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Title: Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies

Abstract

The main dynamical mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies, currently investigated at Serpukhov and Brookhaven, are considered in detail. It is shown that the observed forward peak in its differential cross section can be explained within the framework of the Regge pole model only by the conspiring {rho}{sub 2} Regge pole exchange. The tentative estimates of the absolute {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n reaction cross section at P{sub lab}{sup {pi}{sup {minus}}}=18 GeV/c are obtained: {sigma}{approx}200 nb and, in the forward direction, d{sigma}/dt{approx}940 nb/GeV{sup 2}. The contribution of the one pion exchange, which is forbidden by G parity and which can arise owing to the f{sub 0}{sup 0}(980){minus}a{sub 0}{sup 0}(980) mixing, is also estimated. The role of the Regge cuts in the nonflip helicity amplitude is briefly examined and the conclusion is made that the contributions of the cuts have to be inessential in comparison with the conspiring {rho}{sub 2} Regge pole exchange. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
;  [1]
  1. Laboratory of Theoretical Physics, S.L. Sobolev Institute for Mathematics, 630090, Novosibirsk 90 (Russia)
Publication Date:
OSTI Identifier:
531961
Resource Type:
Journal Article
Journal Name:
Physical Review, D
Additional Journal Information:
Journal Volume: 56; Journal Issue: 1; Other Information: PBD: Jul 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; PION MINUS-PROTON INTERACTIONS; A0-980 MESONS; NEUTRONS; PION-PROTON INTERACTIONS; P INVARIANCE; PIONS NEUTRAL; ETA MESONS; DIFFERENTIAL CROSS SECTIONS; REGGE POLES; G PARITY

Citation Formats

Achasov, N N, and Shestakov, G N. Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies. United States: N. p., 1997. Web. doi:10.1103/PhysRevD.56.212.
Achasov, N N, & Shestakov, G N. Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies. United States. https://doi.org/10.1103/PhysRevD.56.212
Achasov, N N, and Shestakov, G N. Tue . "Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies". United States. https://doi.org/10.1103/PhysRevD.56.212.
@article{osti_531961,
title = {Mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies},
author = {Achasov, N N and Shestakov, G N},
abstractNote = {The main dynamical mechanisms of the reaction {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n at high energies, currently investigated at Serpukhov and Brookhaven, are considered in detail. It is shown that the observed forward peak in its differential cross section can be explained within the framework of the Regge pole model only by the conspiring {rho}{sub 2} Regge pole exchange. The tentative estimates of the absolute {pi}{sup {minus}}p{r_arrow}a{sub 0}{sup 0}(980)n{r_arrow}{pi}{sup 0}{eta}n reaction cross section at P{sub lab}{sup {pi}{sup {minus}}}=18 GeV/c are obtained: {sigma}{approx}200 nb and, in the forward direction, d{sigma}/dt{approx}940 nb/GeV{sup 2}. The contribution of the one pion exchange, which is forbidden by G parity and which can arise owing to the f{sub 0}{sup 0}(980){minus}a{sub 0}{sup 0}(980) mixing, is also estimated. The role of the Regge cuts in the nonflip helicity amplitude is briefly examined and the conclusion is made that the contributions of the cuts have to be inessential in comparison with the conspiring {rho}{sub 2} Regge pole exchange. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevD.56.212},
url = {https://www.osti.gov/biblio/531961}, journal = {Physical Review, D},
number = 1,
volume = 56,
place = {United States},
year = {1997},
month = {7}
}