Observation of a 1750 MeV/c2 enhancement in the diffractive photoproduction of K+ K-

J. M. Link, M. Reyes, P. M. Yager, J. C. Anjos, I. Bediaga, C. Göbel, J. Magnin, A. Massafferri, J. M. de Miranda, I. M. Pepe, A. C. dos Reis, S. Carrillo, E. Casimiro, E. Cuautle, A. Sánchez-Hernández, C. Uribe, F. Vázquez, L. Agostino, L. Cinquini, J. P. CumalatB. O'Reilly, J. E. Ramirez, I. Segoni, J. N. Butler, H. W.K. Cheung, G. Chiodini, I. Gaines, P. H. Garbincius, L. A. Garren, E. Gottschalk, P. H. Kasper, A. E. Kreymer, R. Kutschke, L. Benussi, S. Bianco, F. L. Fabbri, A. Zallo, C. Cawlfield, D. Y. Kim, K. S. Park, A. Rahimi, J. Wiss, R. Gardner, A. Kryemadhi, C. H. Chang, Y. S. Chung, J. S. Kang, B. R. Ko, J. W. Kwak, K. B. Lee, K. Cho, H. Park, G. Alimonti, S. Barberis, A. Cerutti, M. Boschini, P. D'Angelo, M. DiCorato, P. Dini, L. Edera, S. Erba, M. Giammarchi, P. Inzani, F. Leveraro, S. Malvezzi, D. Menasce, M. Mezzadri, L. Moroni, D. Pedrini, C. Pontoglio, F. Prelz, M. Rovere, S. Sala, T. F. Davenport, V. Arena, G. Boca, G. Bonomi, G. Gianini, G. Liguori, M. M. Merlo, D. Pantea, S. P. Ratti, C. Riccardi, P. Vitulo, H. Hernandez, A. M. Lopez, H. Mendez, L. Mendez, E. Montiel, D. Olaya, A. Paris, J. Quinones, C. Rivera, W. Xiong, Y. Zhang, J. R. Wilson, T. Handler, R. Mitchell, D. Engh, M. Hosack, W. E. Johns, M. Nehring, P. D. Sheldon, K. Stenson, E. W. Vaandering, M. Webster, M. Sheaff

Research output: Contribution to journalArticlepeer-review

Abstract

Using the FOCUS spectrometer with photon beam energies between 20 and 160 GeV, we confirm the existence of a diffractively photoproduced enhancement in K+K- at 1750 MeV/c2 with nearly 100 times the statistics of previous experiments. Assuming this enhancement to be a single resonance with a Breit-Wigner mass shape, we determine its mass to be 1753.5 ± 1.5 ± 2.3 MeV/c2 and its width to be 122.2 ± 6.2 ± 8.0 MeV/c2. We find no corresponding enhancement at 1750 MeV/c2 in K*K, and again neglecting any possible interference effects we place limits on the ratio Γ(X(1750) → K*K)/Γ(X(1750) → K+K-). Our results are consistent with previous photoproduction experiments, but, because of the much greater statistics, challenge the common interpretation of this enhancement as the φ(1680) seen in e+e- annihilation experiments.

Original languageEnglish (US)
Pages (from-to)50-56
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume545
Issue number1-2
DOIs
StatePublished - Oct 3 2002

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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