz, {J. F.} and Ph Heusse and P. Janot and V. Journ{\'e} and Kim, {D. W.} and J. Lefran{\c c}ois and Lutz, {A. M.} and Veillet, {J. J.} and F. Zomer and Amendolia, {S. R.} and G. Bagliesi and G. Batignani and L. Bosisio and U. Bottigli and C. Bradaschia and I. Ferrante and F. Fidecaro and L. Fo{\`a} and E. Focardi and F. Forti and A. Giassi and Giorgi, {M. A.} and F. Ligabue and A. Lusiani and Mannelli, {E. B.} and Marrocchesi, {P. S.} and A. Messineo and F. Palla and G. Sanguinetti and S. Scapellato and J. Steinberger and R. Tenchini and G. Tonelli and G. Triggiani and Carter, {J. M.} and Green, {M. G.} and March, {P. V.} and T. Medcalf and Saich, {M. R.} and Strong, {J. A.} and Thomas, {R. M.} and T. Wildish and Botterill, {D. R.} and Clifft, {R. W.} and Edgecock, {T. R.} and M. Edwards and Fisher, {S. M.} and J. Harvey and Jones, {T. J.} and Norton, {P. R.} and Salmon, {D. P.} and Thompson, {J. C.} and B. Bloch-Devaux and P. Colas and C. Klopfenstein and E. Lan{\c c}on and E. Locci and S. Loucatos and L. Mirabito and E. Monnier and P. Perez and F. Perrier and J. Rander and Renardy, {J. F.} and A. Roussarie and Schuller, {J. P.} and Ashman, {J. G.} and Booth, {C. N.} and F. Combley and M. Dinsdale and J. Martin and D. Parker and Thompson, {L. F.} and S. Brandt and H. Burkhardt and C. Grupen and H. Meinhard and E. Neugebauer and U. Sch{\"a}fer and H. Seywerd and B. Gobbo and F. Liello and E. Milotti and F. Ragusa and L. Rolandi and L. Bellantoni and Boudreau, {J. F.} and D. Cinabro and Conway, {J. S.} and Cowen, {D. F.} and Z. Feng and Harton, {J. L.} and J. Hilgart and Jared, {R. C.} and Johnson, {R. P.} and Leclaire, {B. W.} and Pan, {Y. B.} and T. Parker and Pater, {J. R.} and Y. Saadi and V. Sharma and Wear, {J. A.} and Weber, {F. V.} and Wu, {Sau Lan} and Xue, {S. T.} and G. Zobernig",

note = "Funding Information: The decay branching ratio of the Z ° into a photon and a light pseudoscalar meson is predicted by the standard model to be unobservably small \[ 1 \]. However it has been argued recently that such a decay could occur at a rate accessible to the LEP experiments \[2 -4 \]. Indeed, the branching ratio for the decay Z°-.n° 7 could be as large as 1.7X 10 -3 if the hypothesis of the partially conserved axial current (PCAC) still holds at LEP energies. Here a search for J Present address: CERN, CH-1211 Geneva 23, Switzerland. 2 Supported by CA1CYT, Spain. 3 Supported by the National Science Foundation of China. 4 Permanent address: DESY, D-2000 Hamburg 52, FRG. 5 On leave of absence from SLAC, Stanford, CA 94309, USA. 6 On leave of absence from University of Washington, Seattle, WA 98195, USA. 7 Also at Centre de Physique des Particules, Facult6 des Sci-ences, F-13288 Marseille, France 8 Supported by the Danish Natural Science Research Council. 9 Supported by the UK Science and Engineering Research Council. ~o Supported by SLOAN fellowship, contract BR 2703. ~ Supported by the US Department of Energy, contract DE-FG05-87ER40319. ~2 Supported by the NSF, contract PHY-8451274. ~3 Supported by the US Department of Energy, contract DE-FCOS-85ER250000. 14 Also at Istituto di Fisica Generale, UniversitA di Torino, Turin, Italy. ~5 Also at lstituto di Cosmo-Geofisica del CNR, Turin, Italy. ~6 Supported by the Bundesministerium f'tir Forschung und Technologic, FRG. ~7 Supported by Fonds zur Ftirderung der wissenschaftlichen Forschung, Austria. ~8 Supported by the Institut de Recherche Fondamentale du CEA. ~9 Present address: INFN Milano, Sezione di Milano, 1-20133 Milan, Italy. 2o Permanent address: LBL, Berkeley, CA 94720, USA. 2~ Supported by the US Department of Energy, contract DE-AC02-76ER00881.",

