Charge “asymmetry” from the isospin symmetry in

I. Seluzhenkov; M. Schepkin; H. Clement

doi:10.1140/epja/i2002-10226-2

EPJ

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2024 Impact factor 2.8

Hadrons and Nuclei

Eur. Phys. J. A (2003) 18: 321-322
https://doi.org/10.1140/epja/i2002-10226-2

Charge “asymmetry” from the isospin symmetry in $pp\to pp\pi^ + \pi^-$

I. Seluzhenkov¹^*, M. Schepkin¹ and H. Clement²

¹ Institute of Theoretical and Experimental Physics, B. Cheremushkinskaja 25, 117259, Moscow, Russia
² Physikalisches Institut der Universität Tübingen, Morgenstelle 14, D-72076, Tübingen, Germany

^* e-mail: seluzhen@heron.itep.ru

Abstract

Charge “asymmetry” meant as $\sigma_{ + -} = {\mathrm d} \sigma/{\mathrm d} M_{p\pi^ + }- {\mathrm d} \sigma/{\mathrm d} M_{p\pi^-}$ is easy to reproduce by the simple-minded reaction mechanism, which stems on the interference of $\Delta^{ + + }$ and $\Delta^{0}$ excited in one of the colliding protons. High-quality experimental data for the $pp\to pp\pi^ + \pi^-$ reaction taken at CELSIUS storage ring with the PROMICE/WASA detector can be described by the Lorentz-invariant phenomenological approach. The same approach is applied for the description of the asymmetry between $M_{pp\pi^ + }$ and $M_{pp\pi^-}$ invariant-mass spectra.

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