ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?

P. Adlarson , C. Adolph , W. Augustyniak , V. Baru , M. Bashkanov , F.S. Bergmann , M. Berlowski , H. Bhatt

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K.-T. Brinkmann M. Buescher H. Calen H. Clement D. Coderre E. Czerwinski E. Doroshkevich C. Ekstrom R. Engels W. Erven W. Eyrich P. Fedorets K. Foehl K. Fransson F. Goldenbaum P. Goslawski K. Grigoryev V. Grishina C.-O. Gullstrom J. Hampe C. Hanhart L. Heijkenskj V. Hejny F. Hinterberger M. Hodana B. Hoistad M. Jacewicz M. Janusz A. Jany B.R. Jany L. Jarczyk J. Jaus T. Johansson B. Kamys G. Kemmerling O. Khakimova A. Khoukaz S. Kistryn J. Klaja H. Kleines B. Klos F. Kren W. Krzemien P. Kulessa S. Kullander A. Kupsc K. Lalwani B. Lorentz A. Magiera R. Maier P. Marciniewski B. Marianski M. Mikirtychiants P. Moskal H.-P. Morsch B.K. Nandi H. Ohm A. Passfeld C. Pauly E. Perez del Rio Y. Petukhov N. Piskunov P. Plucinski P. Podkopal A. Povtoreyko D. Prasuhn A. Pricking K. Pysz T. Rausmann C.F. Redmer J. Ritman A. Roy R.J.M.Y. Ruber Z. Rudy S. Schadmand A. Schmidt W. Schroeder T. Sefzick V. Serdyuk N. Shah M. Siemaszko R. Siudak T. Skorodko M. Skurzok J. Smyrski V. Sopov R. Stassen J. Stepaniak G. Sterzenbach H. Stockhorst H. Stroeher A. Szczurek A. Taeschner T. Tolba A. Trzcinski R. Varma P. Vlasov G.J. Wagner W. Weglorz A. Winnemoeller A. Wirzba M. Wolke A. Wronska P. Wuestner P. Wurm L. Yurev J. Zabierowski M.J. Zielinski W. Zipper J. Zlomanczuk P. Zupranski

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keywords effectresonancebasicdeltaenergyfusionassociatedconsistent

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We report on a high-statistics measurement of the basic double pionic fusion reaction $pn \to d\pi^0\pi^0$ over the energy region of the so-called ABC effect, a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The measurements were performed with the WASA detector setup at COSY. The data reveal the ABC effect to be associated with a Lorentzian shaped energy dependence in the integral cross section. The observables are consistent with a resonance with $I(J^P) =0(3^+)$ in both $pn$ and $\Delta\Delta$ systems. Necessary further tests of the resonance interpretation are discussed.

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ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?

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