<i>CP</i> asymmetries in neutralino production in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup></mrow><mrow><msup><mrow><mi>e</mi></mrow><mrow><mi>−</mi></mrow></msup></mrow></math></span> collisions

A. Bartl; H. Fraas; O. Kittel; W. Majerotto

doi:10.1103/PhysRevD.69.035007

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CP asymmetries in neutralino production in $e^{+} e^{-}$ collisions

A. Bartl^1,*, H. Fraas^2,†, O. Kittel^1,2,‡, and W. Majerotto^3,§

¹Institut für Theoretische Physik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria
²Institut für Theoretische Physik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
³Institut für Hochenergiephysik, Österreichische Akademie der Wissenschaften, Nikolsdorfergasse 18, A-1050 Wien, Austria

^*Email address: bartl@ap.univie.ac.at
^†Email address: fraas@physik.uni-wuerzburg.de
^‡Email address: kittel@physik.uni-wuerzburg.de
^§Email address: majer@qhepu3.oeaw.ac.at

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Phys. Rev. D 69, 035007 – Published 26 February, 2004

DOI: https://doi.org/10.1103/PhysRevD.69.035007

Abstract

We study two CP sensitive triple-product asymmetries for neutralino production $e^{+} e^{-} \to {\tilde{χ}}_{i}^{0} {\tilde{χ}}_{j}^{0}$ and the subsequent leptonic two-body decay ${\tilde{χ}}_{i}^{0} \to l ̃ l,$ $l ̃$ $\to {\tilde{χ}}_{1}^{0} l,$ for $l = e, μ, τ .$ We calculate the asymmetries, cross sections and branching ratios in the minimal supersymmetric standard model with complex parameters $μ$ and $M_{1} .$ We present numerical results for the asymmetries to be expected at a linear electron-positron collider in the 500 GeV range. The asymmetries can go up to 25%. We estimate the event rates which are necessary to observe the asymmetries. Polarized electron and positron beams can significantly enhance the asymmetries and cross sections. In addition, we show how the two decay leptons can be distinguished by making use of their energy distributions.

References (15)

H.E. Haber and G.L. Kane, Phys. Rep. 117, 75 (1985).
TESLA Technical Design Report, Part III, Physics at an $e^{+} e^{-}$ Linear Collider, edited by R.-D. Heuer, D. Miller, F. Richard, and P. Zerwas, hep-ph/0106315.
S.Y. Choi, H.S. Song, and W.Y. Song, Phys. Rev. D 61, 075004 (2000).
S.Y. Choi, J. Kalinowski, G. Moortgat-Pick, and P.M. Zerwas, Eur. Phys. J. C 22, 563 (2001); ibid.23, 769 (2001); S.Y. Choi, hep-ph/0308060.
G. Moortgat-Pick, H. Fraas, A. Bartl, and W. Majerotto, Eur. Phys. J. C 9, 521 (1999); ibid.9, 549(E) (1999).
J.F. Donoghue, Phys. Rev. D 18, 1632 (1978).
Y. Kizukuri and N. Oshimo, Phys. Lett. B 249, 449 (1990).
G. Valencia, hep-ph/9411441.
A. Bartl, H. Fraas, T. Kernreiter, and O. Kittel, hep-ph/0306304.
H.E. Haber, in Proceedings of the 21st SLAC Summer Institute on Particle Physics, edited by L. DeProcel and Ch. Dunwoodie, Stanford, 1993, p. 231.
A. Bartl, K. Hidaka, T. Kernreiter, and W. Porod, Phys. Rev. D 66, 115009 (2002).
L.J. Hall and J. Polchinski, Phys. Lett. 152B, 335 (1985).
S.T. Petcov, Phys. Lett. 139B, 421 (1984); G. Moortgat-Pick and H. Fraas, Eur. Phys. J. C 25, 189 (2002).
I.S. Altarev et al., Phys. Lett. B 276, 242 (1992); I.S. AltarevPhys. At. Nucl. 59, 1152 (1996); Yad. Fiz. 59, no. 7 (1996); E.D. Commins, S.B. Ross, D. DeMille, and B.C. Regan, Phys. Rev. A 50, 2960 (1994).
P. Nath, talk at the 9th International Conference on Supersymmetry and Unification of Fundamental Interactions, 2001, Dubna, hep-ph/0107325, and references therein.

[c1] H.E. Haber and G.L. Kane, Phys. Rep. 117, 75 (1985).

[c2] TESLA Technical Design Report, Part III, Physics at an $e^{+} e^{-}$ Linear Collider, edited by R.-D. Heuer, D. Miller, F. Richard, and P. Zerwas, hep-ph/0106315.

[c3] S.Y. Choi, H.S. Song, and W.Y. Song, Phys. Rev. D 61, 075004 (2000).

[c4] S.Y. Choi, J. Kalinowski, G. Moortgat-Pick, and P.M. Zerwas, Eur. Phys. J. C 22, 563 (2001); ibid.23, 769 (2001); S.Y. Choi, hep-ph/0308060.

[c5] G. Moortgat-Pick, H. Fraas, A. Bartl, and W. Majerotto, Eur. Phys. J. C 9, 521 (1999); ibid.9, 549(E) (1999).

[c6] J.F. Donoghue, Phys. Rev. D 18, 1632 (1978).

[c7] Y. Kizukuri and N. Oshimo, Phys. Lett. B 249, 449 (1990).

[c8] G. Valencia, hep-ph/9411441.

[c9] A. Bartl, H. Fraas, T. Kernreiter, and O. Kittel, hep-ph/0306304.

[c10] H.E. Haber, in Proceedings of the 21st SLAC Summer Institute on Particle Physics, edited by L. DeProcel and Ch. Dunwoodie, Stanford, 1993, p. 231.

[c11] A. Bartl, K. Hidaka, T. Kernreiter, and W. Porod, Phys. Rev. D 66, 115009 (2002).

[c12] L.J. Hall and J. Polchinski, Phys. Lett. 152B, 335 (1985).

[c13] S.T. Petcov, Phys. Lett. 139B, 421 (1984); G. Moortgat-Pick and H. Fraas, Eur. Phys. J. C 25, 189 (2002).

[c14] I.S. Altarev et al., Phys. Lett. B 276, 242 (1992); I.S. AltarevPhys. At. Nucl. 59, 1152 (1996); Yad. Fiz. 59, no. 7 (1996); E.D. Commins, S.B. Ross, D. DeMille, and B.C. Regan, Phys. Rev. A 50, 2960 (1994).

[c15] P. Nath, talk at the 9th International Conference on Supersymmetry and Unification of Fundamental Interactions, 2001, Dubna, hep-ph/0107325, and references therein.

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CP asymmetries in neutralino production in $e^{+} e^{-}$ collisions

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CP asymmetries in neutralino production in $e^{+} e^{-}$ collisions