Revision of absorption corrections for the $pp\to pp{\pi }^{+}{\pi }^{-}$ process

Abstract

We include new additional absorption corrections into the Lebiedowicz-Szczurek (non-resonant) model for $pp\to pp{\pi }^{+}{\pi }^{-}$ or $p\bar{p}\to p\bar{p}{\pi }^{+}{\pi }^{-}$ processes. They are related to the $\pi N$ nonperturbative interaction in the final state of the reaction. The role of the absorption corrections is quantified for several differential distributions for $\sqrt{s}$ = 0.2, 1.96, 7, and 8 TeV. The new absorption corrections lead to further decrease of the cross section by about a factor of two. They change the shape of some distributions ($d\sigma /dt$, $d\sigma /d{p}_{t,p}$, $d\sigma /d{\varphi }_{pp}$) but leave almost unchanged shape of other distributions ($d\sigma /d{M}_{\pi \pi }$, $d\sigma /d{y}_{\pi }$, $d\sigma /d{p}_{t,\pi }$, $d\sigma /d{\varphi }_{\pi \pi }$). The effect may have important impact on the interpretation of the recent STAR and CDF data as well as the forthcoming data of the ALICE, ATLAS + ALFA and CMS + TOTEM collaborations.

Comments: 24 pages, 15 figures, 1 table, some figures were removed, a discussion concerning large dipion transverse momenta and ISR data was added