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arXiv · 2504.09470

Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^P=0^-$

G. D. Alexeev·M. G. Alexeev·C. Alice·A. Amoroso·V. Andrieux·V. Anosov·K. Augsten·W. Augustyniak·C. D. R. Azevedo·B. Badelek·R. Beck·J. Beckers·Y. Bedfer·J. Bernhard·F. Bradamante·A. Bressan·W. -C. Chang·C. Chatterjee·M. Chiosso·S. -U. Chung·A. Cicuttin·M. L. Crespo·D. D'Ago·S. Dalla Torre·S. S. Dasgupta·S. Dasgupta·F. Delcarro·I. Denisenko·O. Yu. Denisov·S. V. Donskov·N. Doshita·Ch. Dreisbach·W. Dünnweber·R. R. Dusaev·D. Ecker·P. Faccioli·M. Faessler·M. Finger·M. Finger jr.·H. Fischer·K. J. Flöthner·W. Florian·J. M. Friedrich·V. Frolov·L. G. Garcia Ordònez·O. P. Gavrichtchouk·S. Gerassimov·J. Giarra·D. Giordano·A. Grasso·A. Gridin·M. Grosse Perdekamp·B. Grube·M. Grüner·A. Guskov·P. Haas·D. von Harrach·M. Hoffmann·N. d'Hose·C. -Y. Hsieh·S. Ishimoto·A. Ivanov·T. Iwata·V. Jary·R. Joosten·E. Kabuß·F. Kaspar·A. Kerbizi·B. Ketzer·G. V. Khaustov·J. H. Koivuniemi·V. N. Kolosov·K. Kondo Horikawa·I. Konorov·A. Yu. Korzenev·A. M. Kotzinian·O. M. Kouznetsov·A. Koval·F. Krinner·F. Kunne·K. Kurek·R. P. Kurjata·G. Kurten·K. Lavickova·S. Levorato·Y. -S. Lian·J. Lichtenstadt·P. -J. Lin·R. Longo·V. E. Lyubovitskij·A. Maggiora·N. Makke·G. K. Mallot·A. Maltsev·A. Martin·J. Marzec·J. Matoušek·T. Matsuda·C. Menezes Pires·F. Metzger
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Abstract

We measured the strange-meson spectrum in the scattering reaction $K^{-}+p \rightarrow K^{-}\pi^{-}\pi^{-}+p$ with the COMPASS spectrometer at CERN. Using the world's largest sample of this reaction, we performed a comprehensive partial-wave analysis of the mesonic final state. It substantially extends the strange-meson spectrum covering twelve states with masses up to 2.4 GeV/$c^2$. We observe the first candidate for a crypto-exotic strange meson with $J^{P}=0^{-}$ and find $K_3$ and $K_4$ states consistent with predictions for the ground states.

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G. D. Alexeev, M. G. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C. D. R. Azevedo, B. Badelek, R. Beck, J. Beckers, Y. Bedfer, J. Bernhard, F. Bradamante, A. Bressan, W. -C. Chang, C. Chatterjee, M. Chiosso, S. -U. Chung, A. Cicuttin, M. L. Crespo, D. D'Ago, S. Dalla Torre, S. S. Dasgupta, S. Dasgupta, F. Delcarro, I. Denisenko, O. Yu. Denisov, S. V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R. R. Dusaev, D. Ecker, P. Faccioli, M. Faessler, M. Finger, M. Finger jr., H. Fischer, K. J. Flöthner, W. Florian, J. M. Friedrich, V. Frolov, L. G. Garcia Ordònez, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Grüner, A. Guskov, P. Haas, D. von Harrach, M. Hoffmann, N. d'Hose, C. -Y. Hsieh, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, G. V. Khaustov, J. H. Koivuniemi, V. N. Kolosov, K. Kondo Horikawa, I. Konorov, A. Yu. Korzenev, A. M. Kotzinian, O. M. Kouznetsov, A. Koval, F. Krinner, F. Kunne, K. Kurek, R. P. Kurjata, G. Kurten, K. Lavickova, S. Levorato, Y. -S. Lian, J. Lichtenstadt, P. -J. Lin, R. Longo, V. E. Lyubovitskij, A. Maggiora, N. Makke, G. K. Mallot, A. Maltsev, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, C. Menezes Pires, F. Metzger. 2025-04-13. Spectroscopy of Strange Mesons and First Observation of a Strange Crypto-Exotic State with $J^P=0^-$. https://arxiv.org/abs/2504.09470

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