year = "1990",

month = may,

day = "24",

doi = "10.1016/0370-2693(90)91883-D",

language = "English (US)",

volume = "241",

pages = "635--643",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "Elsevier",

number = "4",

}

Decamp, D, Deschizeaux, B, Goy, C, Lees, JP, Minard, MN, Crespo, JM, Delfino, M, Fernandez, E, Martinez, M, Miquel, R, Mir, LM, Orteu, S, Pacheco, A, Perlas, JA, Tubau, E, Catanesi, MG, De Palma, M, Farilla, A, Iaselli, G, Maggi, G, Natali, S, Nuzzo, S, Ranieri, A, Raso, G, Romano, F, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Zito, G, Gao, Y, Hu, H, Huang, D, Jin, S, Lin, J, Ruan, T, Wang, T, Wu, W, Xie, Y, Xu, D, Xu, R, Zhang, J, Zhang, Z, Zhao, W, Albrecht, H, Atwood, WB, Bird, F, Blucher, E, Burnett, TH, Charity, T, Drevermann, H, Garrido, L, Grab, C, Hagelberg, R, Haywood, S, Jost, B, Kaseman, M, Kellner, G, Knobloch, J, Lacourt, A, Lehraus, I, Lohse, T, Lüke, D, Marchioro, A, Mato, P, May, J, Minten, A, Miotto, A, Palazzi, P, Pepe-Altarelli, M, Ranjard, F, Roth, A, Rothberg, J, Rotscheidt, H, Von Rüden, W, St.Denis, R, Schlatter, D, Takashima, M, Talby, M, Taureg, H, Tejessy, W, Wachsmuth, H, Wheeler, S, Wiedenmann, W, Witzeling, W, Wotschack, J, Ajaltouni, Z, Bardadin-Otwinowska, M, Falvard, A, Gay, P, Henrard, P, Jousset, J, Michel, B, Montret, JC, Pallin, D, Perret, P, Proriol, J, Prulhière, F, Hansen, JD, Hansen, JR, Hansen, PH, Møllerud, R, Petersen, G, Simopoulou, E, Vayaki, A, Badier, J, Blondel, A, Bonneaud, G, Bourotte, J, Braems, F, Brient, JC, Ciocci, MA, Fouque, G, Guirlet, R, Rougé, A, Rumpf, M, Tanaka, R, Videau, H, Videau, I, Candlin, DJ, Conti, A, Parrini, G, Corden, M, Georgiopoulos, C, Goldman, JH, Ikeda, M, Lannutti, J, Levinthal, D, Mermikides, M, Sawyer, L, Stimpfl, G, Antonelli, A, Baldini, R, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Chiarella, V, De Ninno, G, D'Ettorre-Piazzoli, B, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, GP, Nicoletti, G, Picchi, P, Zografou, P, Altoon, B, Boyle, O, Halley, AW, Ten Have, I, Hearns, JL, Lynch, JG, Morton, WT, Raine, C, Scarr, JM, Smith, K, Thompson, AS, Brandl, B, Braun, O, Geiges, R, Geweniger, C, Hanke, P, Hepp, V, Kluge, EE, Maumary, Y, Panter, M, Putzer, A, Rensch, B, Stahl, A, Tittel, K, Wunsch, M, Belk, AT, Beuselinck, R, Binnie, DM, Cameron, W, Cattaneo, M, Dornan, PJ, Dugeay, S, Forty, RW, Greene, AM, Hassard, JF, Patton, SJ, Sedgbeer, JK, Taylor, G, Tomalin, IR, Wright, AG, Girtler, P, Kuhn, D, Rudolph, G, Bowdery, CK, Brodbeck, TJ, Finch, AJ, Foster, F, Hughes, G, Keemer, NR, Nuttall, M, Rowlingson, BS, Sloan, T, Snow, SW, Barczewski, T, Bauerdick, LAT, Kleinknecht, K, Renk, B, Roehn, S, Sander, HG, Schmelling, M, Steeg, F, Albanese, JP, Aubert, JJ, Benchouk, C, Bonissent, A, Courvoisier, D, Etienne, F, Matsinos, E, Papalexiou, S, Payre, P, Pietrzyk, B, Qian, Z, Blum, W, Cattaneo, P, Cowan, G, Dehning, B, Dietl, H, Fernandez-Bosman, M, Hauff, D, Jahn, A, Lange, E, Lütjens, G, Lutz, G, Männer, W, Moser, HG, Pan, Y, Richter, R, Schwarz, AS, Settles, R, Stiegler, U, Stierlin, U, Thomas, J, Waltermann, G, Bertin, V, De Bouard, G, Boucrot, J, Callot, O, Chen, X, Cordier, A, Davier, M, Ganis, G, Grivaz, JF, Heusse, P, Janot, P, Journé, V, Kim, DW, Lefrançois, J, Lutz, AM, Veillet, JJ, Zomer, F, Amendolia, SR, Bagliesi, G, Batignani, G, Bosisio, L, Bottigli, U, Bradaschia, C, Ferrante, I, Fidecaro, F, Foà, L, Focardi, E, Forti, F, Giassi, A, Giorgi, MA, Ligabue, F, Lusiani, A, Mannelli, EB, Marrocchesi, PS, Messineo, A, Palla, F, Sanguinetti, G, Scapellato, S, Steinberger, J, Tenchini, R, Tonelli, G, Triggiani, G, Carter, JM, Green, MG, March, PV, Medcalf, T, Saich, MR, Strong, JA, Thomas, RM, Wildish, T, Botterill, DR, Clifft, RW, Edgecock, TR, Edwards, M, Fisher, SM, Harvey, J, Jones, TJ, Norton, PR, Salmon, DP, Thompson, JC, Bloch-Devaux, B, Colas, P, Klopfenstein, C, Lançon, E, Locci, E, Loucatos, S, Mirabito, L, Monnier, E, Perez, P, Perrier, F, Rander, J, Renardy, JF, Roussarie, A, Schuller, JP, Ashman, JG, Booth, CN, Combley, F, Dinsdale, M, Martin, J, Parker, D, Thompson, LF, Brandt, S, Burkhardt, H, Grupen, C, Meinhard, H, Neugebauer, E, Schäfer, U, Seywerd, H, Gobbo, B, Liello, F, Milotti, E, Ragusa, F, Rolandi, L, Bellantoni, L, Boudreau, JF, Cinabro, D, Conway, JS, Cowen, DF, Feng, Z, Harton, JL, Hilgart, J, Jared, RC, Johnson, RP, Leclaire, BW, Pan, YB, Parker, T, Pater, JR, Saadi, Y, Sharma, V, Wear, JA, Weber, FV, Wu, SL, Xue, ST & Zobernig, G 1990, 'Search for decays of the Z⁰ into a photon and a pseudoscalar meson', Physics Letters B, vol. 241, no. 4, pp. 635-643. https://doi.org/10.1016/0370-2693(90)91883-D

