1998Physical Review LettersOpen access

Experimental Search for Chargino and Neutralino Production in Supersymmetry Models with a Light Gravitino

B. Abbott, M. Abolins, B. S. Acharya, И. Адам, D. L. Adams, Mark Raymond Adams, S. Ahn, H. Aihara, G. A. Alves, E. Amidi, N. Amos, E. W. Anderson, R. Astur, M. M. Baarmand, A. Baden, V. Balamurali, J. Balderston, B. Baldin, S. Banerjee, J. Bantly, J. F. Bartlett, K. Bazizi, A. Belyaev, S. B. Beri, I. A. Bertram, V. A. Bezzubov, P. C. Bhat, V. Bhatnagar, M. Bhattacharjee, N. N. Biswas, G. Blazey, S. Blessing, P. C. Bloom, A. Boehnlein, N. I. Bojko, F. Borcherding, C. Boswell, A. Brandt, R. Brock, A. Bross, D. Buchholz, В. С. Буртовой, J. M. Butler, W. Carvalho, D. Casey, Z. Casilum, H. Castilla-Valdez, D. Chakraborty, S.-M. Chang, S. V. Chekulaev, L.-P. Chen, W. Chen, S. Choi, S. Chopra, B. C. Choudhary, J. H. Christenson, M. Chung, D. R. Claes, A. R. Clark, W. G. Cobau, J. Cochran, W. E. Cooper, C. Cretsinger, D. Cullen-Vidal, M.A.C. Cummings, D. Cutts, O. I. Dahl, K. Davis, K. De, K. Del Signore, M. Demarteau, D. Denisov, S. P. Denisov, H. T. Diehl, M. Diesburg, G. Di Loreto, P. Draper, Y. Ducros, L. Dudko, S. R. Dugad, D. Edmunds, J. Ellison, V. D. Elvira, R. Engelmann, S. C. Eno, G. Eppley, P. Ermolov, O. V. Eroshin, В. Н. Евдокимов, T. Fahland, M. Fatyga, M. Fatyga, J. Featherly, S. Fehér, D. Fein, T. Ferbel, G. Finocchiaro, H. E. Fisk, Y. Fisyak, E. Flattum, G. E. Forden, M. Fortner, K. C. Frame, S. Fuess, E. J. Gallas, A. N. Galyaev, P. Gartung, T. L. Geld, R. J. Genik, K. Genser, C. E. Gerber, B. Gibbard, S. Glenn, B. Gobbi, M. Goforth, A. Goldschmidt, B. Gómez, G. Gómez, P. I. Goncharov, J. L. González Solís, H. A. Gordon, L. T. Goss, K. Gounder, A. G. Goussiou, N. Graf, P. D. Grannis, D. R. Green, J. Green, H. Greenlee, G. Grim, S. Grinstein, N. Grossman, P. Grudberg, S. Grünendahl, G. Guglielmo, J. A. Guida, J. M. Guida, A. Gupta, S. N. Gurzhiev, P. Gutierrez, Y. E. Gutnikov, N. J. Hadley, H. Haggerty, S. Hagopian, V. Hagopian, K. S. Hahn, R. E. Hall, P. Hanlet, S. Hansen, J. M. Hauptman, D. Hedin, A. P. Heinson, U. Heintz, R. Hernández-Montoya, T. Heuring, R. Hirosky, J. D. Hobbs, B. Hoeneisen, J. S. Hoftun, F. Hsieh, Ting Hu, Tong Hu, T. Huehn, A. S. Ito, E. James, J. Jaques, S. A. Jerger, R. Jesik, Jun Jiang, T. Joffe–Minor, K. A. Johns, Mark D. Johnson, A. Jonckheere, M. Jones, H. Jöstlein, S. Y. Jun, C. K. Jung, S. Kahn, G. Kalbfleisch, J. S. Kang, R. Kehoe, M. Kelly, C. L. Kim, S. K. Kim, A. Klatchko, B. Klima, C. Klopfenstein, V. Klyukhin, V. Kochetkov, J. M. Kohli, D. Koltick, A. V. Kostritskiy, J. Kotcher, A. Kotwal, J. Kourlas, A. V. Kozelov, E. A. Kozlovski, J. Krane, M. R. Krishnaswamy, S. Krzywdziński, S. Kunori, S. Lami, H. Lan, R. Lander, F. Landry, G. Landsberg, B. Lauer, A. Leflat, H. Li, J. Li, Q. Z. Li-Demarteau, J. G. R. Lima, D. Lincoln, S. L. Linn, J. Linnemann, R. Lipton, Q. Liu, Y. C. Liu, F. Lobkowicz, S. Loken, S. Lökòs, L. Lueking, A. L. Lyon, A. K. A. Maciel, R. J. Madaras, R. Madden, L. Magaña-Mendoza, S. Mani, H. S. Mao, R. Markeloff, T. Marshall, M. I. Martin, K. M. Mauritz, B. May, A. A. Mayorov, R. McCarthy, J. McDonald, T. McKibben, J. McKinley, T. R. McMahon, H. L. Melanson, M. Merkin, K. W. Merritt, H. Miettinen, A. I. Mincer, C. S. Mishra, N. Mokhov, N. K. Mondal, Hugh Montgomery, P. Mooney, H. da Motta, C. Murphy, F. Nang, M. Narain, V. S. Narasimham, A. Narayanan, H. A. Neal, J. P. Negret, P. Némethy, M. Nicola, D. Norman, L. Oesch, V. Oguri, E. Oltman, N. Oshima, D. Owen, P. Padley, M. Pang, A. Para, Y. M. Park, R. Partridge, N. Parua, M. Paterno, J. Perkins, M. Peters, R. Piegaia, H. Piekarz, Y. Pischalnikov, V. M. Podstavkov, B. G. Pope, H. Prosper, S. Protopopescu, J. Qian, P. Z. Quintas, R. Raja, S. Rajagopalan, O. Ramírez, L. Rasmussen, S. Reucroft, M. Rijssenbeek, T. Rockwell, N. A. Roe, P. Rubinov, R. Ruchti, J. P. Rutherfoord, A. Sánchez-Hernández, A. Santoro, L. Sawyer, R. D. Schamberger, H. Schellman, J. Sculli, E. Shabalina, C. Shaffer, H. C. Shankar, R. K. Shivpuri, M. Shupe, H. Singh, J. B. Singh, V. Sirotenko, W. Smart, R. P. Smith, R. Snihur, G. R. Snow, J. Snow, S. Snyder, J. Solomon, P. M. Sood, M. Sosebee, N. Sotnikova, M. Souza, A. L. Spadafora, R. W. Stephens, M. L. Stevenson, D. Stewart, F. Stichelbaut, D. A. Stoianova, D. P. Stoker, M. Strauss, K. Streets, M. Strovink, A. Sznajder, P. Tamburello, J. Tarazi, M. Tartaglia, T. L. Thomas, J. Thompson, T. G. Trippe, P. M. Tuts, N. Varelas, E. W. Varnes, D. Vititoe, A. A. Volkov, A. P. Vorobiev, H. D. Wahl, G. Wang, J. Warchol, G. Watts, M. Wayne, H. Weerts, M. J. White, J. T. White, J. A. Wightman, S. Willis, S. J. Wimpenny, J. V. D. Wirjawan, J. Womersley, E. Won, D. Wood, H. Xu, R. Yamada, P. Yamin, C. Yanagisawa, J. Yang, T. Yasuda, P. Yepes, C. Yoshikawa, S. Youssef, J. Yu, Y. Yu, Z. H. Zhu, D. Ziemińska, A. Ziemiński, E. G. Zverev, A. Zylberstejn

