Formation of the S = -1 resonance X(2265) in the reaction pp → X + K+ at 2.50 and 2.85 GeV

P. Kienle, M. Maggiora, K. Suzuki, T. Yamazaki, M. Alexeev, F. Balestra, Y. Bedfer, R. Bertini, L. C. Bland, A. Brenschede, F. Brochard, M. P. Bussa, M. Chiosso, Seonho Choi, M. L. Colantoni, R. Dressler, M. Dzemidzic, J. Cl Faivre, A. Ferrero, L. FerreroJ. Foryciarz, I. Fröhlich, V. Frolov, R. Garfagnini, A. Grasso, S. Heinz, W. W. Jacobs, W. Kühn, A. Maggiora, D. Panzieri, H. W. Pfaff, G. Pontecorvo, A. Popov, J. Ritman, P. Salabura, V. Tchalyshev, F. Tosello, S. E. Vigdor, G. Zosi

Research output: Contribution to journalLetter

15 Scopus citations


Analyzing DISTO data of pp → pΛK+ at Tp = 2.50 and 2.85 GeV to populate a previously reported X(2265)-resonance with MX = 2267MeV/c2 and ΓX = 118MeV at 2.85 GeV, we found that the yield of X(2265) at 2.50 GeV is much less than that at 2.85 GeV (less than 10%), though it is expected from a kinematical consideration to be produced as much as 33% of that at 2.85 GeV. The small population of X(2265) at 2.50 GeV is consistent with the very weak production of Λ(1405) at the same incident energy toward its production threshold, thus indicating that Λ(1405) plays an important role as a doorway state for the formation of X(2265).

Original languageEnglish (US)
Article number183
Pages (from-to)1-5
Number of pages5
JournalEuropean Physical Journal A
Issue number12
StatePublished - Jan 1 2012
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Kienle, P., Maggiora, M., Suzuki, K., Yamazaki, T., Alexeev, M., Balestra, F., Bedfer, Y., Bertini, R., Bland, L. C., Brenschede, A., Brochard, F., Bussa, M. P., Chiosso, M., Choi, S., Colantoni, M. L., Dressler, R., Dzemidzic, M., Faivre, J. C., Ferrero, A., ... Zosi, G. (2012). Formation of the S = -1 resonance X(2265) in the reaction pp → X + K+ at 2.50 and 2.85 GeV. European Physical Journal A, 48(12), 1-5. [183].