TY - JOUR

T1 - Search for decays of the Z0 into a photon and a pseudoscalar meson

AU - Decamp, D.

AU - Deschizeaux, B.

AU - Goy, C.

AU - Lees, J. P.

AU - Minard, M. N.

AU - Crespo, J. M.

AU - Delfino, M.

AU - Fernandez, E.

AU - Martinez, M.

AU - Miquel, R.

AU - Mir, Ll M.

AU - Orteu, S.

AU - Pacheco, A.

AU - Perlas, J. A.

AU - Tubau, E.

AU - Catanesi, M. G.

AU - De Palma, M.

AU - Farilla, A.

AU - Iaselli, G.

AU - Maggi, G.

AU - Natali, S.

AU - Nuzzo, S.

AU - Ranieri, A.

AU - Raso, G.

AU - Romano, F.

AU - Ruggieri, F.

AU - Selvaggi, G.

AU - Silvestris, L.

AU - Tempesta, P.

AU - Zito, G.

AU - Gao, Y.

AU - Hu, H.

AU - Huang, D.

AU - Jin, S.

AU - Lin, J.

AU - Ruan, T.

AU - Wang, T.

AU - Wu, W.

AU - Xie, Y.

AU - Xu, D.

AU - Xu, R.

AU - Zhang, J.

AU - Zhang, Z.

AU - Zhao, W.

AU - Albrecht, H.

AU - Atwood, W. B.

AU - Bird, F.

AU - Blucher, E.

AU - Burnett, T. H.

AU - Charity, T.

AU - Drevermann, H.