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Abstract

We search for inclusive high ${E}_{T}$ diphoton events with large missing transverse energy in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\phantom{\rule{0ex}{0ex}}\mathrm{TeV}$. Such events are expected from pair production of charginos and neutralinos within the framework of the minimal supersymmetric standard model with a light gravitino. No excess of events is observed. In that model, and assuming gaugino mass unification at the GUT scale, we obtain a 95% C.L. exclusion region in the supersymmetry parameter space and lower mass bounds of $150\mathrm{GeV}{/c}^{2}$ for the lightest chargino and $77\mathrm{GeV}{/c}^{2}$ for the lightest neutralino.

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We search for inclusive high ${E}_{T}$ diphoton events with large missing transverse energy in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\phantom{\rule{0ex}{0ex}}\mathrm{TeV}$. Such events are expected from pair production of charginos and neutralinos within the framework of the minimal supersymmetric standard model with a light gravitino. No excess of events is observed. In that model, and assuming gaugino mass unification at the GUT scale, we obtain a 95% C.L. exclusion region in the supersymmetry parameter space and lower mass bounds of $150\mathrm{GeV}{/c}^{2}$ for the lightest chargino and $77\mathrm{GeV}{/c}^{2}$ for the lightest neutralino.

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Available abstract

We search for inclusive high ${E}_{T}$ diphoton events with large missing transverse energy in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\phantom{\rule{0ex}{0ex}}\mathrm{TeV}$. Such events are expected from pair production of charginos and neutralinos within the framework of the minimal supersymmetric standard model with a light gravitino. No excess of events is observed. In that model, and assuming gaugino mass unification at the GUT scale, we obtain a 95% C.L. exclusion region in the supersymmetry parameter space and lower mass bounds of $150\mathrm{GeV}{/c}^{2}$ for the lightest chargino and $77\mathrm{GeV}{/c}^{2}$ for the lightest neutralino.

Key concepts: Neutralino, Chargino, Physics, Gravitino, Particle physics, Gaugino, Supersymmetry, Production (economics)

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