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New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment

A. Jackura C. Fernández-Ramírez A. Pilloni V. Mathieu J. Nys V. Pauk A.P. Szczepaniak G. Fox M. Aghasyan R. Akhunzyanov M.G. Alexeev G.D. Alexeev A. Amoroso V. Andrieux 1 N.V. Anfimov V. Anosov A. Antoshkin K. Augsten W. Augustyniak A. Austregesilo C.D.R. Azevedo B. Badełek F. Balestra M. Ball J. Barth R. Beck Y. Bedfer 1 J. Bernhard K. Bicker E.R. Bielert R. Birsa M. Bodlak P. Bordalo F. Bradamante A. Bressan M. Büchele V.E. Burtsev W.-C. Chang C. Chatterjee M. Chiosso I. Choi A.G. Chumakov S.-U. Chung A. Cicuttin M.L. Crespo S. Dalla Torre S.S. Dasgupta O.Yu. Denisov L. Dhara S.V. Donskov N. Doshita Ch. Dreisbach W. Dünnweber R.R. Dusaev M. Dziewiecki A. Efremov P.D. Eversheim M. Faessler A. Ferrero 1 M. Finger H. Fischer C. Franco N. Du Fresne von Hohenesche J.M. Friedrich V. Frolov E. Fuchey 1 F. Gautheron O.P. Gavrichtchouk S. Gerassimov J. Giarra F. Giordano I. Gnesi M. Gorzellik A. Grasso M. Grosse Perdekamp B. Grube T. Grussenmeyer A. Guskov D. Hahne G. Hamar D. von Harrach F.H. Heinsius R. Heitz F. Herrmann N. Horikawa N. d'Hose 1 C.-Y. Hsieh S. Huber S. Ishimoto A. Ivanov Yu. Ivanshin T. Iwata V. Jary R. Joosten P. Jörg E. Kabuß A. Kerbizi B. Ketzer G.V. Khaustov Yu.A. Khokhlov Yu. Kisselev F. Klein J.H. Koivuniemi V.N. Kolosov K. Kondo K. Königsmann I. Konorov V.F. Konstantinov A.M. Kotzinian O.M. Kouznetsov Z. Kral M. Krämer P. Kremser F. Krinner Z.V. Kroumchtein Y. Kulinich F. Kunne 1 K. Kurek R.P. Kurjata I.I. Kuznetsov A. Kveton A.A. Lednev E.A. Levchenko M. Levillain 1 S. Levorato Y.-S. Lian J. Lichtenstadt R. Longo V.E. Lyubovitskij A. Maggiora A. Magnon N. Makins N. Makke G.K. Mallot S.A. Mamon B. Marianski A. Martin J. Marzec H. Matsuda T. Matsuda G.V. Meshcheryakov M. Meyer 1 W. Meyer Yu.V. Mikhailov M. Mikhasenko E. Mitrofanov N. Mitrofanov Y. Miyachi A. Nagaytsev F. Nerling D. Neyret 1 J. Nový W.-D. Nowak G. Nukazuka A.S. Nunes A.G. Olshevsky I. Orlov M. Ostrick D. Panzieri B. Parsamyan S. Paul J.-C. Peng F. Pereira M. Pešek M. Pešková D.V. Peshekhonov N. Pierre 1 S. Platchkov 1 J. Pochodzalla V.A. Polyakov J. Pretz M. Quaresma C. Quintans S. Ramos C. Regali G. Reicherz C. Riedl N.S. Rogacheva D.I. Ryabchikov A. Rybnikov A. Rychter R. Salac V.D. Samoylenko A. Sandacz C. Santos S. Sarkar I.A. Savin T. Sawada G. Sbrizzai P. Schiavon T. Schlüter K. Schmidt H. Schmieden K. Schönning E. Seder 1 A. Selyunin L. Silva L. Sinha S. Sirtl M. Slunecka J. Smolik A. Srnka D. Steffen M. Stolarski O. Subrt M. Sulc H. Suzuki T. Szameitat P. Sznajder M. Tasevsky S. Tessaro F. Tessarotto A. Thiel J. Tomsa F. Tosello V. Tskhay S. Uhl B.I. Vasilishin A. Vauth J. Veloso A. Vidon 1 M. Virius S. Wallner T. Weisrock M. Wilfert J. ter Wolbeek K. Zaremba P. Zavada M. Zavertyaev E. Zemlyanichkina N. Zhuravlev M. Ziembicki
Abstract : We present a new amplitude analysis of the ηπ D -wave in the reaction π−p→ηπ−p measured by COMPASS. Employing an analytical model based on the principles of the relativistic S -matrix, we find two resonances that can be identified with the a2(1320) and the excited a2′(1700) , and perform a comprehensive analysis of their pole positions. For the mass and width of the a2 we find M=(1307±1±6) MeV and Γ=(112±1±8) MeV, and for the excited state a2′ we obtain M=(1720±10±60) MeV and Γ=(280±10±70) MeV, respectively.
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https://hal.archives-ouvertes.fr/hal-01757858
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Submitted on : Wednesday, April 4, 2018 - 9:50:05 AM
Last modification on : Wednesday, November 25, 2020 - 8:48:04 AM

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A. Jackura, C. Fernández-Ramírez, A. Pilloni, V. Mathieu, J. Nys, et al.. New analysis of $\eta\pi$ tensor resonances measured at the COMPASS experiment. Phys.Lett.B, 2018, 779, pp.464-472. ⟨10.1016/j.physletb.2018.01.017⟩. ⟨hal-01757858⟩

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