AU - Garrido, Ll

AU - Grab, C.

AU - Hagelberg, R.

AU - Haywood, S.

AU - Jost, B.

AU - Kaseman, M.

AU - Kellner, G.

AU - Knobloch, J.

AU - Lacourt, A.

AU - Lehraus, I.

AU - Lohse, T.

AU - Lüke, D.

AU - Marchioro, A.

AU - Mato, P.

AU - May, J.

AU - Minten, A.

AU - Miotto, A.

AU - Palazzi, P.

AU - Pepe-Altarelli, M.

AU - Ranjard, F.

AU - Roth, A.

AU - Rothberg, J.

AU - Rotscheidt, H.

AU - Von Rüden, W.

AU - St.Denis, R.

AU - Schlatter, D.

AU - Takashima, M.

AU - Talby, M.

AU - Taureg, H.

AU - Tejessy, W.

AU - Wachsmuth, H.

AU - Wheeler, S.

AU - Wiedenmann, W.

AU - Witzeling, W.

AU - Wotschack, J.

AU - Ajaltouni, Z.

AU - Bardadin-Otwinowska, M.

AU - Falvard, A.

AU - Gay, P.

AU - Henrard, P.

AU - Jousset, J.

AU - Michel, B.

AU - Montret, J. C.

AU - Pallin, D.

AU - Perret, P.

AU - Proriol, J.

AU - Prulhière, F.

AU - Hansen, J. D.

AU - Hansen, J. R.

AU - Hansen, P. H.

AU - Møllerud, R.

AU - Petersen, G.

AU - Simopoulou, E.

AU - Vayaki, A.

AU - Badier, J.

AU - Blondel, A.

AU - Bonneaud, G.

AU - Bourotte, J.

AU - Braems, F.

AU - Brient, J. C.

AU - Ciocci, M. A.

AU - Fouque, G.

AU - Guirlet, R.

AU - Rougé, A.

AU - Rumpf, M.

AU - Tanaka, R.

AU - Videau, H.

AU - Videau, I.

AU - Candlin, D. J.

AU - Conti, A.

AU - Parrini, G.

AU - Corden, M.

AU - Georgiopoulos, C.

AU - Goldman, J. H.

AU - Ikeda, M.

AU - Lannutti, J.

AU - Levinthal, D.

AU - Mermikides, M.

AU - Sawyer, L.

AU - Stimpfl, G.

AU - Antonelli, A.

AU - Baldini, R.

AU - Bencivenni, G.

AU - Bologna, G.

AU - Bossi, F.

AU - Campana, P.

AU - Capon, G.

AU - Chiarella, V.

AU - De Ninno, G.

AU - D'Ettorre-Piazzoli, B.

AU - Felici, G.

AU - Laurelli, P.

AU - Mannocchi, G.

AU - Murtas, F.

AU - Murtas, G. P.

AU - Nicoletti, G.

AU - Picchi, P.

AU - Zografou, P.

AU - Altoon, B.

AU - Boyle, O.

AU - Halley, A. W.

AU - Ten Have, I.

AU - Hearns, J. L.

AU - Lynch, J. G.

AU - Morton, W. T.

AU - Raine, C.

AU - Scarr, J. M.

AU - Smith, K.

AU - Thompson, A. S.

AU - Brandl, B.

AU - Braun, O.

AU - Geiges, R.

AU - Geweniger, C.

AU - Hanke, P.

AU - Hepp, V.

AU - Kluge, E. E.

AU - Maumary, Y.

AU - Panter, M.

AU - Putzer, A.

AU - Rensch, B.

AU - Stahl, A.

AU - Tittel, K.

AU - Wunsch, M.

AU - Belk, A. T.

AU - Beuselinck, R.

AU - Binnie, D. M.

AU - Cameron, W.

AU - Cattaneo, M.

AU - Dornan, P. J.

AU - Dugeay, S.

AU - Forty, R. W.

AU - Greene, A. M.

AU - Hassard, J. F.

AU - Patton, S. J.

AU - Sedgbeer, J. K.

AU - Taylor, G.

AU - Tomalin, I. R.

AU - Wright, A. G.

AU - Girtler, P.

AU - Kuhn, D.

AU - Rudolph, G.

AU - Bowdery, C. K.

AU - Brodbeck, T. J.

AU - Finch, A. J.

AU - Foster, F.

AU - Hughes, G.

