Impact of $e^+$ and $e^-$ beam polarization on chargino and neutralino production at a linear collider

G. Moortgat-Pick; A. Bartl; H. Fraas; W. Majerotto

doi:doi:10.1007/s100520000501

EPJ

Impact of e⁺ and e^- beam polarization on chargino
and neutralino production at a linear collider

G. Moortgat-Pick¹ - A. Bartl² - H. Fraas³ - W. Majerotto⁴

¹ DESY, Deutsches Elektronen-Synchrotron, 22603 Hamburg, Germany
² Institut für Theoretische Physik, Universität Wien, 1090 Wien, Austria
³ Institut für Theoretische Physik, Universität Würzburg, 97074 Würzburg, Germany
⁴ Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften, 1050 Wien, Austria

Abstract
We study the production processes $e^+ e^-\to \tilde{\chi}^+_i \tilde{\chi}^-_j$ , i,j=1,2, and $e^+ e^-\to \tilde{\chi}^0_m \tilde{\chi}^0_n, m,n=$
$1,\ldots,4$ , working out the advantages of polarizing both beams. For $e^+ e^-\to \tilde{\chi}^+_1 \tilde{\chi}^-_1$ with $\tilde{\chi}^-_1\to \tilde{\chi}^0_1 e^- \bar{\nu}$ and $e^+ e^-\to \tilde{\chi}^0_1 \tilde{\chi}^0_2$ with $\tilde{\chi}^0_2 \to \tilde{\chi}^0_1 e^+ e^-$ we perform a detailed analysis, including the complete spin correlations between production and decay. We analyze the forward-backward asymmetry of the decay electron for various beam polarizations. We also study polarization asymmetries in $e^+ e^-\to \tilde{\chi}^0_1 \tilde{\chi}^0_2$ . These asymmetries strongly constrain the gaugino parameter M₁ and the masses $m_{\tilde{e}_{\mathrm {L}}}$ , $m_{\tilde{e}_{\mathrm {R}}}$ , $m_{\tilde{\nu}}$ also if $m_{\tilde{e},\tilde{\nu}}\ge s^{1/2}/2$ . We give numerical predictions for three scenarios for a linear collider with s^1/2=500-1000GeV.

Student Conference in Optics and Photonics 2024
October 2-4, 2024
Barcelona, Spain

EPJ

Impact of e+ and e- beam polarization on chargino and neutralino production at a linear collider

Conference announcements

Impact of e⁺ and e^- beam polarization on chargino
and neutralino production at a linear collider