\pi^0 \pi^0 Production in Proton-Proton Collisions at Tp=1.4 GeV

P. Adlarson; C. Adolph; W. Augustyniak; M. Bashkanov; T. Bednarski,; F.S. Bergmann; M. Ber{\l}owski; H. Bhatt; K.--T. Brinkmann; M. B\"uscher; H.; Cal\'en; H. Clement; D. Coderre; E. Czerwi\'nski; E. Doroshkevich; R. Engels,; W. Erven; W. Eyrich; P. Fedorets; K. F\"ohl; K. Fransson; F. Goldenbaum; P.; Goslawski; K. Grigoryevj; C.--O. Gullstr\"om; L. Heijkenskj\"old; J.; Heimlich; V. Hejny; F. Hinterberger; M. Hodana; B. H\"oistad; M. Jacewicz; M.; Janusz; A. Jany; B.R. Jany; L. Jarczyk; T. Johansson; B. Kamys; G.; Kemmerling; O. Khakimova; A. Khoukaz; S. Kistryn; J. Klaja; H. Kleines; B.; K{\l}os; F. Kren; W. Krzemie\'n; P. Kulessa; A. Kup\'s\'c; K. Lalwani; B.; Lorentz; H. Machner; A. Magiera; R. Maier; B. Maria\'nski; P. Marciniewski,; M. Mikirtychiants; H.--P. Morsch; P. Moskal; B.K. Nandi; S. Nied\'zwiecki; H.; Ohm; A. Passfeld; C. Pauly; E. Perez del Rio; Y. Petukhov; N. Piskunov; P.; Pluci\'nski; P. Podkopa{\l}; A. Povtoreyko; D. Prasuhn; A. Pricking; K. Pysz,; T. Rausmann; C.F. Redmer; J. Ritman; Z. Rudy; S. Sawant; S. Schadmand; A.; Schmidt; T. Sefzick; V. Serdyuk; N. Shah; M. Siemaszko; T. Skorodko; M.; Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; G. Sterzenbach; H.; Stockhorst; A. Szczurek; A. T\"aschner; T. Tolba; A. Trzci\'nski; R. Varma,; P. Vlasov; G.J. Wagner; W. Weglorz; U. Wiedner; A. Winnem\"oller; M. Wolke,; A. Wro\'nska; P. W\"ustner; P. Wurm; X. Yuan; L. Yurev; J. Zabierowski; C.; Zheng; M.J. Zieli\'nski; W. Zipper; J. Z{\l}oma\'nczuk; P. Zupra\'nski

arXiv:1107.0879·hep-ex·May 28, 2015

\pi^0 \pi^0 Production in Proton-Proton Collisions at Tp=1.4 GeV

P. Adlarson, C. Adolph, W. Augustyniak, M. Bashkanov, T. Bednarski,, F.S. Bergmann, M. Ber{\l}owski, H. Bhatt, K.--T. Brinkmann, M. B\"uscher, H., Cal\'en, H. Clement, D. Coderre, E. Czerwi\'nski, E. Doroshkevich, R. Engels,, W. Erven, W. Eyrich, P. Fedorets, K. F\"ohl

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TL;DR

This study investigates neutral pion pair production in proton-proton collisions at 1.4 GeV, revealing that the process predominantly involves Delta(1232) resonances with no significant Roper resonance contribution.

Contribution

First detailed measurement of pp->pppi0pi0 at 1.4 GeV, showing the dominance of Delta(1232) resonances in the production mechanism.

Findings

01

Total cross section measured as 324 ± 21 (systematic) ± 58 (normalization) μb.

02

Differential distributions indicate excitation of initial protons into Delta(1232) resonances.

03

No significant contribution from Roper resonance N*(1440).

Abstract

The reaction pp->pppi0pi0 has been investigated at a beam energy of 1.4 GeV using the WASA-at-COSY facility. The total cross section is found to be (324 +- 21_systematic +- 58_normalization) mub. In order to to study the production mechanism, differential kinematical distributions have been evaluated. The differential distributions indicate that both initial state protons are excited into intermediate Delta(1232) resonances, each decaying into a proton and a single pion, thereby producing the pion pair in the final state. No significant contribution of the Roper resonance N*(1440) via its decay into a proton and two pions is found

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