AU - Keemer, N. R.

AU - Nuttall, M.

AU - Rowlingson, B. S.

AU - Sloan, T.

AU - Snow, S. W.

AU - Barczewski, T.

AU - Bauerdick, L. A.T.

AU - Kleinknecht, K.

AU - Renk, B.

AU - Roehn, S.

AU - Sander, H. G.

AU - Schmelling, M.

AU - Steeg, F.

AU - Albanese, J. P.

AU - Aubert, J. J.

AU - Benchouk, C.

AU - Bonissent, A.

AU - Courvoisier, D.

AU - Etienne, F.

AU - Matsinos, E.

AU - Papalexiou, S.

AU - Payre, P.

AU - Pietrzyk, B.

AU - Qian, Z.

AU - Blum, W.

AU - Cattaneo, P.

AU - Cowan, G.

AU - Dehning, B.

AU - Dietl, H.

AU - Fernandez-Bosman, M.

AU - Hauff, D.

AU - Jahn, A.

AU - Lange, E.

AU - Lütjens, G.

AU - Lutz, G.

AU - Männer, W.

AU - Moser, H. G.

AU - Pan, Y.

AU - Richter, R.

AU - Schwarz, A. S.

AU - Settles, R.

AU - Stiegler, U.

AU - Stierlin, U.

AU - Thomas, J.

AU - Waltermann, G.

AU - Bertin, V.

AU - De Bouard, G.

AU - Boucrot, J.

AU - Callot, O.

AU - Chen, X.

AU - Cordier, A.

AU - Davier, M.

AU - Ganis, G.

AU - Grivaz, J. F.

AU - Heusse, Ph

AU - Janot, P.

AU - Journé, V.

AU - Kim, D. W.

AU - Lefrançois, J.

AU - Lutz, A. M.

AU - Veillet, J. J.

AU - Zomer, F.

AU - Amendolia, S. R.

AU - Bagliesi, G.

AU - Batignani, G.

AU - Bosisio, L.

AU - Bottigli, U.

AU - Bradaschia, C.

AU - Ferrante, I.

AU - Fidecaro, F.

AU - Foà, L.

AU - Focardi, E.

AU - Forti, F.

AU - Giassi, A.

AU - Giorgi, M. A.

AU - Ligabue, F.

AU - Lusiani, A.

AU - Mannelli, E. B.

AU - Marrocchesi, P. S.

AU - Messineo, A.

AU - Palla, F.

AU - Sanguinetti, G.

AU - Scapellato, S.

AU - Steinberger, J.

AU - Tenchini, R.

AU - Tonelli, G.

AU - Triggiani, G.

AU - Carter, J. M.

AU - Green, M. G.

AU - March, P. V.

AU - Medcalf, T.

AU - Saich, M. R.

AU - Strong, J. A.

AU - Thomas, R. M.

AU - Wildish, T.

AU - Botterill, D. R.

AU - Clifft, R. W.

AU - Edgecock, T. R.

AU - Edwards, M.

AU - Fisher, S. M.

AU - Harvey, J.

AU - Jones, T. J.

AU - Norton, P. R.

AU - Salmon, D. P.

AU - Thompson, J. C.

AU - Bloch-Devaux, B.

AU - Colas, P.

AU - Klopfenstein, C.

AU - Lançon, E.

AU - Locci, E.

AU - Loucatos, S.

AU - Mirabito, L.

AU - Monnier, E.

AU - Perez, P.

AU - Perrier, F.

AU - Rander, J.

AU - Renardy, J. F.

AU - Roussarie, A.

AU - Schuller, J. P.

AU - Ashman, J. G.

AU - Booth, C. N.

AU - Combley, F.

AU - Dinsdale, M.

AU - Martin, J.

AU - Parker, D.

AU - Thompson, L. F.

AU - Brandt, S.

AU - Burkhardt, H.

AU - Grupen, C.

AU - Meinhard, H.

AU - Neugebauer, E.

AU - Schäfer, U.

AU - Seywerd, H.

AU - Gobbo, B.

AU - Liello, F.

AU - Milotti, E.

AU - Ragusa, F.

AU - Rolandi, L.

AU - Bellantoni, L.

AU - Boudreau, J. F.

AU - Cinabro, D.

AU - Conway, J. S.

AU - Cowen, D. F.

AU - Feng, Z.

AU - Harton, J. L.

