Eur. Phys. J. A (2014) 50: 98
https://doi.org/10.1140/epja/i2014-14098-5

Regular Article - Experimental Physics

The study of the proton-proton collisions at the beam momentum 1581 MeV/c

¹ Petersburg Nuclear Physics Institute NRC KI, 188300, Gatchina, Russia
² Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany

^* e-mail: saran@pnpi.spb.ru

Received: 10 February 2014
Revised: 9 May 2014
Accepted: 15 May 2014
Published online: 13 June 2014

Abstract

The new data on the elastic pp and single-pion production reaction pp → pnπ ⁺ taken at the incident proton momentum 1581 MeV/c are presented. To extract contributions of the leading partial waves the single-pion production data are analyzed in the framework of the event-by-event maximum-likelihood method together with pp → ppπ ⁺ data measured earlier and the pp → pnπ ⁺ data taken at 1628 MeV/c. The analysis shows that at 1581 MeV/c the largest contributions stem from the ³ P ₂, ³ P ₁, ³ P ₀ and ³ F ₂ initial partial waves. From these partial waves we also deduce contributions for the production of the Δ(1232) and N(1440) states.