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arXiv · 2607.17850

First Observation of an Exotic Reggeon

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·V. Benesova·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. Dunnweber·R. R. Dusaev·D. Ecker·P. Faccioli·M. Faessler·M. Finger·M. jr Finger·H. Fischer·K. J. Flothner·W. Florian·J. M. Friedrich·V. Frolov·L. G. Garcia Ordonez·O. P. Gavrichtchouk·S. Gerassimov·J. Giarra·D. Giordano·A. Grasso·A. Gridin·M. Grosse Perdekamp·B. Grube·M. Gruner·A. Guskov·P. Haas·D. von Harrach·M. Hoffmann·N. d'Hose·C. -Y. Hsieh·S. Ishimoto·A. Ivanov·T. Iwata·V. Jary·E. Jelinkova·R. Joosten·E. Kabuss·F. Kaspar·A. Kerbizi·B. Ketzer·G. V. Khaustov·T. Klasek·J. H. Koivuniemi·V. N. Kolosov·K. Kondo Horikawa·I. Konorov·A. Yu. Korzenev·A. M. Kotzinian·O. M. Kouznetsov·A. Koval·F. Kunne·K. Kurek·R. P. Kurjata·G. Kurten·A. Kveton·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. Matousek
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Abstract

We present new \compass high-statistics measurements of the peripheral production of $\eta \pi^-$ and $\eta^\prime \pi^-$ pairs in the reactions $\pi^- p \to \eta^{(\prime)}\pi^- p$. For the first time, we perform an unbinned analysis of the high-mass region of the $\eta\pi^-$ and $\eta^\prime\pi^-$ systems, which allows us to disentangle the exchange mechanisms governing their production. We report the first observation in high-energy scattering of an exotic Reggeon with high significance exceeding $5\,\sigma$ for both channels, which is, most likely, related to the exotic $\pi_1(1600)$.8

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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, V. Benesova, 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. Dunnweber, R. R. Dusaev, D. Ecker, P. Faccioli, M. Faessler, M. Finger, M. jr Finger, H. Fischer, K. J. Flothner, W. Florian, J. M. Friedrich, V. Frolov, L. G. Garcia Ordonez, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, A. Grasso, A. Gridin, M. Grosse Perdekamp, B. Grube, M. Gruner, A. Guskov, P. Haas, D. von Harrach, M. Hoffmann, N. d'Hose, C. -Y. Hsieh, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, E. Jelinkova, R. Joosten, E. Kabuss, F. Kaspar, A. Kerbizi, B. Ketzer, G. V. Khaustov, T. Klasek, J. H. Koivuniemi, V. N. Kolosov, K. Kondo Horikawa, I. Konorov, A. Yu. Korzenev, A. M. Kotzinian, O. M. Kouznetsov, A. Koval, F. Kunne, K. Kurek, R. P. Kurjata, G. Kurten, A. Kveton, 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. Matousek. 2026-07-20. First Observation of an Exotic Reggeon. https://arxiv.org/abs/2607.17850

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