AU - Hilgart, J.

AU - Jared, R. C.

AU - Johnson, R. P.

AU - Leclaire, B. W.

AU - Pan, Y. B.

AU - Parker, T.

AU - Pater, J. R.

AU - Saadi, Y.

AU - Sharma, V.

AU - Wear, J. A.

AU - Weber, F. V.

AU - Wu, Sau Lan

AU - Xue, S. T.

AU - Zobernig, G.

N1 - Funding Information: The decay branching ratio of the Z ° into a photon and a light pseudoscalar meson is predicted by the standard model to be unobservably small \[ 1 \]. However it has been argued recently that such a decay could occur at a rate accessible to the LEP experiments \[2 -4 \]. Indeed, the branching ratio for the decay Z°-.n° 7 could be as large as 1.7X 10 -3 if the hypothesis of the partially conserved axial current (PCAC) still holds at LEP energies. Here a search for J Present address: CERN, CH-1211 Geneva 23, Switzerland. 2 Supported by CA1CYT, Spain. 3 Supported by the National Science Foundation of China. 4 Permanent address: DESY, D-2000 Hamburg 52, FRG. 5 On leave of absence from SLAC, Stanford, CA 94309, USA. 6 On leave of absence from University of Washington, Seattle, WA 98195, USA. 7 Also at Centre de Physique des Particules, Facult6 des Sci-ences, F-13288 Marseille, France 8 Supported by the Danish Natural Science Research Council. 9 Supported by the UK Science and Engineering Research Council. ~o Supported by SLOAN fellowship, contract BR 2703. ~ Supported by the US Department of Energy, contract DE-FG05-87ER40319. ~2 Supported by the NSF, contract PHY-8451274. ~3 Supported by the US Department of Energy, contract DE-FCOS-85ER250000. 14 Also at Istituto di Fisica Generale, UniversitA di Torino, Turin, Italy. ~5 Also at lstituto di Cosmo-Geofisica del CNR, Turin, Italy. ~6 Supported by the Bundesministerium f'tir Forschung und Technologic, FRG. ~7 Supported by Fonds zur Ftirderung der wissenschaftlichen Forschung, Austria. ~8 Supported by the Institut de Recherche Fondamentale du CEA. ~9 Present address: INFN Milano, Sezione di Milano, 1-20133 Milan, Italy. 2o Permanent address: LBL, Berkeley, CA 94720, USA. 2~ Supported by the US Department of Energy, contract DE-AC02-76ER00881.

PY - 1990/5/24

Y1 - 1990/5/24

N2 - A search is reported for decays of the Z0 into π0γ, ηγ and η′ (958)γ in e+e- collisions using data collected during a scan around the Z0 mass. In order to search for π0γ final states, in which the two photons from the π0 decay are unresolved, the production of pairs of high-energy electromagnetic clusters is studied. The data are compared with the expectations from the pure QED process e+e- → γγ, and a 95% confidence level upper limit on the branching ratio of the Z0 into π0γ of 4.9 × 10-4 is derived. For η′γ, the decay modes of the mesons that contain two charged particles are largely free from QED background. These modes are used to place upper limits of 4.6 × 10-4 and 2.2 × 10-4 on the corresponding branching ratios of the Z0.

AB - A search is reported for decays of the Z0 into π0γ, ηγ and η′ (958)γ in e+e- collisions using data collected during a scan around the Z0 mass. In order to search for π0γ final states, in which the two photons from the π0 decay are unresolved, the production of pairs of high-energy electromagnetic clusters is studied. The data are compared with the expectations from the pure QED process e+e- → γγ, and a 95% confidence level upper limit on the branching ratio of the Z0 into π0γ of 4.9 × 10-4 is derived. For η′γ, the decay modes of the mesons that contain two charged particles are largely free from QED background. These modes are used to place upper limits of 4.6 × 10-4 and 2.2 × 10-4 on the corresponding branching ratios of the Z0.

UR - http://www.scopus.com/inward/record.url?scp=13644262173&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=13644262173&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(90)91883-D

DO - 10.1016/0370-2693(90)91883-D

M3 - Article

AN - SCOPUS:13644262173

SN - 0370-2693

VL - 241

SP - 635

EP - 643

JO - Physics Letters B

JF - Physics Letters B

IS - 4

ER -

Search for decays of the Z⁰ into a photon and a pseudoscalar meson

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