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

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The European Physical Journal C - Particles and Fields Aims and scope Submit manuscript

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 \(M_1\) and the masses \(m_{\tildee_{\mathrm{L}}}\), \(m_{\tildee_{\mathrm{R}}}\), \(m_{\tilde{\nu}}\) also if \(m_{\tildee,\tilde{\nu}}\ge s^{1/2}/2\). We give numerical predictions for three scenarios for a linear collider with \(s^{1/2}=500\)–1000 GeV.

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Received: 20 July 2000 / Published online: 27 November 2000

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Moortgat-Pick, G., Bartl, A., Fraas, H. et al. Impact of \(e^+\) and \(e^-\) beam polarization on chargino and neutralino production at a linear collider. Eur. Phys. J. C 18, 379–391 (2000). https://doi.org/10.1007/s100520000501

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  • DOI: https://doi.org/10.1007/s100520000501

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