Transverse beam polarization and CP-violating triple-gauge-boson couplings in e+e- -> gamma Z

Details Transverse beam polarization and CP-violating triple-gauge-boson couplings in e+e- -> gamma Z Transverse beam polarization and CP-violating triple-gauge-boson couplings in e+e- -> gamma Z

2004-04-13

arxiv.org/abs/hep-ph/0404106v1

Phys.Lett. B593 (2004) 95-104; Erratum-ibid. B608 (2005) 274-275

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, latex, 7 figures included as postscript

Scientific paper

10.1016/j.physletb.2004.04.067

We show that an anomalous CP-violating gamma-gamma-Z vertex gives rise to a novel asymmetry with transversely polarized electron and positron beams in the process e+e- -> gamma Z. This asymmetry, which is odd under naive time reversal, is proportional to the real part of the gamma-gamma-Z CP-violating coupling. This is in contrast to the simple forward-backward asymmetry of the gamma (or Z) with unpolarized or longitudinally polarized beams studied earlier, which is even under naive time reversal, and is proportional to the imaginary part. We estimate the sensitivity of future experiments to the determination of CP-odd gamma-gamma-Z and gamma-Z-Z couplings using these asymmetries and transversely polarized beams.

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